Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit

We report the discovery and confirmation of TOI-4465 b, a 1.25 R _J ${}_{-0.07{R}_{{\rm{J}}}}^{+0.08{R}_{{\rm{J}}}}$ , 5.89 M _J  ± 0.26 M _J giant planet orbiting a G dwarf star at d  ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Transiting Exoplanet Surv...

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Main Authors: Zahra Essack, Diana Dragomir, Paul A. Dalba, Matthew P. Battley, David R. Ciardi, Karen A. Collins, Steve B. Howell, Matias I. Jones, Stephen R. Kane, Eric E. Mamajek, Christopher R. Mann, Ismael Mireles, Dominic Oddo, Lauren A. Sgro, Keivan G. Stassun, Solene Ulmer-Moll, Cristilyn N. Watkins, Samuel W. Yee, Carl Ziegler, Allyson Bieryla, Ioannis Apergis, Khalid Barkaoui, Rafael Brahm, Edward M. Bryant, Thomas M. Esposito, Pedro Figueira, Benjamin J. Fulton, Samuel Gill, Andrew W. Howard, Howard Isaacson, Alicia Kendall, Nicholas Law, Michael B. Lund, Andrew W. Mann, Rachel A. Matson, Felipe Murgas, Enric Palle, Samuel N. Quinn, Alexandre Revol, Suman Saha, Richard P. Schwarz, Ramotholo Sefako, Avi Shporer, Ivan A. Strakhov, Steven Villanueva Jr., George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Pau Bosch-Cabot, Kevin I. Collins, Raquel Forés-Toribio, Fabian Rodriguez Frustagia, Eric Girardin, Ian J. Helm, Pablo Lewin, Jose A. Muñoz, Patrick Newman, Peter Plavchan, Gregor Srdoc, Chris Stockdale, Anaël Wünsche, Mario Billiani, Martin Davy, Alex Douvas, Keiichi Fukui, Bruno Guillet, Cory Ostrem, Michael Rushton, Angsar Schmidt, Andrea Finardi, Patrice Girard, Tateki Goto, Julien S. de Lambilly, Liouba Leroux, Fabrice Mortecrette, John W. Pickering, Michael Primm, Marc Ribot, Ethan Teng, Aad Verveen, Stefan Will, Mark Ziegler
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Published: IOP Publishing 2025-01-01
Series:The Astronomical Journal
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Online Access:https://doi.org/10.3847/1538-3881/add88b
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_version_ 1850158019604643840
author Zahra Essack
Diana Dragomir
Paul A. Dalba
Matthew P. Battley
David R. Ciardi
Karen A. Collins
Steve B. Howell
Matias I. Jones
Stephen R. Kane
Eric E. Mamajek
Christopher R. Mann
Ismael Mireles
Dominic Oddo
Lauren A. Sgro
Keivan G. Stassun
Solene Ulmer-Moll
Cristilyn N. Watkins
Samuel W. Yee
Carl Ziegler
Allyson Bieryla
Ioannis Apergis
Khalid Barkaoui
Rafael Brahm
Edward M. Bryant
Thomas M. Esposito
Pedro Figueira
Benjamin J. Fulton
Samuel Gill
Andrew W. Howard
Howard Isaacson
Alicia Kendall
Nicholas Law
Michael B. Lund
Andrew W. Mann
Rachel A. Matson
Felipe Murgas
Enric Palle
Samuel N. Quinn
Alexandre Revol
Suman Saha
Richard P. Schwarz
Ramotholo Sefako
Avi Shporer
Ivan A. Strakhov
Steven Villanueva Jr.
George R. Ricker
Roland Vanderspek
David W. Latham
Sara Seager
Joshua N. Winn
Pau Bosch-Cabot
Kevin I. Collins
Raquel Forés-Toribio
Fabian Rodriguez Frustagia
Eric Girardin
Ian J. Helm
Pablo Lewin
Jose A. Muñoz
Patrick Newman
Peter Plavchan
Gregor Srdoc
Chris Stockdale
Anaël Wünsche
Mario Billiani
Martin Davy
Alex Douvas
Keiichi Fukui
Bruno Guillet
Cory Ostrem
Michael Rushton
Angsar Schmidt
Andrea Finardi
Patrice Girard
Tateki Goto
Julien S. de Lambilly
Liouba Leroux
Fabrice Mortecrette
John W. Pickering
Michael Primm
Marc Ribot
Ethan Teng
Aad Verveen
Stefan Will
Mark Ziegler
author_facet Zahra Essack
Diana Dragomir
Paul A. Dalba
Matthew P. Battley
David R. Ciardi
Karen A. Collins
Steve B. Howell
Matias I. Jones
Stephen R. Kane
Eric E. Mamajek
Christopher R. Mann
Ismael Mireles
Dominic Oddo
Lauren A. Sgro
Keivan G. Stassun
Solene Ulmer-Moll
Cristilyn N. Watkins
Samuel W. Yee
Carl Ziegler
Allyson Bieryla
Ioannis Apergis
Khalid Barkaoui
Rafael Brahm
Edward M. Bryant
Thomas M. Esposito
Pedro Figueira
Benjamin J. Fulton
Samuel Gill
Andrew W. Howard
Howard Isaacson
Alicia Kendall
Nicholas Law
Michael B. Lund
Andrew W. Mann
Rachel A. Matson
Felipe Murgas
Enric Palle
Samuel N. Quinn
Alexandre Revol
Suman Saha
Richard P. Schwarz
Ramotholo Sefako
Avi Shporer
Ivan A. Strakhov
Steven Villanueva Jr.
George R. Ricker
Roland Vanderspek
David W. Latham
Sara Seager
Joshua N. Winn
Pau Bosch-Cabot
Kevin I. Collins
Raquel Forés-Toribio
Fabian Rodriguez Frustagia
Eric Girardin
Ian J. Helm
Pablo Lewin
Jose A. Muñoz
Patrick Newman
Peter Plavchan
Gregor Srdoc
Chris Stockdale
Anaël Wünsche
Mario Billiani
Martin Davy
Alex Douvas
Keiichi Fukui
Bruno Guillet
Cory Ostrem
Michael Rushton
Angsar Schmidt
Andrea Finardi
Patrice Girard
Tateki Goto
Julien S. de Lambilly
Liouba Leroux
Fabrice Mortecrette
John W. Pickering
Michael Primm
Marc Ribot
Ethan Teng
Aad Verveen
Stefan Will
Mark Ziegler
author_sort Zahra Essack
collection DOAJ
description We report the discovery and confirmation of TOI-4465 b, a 1.25 R _J ${}_{-0.07{R}_{{\rm{J}}}}^{+0.08{R}_{{\rm{J}}}}$ , 5.89 M _J  ± 0.26 M _J giant planet orbiting a G dwarf star at d  ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Transiting Exoplanet Survey Satellite (TESS) mission. Radial velocity (RV) observations of TOI-4465 showed a planetary signal with an orbital period of ∼102 days and an orbital eccentricity of e  = 0.24 ± 0.01. TESS reobserved TOI-4465 in Sector 53 and Sector 80 but did not detect another transit of TOI-4465 b, as the planet was not expected to transit during these observations based on the RV period. A global ground-based photometry campaign was initiated to observe another transit of TOI-4465 b after the RV period determination. The ∼12 hr long transit event was captured from multiple sites around the world and included observations from 24 citizen scientists, confirming the orbital period as ∼102 days. TOI-4465 b is a relatively dense (3.73 ± 0.53 g cm ^−3 ), temperate (375–478 K) giant planet. Based on giant planet structure models, TOI-4465 b appears to be enriched in heavy elements at a level consistent with late-stage accretion of icy planetesimals. Additionally, we explore TOI-4465 b’s potential for atmospheric characterization and obliquity measurement. Increasing the number of long-period planets by confirming single-transit events is crucial for understanding the frequency and demographics of planet populations in the outer regions of planetary systems.
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spelling doaj-art-18864b19baa342938e49fdee5d30cbed2025-08-20T02:24:00ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0117014110.3847/1538-3881/add88bGiant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS TransitZahra Essack0https://orcid.org/0000-0002-2482-0180Diana Dragomir1https://orcid.org/0000-0003-2313-467XPaul A. Dalba2https://orcid.org/0000-0002-4297-5506Matthew P. Battley3https://orcid.org/0000-0002-1357-9774David R. Ciardi4https://orcid.org/0000-0002-5741-3047Karen A. Collins5https://orcid.org/0000-0001-6588-9574Steve B. Howell6https://orcid.org/0000-0002-2532-2853Matias I. Jones7Stephen R. Kane8https://orcid.org/0000-0002-7084-0529Eric E. Mamajek9https://orcid.org/0000-0003-2008-1488Christopher R. Mann10https://orcid.org/0000-0002-9312-0073Ismael Mireles11https://orcid.org/0000-0002-4510-2268Dominic Oddo12https://orcid.org/0000-0002-2702-7700Lauren A. Sgro13https://orcid.org/0000-0001-6629-5399Keivan G. Stassun14https://orcid.org/0000-0002-3481-9052Solene Ulmer-Moll15https://orcid.org/0000-0003-2417-7006Cristilyn N. Watkins16https://orcid.org/0000-0001-8621-6731Samuel W. Yee17https://orcid.org/0000-0001-7961-3907Carl Ziegler18https://orcid.org/0000-0002-0619-7639Allyson Bieryla19https://orcid.org/0000-0001-6637-5401Ioannis Apergis20https://orcid.org/0009-0004-7473-4573Khalid Barkaoui21https://orcid.org/0000-0003-1464-9276Rafael Brahm22https://orcid.org/0000-0002-9158-7315Edward M. Bryant23https://orcid.org/0000-0001-7904-4441Thomas M. Esposito24https://orcid.org/0000-0002-0792-3719Pedro Figueira25https://orcid.org/0000-0001-8504-283XBenjamin J. Fulton26https://orcid.org/0000-0003-3504-5316Samuel Gill27https://orcid.org/0000-0002-4259-0155Andrew W. Howard28https://orcid.org/0000-0001-8638-0320Howard Isaacson29https://orcid.org/0000-0002-0531-1073Alicia Kendall30https://orcid.org/0009-0006-0719-9229Nicholas Law31https://orcid.org/0000-0001-9380-6457Michael B. Lund32https://orcid.org/0000-0003-2527-1598Andrew W. Mann33https://orcid.org/0000-0003-3654-1602Rachel A. Matson34https://orcid.org/0000-0001-7233-7508Felipe Murgas35https://orcid.org/0000-0001-9087-1245Enric Palle36https://orcid.org/0000-0003-0987-1593Samuel N. Quinn37https://orcid.org/0000-0002-8964-8377Alexandre Revol38https://orcid.org/0000-0002-3844-1747Suman Saha39https://orcid.org/0000-0001-8018-0264Richard P. Schwarz40https://orcid.org/0000-0001-8227-1020Ramotholo Sefako41https://orcid.org/0000-0003-3904-6754Avi Shporer42https://orcid.org/0000-0002-1836-3120Ivan A. Strakhov43https://orcid.org/0000-0003-0647-6133Steven Villanueva Jr.44https://orcid.org/0000-0001-6213-8804George R. Ricker45https://orcid.org/0000-0003-2058-6662Roland Vanderspek46https://orcid.org/0000-0001-6763-6562David W. Latham47https://orcid.org/0000-0001-9911-7388Sara Seager48https://orcid.org/0000-0002-6892-6948Joshua N. Winn49https://orcid.org/0000-0002-4265-047XPau Bosch-Cabot50https://orcid.org/0000-0002-1514-5558Kevin I. Collins51https://orcid.org/0000-0003-2781-3207Raquel Forés-Toribio52https://orcid.org/0000-0002-6482-2180Fabian Rodriguez Frustagia53Eric Girardin54https://orcid.org/0000-0002-5443-3640Ian J. Helm55https://orcid.org/0000-0002-0473-4437Pablo Lewin56https://orcid.org/0000-0003-0828-6368Jose A. Muñoz57https://orcid.org/0000-0001-9833-2959Patrick Newman58https://orcid.org/0000-0003-3848-3418Peter Plavchan59https://orcid.org/0000-0002-8864-1667Gregor Srdoc60Chris Stockdale61https://orcid.org/0000-0003-2163-1437Anaël Wünsche62https://orcid.org/0000-0002-6176-9847Mario Billiani63https://orcid.org/0000-0002-3278-9590Martin Davy64Alex Douvas65https://orcid.org/0009-0009-8377-0695Keiichi Fukui66https://orcid.org/0000-0002-9297-5133Bruno Guillet67https://orcid.org/0000-0003-4091-0247Cory Ostrem68Michael Rushton69Angsar Schmidt70Andrea Finardi71Patrice Girard72https://orcid.org/0009-0004-8835-6059Tateki Goto73https://orcid.org/0000-0002-9540-6112Julien S. de Lambilly74https://orcid.org/0000-0003-3464-1554Liouba Leroux75https://orcid.org/0000-0003-3046-9187Fabrice Mortecrette76https://orcid.org/0000-0002-6818-6599John W. Pickering77https://orcid.org/0000-0001-9475-0344Michael Primm78https://orcid.org/0000-0003-3462-7533Marc Ribot79Ethan Teng80Aad Verveen81Stefan Will82https://orcid.org/0000-0003-0404-6279Mark Ziegler83Department of Physics and Astronomy, The University of New Mexico , 210 Yale Blvd NE, Albuquerque, NM 87106, USA ; zessack@unm.eduDepartment of Physics and Astronomy, The University of New Mexico , 210 Yale Blvd NE, Albuquerque, NM 87106, USA ; zessack@unm.eduDepartment of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USAObservatoire Astronomique de l’Université de Genève , Chemin Pegasi 51, CH-1290 Versoix, SwitzerlandCaltech/IPAC-NASA Exoplanet Science Institute , 770 S. Wilson Avenue, Pasadena, CA 91106, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USANASA Ames Research Center , Moffett Field, CA 94035, USAEuropean Southern Observatory , Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, ChileDepartment of Earth and Planetary Sciences, University of California , Riverside, CA 92521, USAJet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Pasadena, CA 91109, USANational Research Council Canada, Herzberg Astronomy & Astrophysics Research Centre , 5071 West Saanich Road, Victoria, BC V9E 2E7, CanadaDepartment of Physics and Astronomy, The University of New Mexico , 210 Yale Blvd NE, Albuquerque, NM 87106, USA ; zessack@unm.eduDepartment of Physics and Astronomy, The University of New Mexico , 210 Yale Blvd NE, Albuquerque, NM 87106, USA ; zessack@unm.eduSETI Institute , Carl Sagan Center, 339 Bernardo Ave, Suite 200, Mountain View, CA 94043, USADepartment of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USAObservatoire Astronomique de l’Université de Genève , Chemin Pegasi 51, CH-1290 Versoix, Switzerland; Space Research and Planetary Sciences, Physics Institute, University of Bern , Gesellschaftsstrasse 6, 3012 Bern, SwitzerlandCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USADepartment of Physics, Engineering and Astronomy, Stephen F. Austin State University , 1936 North St., Nacogdoches, TX 75962, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USADepartment of Physics, University of Warwick , Gibbet Hill Road, Coventry CV 4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV 4 7AL, UKAstrobiology Research Unit, Université de Liège , 19C Allée du 6 Août, 4000 Liège, Belgium; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA; Instituto de Astrofísica de Canarias (IAC) , Calle Vía Láctea s/n, 38200, La Laguna, Tenerife, SpainFacultad de Ingeniera y Ciencias , Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics , Chile; Data Observatory Foundation , ChileMullard Space Science Laboratory, University College London , Holmbury St Mary, Dorking, Surrey RH5 6NT, UKSETI Institute , Carl Sagan Center, 339 Bernardo Ave, Suite 200, Mountain View, CA 94043, USA; Unistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, 13008, France; Department of Astronomy, University of California , Berkeley, CA 94720, USAObservatoire Astronomique de l’Université de Genève , Chemin Pegasi 51, CH-1290 Versoix, SwitzerlandNASA Exoplanet Science Institute/Caltech-IPAC , MC 314-6, 1200 E. California Blvd., Pasadena, CA 91125, USADepartment of Physics, University of Warwick , Gibbet Hill Road, Coventry CV 4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV 4 7AL, UKDepartment of Astronomy, California Institute of Technology , Pasadena, CA 91125, USADepartment of Astronomy, University of California Berkeley , Berkeley, CA 94720, USA; Centre for Astrophysics, University of Southern Queensland , Toowoomba, QLD, AustraliaSchool of Physics and Astronomy, University of Leicester , University Road, Leicester, LE1 7RH, UKDepartment of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599-3255, USACaltech/IPAC-NASA Exoplanet Science Institute , 770 S. Wilson Avenue, Pasadena, CA 91106, USADepartment of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599-3255, USAU.S. Naval Observatory , 3450 Massachusetts Avenue NW, Washington, DC 20392, USAInstituto de Astrofísica de Canarias (IAC) , 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL) , 38206, La Laguna, Tenerife, SpainInstituto de Astrofísica de Canarias (IAC) , 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL) , 38206, La Laguna, Tenerife, SpainCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAObservatoire Astronomique de l’Université de Genève , Chemin Pegasi 51, CH-1290 Versoix, SwitzerlandInstituto de Estudios Astrofísicos , Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile; Centro de Excelencia en Astrofísica y Tecnologías Afines (CATA) , Camino El Observatorio 1515, Las Condes, Santiago, ChileCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USASouth African Astronomical Observatory , P.O. Box 9, Observatory, Cape Town 7935, South AfricaDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USASternberg Astronomical Institute Lomonosov Moscow State University Universitetskii prospekt , 13, Moscow 119992, RussiaNASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USADepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USADepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USADepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USADepartment of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USAObservatori Astronòmic Albanyà , Camí de Bassegoda S/N, Albanyá 17733, Girona, Spain; University of Lethbridge , Lethbridge, AB, CanadaGeorge Mason University , 4400 University Dr., Fairfax, VA 22030, USADepartamento de Astronomía y Astrofísica , Universidad de Valencia, E-46100 Burjassot, Valencia, Spain; Observatorio Astronómico , Universidad de Valencia, E-46980 Paterna, Valencia, SpainAmerican Association of Variable Star Observers , 49 Bay State Road, Cambridge, MA 02138, USA; Frustaglia Private Observatory , SpainGrand-Pra Observatory , 1984 Les Hauderes, SwitzerlandGeorge Mason University , 4400 University Dr., Fairfax, VA 22030, USAThe Maury Lewin Astronomical Observatory , Glendora, CA 91741, USADepartamento de Astronomía y Astrofísica , Universidad de Valencia, E-46100 Burjassot, Valencia, Spain; Observatorio Astronómico , Universidad de Valencia, E-46980 Paterna, Valencia, SpainGeorge Mason University , 4400 University Dr., Fairfax, VA 22030, USAGeorge Mason University , 4400 University Dr., Fairfax, VA 22030, USAKotizarovci Observatory , Sarsoni 90, 51216 Viskovo, CroatiaHazelwood Observatory , AustraliaLaboratoire d’Astrophysique des Baronnies , Science Citoyenne et Actions pour la Nuit (LABSCAN), Moydans, FranceUnistellar Citizen Scientist , Vienna, AustriaUnistellar Citizen Scientist , Maxéville, FranceUnistellar Citizen Scientist , Temecula, CA, USAUnistellar Citizen Scientist , Tsuchiura, Ibaraki, JapanUnistellar Citizen Scientist , Puy-Saint-Vincent, FranceUnistellar Citizen Scientist , Ames, IA, USAUnistellar Citizen Scientist , Tonbridge, Kent, UKUnistellar Citizen Scientist , Archenhold Observatory, Finowfurt, Brandenburg, GermanyUnistellar Citizen Scientist , Valeggio sul Mincio, Verona, ItalyUnistellar Citizen Scientist , Bayonne, FranceUnistellar Citizen Scientist , Tonosyo, Kagawa, JapanUnistellar Citizen Scientist , Renens, Vaud, SwitzerlandUnistellar Citizen Scientist , Lattes, FranceUnistellar Citizen Scientist , Normandie, FranceUnistellar Citizen Scientist , Christchurch, New ZealandUnistellar Citizen Scientist , Austin, TX, USAUnistellar Citizen Scientist , Saint Paul les Dax, FranceUnistellar Citizen Scientist , Oakland, CA, USAUnistellar Citizen Scientist , Laren, Gelderland, The NetherlandsUnistellar Citizen Scientist , Raleigh, NC, USAUnistellar Citizen Scientist , Longmont, CO, USAWe report the discovery and confirmation of TOI-4465 b, a 1.25 R _J ${}_{-0.07{R}_{{\rm{J}}}}^{+0.08{R}_{{\rm{J}}}}$ , 5.89 M _J  ± 0.26 M _J giant planet orbiting a G dwarf star at d  ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Transiting Exoplanet Survey Satellite (TESS) mission. Radial velocity (RV) observations of TOI-4465 showed a planetary signal with an orbital period of ∼102 days and an orbital eccentricity of e  = 0.24 ± 0.01. TESS reobserved TOI-4465 in Sector 53 and Sector 80 but did not detect another transit of TOI-4465 b, as the planet was not expected to transit during these observations based on the RV period. A global ground-based photometry campaign was initiated to observe another transit of TOI-4465 b after the RV period determination. The ∼12 hr long transit event was captured from multiple sites around the world and included observations from 24 citizen scientists, confirming the orbital period as ∼102 days. TOI-4465 b is a relatively dense (3.73 ± 0.53 g cm ^−3 ), temperate (375–478 K) giant planet. Based on giant planet structure models, TOI-4465 b appears to be enriched in heavy elements at a level consistent with late-stage accretion of icy planetesimals. Additionally, we explore TOI-4465 b’s potential for atmospheric characterization and obliquity measurement. Increasing the number of long-period planets by confirming single-transit events is crucial for understanding the frequency and demographics of planet populations in the outer regions of planetary systems.https://doi.org/10.3847/1538-3881/add88bExoplanetsRadial velocityTransit photometryPlanetary system formation
spellingShingle Zahra Essack
Diana Dragomir
Paul A. Dalba
Matthew P. Battley
David R. Ciardi
Karen A. Collins
Steve B. Howell
Matias I. Jones
Stephen R. Kane
Eric E. Mamajek
Christopher R. Mann
Ismael Mireles
Dominic Oddo
Lauren A. Sgro
Keivan G. Stassun
Solene Ulmer-Moll
Cristilyn N. Watkins
Samuel W. Yee
Carl Ziegler
Allyson Bieryla
Ioannis Apergis
Khalid Barkaoui
Rafael Brahm
Edward M. Bryant
Thomas M. Esposito
Pedro Figueira
Benjamin J. Fulton
Samuel Gill
Andrew W. Howard
Howard Isaacson
Alicia Kendall
Nicholas Law
Michael B. Lund
Andrew W. Mann
Rachel A. Matson
Felipe Murgas
Enric Palle
Samuel N. Quinn
Alexandre Revol
Suman Saha
Richard P. Schwarz
Ramotholo Sefako
Avi Shporer
Ivan A. Strakhov
Steven Villanueva Jr.
George R. Ricker
Roland Vanderspek
David W. Latham
Sara Seager
Joshua N. Winn
Pau Bosch-Cabot
Kevin I. Collins
Raquel Forés-Toribio
Fabian Rodriguez Frustagia
Eric Girardin
Ian J. Helm
Pablo Lewin
Jose A. Muñoz
Patrick Newman
Peter Plavchan
Gregor Srdoc
Chris Stockdale
Anaël Wünsche
Mario Billiani
Martin Davy
Alex Douvas
Keiichi Fukui
Bruno Guillet
Cory Ostrem
Michael Rushton
Angsar Schmidt
Andrea Finardi
Patrice Girard
Tateki Goto
Julien S. de Lambilly
Liouba Leroux
Fabrice Mortecrette
John W. Pickering
Michael Primm
Marc Ribot
Ethan Teng
Aad Verveen
Stefan Will
Mark Ziegler
Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
The Astronomical Journal
Exoplanets
Radial velocity
Transit photometry
Planetary system formation
title Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
title_full Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
title_fullStr Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
title_full_unstemmed Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
title_short Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit
title_sort giant outer transiting exoplanet mass got em survey vi confirmation of a long period giant planet discovered with a single tess transit
topic Exoplanets
Radial velocity
Transit photometry
Planetary system formation
url https://doi.org/10.3847/1538-3881/add88b
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AT matthewpbattley giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT davidrciardi giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT karenacollins giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT stevebhowell giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT matiasijones giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT stephenrkane giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ericemamajek giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT christopherrmann giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ismaelmireles giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT dominicoddo giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT laurenasgro giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT keivangstassun giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT soleneulmermoll giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT cristilynnwatkins giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT samuelwyee giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT carlziegler giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT allysonbieryla giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ioannisapergis giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT khalidbarkaoui giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT rafaelbrahm giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT edwardmbryant giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT thomasmesposito giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT pedrofigueira giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT benjaminjfulton giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT samuelgill giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT andrewwhoward giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT howardisaacson giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT aliciakendall giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT nicholaslaw giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT michaelblund giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT andrewwmann giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT rachelamatson giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT felipemurgas giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT enricpalle giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT samuelnquinn giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT alexandrerevol giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT sumansaha giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT richardpschwarz giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ramotholosefako giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT avishporer giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ivanastrakhov giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT stevenvillanuevajr giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT georgerricker giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT rolandvanderspek giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT davidwlatham giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT saraseager giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT joshuanwinn giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT pauboschcabot giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT kevinicollins giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT raquelforestoribio giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT fabianrodriguezfrustagia giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ericgirardin giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ianjhelm giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT pablolewin giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT joseamunoz giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT patricknewman giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT peterplavchan giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT gregorsrdoc giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT chrisstockdale giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT anaelwunsche giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT mariobilliani giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT martindavy giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT alexdouvas giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT keiichifukui giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT brunoguillet giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT coryostrem giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT michaelrushton giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT angsarschmidt giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT andreafinardi giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT patricegirard giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT tatekigoto giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT juliensdelambilly giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT lioubaleroux giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT fabricemortecrette giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT johnwpickering giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT michaelprimm giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT marcribot giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT ethanteng giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT aadverveen giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT stefanwill giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit
AT markziegler giantoutertransitingexoplanetmassgotemsurveyviconfirmationofalongperiodgiantplanetdiscoveredwithasingletesstransit