Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581
We report the validation of multiple planets transiting the nearby ( d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b ( ${R}_{p}={0.956}_{-0.061}^{+0.063}\...
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| author | Michelle Kunimoto Zifan Lin Sarah Millholland Alexander Venner Natalie R. Hinkel Avi Shporer Andrew Vanderburg Jeremy Bailey Rafael Brahm Jennifer A. Burt R. Paul Butler Brad Carter David R. Ciardi Karen A. Collins Kevin I. Collins Knicole D. Colón Jeffrey D. Crane Tansu Daylan Matías R. Díaz John P. Doty Fabo Feng Eike W. Guenther Jonathan Horner Steve B. Howell Jan Janik Hugh R. A. Jones Petr Kabáth Shubham Kanodia Colin Littlefield Hugh P. Osborn Simon O’Toole Martin Paegert Pavel Pintr Richard P. Schwarz Steve Shectman Gregor Srdoc Keivan G. Stassun Johanna K. Teske Joseph D. Twicken Leonardo Vanzi Sharon X. Wang Robert A. Wittenmyer Jon M. Jenkins George R. Ricker Sara Seager Joshua Winn |
| author_facet | Michelle Kunimoto Zifan Lin Sarah Millholland Alexander Venner Natalie R. Hinkel Avi Shporer Andrew Vanderburg Jeremy Bailey Rafael Brahm Jennifer A. Burt R. Paul Butler Brad Carter David R. Ciardi Karen A. Collins Kevin I. Collins Knicole D. Colón Jeffrey D. Crane Tansu Daylan Matías R. Díaz John P. Doty Fabo Feng Eike W. Guenther Jonathan Horner Steve B. Howell Jan Janik Hugh R. A. Jones Petr Kabáth Shubham Kanodia Colin Littlefield Hugh P. Osborn Simon O’Toole Martin Paegert Pavel Pintr Richard P. Schwarz Steve Shectman Gregor Srdoc Keivan G. Stassun Johanna K. Teske Joseph D. Twicken Leonardo Vanzi Sharon X. Wang Robert A. Wittenmyer Jon M. Jenkins George R. Ricker Sara Seager Joshua Winn |
| author_sort | Michelle Kunimoto |
| collection | DOAJ |
| description | We report the validation of multiple planets transiting the nearby ( d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b ( ${R}_{p}={0.956}_{-0.061}^{+0.063}\,{R}_{\oplus }$ , P = 4.47 days) and HD 101581c ( ${R}_{p}={0.990}_{-0.070}^{+0.070}\,{R}_{\oplus }$ , P = 6.21 days). Both planets were discovered in Sectors 63 and 64 TESS observations and statistically validated with supporting ground-based follow-up. We also identify a signal that probably originates from a third transiting planet, TOI-6276.03 ( ${R}_{p}={0.982}_{-0.098}^{+0.114}\,{R}_{\oplus }$ , P = 7.87 days). These planets are remarkably uniform in size and their orbits are evenly spaced, representing a prime example of the “peas-in-a-pod” architecture seen in other compact multiplanet systems. At V = 7.77, HD 101581 is the brightest star known to host multiple transiting planets smaller than 1.5 R _⊕ . HD 101581 is a promising system for atmospheric characterization and comparative planetology of small planets. |
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| spelling | doaj-art-0a7dad4e35ba484391bb7acdec3f9e312025-08-20T01:59:55ZengIOP PublishingThe Astronomical Journal1538-38812024-01-0116914710.3847/1538-3881/ad9266Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581Michelle Kunimoto0https://orcid.org/0000-0001-9269-8060Zifan Lin1https://orcid.org/0000-0003-0525-9647Sarah Millholland2https://orcid.org/0000-0003-3130-2282Alexander Venner3https://orcid.org/0000-0002-8400-1646Natalie R. Hinkel4https://orcid.org/0000-0003-0595-5132Avi Shporer5https://orcid.org/0000-0002-1836-3120Andrew Vanderburg6https://orcid.org/0000-0001-7246-5438Jeremy Bailey7https://orcid.org/0000-0002-5726-7000Rafael Brahm8https://orcid.org/0000-0002-9158-7315Jennifer A. Burt9https://orcid.org/0000-0002-0040-6815R. Paul Butler10https://orcid.org/0000-0003-1305-3761Brad Carter11https://orcid.org/0000-0003-0035-8769David R. Ciardi12https://orcid.org/0000-0002-5741-3047Karen A. Collins13https://orcid.org/0000-0001-6588-9574Kevin I. Collins14https://orcid.org/0000-0003-2781-3207Knicole D. Colón15https://orcid.org/0000-0001-8020-7121Jeffrey D. Crane16https://orcid.org/0000-0002-5226-787XTansu Daylan17https://orcid.org/0000-0002-6939-9211Matías R. Díaz18https://orcid.org/0000-0002-2100-3257John P. Doty19Fabo Feng20https://orcid.org/0000-0001-6039-0555Eike W. Guenther21https://orcid.org/0000-0002-9130-6747Jonathan Horner22https://orcid.org/0000-0002-1160-7970Steve B. Howell23https://orcid.org/0000-0002-2532-2853Jan Janik24https://orcid.org/0000-0002-6384-0184Hugh R. A. Jones25Petr Kabáth26https://orcid.org/0000-0002-1623-5352Shubham Kanodia27https://orcid.org/0000-0001-8401-4300Colin Littlefield28https://orcid.org/0000-0001-7746-5795Hugh P. Osborn29https://orcid.org/0000-0002-4047-4724Simon O’Toole30https://orcid.org/0000-0003-2839-8527Martin Paegert31https://orcid.org/0000-0001-8120-7457Pavel Pintr32Richard P. Schwarz33https://orcid.org/0000-0001-8227-1020Steve Shectman34https://orcid.org/0000-0002-8681-6136Gregor Srdoc35Keivan G. Stassun36https://orcid.org/0000-0002-3481-9052Johanna K. Teske37https://orcid.org/0009-0008-2801-5040Joseph D. Twicken38https://orcid.org/0000-0002-6778-7552Leonardo Vanzi39Sharon X. Wang40https://orcid.org/0000-0002-6937-9034Robert A. Wittenmyer41https://orcid.org/0000-0001-9957-9304Jon M. Jenkins42https://orcid.org/0000-0002-4715-9460George R. Ricker43https://orcid.org/0000-0003-2058-6662Sara Seager44https://orcid.org/0000-0002-6892-6948Joshua Winn45https://orcid.org/0000-0002-4265-047XDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; michelle.kunimoto@gmail.com; Department of Physics and Astronomy, University of British Columbia , 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USADepartment of Physics, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USAUniversity of Southern Queensland , Centre for Astrophysics, USQ Toowoomba, West Street, QLD 4350, AustraliaPhysics & Astronomy Department, Louisiana State University , Baton Rouge, LA 70803, USADepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; michelle.kunimoto@gmail.comDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; michelle.kunimoto@gmail.comSchool of Physics, University of New South Wales , Sydney, NSW 2052, AustraliaFacultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez , Avenida Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics , Chile; Data Observatory Foundation , ChileJet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Pasadena, CA 91109, USAEarth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USAUniversity of Southern Queensland , Centre for Astrophysics, USQ Toowoomba, West Street, QLD 4350, AustraliaCaltech/IPAC-NExScI , M/S 100-22, 770 S Wilson Avenue, Pasadena, CA 91106, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAGeorge Mason University, 4400 University Drive , Fairfax, VA, 22030, USANASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USAThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street , Pasadena, CA 91101, USADepartment of Physics and McDonnell Center for the Space Sciences, Washington University , St. Louis, MO 63130, USALas Campanas Observatory, Carnegie Institution of Washington , Colina El Pino, Casilla 601 La Serena, ChileNoqsi Aerospace Ltd. , 15 Blanchard Avenue, Billerica, MA 01821, USATsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai 201210, People's Republic of ChinaThueringer Landessternwarte Tautenburg , Sternwarte 5, 07778 Tautenburg, GermanyUniversity of Southern Queensland , Centre for Astrophysics, USQ Toowoomba, West Street, QLD 4350, AustraliaNASA Ames Research Center , Moffett Field, CA 94035, USADepartment of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University , Kotlařská 2, CZ-611 37, Brno, Czech RepublicCentre for Astrophysics Research, University of Hertfordshire , Hatfield AL10 9AB, UKAstronomical Institute of the Czech Academy of Sciences , Fričova 298, 25165, Ondřejov, Czech RepublicEarth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USANASA Ames Research Center , Moffett Field, CA 94035, USA; Bay Area Environmental Research Institute , Moffett Field, CA 94035, USAPhysikalisches Institut, University of Bern , Gesellsschaftstrasse 6, 3012 Bern, Switzerland; Department of Physics , ETH Zurich, Wolfgang-Pauli-Strasse 2, CH-8093 Zurich, SwitzerlandAustralian Astronomical Optics, macquarie University , North Ryde, NSW 1670, AustraliaCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAInstitute of Plasma Physics of Czech Academy of Sciences , U Slovanky 2525/1a, 182 00 Praha 8, Czech RepublicCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street , Pasadena, CA 91101, USAKotizarovci Observatory , Sarsoni 90, 51216 Viskovo, CroatiaDepartment of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USAEarth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USA; Carnegie Institution for Science & The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USANASA Ames Research Center , Moffett Field, CA 94035, USA; SETI Institute , Mountain View, CA 94043, USADepartment of Electrical Engineering and Centre of Astro-Engineering, Pontificia Universidad Catolica de Chile , Avenida Vicuña Mackenna 4860, Santiago, ChileDepartment of Astronomy, Tsinghua University , Beijing 100084, People’s Republic of ChinaUniversity of Southern Queensland , Centre for Astrophysics, USQ Toowoomba, West Street, QLD 4350, AustraliaNASA Ames Research Center , Moffett Field, CA 94035, USADepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; michelle.kunimoto@gmail.comDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; michelle.kunimoto@gmail.com; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , Cambridge, MA 02139, USADepartment of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USAWe report the validation of multiple planets transiting the nearby ( d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b ( ${R}_{p}={0.956}_{-0.061}^{+0.063}\,{R}_{\oplus }$ , P = 4.47 days) and HD 101581c ( ${R}_{p}={0.990}_{-0.070}^{+0.070}\,{R}_{\oplus }$ , P = 6.21 days). Both planets were discovered in Sectors 63 and 64 TESS observations and statistically validated with supporting ground-based follow-up. We also identify a signal that probably originates from a third transiting planet, TOI-6276.03 ( ${R}_{p}={0.982}_{-0.098}^{+0.114}\,{R}_{\oplus }$ , P = 7.87 days). These planets are remarkably uniform in size and their orbits are evenly spaced, representing a prime example of the “peas-in-a-pod” architecture seen in other compact multiplanet systems. At V = 7.77, HD 101581 is the brightest star known to host multiple transiting planets smaller than 1.5 R _⊕ . HD 101581 is a promising system for atmospheric characterization and comparative planetology of small planets.https://doi.org/10.3847/1538-3881/ad9266Exoplanet systemsExoplanet dynamicsExoplanetsTransit photometry |
| spellingShingle | Michelle Kunimoto Zifan Lin Sarah Millholland Alexander Venner Natalie R. Hinkel Avi Shporer Andrew Vanderburg Jeremy Bailey Rafael Brahm Jennifer A. Burt R. Paul Butler Brad Carter David R. Ciardi Karen A. Collins Kevin I. Collins Knicole D. Colón Jeffrey D. Crane Tansu Daylan Matías R. Díaz John P. Doty Fabo Feng Eike W. Guenther Jonathan Horner Steve B. Howell Jan Janik Hugh R. A. Jones Petr Kabáth Shubham Kanodia Colin Littlefield Hugh P. Osborn Simon O’Toole Martin Paegert Pavel Pintr Richard P. Schwarz Steve Shectman Gregor Srdoc Keivan G. Stassun Johanna K. Teske Joseph D. Twicken Leonardo Vanzi Sharon X. Wang Robert A. Wittenmyer Jon M. Jenkins George R. Ricker Sara Seager Joshua Winn Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 The Astronomical Journal Exoplanet systems Exoplanet dynamics Exoplanets Transit photometry |
| title | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
| title_full | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
| title_fullStr | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
| title_full_unstemmed | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
| title_short | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
| title_sort | two earth size planets and an earth size candidate transiting the nearby star hd 101581 |
| topic | Exoplanet systems Exoplanet dynamics Exoplanets Transit photometry |
| url | https://doi.org/10.3847/1538-3881/ad9266 |
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