HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth

HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth

We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Planet Hunters TESS. We combine data from TESS and follow-up ob...

Full description

Saved in:
Bibliographic Details
Main Authors: Katharine Hesse, Ismael Mireles, François Bouchy, Diana Dragomir, Solène Ulmer-Moll, Nora L. Eisner, Keivan G. Stassun, Samuel N. Quinn, Hugh P. Osborn, Sergio G. Sousa, Cristilyn N. Watkins, Karen A. Collins, Edward M. Bryant, Jonathan M. Irwin, Coel Hellier, Marshall C. Johnson, Carl Ziegler, Steve B. Howell, David R. Anderson, Daniel Bayliss, Allyson Bieryla, César Briceño, R. Paul Butler, David Charbonneau, Ryan Cloutier, Jeffrey Crane, Jason Dittmann, Jason D. Eastman, Sebastián A. Freigeiro, Benjamin J. Fulton, Samuel Gill, Maximilian Günther, Haedam Im, Jon M. Jenkins, Michelle Kunimoto, Baptiste Lavie, Monika Lendl, Michael B. Lund, Andrew W. Mann, Belinda Nicholson, David Osip, Martin Paegert, Nuno C. Santos, Richard P. Schwarz, Sara Seager, Stephen Shectman, Johanna Teske, Joseph D. Twicken, Stéphane Udry, Vincent Van Eylen, José Vinés, Sharon X. Wang, Peter J. Wheatley, Joshua N. Winn, Edward E. Zuidema
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astronomical Journal
Subjects:
Exoplanet astronomy
Exoplanet detection methods
Planet hosting stars
Transit photometry
Radial velocity
High resolution spectroscopy
Online Access:https://doi.org/10.3847/1538-3881/add7d7
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Planet Hunters TESS. We combine data from TESS and follow-up observations to rule out false-positive scenarios and validate the planet. We then use ESPRESSO radial velocities (RVs) to confirm the planetary nature and characterize the planet’s mass and orbit. Further analysis of these RVs reveals the presence of an additional planet, HD 35843 b, with a period of 9.90 days and a minimum mass of 5.84 ± 0.84 M _⊕ . For HD 35843 c, a joint photometric and spectroscopic analysis yields a radius of 2.54 ± 0.08 R _⊕ , a mass of 11.32 ± 1.60 M _⊕ , and an orbital eccentricity of e  = 0.15 ± 0.07. With a bulk density of 3.80 ± 0.70 g cm ^−3 , the planet might be rocky with a substantial H _2 atmosphere or it might be a “water world.” With an equilibrium temperature of ∼480 K, HD 35843 c is among the coolest ∼5% of planets discovered by TESS. Combined with the host star’s relative brightness ( V = 9.4), HD 35843 c is a promising target for atmospheric characterization that will probe this sparse population of temperate sub-Neptunes.
ISSN:1538-3881

Similar Items