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

Contribution to Journal

Hesse, Katharine, Mireles, Ismael, Bouchy, François, Dragomir, Diana, Ulmer-Moll, Solène, Eisner, Nora L., Stassun, Keivan G., Quinn, Samuel N., Osborn, Hugh P., Sousa, Sergio G., Watkins, Cristilyn N., Collins, Karen A., Bryant, Edward M., Irwin, Jonathan M., Hellier, Coel, Johnson, Marshall C., Ziegler, Carl, Howell, Steve B., Anderson, David R., ..., Nicholson, B.. 2025. "HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth." The Astronomical Journal. 170, p. 108. https://doi.org/10.3847/1538-3881/add7d7
Article Title

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

AuthorsHesse, Katharine, Mireles, Ismael, Bouchy, François, Dragomir, Diana, Ulmer-Moll, Solène, Eisner, Nora L., Stassun, Keivan G., Quinn, Samuel N., Osborn, Hugh P., Sousa, Sergio G., Watkins, Cristilyn N., Collins, Karen A., Bryant, Edward M., Irwin, Jonathan M., Hellier, Coel, Johnson, Marshall C., Ziegler, Carl, Howell, Steve B., Anderson, David R., Bayliss, Daniel, Bieryla, Allyson, Briceño, César, Butler, R. Paul, Charbonneau, David, Cloutier, Ryan, Crane, Jeffrey, Dittmann, Jason, Eastman, Jason D., Freigeiro, Sebastián A., Fulton, Benjamin J., Gill, Samuel, Günther, Maximilian, Im, Haedam, Jenkins, Jon M., Kunimoto, Michelle, Lavie, Baptiste, Lendl, Monika, Lund, Michael B., Mann, Andrew W., Nicholson, Belinda, Osip, David, Paegert, Martin, Santos, Nuno C., Schwarz, Richard P., Seager, Sara, Shectman, Stephen, Teske, Johanna, Twicken, Joseph D., Udry, Stéphane, Van Eylen, Vincent, Vinés, José, Wang, Sharon X., Wheatley, Peter J., Winn, Joshua N., Zuidema, Edward E. and Nicholson, B.
Journal TitleThe Astronomical Journal
Journal Citation170, p. 108
Number of Pages108
Year2025
01 Aug 2025
Digital Object Identifier (DOI)https://doi.org/10.3847/1538-3881/add7d7
Web Address (URL)https://ui.adsabs.harvard.edu/abs/2025AJ....170..108H
AbstractWe 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<SUB>⊕</SUB>. For HD 35843 c, a joint photometric and spectroscopic analysis yields a radius of 2.54 ± 0.08 R<SUB>⊕</SUB>, a mass of 11.32 ± 1.60 M<SUB>⊕</SUB>, and an orbital eccentricity of e = 0.15 ± 0.07. With a bulk density of 3.80 ± 0.70 g cm<SUP>−3</SUP>, the planet might be rocky with a substantial H<SUB>2</SUB> 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.
KeywordsExoplanet astronomy; Exoplanet detection methods; Planet hosting
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
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