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 observations to rule out false-positive scenarios and validate the planet. We then use ESPRESSO radial velocities 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 $5.84\pm0.84$ $M_{\oplus}$. For HD 35843 c, a joint photometric and spectroscopic analysis yields a radius of $2.54 \pm 0.08 R_{\oplus}$, a mass of $11.32 \pm 1.60 M_{\oplus}$, and an orbital eccentricity of $e = 0.15\pm0.07$. With a bulk density of $3.80 \pm 0.70$ 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 $\sim$480 K, HD 35843 c is among the coolest $\sim 5\%$ 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.
Joseph D. Twicken、Stéphane Udry、Sharon X. Wang、Peter J. Wheatley、José Vinés López、Vincent Van Eylen、Edward E. Zuidema、Joshua N. Winn、Katharine Hesse、Ismael Mireles、Fran?ois 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 Brice?o、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
天文学
Joseph D. Twicken,Stéphane Udry,Sharon X. Wang,Peter J. Wheatley,José Vinés López,Vincent Van Eylen,Edward E. Zuidema,Joshua N. Winn,Katharine Hesse,Ismael Mireles,Fran?ois 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 Brice?o,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.HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth[EB/OL].(2025-05-01)[2025-06-07].https://arxiv.org/abs/2505.00898.点此复制
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