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| Format: | Preprint |
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2025
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| Accès en ligne: | https://arxiv.org/abs/2505.00898 |
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| author | 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. 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 López, José Vinés Wang, Sharon X. Wheatley, Peter J. Winn, Joshua N. Zuidema, Edward E. |
| author_facet | 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. 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 López, José Vinés Wang, Sharon X. Wheatley, Peter J. Winn, Joshua N. Zuidema, Edward E. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00898 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth 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. 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 López, José Vinés Wang, Sharon X. Wheatley, Peter J. Winn, Joshua N. Zuidema, Edward E. Earth and Planetary Astrophysics 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. |
| title | HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2505.00898 |