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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Accès en ligne: | https://arxiv.org/abs/2406.12996 |
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| author | Hacker, Alejandro Díaz, Rodrigo F. Armstrong, David J. Fernández, Jorge Fernández Müller, Simon Delgado-Mena, Elisa Sousa, Sérgio G. Adibekyan, Vardan Stassun, Keivan G. Collins, Karen A. Yee, Samuel W. Bayliss, Daniel Bieryla, Allyson Bouchy, François Butler, R. Paul Crane, Jeffrey D. Dumusque, Xavier Hartman, Joel D. Helled, Ravit Jenkins, Jon Keniger, Marcelo Aron F. Lewis, Hannah Lillo-Box, Jorge Lund, Michael B. Nielsen, Louise D. Osborn, Ares Osip, David Paegert, Martin Radford, Don J. Santos, Nuno C. Seager, Sara Shectman, Stephen A. Srdoc, Gregor Strøm, Paul A. Tan, Thiam-Guan Teske, Johanna K. Vezie, Michael Watanabe, David Watkins, Cristilyn N. Wheatley, Peter J. Winn, Joshua N. Wohler, Bill Ziegler, Carl |
| author_facet | Hacker, Alejandro Díaz, Rodrigo F. Armstrong, David J. Fernández, Jorge Fernández Müller, Simon Delgado-Mena, Elisa Sousa, Sérgio G. Adibekyan, Vardan Stassun, Keivan G. Collins, Karen A. Yee, Samuel W. Bayliss, Daniel Bieryla, Allyson Bouchy, François Butler, R. Paul Crane, Jeffrey D. Dumusque, Xavier Hartman, Joel D. Helled, Ravit Jenkins, Jon Keniger, Marcelo Aron F. Lewis, Hannah Lillo-Box, Jorge Lund, Michael B. Nielsen, Louise D. Osborn, Ares Osip, David Paegert, Martin Radford, Don J. Santos, Nuno C. Seager, Sara Shectman, Stephen A. Srdoc, Gregor Strøm, Paul A. Tan, Thiam-Guan Teske, Johanna K. Vezie, Michael Watanabe, David Watkins, Cristilyn N. Wheatley, Peter J. Winn, Joshua N. Wohler, Bill Ziegler, Carl |
| contents | We report the discovery of two transiting planets detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V and an F8V star, respectively, with periods of 4.31 and 1.27 days, respectively. We confirm and characterize these two planets with a variety of ground-based and follow-up observations, including photometry, precise radial velocity monitoring and high-resolution imaging. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We found that the two planets have masses of $(57 \pm 4)$ $M_\oplus$ or $(0.18 \pm 0.01)$ $M_J$, and $(68 \pm 4)$ $M_\oplus$ or $(0.21 \pm 0.01)$ $M_J$, respectively, and they have radii of $(6.8 \pm 0.3)$ $R_\oplus$ or $(0.61 \pm 0.03)$ $R_J$ and $(7.2 \pm 0.5)$ $R_\oplus$ or $(0.64 \pm 0.05)$ $R_J$, respectively. These parameters correspond to sub-Saturns within the Neptunian desert, both planets being hot and highly irradiated, with $T_{\rm eq} \approx 745$ $K$ and $T_{\rm eq} \approx 1812$ $K$, respectively, assuming a Bond albedo of 0.5. TOI-3071 b has the hottest equilibrium temperature of all known planets with masses between $10$ and $300$ $M_\oplus$ and radii less than $1.5$ $R_J$. By applying gas giant evolution models we found that both planets, especially TOI-3071 b, are very metal-rich. This challenges standard formation models which generally predict lower heavy-element masses for planets with similar characteristics. We studied the evolution of the planets' atmospheres under photoevaporation and concluded that both are stable against evaporation due to their large masses and likely high metallicities in their gaseous envelopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_12996 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | TOI-2374 b and TOI-3071 b: two metal-rich sub-Saturns well within the Neptunian desert Hacker, Alejandro Díaz, Rodrigo F. Armstrong, David J. Fernández, Jorge Fernández Müller, Simon Delgado-Mena, Elisa Sousa, Sérgio G. Adibekyan, Vardan Stassun, Keivan G. Collins, Karen A. Yee, Samuel W. Bayliss, Daniel Bieryla, Allyson Bouchy, François Butler, R. Paul Crane, Jeffrey D. Dumusque, Xavier Hartman, Joel D. Helled, Ravit Jenkins, Jon Keniger, Marcelo Aron F. Lewis, Hannah Lillo-Box, Jorge Lund, Michael B. Nielsen, Louise D. Osborn, Ares Osip, David Paegert, Martin Radford, Don J. Santos, Nuno C. Seager, Sara Shectman, Stephen A. Srdoc, Gregor Strøm, Paul A. Tan, Thiam-Guan Teske, Johanna K. Vezie, Michael Watanabe, David Watkins, Cristilyn N. Wheatley, Peter J. Winn, Joshua N. Wohler, Bill Ziegler, Carl Earth and Planetary Astrophysics We report the discovery of two transiting planets detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V and an F8V star, respectively, with periods of 4.31 and 1.27 days, respectively. We confirm and characterize these two planets with a variety of ground-based and follow-up observations, including photometry, precise radial velocity monitoring and high-resolution imaging. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We found that the two planets have masses of $(57 \pm 4)$ $M_\oplus$ or $(0.18 \pm 0.01)$ $M_J$, and $(68 \pm 4)$ $M_\oplus$ or $(0.21 \pm 0.01)$ $M_J$, respectively, and they have radii of $(6.8 \pm 0.3)$ $R_\oplus$ or $(0.61 \pm 0.03)$ $R_J$ and $(7.2 \pm 0.5)$ $R_\oplus$ or $(0.64 \pm 0.05)$ $R_J$, respectively. These parameters correspond to sub-Saturns within the Neptunian desert, both planets being hot and highly irradiated, with $T_{\rm eq} \approx 745$ $K$ and $T_{\rm eq} \approx 1812$ $K$, respectively, assuming a Bond albedo of 0.5. TOI-3071 b has the hottest equilibrium temperature of all known planets with masses between $10$ and $300$ $M_\oplus$ and radii less than $1.5$ $R_J$. By applying gas giant evolution models we found that both planets, especially TOI-3071 b, are very metal-rich. This challenges standard formation models which generally predict lower heavy-element masses for planets with similar characteristics. We studied the evolution of the planets' atmospheres under photoevaporation and concluded that both are stable against evaporation due to their large masses and likely high metallicities in their gaseous envelopes. |
| title | TOI-2374 b and TOI-3071 b: two metal-rich sub-Saturns well within the Neptunian desert |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2406.12996 |