An Eccentric Sub-Neptune Moving Into the Evaporation Desert
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Jenkins, Sydney Vanderburg, Andrew Sethi, Ritika Millholland, Sarah Rodriguez, Joseph E. Fossati, Luca Krenn, Andreas Pass, Emily Venner, Alex Butler, Paul Osborn, Hugh Householder, Aaron Ziegler, Carl Becker, Juliette Berlind, Perry Bieryla, Allyson Broeg, Christopher Calkins, Michael L. Crane, Jeffrey D. Daylan, Tansu de Wit, Julien Eastman, Jason D. Ehrenreich, David Esquerdo, Gilbert A. Fausnaugh, Michael Gaibor, Yadira Latham, David W. Lendl, Monika Mayo, Andrew W. Scandariato, Gaetano Shectman, Steve Striegel, Stephanie Teske, Johanna Wilson, Thomas G. |
| author_facet | Jenkins, Sydney Vanderburg, Andrew Sethi, Ritika Millholland, Sarah Rodriguez, Joseph E. Fossati, Luca Krenn, Andreas Pass, Emily Venner, Alex Butler, Paul Osborn, Hugh Householder, Aaron Ziegler, Carl Becker, Juliette Berlind, Perry Bieryla, Allyson Broeg, Christopher Calkins, Michael L. Crane, Jeffrey D. Daylan, Tansu de Wit, Julien Eastman, Jason D. Ehrenreich, David Esquerdo, Gilbert A. Fausnaugh, Michael Gaibor, Yadira Latham, David W. Lendl, Monika Mayo, Andrew W. Scandariato, Gaetano Shectman, Steve Striegel, Stephanie Teske, Johanna Wilson, Thomas G. |
| contents | Though missions such as Kepler, K2, and TESS have discovered $>$2,000 sub-Neptune and Neptunian planets, there is a dearth of such planets at close-in (P$\lesssim$3 days) orbits. This feature, called the Neptune desert or the evaporation desert, is believed to be primarily shaped by planetary migration and photoevaporation. However, this region is not completely devoid of planets--a small number of very hot Neptunes reside within the desert. These planets provide an opportunity to directly probe the effects of migration and photoevaporation. We present confirmation of TOI-5800 b, an eccentric sub-Neptune on a $\approx$2.6 day period that is likely actively undergoing tidal migration. We use radial velocity measurements from the Carnegie Planet Finder Spectrograph (PFS) to constrain TOI-5800 b's mass and eccentricity. We find that it has an unusually high eccentricity (0.39$\pm$0.07) for its short orbit. TOI-5800 is therefore currently experiencing high levels of tidal heating as it moves into the desert. Ranked as a top candidate for transmission and emission spectroscopy within its temperature and radius regime, TOI-5800 b is a prime target for atmospheric characterization with JWST. TOI-5800 b presents a unique opportunity to study the atmosphere of a planet undergoing tidal heating and to probe the composition of sub-Neptune planets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10324 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An Eccentric Sub-Neptune Moving Into the Evaporation Desert Jenkins, Sydney Vanderburg, Andrew Sethi, Ritika Millholland, Sarah Rodriguez, Joseph E. Fossati, Luca Krenn, Andreas Pass, Emily Venner, Alex Butler, Paul Osborn, Hugh Householder, Aaron Ziegler, Carl Becker, Juliette Berlind, Perry Bieryla, Allyson Broeg, Christopher Calkins, Michael L. Crane, Jeffrey D. Daylan, Tansu de Wit, Julien Eastman, Jason D. Ehrenreich, David Esquerdo, Gilbert A. Fausnaugh, Michael Gaibor, Yadira Latham, David W. Lendl, Monika Mayo, Andrew W. Scandariato, Gaetano Shectman, Steve Striegel, Stephanie Teske, Johanna Wilson, Thomas G. Earth and Planetary Astrophysics Solar and Stellar Astrophysics Though missions such as Kepler, K2, and TESS have discovered $>$2,000 sub-Neptune and Neptunian planets, there is a dearth of such planets at close-in (P$\lesssim$3 days) orbits. This feature, called the Neptune desert or the evaporation desert, is believed to be primarily shaped by planetary migration and photoevaporation. However, this region is not completely devoid of planets--a small number of very hot Neptunes reside within the desert. These planets provide an opportunity to directly probe the effects of migration and photoevaporation. We present confirmation of TOI-5800 b, an eccentric sub-Neptune on a $\approx$2.6 day period that is likely actively undergoing tidal migration. We use radial velocity measurements from the Carnegie Planet Finder Spectrograph (PFS) to constrain TOI-5800 b's mass and eccentricity. We find that it has an unusually high eccentricity (0.39$\pm$0.07) for its short orbit. TOI-5800 is therefore currently experiencing high levels of tidal heating as it moves into the desert. Ranked as a top candidate for transmission and emission spectroscopy within its temperature and radius regime, TOI-5800 b is a prime target for atmospheric characterization with JWST. TOI-5800 b presents a unique opportunity to study the atmosphere of a planet undergoing tidal heating and to probe the composition of sub-Neptune planets. |
| title | An Eccentric Sub-Neptune Moving Into the Evaporation Desert |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2505.10324 |