Thorngren, Daniel P. and Lee, Eve J. and Lopez, Eric D. (2023) Removal of Hot Saturns in Mass–Radius Plane by Runaway Mass Loss. The Astrophysical Journal Letters, 945 (2). L36. ISSN 2041-8205
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Abstract
The hot Saturn population exhibits a boundary in mass–radius space, such that no planets are observed at a density less than ∼0.1 g cm−3. Yet, planet interior structure models can readily construct such objects as the natural result of radius inflation. Here, we investigate the role X-ray and extreme UV irradiation (XUV)-driven mass loss plays in sculpting the density boundary by constructing interior structure models that include radius inflation, photoevaporative mass loss, and a simple prescription of Roche lobe overflow. We demonstrate that planets puffier than ∼0.1 g cm−3 experience a runaway mass loss caused by adiabatic radius expansion as the gas layer is stripped away, providing a good explanation of the observed edge in mass–radius space. The process is also visible in the radius–period and mass–period spaces, though smaller, high-bulk-metallicity planets can still survive at short periods, preserving a partial record of the population distribution at formation.
Item Type: | Article |
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Subjects: | Bengali Archive > Physics and Astronomy |
Depositing User: | Unnamed user with email support@bengaliarchive.com |
Date Deposited: | 17 Apr 2023 06:28 |
Last Modified: | 24 Sep 2024 11:28 |
URI: | http://science.archiveopenbook.com/id/eprint/850 |