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Astrophysics > Earth and Planetary Astrophysics
Title: TOI-837b is a Young Saturn-sized Exoplanet with a Massive 70 $M_{\oplus}$ Core
(Submitted on 21 Apr 2024 (v1), last revised 23 May 2024 (this version, v2))
Abstract: We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837b, with an orbital period of 8.32d. Utilising data from TESS and ground-based observations, we determine a planetary radius of 0.82 R_J for TOI-837b. Through detailed HARPS spectroscopic time series analysis, we derive a Doppler semi-amplitude of 35 m/s, corresponding to a planetary mass of 0.39 M_J. The derived planetary properties suggest a substantial core of approximately 70 M_E, constituting about 60% of the planet's total mass. This finding poses a significant challenge to existing theoretical models of core formation. We propose that future atmospheric observations with JWST could provide insights into resolving ambiguities of TOI-837b, offering new perspectives on its composition, formation, and evolution.
Submission history
From: Oscar Barragán [view email][v1] Sun, 21 Apr 2024 19:15:53 GMT (6524kb,D)
[v2] Thu, 23 May 2024 15:21:50 GMT (7666kb,D)
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