The Eccentricity Distribution of Warm Sub-Saturns in TESS
The Eccentricity Distribution of Warm Sub-Saturns in TESS
We present the eccentricity distribution of warm sub-Saturns (4-8 Re, 8-200 day periods) as derived from an analysis of transit light curves from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. We use the "photoeccentric" effect to constrain the eccentricities of 76 planets, comprising 60 and 16 from single- and multi-transiting systems, respectively. We employ Hierarchical Bayesian Modelling to infer the eccentricity distribution of the population, testing both a Beta and Mixture Beta distribution. We identify a few highly eccentric (e ~ 0.7-0.8) warm sub-Saturns with eccentricities that appear too high to be explained by disk migration or planet-planet scattering alone, suggesting high-eccentricity migration may play a role in their formation. The majority of the population have a mean eccentricity of e = 0.103+0.047-0.045, consistent with both planet-disk and planet-planet interactions. Notably, we find that the highly eccentric sub-Saturns occur in single-transiting systems. This study presents the first evidence at the population level that the eccentricities of sub-Saturns may be sculpted by dynamical processes.
Norio Narita、Adam Popowicz、Don Radford、Justus Randolph、Fabian Rodriguez Frustaglia、Richard P. Schwarz、Chris Stockdale、Jiaqi Wang、Noriharu Watanabe、Francis P. Wilkin、Krzysztof Sz. Zieliński、Emma Esparza-Borges、Felipe Murgas、Enric Pallé、Hannu Parviainen、Sel?uk Yal??nkaya、?zgür Ba?türk、Chelsea X. Huang、Emma Nabbie、George Zhou、Duncan Wright、Karen A. Collins、Jon M. Jenkins、David W. Latham、George Ricker、Samuel N. Quinn、Sara Seager、Avi Shporer、Roland Vanderspek、Joshua N. Winn、Calvin Ajizian、Akihiko Fukui、David Baker、Giuseppe Conzo、Robert Scott Fisher、Raquel Forés-Toribio、Tianjun Gan、Alexey Garmash、Kai Ikuta、Adam Lark、Jerome P. de Leon、Katherine Linnenkohl、Christopher R. Mann、Owen Mitchem、Jiayin Dong、Mayuko Mori、Jose A. Mu?oz、Tyler R. Fairnington
天文学
Norio Narita,Adam Popowicz,Don Radford,Justus Randolph,Fabian Rodriguez Frustaglia,Richard P. Schwarz,Chris Stockdale,Jiaqi Wang,Noriharu Watanabe,Francis P. Wilkin,Krzysztof Sz. Zieliński,Emma Esparza-Borges,Felipe Murgas,Enric Pallé,Hannu Parviainen,Sel?uk Yal??nkaya,?zgür Ba?türk,Chelsea X. Huang,Emma Nabbie,George Zhou,Duncan Wright,Karen A. Collins,Jon M. Jenkins,David W. Latham,George Ricker,Samuel N. Quinn,Sara Seager,Avi Shporer,Roland Vanderspek,Joshua N. Winn,Calvin Ajizian,Akihiko Fukui,David Baker,Giuseppe Conzo,Robert Scott Fisher,Raquel Forés-Toribio,Tianjun Gan,Alexey Garmash,Kai Ikuta,Adam Lark,Jerome P. de Leon,Katherine Linnenkohl,Christopher R. Mann,Owen Mitchem,Jiayin Dong,Mayuko Mori,Jose A. Mu?oz,Tyler R. Fairnington.The Eccentricity Distribution of Warm Sub-Saturns in TESS[EB/OL].(2025-05-06)[2025-06-21].https://arxiv.org/abs/2505.04106.点此复制
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