The Eccentricity Distribution of Warm Sub-Saturns in TESS
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2025
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| author | Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Ajizian, Calvin Fukui, Akihiko Baker, David Conzo, Giuseppe Fisher, Robert Scott Forés-Toribio, Raquel Gan, Tianjun Garmash, Alexey Ikuta, Kai Lark, Adam de Leon, Jerome P. Linnenkohl, Katherine Mann, Christopher R. Mitchem, Owen Mori, Mayuko Muñoz, Jose A. Narita, Norio Popowicz, Adam Radford, Don Randolph, Justus Frustaglia, Fabian Rodriguez Schwarz, Richard P. Stockdale, Chris Wang, Jiaqi Watanabe, Noriharu Wilkin, Francis P. Zieliński, Krzysztof Sz. Esparza-Borges, Emma Murgas, Felipe Pallé, Enric Parviainen, Hannu Yalçınkaya, Selçuk Baştürk, Özgür |
| author_facet | Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Ajizian, Calvin Fukui, Akihiko Baker, David Conzo, Giuseppe Fisher, Robert Scott Forés-Toribio, Raquel Gan, Tianjun Garmash, Alexey Ikuta, Kai Lark, Adam de Leon, Jerome P. Linnenkohl, Katherine Mann, Christopher R. Mitchem, Owen Mori, Mayuko Muñoz, Jose A. Narita, Norio Popowicz, Adam Radford, Don Randolph, Justus Frustaglia, Fabian Rodriguez Schwarz, Richard P. Stockdale, Chris Wang, Jiaqi Watanabe, Noriharu Wilkin, Francis P. Zieliński, Krzysztof Sz. Esparza-Borges, Emma Murgas, Felipe Pallé, Enric Parviainen, Hannu Yalçınkaya, Selçuk Baştürk, Özgür |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04106 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Eccentricity Distribution of Warm Sub-Saturns in TESS Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Ajizian, Calvin Fukui, Akihiko Baker, David Conzo, Giuseppe Fisher, Robert Scott Forés-Toribio, Raquel Gan, Tianjun Garmash, Alexey Ikuta, Kai Lark, Adam de Leon, Jerome P. Linnenkohl, Katherine Mann, Christopher R. Mitchem, Owen Mori, Mayuko Muñoz, Jose A. Narita, Norio Popowicz, Adam Radford, Don Randolph, Justus Frustaglia, Fabian Rodriguez Schwarz, Richard P. Stockdale, Chris Wang, Jiaqi Watanabe, Noriharu Wilkin, Francis P. Zieliński, Krzysztof Sz. Esparza-Borges, Emma Murgas, Felipe Pallé, Enric Parviainen, Hannu Yalçınkaya, Selçuk Baştürk, Özgür Earth and Planetary Astrophysics 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. |
| title | The Eccentricity Distribution of Warm Sub-Saturns in TESS |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2505.04106 |