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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.10571 |
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| _version_ | 1866929681765236736 |
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| author | Kipping, David Solano-Oropeza, Diana Yahalomi, Daniel A. Li, Madison Poddar, Avishi Zhang, Xunhe |
| author_facet | Kipping, David Solano-Oropeza, Diana Yahalomi, Daniel A. Li, Madison Poddar, Avishi Zhang, Xunhe |
| contents | Recent advances have enabled the discovery of a population of potentially Earth-like planets, yet their orbital eccentricity, which governs their climate and provides clues about their origin and dynamical history, is still largely unconstrained. We identify a sample of 17 transiting exoplanets around late-type stars with similar radii and irradiation to that of Earth and use the "photoeccentric effect" - which exploits transit durations - to infer their eccentricity distribution via hierarchical Bayesian modelling. Our analysis establishes that these worlds further resemble Earth in that their eccentricities are nearly circular (mean eccentricity $=0.060_{-0.028}^{+0.040}$ and $\leq0.15$), with the exception of one outlier of moderate eccentricity. The results hint at a subset population of dynamically warmer Earths, but this requires a larger sample to statistically confirm. The planets in our sample are thus largely subject to minimal eccentricity-induced seasonal variability and are consistent with emerging via smooth disk migration rather than violent planet-planet scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Near-circular orbits for planets around M/K-type stars with Earth-like sizes and instellations Kipping, David Solano-Oropeza, Diana Yahalomi, Daniel A. Li, Madison Poddar, Avishi Zhang, Xunhe Earth and Planetary Astrophysics Recent advances have enabled the discovery of a population of potentially Earth-like planets, yet their orbital eccentricity, which governs their climate and provides clues about their origin and dynamical history, is still largely unconstrained. We identify a sample of 17 transiting exoplanets around late-type stars with similar radii and irradiation to that of Earth and use the "photoeccentric effect" - which exploits transit durations - to infer their eccentricity distribution via hierarchical Bayesian modelling. Our analysis establishes that these worlds further resemble Earth in that their eccentricities are nearly circular (mean eccentricity $=0.060_{-0.028}^{+0.040}$ and $\leq0.15$), with the exception of one outlier of moderate eccentricity. The results hint at a subset population of dynamically warmer Earths, but this requires a larger sample to statistically confirm. The planets in our sample are thus largely subject to minimal eccentricity-induced seasonal variability and are consistent with emerging via smooth disk migration rather than violent planet-planet scattering. |
| title | Near-circular orbits for planets around M/K-type stars with Earth-like sizes and instellations |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2501.10571 |