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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2410.00641 |
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| _version_ | 1866909331523371008 |
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| author | Lu, Tiger Li, Gongjie Cassese, Ben Lin, Doug |
| author_facet | Lu, Tiger Li, Gongjie Cassese, Ben Lin, Doug |
| contents | The super-puff HIP-41378 f represents a fascinating puzzle due to its anomalously low density on a far-out orbit in contrast with other known super-puffs. In this work, we explore the hypothesis that HIP-41378 f is not in fact a low-density planet, but rather hosts an opaque ring system. We analyze the dynamical history of the system, and show that convergent migration is necessary to explain the system's long-term stability. We then show that this same migration process plausibly captures HIP-41378 f into spin-orbit resonance and excites the planetary obliquity to high values. This tilts the surrounding ring and is a plausible explanation for the large transit depth. In the end, we also briefly comment on the likelihood of other super-puff planets being in high-obliquity states. We show that the existence of a tilted extensive ring around a high obliquity planet can serve as an explanation for puffy planets, particularly in multi-planetary systems at far distances from their host stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_00641 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Dynamical History of HIP-41378 f -- Oblique Exorings Masquerading as a Puffy Planet Lu, Tiger Li, Gongjie Cassese, Ben Lin, Doug Earth and Planetary Astrophysics The super-puff HIP-41378 f represents a fascinating puzzle due to its anomalously low density on a far-out orbit in contrast with other known super-puffs. In this work, we explore the hypothesis that HIP-41378 f is not in fact a low-density planet, but rather hosts an opaque ring system. We analyze the dynamical history of the system, and show that convergent migration is necessary to explain the system's long-term stability. We then show that this same migration process plausibly captures HIP-41378 f into spin-orbit resonance and excites the planetary obliquity to high values. This tilts the surrounding ring and is a plausible explanation for the large transit depth. In the end, we also briefly comment on the likelihood of other super-puff planets being in high-obliquity states. We show that the existence of a tilted extensive ring around a high obliquity planet can serve as an explanation for puffy planets, particularly in multi-planetary systems at far distances from their host stars. |
| title | The Dynamical History of HIP-41378 f -- Oblique Exorings Masquerading as a Puffy Planet |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2410.00641 |