The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet
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...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ada4b2 |
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| author | Tiger Lu Gongjie Li Ben Cassese D. N. C. Lin |
| author_facet | Tiger Lu Gongjie Li Ben Cassese D. N. C. Lin |
| author_sort | Tiger Lu |
| collection | DOAJ |
| description | 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 multiplanetary systems at far distances from their host stars. |
| format | Article |
| id | doaj-art-3756773b0a2642d0904e6eba65813951 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-3756773b0a2642d0904e6eba658139512025-02-03T07:31:44ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198013910.3847/1538-4357/ada4b2The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy PlanetTiger Lu0https://orcid.org/0000-0003-0834-8645Gongjie Li1https://orcid.org/0000-0001-8308-0808Ben Cassese2https://orcid.org/0000-0002-9544-0118D. N. C. Lin3https://orcid.org/0000-0001-5466-4628Department of Astronomy, Yale University , 219 Prospect Street, New Haven, CT 06511, USA ; tiger.lu@yale.eduCenter for Relativistic Astrophysics , School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USADepartment of Astronomy, Columbia University , 550 W 120th Street, New York, NY 10027, USADepartment of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USAThe 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 multiplanetary systems at far distances from their host stars.https://doi.org/10.3847/1538-4357/ada4b2Exoplanet dynamicsSpin-orbit resonances |
| spellingShingle | Tiger Lu Gongjie Li Ben Cassese D. N. C. Lin The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet The Astrophysical Journal Exoplanet dynamics Spin-orbit resonances |
| title | The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet |
| title_full | The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet |
| title_fullStr | The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet |
| title_full_unstemmed | The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet |
| title_short | The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet |
| title_sort | dynamical history of hip 41378 f oblique exorings masquerading as a puffy planet |
| topic | Exoplanet dynamics Spin-orbit resonances |
| url | https://doi.org/10.3847/1538-4357/ada4b2 |
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