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Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
- Source :
- The Astrophysical Journal Letters, Vol 971, Iss 2, p L40 (2024)
- Publication Year :
- 2024
- Publisher :
- IOP Publishing, 2024.
-
Abstract
- The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrated to their current orbits, perhaps via high-eccentricity migration (HEM), a process that can also excite obliquities. A handful of known exoplanets are perhaps caught in the act of HEM, as they are observed on highly eccentric orbits with tidal circularization timescales shorter than their ages. One such exoplanet is Kepler-1656 b, which is also the only known nongiant exoplanet ( 0.8 to have its obliquity constrained; expanding this population will help establish the degree to which orbital misalignment accompanies migration. Future work that constrains the mutual inclinations of outer perturbers will be key for distinguishing plausible mechanisms.
Details
- Language :
- English
- ISSN :
- 20418213 and 20418205
- Volume :
- 971
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- The Astrophysical Journal Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.234d08d633ca4ccf9582f2e68d559638
- Document Type :
- article
- Full Text :
- https://doi.org/10.3847/2041-8213/ad6985