SUPER-ECCENTRIC MIGRATING JUPITERS
Open accessAbstract
An important class of formation theories for hot Jupiters involves the excitation of extreme orbital eccentricity ( e = 0.99 or even larger) followed by tidal dissipation at periastron passage that eventually circularizes the planetary orbit at a period less than 10 days. In a steady state, this mechanism requires the existence of a significant population of super-eccentric ( e > 0.9) migrating Jupiters with long orbital periods and periastron distances of only a few stellar radii. For these super-eccentric planets, the periastron is fixed due to conservation of orbital angular momentum and the energy dissipated per orbit is constant, implying that the rate of change in semi-major axis a is and consequently the number distribution satisfies . If this formation process produces most hot Jupiters, Kepler should detect several super-eccentric migrating progenitors of hot Jupiters, allowing for a test of high-eccentricity migration scenarios.
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The angular momentum averaged over an eccentricity cycle is roughly conserved throughout tidal evolution.
“However, the angular momentum averaged over an eccentricity cycle is roughly conserved throughout tidal evolution (e.g., as argued by Socrates et al. 2012).”
From Origins of Hot Jupiters (2018) · cites this paper as Socrates et al. 2012
Section 2.4 says the minimum angular momentum during an eccentricity cycle remains roughly fixed during migration, while the mean becomes constant once the oscillations are quenched. Section 2.1 uses constant angular momentum as a migration assumption. Neither establishes that cycle-averaged angular momentum is roughly conserved throughout tidal evolution. (LLM, conf=0.88)
Experimental — accuracy not yet measuredSocrates et al. (2012) proposed that regardless of the mechanism of eccentricity excitation, we can test the origins theory of high eccentricity migration by searching for proto-hot Jupiters on highly elliptical orbits.
“Socrates et al. (2012) proposed that regardless of the mechanism of eccentricity excitation, we can test the origins theory of high eccentricity migration by searching for proto-hot Jupiters on highly elliptical orbits.”
From Origins of Hot Jupiters (2018) · cites this paper as Socrates et al. (2012)
Socrates et al. (2012) found that the tidal efficiency of hot Jupiters must be at least 10 times higher than the tidal efficiency of our own Solar System's Jupiter.
“Socrates et al. (2012) found that the tidal efficiency of hot Jupiters must be at least 10 times higher than the tidal efficiency of our own Solar System's Jupiter.”
From Origins of Hot Jupiters (2018) · cites this paper as Socrates et al. (2012)
Section 2.3, “Orbital Evolution: Exact Treatment” (page unavailable), mentions tidal Q for the Jupiter–Io system but does not compare it with hot Jupiters’ tidal efficiency. The Summary and Discussion addresses tidal dissipation in migrating planets without stating a tenfold difference. Searches for that comparison and for stronger dissipation found no supporting passage in our copy. (LLM, conf=0.75)
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Cited by
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Dawson, R. I., & Johnson, J. A. (2018) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081817-051853 · Cited by 622 · see citing works
- Authors
- Socrates, A., Katz, B., Dong, S., & Tremaine, S.
- Affiliations
- Institute for Advanced Study (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2012-04-20
- Volume
- 750
- Issue
- 2
- Pages
- 106
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2055915026
- Cited by
- 117
- References
- 0
- Citations by year
- 2026: 5 · 2025: 3 · 2024: 7 · 2023: 8 · 2022: 2 · 2021: 6 · 2020: 3 · 2019: 8 · 2018: 23 · 2017: 6 · 2016: 6 · 2015: 4 · 2014: 9 · 2013: 11 · 2012: 13
- FWCI
- 6.48
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Smithsonian Institution (NAS8-03060)
- National Aeronautics and Space Administration (NAS803060, NNX08AH83G)
- California Institute of Technology
- Smithsonian Astrophysical Observatory (03060, NAS8-03060)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- hot Jupiters, high-eccentricity migration, tidal circularization, tidal dissipation, periastron passage, planet formation, Kepler mission
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