INFLATING HOT JUPITERS WITH OHMIC DISSIPATION
Open accessAbstract
We present a new, magnetohydrodynamic mechanism for inflation of close-in giant extrasolar planets. The idea behind the mechanism is that current, which is induced through interaction of atmospheric winds and the planetary magnetic field, results in significant Ohmic dissipation of energy in the interior. We develop an analytical model for computation of interior Ohmic dissipation, with a simplified treatment of the atmosphere. We apply our model to HD209458b, Tres-4b, and HD189733b. With conservative assumptions for wind speed and field strength, our model predicts a generated power that appears to be large enough to maintain the transit radii, opening an unexplored avenue toward solving a decade-old puzzle of extrasolar gas giant radius anomalies.
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Heating mechanisms that decay with depth, such as ohmic dissipation, have extremely long re-inflation timescales and are unable to re-inflate a Jupiter within the star's lifetime if it cools before arrival.
“An important caveat is that heating mechanisms that decay with depth, such as the commonly invoked stellar irradiation deposition mechanism of ohmic dissipation (e.g., Batygin & Stevenson 2010), have extremely long re-inflation timescales and are unable to re-inflate a Jupiter within the star's lifetime if it cools before arrival (e.g., Ginzburg & Sari 2016; see also Wu & Lithwick 2013”
From Origins of Hot Jupiters (2018) · cites this paper as Batygin & Stevenson 2010
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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
- Batygin, K., & Stevenson, D. J.
- Affiliations
- California Institute of Technology (US)
- Corresponding author
- Batygin, Konstantin
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2010-04-15
- Volume
- 714
- Issue
- 2
- Pages
- L238-L243
- ISSN
- 2041-8205 (ISSN-L)
- 2041-8213
- OpenAlex
- W2078389780
- Cited by
- 280
- References
- 1
- Citations by year
- 2026: 14 · 2025: 17 · 2024: 19 · 2023: 14 · 2022: 19 · 2021: 7 · 2020: 19 · 2019: 10 · 2018: 19 · 2017: 12 · 2016: 22 · 2015: 12 · 2014: 17 · 2013: 20 · 2012: 24
- FWCI
- 14.12
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal Letters (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- 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 › History and Developments in Astronomy
- Keywords
- hot Jupiters, Joule heating, magnetohydrodynamics, planetary magnetic fields, induced current, atmospheric winds, HD 209458b, HD 189733b
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