Mutual Inclination Excitation by Stellar Oblateness
- Creators
- Li, Gongjie
- Dai, Fei
- Becker, Juliette
Abstract
Ultra-short-period planets (USPs) provide important clues to planetary formation and migration. It was recently found that the mutual inclinations of the planetary systems are larger if the inner orbits are closer (≾5R*) and if the planetary period ratios are larger (P₂/P₁ ≳ 5). This suggests that the USPs experienced both inclination excitation and orbital shrinkage. Here we investigate the increase in the mutual inclination due to stellar oblateness. We find that the stellar oblateness (within ~1 Gyr) is sufficient to enhance the mutual inclination to explain the observed signatures. This suggests that the USPs can migrate closer to the host star in a near coplanar configuration with their planetary companions (e.g., disk migration+tides or in situ+tides), before mutual inclination gets excited due to stellar oblateness.
Additional Information
© 2020 The American Astronomical Society. Received 2019 December 25; revised 2020 January 31; accepted 2020 February 4; published 2020 February 25. The authors thank Josh Winn and the referee for helpful comments and suggestions on the manuscript.Attached Files
Published - Li_2020_ApJL_890_L31.pdf
Accepted Version - 2001.08282.pdf
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Additional details
- Eprint ID
- 101525
- Resolver ID
- CaltechAUTHORS:20200225-092549372
- Created
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2020-02-25Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field