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Mutual Inclination Excitation by Stellar Oblateness

Li, Gongjie and Dai, Fei and Becker, Juliette (2020) Mutual Inclination Excitation by Stellar Oblateness. Astrophysical Journal Letters, 890 (2). Art. No. L31. ISSN 2041-8213.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Li, Gongjie0000-0001-8308-0808
Dai, Fei0000-0002-8958-0683
Becker, Juliette0000-0002-7733-4522
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.
Subject Keywords:Exoplanet systems; Exoplanet dynamics
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanet systems (484); Exoplanet dynamics (490)
Record Number:CaltechAUTHORS:20200225-092549372
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Official Citation:Gongjie Li et al 2020 ApJL 890 L31
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101525
Deposited By: Tony Diaz
Deposited On:25 Feb 2020 17:59
Last Modified:25 Feb 2020 17:59

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