Dynamically Hot Super-Earths from Outer Giant Planet Scattering

Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Petrovich, Cristobal and Deibert, Emily (2017) Dynamically Hot Super-Earths from Outer Giant Planet Scattering. The Astronomical Journal, 153 (5):210. pp. 1-12. ISSN 0004-6256

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The hundreds of multiple planetary systems discovered by the Kepler mission are typically observed to reside in close-in (≲ 0.5 AU), low-eccentricity, low-inclination orbits. We run N-body experiments to study the effect that unstable outer (≳ 1 AU) giant planets, whose end orbital configurations resemble those in the Radial Velocity population, have on these close-in multiple super-Earth systems. Our experiments show that the giant planets greatly reduce the multiplicity of the inner super-Earths, and the surviving population can have large eccentricities (e≳ 0.3) and inclinations (I≳ 20^\circ ) at levels that anti-correlate with multiplicity. Consequently, this model predicts the existence of a population of dynamically hot single-transiting planets with typical eccentricities and inclinations of ∼0.1-0.5 and ∼10°-40°. We show that these results can explain the following observations: (I) the recent eccentricity measurements of Kepler super-Earths from transit durations; (II) the tentative observation that single-transiting systems have a wider distribution of stellar obliquity angles compared to the multiple-transiting systems; (III) the architecture of some eccentric super-Earths discovered by Radial Velocity surveys such as HD 125612c. Future observations from TESS will reveal many more dynamically hot single transiting planets, for which follow up radial velocity studies will be able to test our models and see whether they have outer giant planets.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 01 Apr 2022 00:23
Last Modified: 28 Apr 2022 03:34
Uncontrolled Keywords: planets and satellites: dynamical evolution and stability; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aa67fb
URI: http://eprints.usq.edu.au/id/eprint/47410

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