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Got ‘Em! An Eccentric, Long-Period Giant Sheds Light on Planet Migration

17 Aug 2021, 16:00 UTC
Got ‘Em! An Eccentric, Long-Period Giant Sheds Light on Planet Migration
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Editor’s note: Astrobites is a graduate-student-run organization that digests astrophysical literature for undergraduate students. As part of the partnership between the AAS and astrobites, we occasionally repost astrobites content here at AAS Nova. We hope you enjoy this post from astrobites; the original can be viewed at astrobites.org.
Title: Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Year, Highly Eccentric Orbit
Authors: P. A. Dalba et al.
First Author’s Institution: University of California Santa Cruz
Status: Accepted to AJ

Astronomers have discovered a giant, eccentric exoplanet that orbits its star once every three Earth years. The best part is: we can measure both its radius and its mass!
Guided by Giants
Over the past few decades, astronomers have determined that giant planets are imperative to the formation and evolution of planetary systems. In particular, the migration of giant planets is a driving factor in organizing the architecture of exoplanetary systems (check out this astrobite to learn more about planetary migration).
Astronomers have established two mechanisms for the migration of giant planets: 1) disk-driven migration, and 2) high-eccentricity migration (HEM). While disk-driven migration is caused by torques from the protoplanetary disk, ...

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