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Astrophysics Colloquium

Ultra-Short Period Planets, Magnetospheric Truncation, Tidal Inspiral, and Stellar Evolution
Presented by Eve Lee
California Institute of Technology

Thursday, January 11, 2018
11:00 A.M. in 169-336

Sub-Neptunes around FGKM dwarfs are evenly distributed in log period down to ~10 days but dwindle in number at shorter orbital periods. We demonstrate how magnetospheric truncation of disks and tidal inspiral of planets are responsible for sculpting this orbital architecture. Both the break at ~10 days and the slope of the occurrence rate down to ~1 day can be reproduced if planets form in disks that are truncated by their host star magnetospheres at co-rotation. Asynchronous tides raised in the star can transport planets from the disk inner edge to the shortest orbital periods (<1 day). Tidal migration can explain why these ultra-short period planets (USPs) are more widely spaced than their longer period counterparts. I will also discuss how the tendency for planets to appear close-in around metal-rich stars can be understood from pre-main sequence stellar evolution.

JPL Contact: Neal Turner (3-0049)

SVCP Astrophysics

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