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Escaping Outflows from Disintegrating Exoplanets: Day-side versus Night-side Escape
Name
Kang_2021_ApJ_906_67.pdf
Description
Published version
Size
1.39 MB
Format
Adobe PDF
Checksum (MD5)
c5e8a4940f7bc71308842b6ece762a76
Author(s)
Kang, Wanying
Ding, Feng
Wordsworth, Robin
Seager, Sara
Date Issued
2021
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Version
Final published version
Abstract
Ultrahot disintegrating exoplanets have been detected with tails trailing behind and/or shooting ahead of them. These tails are believed to be made of dust that are formed out of the supersonic escaping flow that emanated from the permanent day side. Conserving angular momentum, this day-side escape flux would lead the planet in orbit. In order to explain the trailing tails in observation, radiation pressure, a repulsive force pushing the escape flow away from the host star, is considered to be necessary. We here investigate whether escape could be deflected to head away from the host star by the pressure gradient force. We demonstrate in an idealized framework that escape flux from the night side can occur, and sometimes, can be even stronger than the escape from the day-side. The night-side escape infers that escape flow could trail behind the planet in orbit by virtue of angular momentum conservation even without radiation pressure. We also find analytical approximations for both day-side and night-side escape fluxes, which may be applied to study planetary evolution of disintegrating planets.
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
10.3847/1538-4357/ABCAA7
