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Planetary magnetosphere evolution around post-main-sequence stars
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Veras, Dimitri and Vidotto, Aline (2021) Planetary magnetosphere evolution around post-main-sequence stars. Monthly Notices of the Royal Astronomical Society, 506 (2). pp. 1697-1703. doi:10.1093/mnras/stab1772 ISSN 0035-8711.
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Official URL: https://doi.org/10.1093/mnras/stab1772
Abstract
Accompanying the mounting detections of planets orbiting white dwarfs and giant stars are questions about their physical history and evolution, particularly regarding detectability of their atmospheres and potential for habitability. Here we determine how the size of planetary magnetospheres evolve over time from the end of the main sequence through to the white dwarf phase due to the violent winds of red giant and asymptotic giant branch stars. By using a semianalytic prescription, we investigate the entire relevant phase space of planet type, planet orbit and stellar host mass (1 − 7 M⊙). We find that a planetary magnetosphere will always be quashed at some point during the giant branch phases unless the planet’s magnetic field strength is at least two orders of magnitude higher than Jupiter’s current value. We also show that the time variation of the stellar wind and density generates a net increase in wind ram pressure and does not allow a magnetosphere to be maintained at any time for field strengths less than 10−5 T (0.1 G). This lack of protection hints that currently potentially habitable planets orbiting white dwarfs would have been previously inhospitable.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Planets -- Magnetospheres, Stars -- Evolution, Asymptotic giant branch stars, White dwarf stars, Stars -- Magnetic fields | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 0035-8711 | ||||||||
Official Date: | September 2021 | ||||||||
Dates: |
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Volume: | 506 | ||||||||
Number: | 2 | ||||||||
Page Range: | pp. 1697-1703 | ||||||||
DOI: | 10.1093/mnras/stab1772 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Dimitri Veras, Aline A Vidotto, Planetary magnetosphere evolution around post-main-sequence stars, Monthly Notices of the Royal Astronomical Society, 2021;, stab1772, is available online at: https://doi.org/10.1093/mnras/stab1772 | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Copyright Holders: | © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | ||||||||
Date of first compliant deposit: | 22 June 2021 | ||||||||
Date of first compliant Open Access: | 6 July 2021 | ||||||||
RIOXX Funder/Project Grant: |
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