3D MHD models of the centrifugal magnetosphere from a massive star with an oblique dipole field Get access Arrow

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Author(s)ud-Doula, Asif
Author(s)Owocki, Stanley P.
Author(s)Russell, Christopher
Author(s)Gagné, Marc
Author(s)Daley-Yates, Simon
Date Accessioned2023-04-13T20:45:01Z
Date Available2023-04-13T20:45:01Z
Publication Date2023-02-01
DescriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. The version of record is available at:
AbstractWe present results from new self-consistent 3D magnetohydrodynamics (MHD) simulations of the magnetospheres from massive stars with a dipole magnetic axis that has a non-zero obliquity angle (β) to the star’s rotation axis. As an initial direct application, we compare the global structure of co-rotating discs for nearly aligned (β = 5°) versus half-oblique (β = 45°) models, both with moderately rapid rotation (∼0.5 critical). We find that accumulation surfaces broadly resemble the forms predicted by the analytical rigidly rotating magnetosphere model, but the mass buildup to near the critical level for centrifugal breakout against magnetic confinement distorts the field from the imposed initial dipole. This leads to an associated warping of the accumulation surface towards the rotational equator, with the highest density concentrated in wings centred on the intersection between the magnetic and rotational equators. These MHD models can be used to synthesize rotational modulation of photometric absorption and H α emission for a direct comparison with observations.
SponsorThis work was supported in part by the National Aeronautics and Space Administration under grant no. 80NSSC22K0628 issued through the Astrophysics Theory Program. AuD and MG acknowl- edge support by the National Aeronautics and Space Administration through Chandra award numbers TM-22001 and GO2-23003X, issued by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract no. NAS8-03060. This work used the Bridges2 cluster at the Pittsburgh Supercomputer Center through allocation no. AST200002 from the Extreme Science and Engineering Disco v ery Environment (XSEDE), which was supported by National Science Foundation grant number 1548562.
CitationAsif ud-Doula, Stanley P Owocki, Christopher Russell, Marc Gagné, Simon Daley-Yates, 3D MHD models of the centrifugal magnetosphere from a massive star with an oblique dipole field, Monthly Notices of the Royal Astronomical Society, Volume 520, Issue 3, April 2023, Pages 3947–3954, https://doi.org/10.1093/mnras/stad345
ISSN1365-2966
URLhttps://udspace.udel.edu/handle/19716/32647
Languageen_US
PublisherMonthly Notices of the Royal Astronomical Society
KeywordsMHD
Keywordsstars: magnetic fields
Keywordsstars: massive
Keywordsstars: mass-loss
Keywordsstars: winds
Keywordsoutflows
Title3D MHD models of the centrifugal magnetosphere from a massive star with an oblique dipole field Get access Arrow
TypeArticle
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