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Differential Rotation in Convective Envelopes: Constraints from Eclipsing Binaries

Jermyn, Adam S. and Tayar, Jamie and Fuller, Jim (2020) Differential Rotation in Convective Envelopes: Constraints from Eclipsing Binaries. Monthly Notices of the Royal Astronomical Society, 491 (1). pp. 690-707. ISSN 0035-8711. doi:10.1093/mnras/stz2983.

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Over time, tides synchronize the rotation periods of stars in a binary system to the orbital period. However, if the star exhibits differential rotation, then only a portion of it can rotate at the orbital period, so the rotation period at the surface may not match the orbital period. The difference between the rotation and orbital periods can therefore be used to infer the extent of the differential rotation. We use a simple parametrization of differential rotation in stars with convective envelopes in circular orbits to predict the difference between the surface rotation period and the orbital period. Comparing this parametrization to observed eclipsing binary systems, we find that in the surface convection zones of stars in short-period binaries there is very little radial differential rotation, with |r∂_rln Ω| < 0.02. This holds even for longer orbital periods, though it is harder to say which systems are synchronized at long periods, and larger differential rotation is degenerate with asynchronous rotation.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Jermyn, Adam S.0000-0001-5048-9973
Tayar, Jamie0000-0002-4818-7885
Fuller, Jim0000-0002-4544-0750
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 October 21. Received 2019 October 3; in original form 2019 August 14. Published: 26 October 2019. ASJ thanks the Gordon and Betty Moore Foundation (Grant No. GBMF7392) and the National Science Foundation (Grant No. NSF PHY-1748958) for supporting this work. JT acknowledges that support for this work was provided by NASA through the NASA Hubble Fellowship grant No. 51424 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. JF is thankful for support from the Gordon and Betty Moore Foundation (Grant No. GBMF7392) and from the Sloan Foundation (FG-2018-10515). This research was partially conducted during the Exostar19 program at the Kavli Institute for Theoretical Physics at UC Santa Barbara, which was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958. This work was supported by the Flatiron Institute of the Simons Foundation.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF7392
NASA Hubble Fellowship51424
Alfred P. Sloan FoundationFG-2018-10515
Flatiron InstituteUNSPECIFIED
Simons FoundationUNSPECIFIED
Subject Keywords:convection – binaries: eclipsing – stars: rotation
Issue or Number:1
Record Number:CaltechAUTHORS:20200220-102336306
Persistent URL:
Official Citation:Adam S Jermyn, Jamie Tayar, Jim Fuller, Differential rotation in convective envelopes: constraints from eclipsing binaries, Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, January 2020, Pages 690–707,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101418
Deposited By: Tony Diaz
Deposited On:20 Feb 2020 18:50
Last Modified:16 Nov 2021 18:02

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