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Asteroseismology can reveal strong internal magnetic fields in red giant stars

Fuller, Jim and Cantiello, Matteo and Stello, Dennis and Garcia, Raphael and Bildsten, Lars (2015) Asteroseismology can reveal strong internal magnetic fields in red giant stars. Science, 350 (6259). pp. 423-426. ISSN 0036-8075. doi:10.1126/science.aac6933.

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Internal stellar magnetic fields are inaccessible to direct observations, and little is known about their amplitude, geometry, and evolution. We demonstrate that strong magnetic fields in the cores of red giant stars can be identified with asteroseismology. The fields can manifest themselves via depressed dipole stellar oscillation modes, arising from a magnetic greenhouse effect that scatters and traps oscillation-mode energy within the core of the star. The Kepler satellite has observed a few dozen red giants with depressed dipole modes, which we interpret as stars with strongly magnetized cores. We find that field strengths larger than ~10^5 gauss may produce the observed depression, and in one case we infer a minimum core field strength of ≈10^7 gauss.

Item Type:Article
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URLURL TypeDescription Materials
Fuller, Jim0000-0002-4544-0750
Cantiello, Matteo0000-0002-8171-8596
Additional Information:© 2015 American Association for the Advancement of Science. Received for publication 29 May 2015. Accepted for publication 15 September 2015. The authors of this paper thank the Kavli Institute for Theoretical Physics and the organizers of the Galactic Archaeology and Precision Stellar Astrophysics program held from January to April 2015. J.F. acknowledges partial support from NSF under grant no. AST-1205732 and through a Lee DuBridge Fellowship at the California Instiute of Technology. R.A.G. acknowledge the support of the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 312844 (SPACEINN), and from the Centre National d’Études Spatiales. D.S. acknowledges support from the Australian Research Council. This project was supported by NASA under Theory and Computational Astrophysics Network grant no. NNX14AB53G and NSF under grants PHY 11-25915 and AST 11-09174.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Lee A. DuBridge FoundationUNSPECIFIED
European Research Council (ERC)312844 (SPACEINN)
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
NSFPHY 11-25915
NSFAST 11-09174
Issue or Number:6259
Record Number:CaltechAUTHORS:20151022-113422297
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Official Citation:Asteroseismology can reveal strong internal magnetic fields in red giant stars Jim Fuller, Matteo Cantiello, Dennis Stello, Rafael A. Garcia, and Lars Bildsten Science 23 October 2015: 350 (6259), 423-426. [DOI:10.1126/science.aac6933]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61419
Deposited By: George Porter
Deposited On:22 Oct 2015 18:50
Last Modified:10 Nov 2021 22:48

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