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A Deep Radio Limit for the TRAPPIST-1 System

Pineda, J. Sebastian and Hallinan, Gregg (2018) A Deep Radio Limit for the TRAPPIST-1 System. Astrophysical Journal, 866 (2). Art. No. 155. ISSN 1538-4357. http://resolver.caltech.edu/CaltechAUTHORS:20181024-143503247

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Abstract

The first nearby very-low-mass star–planet-host discovered, TRAPPIST-1, presents not only a unique opportunity for studying a system of multiple terrestrial planets, but a means to probe magnetospheric interactions between a star at the end of the main sequence and its close-in satellites. This encompasses both the possibility of persistent coronal solar-like activity, despite cool atmospheric temperatures, and the presence of large-scale magnetospheric currents, similar to what is seen in the Jovian system. Significantly, the current systems include a crucial role for close-in planetary satellites analogous to the role played by the Galilean satellites around Jupiter. We present the first radio observations of the seven-planet TRAPPIST-1 system using the Karl G. Jansky Very Large Array, looking for both highly circularly polarized radio emission and/or persistent quiescent emissions. We measure a broadband upper flux density limit of <8.1 μJy across 4–8 GHz, and place these observations both in the context of expectations for stellar radio emission, and the possible electrodynamic engines driving strong radio emissions in very-low-mass stars and brown dwarfs, with implications for future radio surveys of TRAPPIST-1 like planet-hosts. We conclude that the magnetic activity of TRAPPIST-1 is predominantly coronal and does not behave like the strong radio emitters at the stellar/substellar boundary. We further discuss the potential importance of magnetic field topology and rotation rates, demonstrating that a TRAPPIST-1 like planetary system around a rapidly rotating very-low-mass star can generate emission consistent with the observed radio luminosities of very-low-mass stars and brown dwarfs.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aae078DOIArticle
https://arxiv.org/abs/1806.00480arXivDiscussion Paper
ORCID:
AuthorORCID
Pineda, J. Sebastian0000-0002-4489-0135
Hallinan, Gregg0000-0002-7083-4049
Additional Information:© 2018 The American Astronomical Society. Received 2018 June 1; revised 2018 September 6; accepted 2018 September 6; published 2018 October 24. J.S.P. would like to thank Kevin France, Zach Berta-Thompson, and Jackie Villadsen for helpful comments in the preparation of this manuscript. G.H. acknowledges the generous support of NSF Career award AST-1654815. The authors would also like to thank the anonymous referee for the thoughtful consideration of this manuscript and for providing comments that strengthened this article. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. Software: Aladin (Bonnarel et al. 2000), CASA (McMullin et al. 2007).
Funders:
Funding AgencyGrant Number
NSFAST-1654815
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:brown dwarfs – planets and satellites: aurorae – stars: activity – stars: individual (TRAPPIST-1)
Record Number:CaltechAUTHORS:20181024-143503247
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181024-143503247
Official Citation:J. Sebastian Pineda and Gregg Hallinan 2018 ApJ 866 155
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90402
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Oct 2018 17:04
Last Modified:25 Oct 2018 17:04

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