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Benchmark Transiting Brown Dwarf LHS 6343 C: Spitzer Secondary Eclipse Observations Yield Brightness Temperature and Mid-T Spectral Class

Montet, Benjamin T. and Johnson, John Asher and Fortney, Jonathan J. and Desert, Jean-Michel (2016) Benchmark Transiting Brown Dwarf LHS 6343 C: Spitzer Secondary Eclipse Observations Yield Brightness Temperature and Mid-T Spectral Class. Astrophysical Journal Letters, 822 (1). Art. No. L6. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20160602-073306283

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Abstract

There are no field brown dwarf analogs with measured masses, radii, and luminosities, precluding our ability to connect the population of transiting brown dwarfs with measurable masses and radii and field brown dwarfs with measurable luminosities and atmospheric properties. LHS 6343 C, a weakly irradiated brown dwarf transiting one member of an M+M binary in the Kepler field, provides the first opportunity to probe the atmosphere of a non-inflated brown dwarf with a measured mass and radius. Here, we analyze four Spitzer observations of secondary eclipses of LHS 6343 C behind LHS 6343 A. Jointly fitting the eclipses with a Gaussian process noise model of the instrumental systematics, we measure eclipse depths of 1.06 ± 0.21 ppt at 3.6 μm and 2.09 ± 0.08 ppt at 4.5 μm, corresponding to brightness temperatures of 1026 ± 57 K and 1249 ± 36 K, respectively. We then apply brown dwarf evolutionary models to infer a bolometric luminosity log(L_*/L_☉)= -5.16 ± 0.04. Given the known physical properties of the brown dwarf and the two M dwarfs in the LHS 6343 system, these depths are consistent with models of a 1100 K T dwarf at an age of 5 Gyr and empirical observations of field T5-6 dwarfs with temperatures of 1070 ± 130 K. We investigate the possibility that the orbit of LHS 6343 C has been altered by the Kozai–Lidov mechanism and propose additional astrometric or Rossiter–McLaughlin measurements of the system to probe the dynamical history of the system.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3847/2041-8205/822/1/L6DOIArticle
http://iopscience.iop.org/article/10.3847/2041-8205/822/1/L6PublisherArticle
http://arxiv.org/abs/1603.09343arXivDiscussion Paper
ORCID:
AuthorORCID
Fortney, Jonathan J.0000-0002-9843-4354
Additional Information:© 2016 American Astronomical Society. Received 2016 January 2; revised 2016 March 28; accepted 2016 March 29; published 2016 April 22. We thank the referee, Adam Burgasser, for his thorough referee report which considerably improved the quality of this paper. We thank Drake Deming for providing an early draft of his 2015 paper and a version of the underlying code. We thank Sarah Ballard and Dan Foreman-Mackey for conversations about Spitzer data analysis and Mark Marley and Jackie Faherty for very helpful comments on an early draft of this paper which significantly improved its quality. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. B.T.M. is supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. J.A.J. is supported by generous grants from the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation. Facility: Spitzer (IRAC). - Spitzer Space Telescope satellite
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:binaries: eclipsing; brown dwarfs; stars: late-type; stars: low-mass
Record Number:CaltechAUTHORS:20160602-073306283
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160602-073306283
Official Citation:Benjamin T. Montet et al 2016 ApJ 822 L6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67564
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:02 Jun 2016 19:52
Last Modified:23 Aug 2017 21:21

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