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Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

Casewell, S.L.; Lawrie, K.A.; Maxted, P.F.L.; Marley, M.S.; Fortney, J.J.; Rimmer, P.B.; Littlefair, S.P.; Wynn, G.; Burleigh, M.R.; Helling, Ch.

Multiwaveband photometry of the irradiated brown dwarf WD0137-349B Thumbnail


Authors

S.L. Casewell

K.A. Lawrie

M.S. Marley

J.J. Fortney

P.B. Rimmer

S.P. Littlefair

G. Wynn

M.R. Burleigh

Ch. Helling



Abstract

WD0137-349 is a white dwarf–brown dwarf binary system in a 116 min orbit. We present radial velocity observations and multiwaveband photometry from V, R and I in the optical, to J, H and Ks in the near-IR and [3.6], [4.5], [5.8] and [8.0] µm in the mid-IR. The photometry and light curves show variability in all wavebands, with the amplitude peaking at [4.5] µm, where the system is also brightest. Fluxes and brightness temperatures were computed for the heated and unheated atmosphere of the brown dwarf (WD0137-349B) using synthetic spectra of the white dwarf using model atmosphere simulations. We show that the flux from the brown dwarf dayside is brighter than expected in the Ks and [4.5] µm bands when compared to models of irradiated brown dwarfs with full energy circulation and suggest this overluminosity may be attributed to H2 fluorescence or H+3 being generated in the atmosphere by the UV irradiation.

Journal Article Type Article
Acceptance Date Dec 18, 2014
Online Publication Date Jan 15, 2015
Publication Date Mar 11, 2015
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 447
Issue 4
Pages 3218 -3226
DOI https://doi.org/10.1093/mnras/stu2721
Keywords stars, close binaries, brown dwarfs, white dwarfs
Publisher URL http://dx.doi.org/10.1093/mnras/stu2721

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