S.L. Casewell
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.
Authors
K.A. Lawrie
Pierre Maxted p.maxted@keele.ac.uk
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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