Casewell, SL, Lawrie, KA, Maxted, PFL, Marley, MS, Fortney, JJ, Rimmer, PB, Littlefair, SP, Wynn, G, Burleigh, MR and Helling, C (2015) Multiwaveband photometry of the irradiated brown dwarf WD0137-349B. Monthly Notices of the Royal Astronomical Society, 447 (4). 3218 -3226. ISSN 1365-2966

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: stars, close binaries, brown dwarfs, white dwarfs
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 04 Jun 2015 11:15
Last Modified: 19 Oct 2017 15:18

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