Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

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 H3 + being generated in the atmosphere by the UV irradiation.

Original languageEnglish
Pages (from-to)3218-3226
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number4
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Binaries: close
  • Brown dwarfs
  • White dwarfs

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