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

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

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 (US)
Pages (from-to)3218-3226
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number4
DOIs
StatePublished - Mar 11 2015
Externally publishedYes

Keywords

  • Binaries: close
  • Brown dwarfs
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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