The direct detection of the irradiated brown dwarf in the white dwarf-brown dwarf binary SDSS J141126.20+200911.1

S. L. Casewell, S. P. Littlefair, S. G. Parsons, T. R. Marsh, J. J. Fortney, M. S. Marley

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We have observed the eclipsing, post-common envelope white dwarf-brown dwarf binary, SDSS141126.20+200911.1, in the near-IR with the HAWK-I imager, and present here the first direct detection of the dark side of an irradiated brown dwarf in the H band, and a tentative detection in the Ks band. Our analysis of the light curves indicates that the brown dwarf is likely to have an effective temperature of 1300 K, which is not consistent with the effective temperature of 800Ksuggested by its mass and radius.As the brown dwarf is already absorbing almost all the white dwarf emission in the Ks band, we suggest that this inconsistency may be due to the UV-irradiation from the white dwarf inducing an artificial brightening in the Ks band, similar to that seen for the similar system WD0137-349B, suggesting this brightening may be characteristic of these UV-irradiated binaries.

Original languageEnglish (US)
Pages (from-to)5216-5222
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume481
Issue number4
DOIs
StatePublished - Dec 1 2018
Externally publishedYes

Keywords

  • Binaries: eclipsing
  • Brown dwarf
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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