Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

作者：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

来源：Monthly Notices of the Royal Astronomical Society, 2015, 447(4): 3218-3226.

DOI：10.1093/mnras/stu2721

• binaries: close
• brown dwarfs
• white dwarfs

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 K-s in the near-IR and [3.6], [4.5], [5.8] and [8.0] mu m in the mid-IR. The photometry and light curves show variability in all wavebands, with the amplitude peaking at [4.5] mu m, 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 K-s and [4.5] mu m bands when compared to models of irradiated brown dwarfs with full energy circulation and suggest this overluminosity may be attributed to H-2 fluorescence or H-3(+) being generated in the atmosphere by the UV irradiation.

• 出版日期2015-3-11