Multiwaveband photometry of the irradiated brown dwarf WD0137-349B
| Autor: | 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. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stu2721 |
| Popis: | WD0137-349 is a white dwarf-brown dwarf binary system in a 116 minute 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] microns in the mid-IR. The photometry and lightcurves show variability in all wavebands, with the amplitude peaking at [4.5] microns, 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] micron bands when compared to models of irradiated brown dwarfs with full energy circulation and suggest this over-luminosity may be attributed to H2 fluorescence or H3+ being generated in the atmosphere by the UV irradiation. Comment: 9 pages, 9 figures, 5 tables. Accepted for publication in MNRAS |
| Databáze: | arXiv |
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