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

doi:10.1093/mnras/stu2721

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

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49 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 K_s 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 K_s 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 language	English (US)
Pages (from-to)	3218-3226
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	447
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stu2721
State	Published - Mar 11 2015
Externally published	Yes

Keywords

Binaries: close
Brown dwarfs
White dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stu2721

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title = "Multiwaveband photometry of the irradiated brown dwarf WD0137-349B",

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.",

keywords = "Binaries: close, Brown dwarfs, White dwarfs",

author = "Casewell, {S. L.} and Lawrie, {K. A.} and Maxted, {P. F.L.} and Marley, {M. S.} and Fortney, {J. J.} and Rimmer, {P. B.} and Littlefair, {S. P.} and G. Wynn and Burleigh, {M. R.} and Ch Helling",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",

year = "2015",

month = mar,

day = "11",

doi = "10.1093/mnras/stu2721",

language = "English (US)",

volume = "447",

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T1 - Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

AU - Casewell, S. L.

AU - Lawrie, K. A.

AU - Maxted, P. F.L.

AU - Marley, M. S.

AU - Fortney, J. J.

AU - Rimmer, P. B.

AU - Littlefair, S. P.

AU - Wynn, G.

AU - Burleigh, M. R.

AU - Helling, Ch

PY - 2015/3/11

Y1 - 2015/3/11

N2 - 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.

AB - 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.

KW - Binaries: close

KW - Brown dwarfs

KW - White dwarfs

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

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