NLTT5306B: an inflated, weakly irradiated brown dwarf

We present Spitzer observations at 3.6 and 4.5 microns and a near-infrared IRTF SpeX spectrum of the irradiated brown dwarf NLTT5306B. We determine that the brown dwarf has a spectral type of L5 and is likely inflated, despite the low effective temperature of the white dwarf primary star. We calcula...

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Bibliographic Details
Published in:arXiv.org 2020-10
Main Authors: Casewell, S L, Debes, J, Braker, I P, Cushing, M C, Mace, G, Marley, M S, J Davy Kirkpatrick
Format: Article
Language:English
Subjects:
Brightness temperature
Brown dwarf stars
Irradiation
Near infrared radiation
Temperature gradients
White dwarf stars
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Summary:We present Spitzer observations at 3.6 and 4.5 microns and a near-infrared IRTF SpeX spectrum of the irradiated brown dwarf NLTT5306B. We determine that the brown dwarf has a spectral type of L5 and is likely inflated, despite the low effective temperature of the white dwarf primary star. We calculate brightness temperatures in the Spitzer wavebands for both the model radius, and Roche Lobe radius of the brown dwarf, and conclude that there is very little day-night side temperature difference. We discuss various mechanisms by which NLTT5306B may be inflated, and determine that while low mass brown dwarfs (M
ISSN:2331-8422
DOI:10.48550/arxiv.2010.07398