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NLTT5306B: an inflated, weakly irradiated brown dwarf

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journal contribution
posted on 2023-04-13, 15:56 authored by SL Casewell, J Debes, IP Braker, MC Cushing, G Mace, MS Marley, J Davy Kirkpatrick
We present Spitzer observations at 3.6 and 4.5 μm 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 < 35 MJup) are easily inflated by irradiation from their host star, very few higher mass brown dwarfs are inflated. The higher mass brown dwarfs that are inflated may be inflated by magnetic interactions or may have thicker clouds.

Funding

STFC Ernest Rutherford Fellow.

History

Author affiliation

School of Physics & Astronomy, University of Leicester

Version

  • AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

499

Issue

4

Pagination

5318 - 5324

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Copyright date

2020

Available date

2023-04-13

Language

English