SIMBAD references

2020MNRAS.499.5318C - Mon. Not. R. Astron. Soc., 499, 5318-5324 (2020/December-3)

NLTT5306B: an inflated, weakly irradiated brown dwarf.

CASEWELL S.L., DEBES J., BRAKER I.P., CUSHING M.C., MACE G., MARLEY M.S. and KIRKPATRICK J.D.

Abstract (from CDS):

We present Spitzer observations at 3.6 and 4.5 um 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.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: close - brown dwarfs - white dwarfs

Simbad objects: 16

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2022.10.01-14:40:28

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