Variability in SSTc2d J163134.1-240100, a brown dwarf with quasi-spherical mass loss
The Open Journal of Astrophysics(2023)
摘要
We report on a search for variability in the young brown dwarf SST1624 ( M7
spectral type, M 0.05Msol), previously found to feature an expanding gaseous
shell and to undergo quasi-spherical mass loss. We find no variability on
timescales of 1-6hours. Specifically, on these timescales, we rule out the
presence of a period with amplitude >1
would have been evidence for either pulsation powered by Deuterium burning or
rotation near breakup. However, we see a 3
between two consecutive observing nights (a 10sigma result). There is also
clear evidence for variations in the WISE lightcurves at 3.6 and 4.5 microns on
timescales of days, with a tentative period of about 6d (with a plausible range
between 3 and 7d). The best explanation for the variations over days is
rotational modulation due to spots. These results disfavour centrifugal winds
driven by fast rotation as mechanism for the mass loss, which, in turn, makes
the alternative scenario – a thermal pulse due to Deuterium burning – more
plausible.
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