Time series photometry of the nearby brown dwarf DENIS-P J0041353-562112
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Date
2011
Authors
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Publisher
Oxford University Press
Abstract
DENIS-P J0041353−562112 is a brown dwarf, with a spectral type of M7.5, which may be
younger than 20 Myr. On the basis of its Hα emission-line asymmetry, it has been suggested
that the object is accreting material. If it is accreting, it is expected to rotate slowly. This paper
reports on several photometric monitoring runs in the RC and IC bands, designed to study
variability – such as that due to rotational modulation – of the object. Although there do not
seem to be irregular brightness fluctuations typical of accretion, there is cyclical variability
which may be due to a bright accretion-related spot. The rotation period is 2.8 h, although a
double-wave variation with a period of 5.6 h cannot be ruled out completely. If the shorter
period is correct, it is unlikely that the brown dwarf is disc-locked. Substantial flaring activity
in the RC band suggests a strong magnetic field.
Description
Keywords
Brown dwarf, Stars: individual, Stars: low-mass, Stars: variables: general
Citation
Koen, C. (2011). Time series photometry of the nearby brown dwarf DENIS-P J0041353-562112. Monthly Notices of the Royal Astronomical Society, 411(2):1197-1203