Open AccessTime series photometry of the nearby brown dwarf DENIS‐P J0041353−562112
Author(s) -
Koen C.
Publication year - 2011
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2010.17760.x
Subject(s) - physics , astrophysics , photometry (optics) , rotation period , brown dwarf , brightness , astronomy , asymmetry , accretion (finance) , stars , quantum mechanics
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 R C and I C 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 R C band suggests a strong magnetic field.