Multi-year Near Infrared Variability Study Of L- And T-dwarfs

Details Multi-year Near Infrared Variability Study Of L- And T-dwarfs Multi-year Near Infrared Variability Study Of L- And T-dwarfs

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542425v&link_type=abstract

American Astronomical Society, AAS Meeting #215, #424.25; Bulletin of the American Astronomical Society, Vol. 42, p.334

Astronomy and Astrophysics

Astronomy

Scientific paper

Between 2000 and 2006 NOFS carried out an extensive program of near infrared astrometry of L- and T-dwarfs. Observations were carried out primarily in H-band for L dwarfs and J-band for T dwarfs. The observing cadence was such that, weather permiting, each available program object was observed near the local meridian on multiple nights during each two week bright time observing run. These observations, while primarily designed for astrometric measures, can also been used to study potential brown dwarf variability on time scales ranging from days to several years, which we report here. We present photometric results for 27 L-dwarfs and 28 T-dwarfs (62 total objects including those in binaries). These observations represent approximately 1850 hours of integration time on the 61-inch Kaj Strand Astrometric Reflector. An object was visited on average 62 individual nights with approximately 30 hours of integration time. Only 6 objects were observed for less than 40 nights. Local standards and at least two check stars were set up in each field. The total photometric error budget ranged from less than 0.01 mag for J,H < 14.5 mag, steadily increasing to 0.05 mag for J,H = 17.0 mag. We found no statistically significant variablity for any L- or T-dwarf studied, within the limits of the above error budget. We did find one check star with approximately 0.04 mag variability which appears to be an early M-dwarf, based on its infrared colors. We conclude that L- and T-dwarfs studied do not undergo surface or luminosity changes detectable in the near infrared at the few percent level on time scales of days to several years.

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