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Near-Infrared Variability in the 2MASS Calibration Fields: A Search for Planetary Transit Candidates

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Peter Plavchan1, M. Jura2, J. Davy Kirkpatrick1, Roc M. Cutri1 and S. C. Gallagher2

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The Two Micron All Sky Survey (2MASS) photometric calibration observations cover ~6 square degrees on the sky in 35 "calibration fields", each sampled in nominal photometric conditions between 562 and 3692 times during the 4 years of the 2MASS mission. We compile a catalog of variables from the calibration observations to search for M dwarfs transited by extrasolar planets. We present our methods for measuring periodic and nonperiodic flux variability. From 7554 sources with apparent Ks magnitudes between 5.6 and 16.1, we identify 247 variables, including extragalactic variables and 23 periodic variables. We have discovered three M dwarf eclipsing systems, including two candidates for transiting extrasolar planets.

Subject headings

binaries: eclipsing; methods: statistical; stars: variables: other


Dates

Issue 1 (2008 March)

Received 2007 February 8, accepted for publication 2007 September 7



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