M Dwarf Photometric Variability In The Optical And NIR

Details M Dwarf Photometric Variability In The Optical And NIR M Dwarf Photometric Variability In The Optical And NIR

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832603d&link_type=abstract

American Astronomical Society, AAS Meeting #218, #326.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present limits on the observability of stochastic flare events from M dwarfs in SDSS and 2MASS filters. We have studied 30,000 M dwarfs from the SDSS Stripe 82 time-domain catalog, and 4300 M dwarfs from the 2MASS Calibration Scan Point Source Working Database which overlap the SDSS DR7 single-epoch data. M dwarfs are chosen based on their SDSS r,i,z colors. Stripe 82 stars each have 50-100 epochs of data, while 2MASS Calibration stars have 2000-3000. An M dwarf continuum spectral model is used to predict observed flare signatures in each band. From these data we estimate the observed rates and theoretical detection thresholds for flares in eight photometric bands as a function of spectral type. The structure function of the variability for each spectral type bin is also calculated for all eight bands. These rates of flares and photometric variations at longer wavelengths will be important for predicting the impact of M dwarf variability in next-generation instruments such as JWST.

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