A Search for AU Mics out to 50pc

Details A Search for AU Mics out to 50pc A Search for AU Mics out to 50pc

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40431r&link_type=abstract

Spitzer Proposal ID #40431

Computer Science

Scientific paper

Among the numerous M dwarfs sampled by Spitzer in the nearest 25pc, AU Mic remains a unique M dwarf with its debris disk, infrared excess, 12Myr age, flaring, and X-ray activity (Chen et al. 2005, Plavchan et al. 2005, Kalas et al. 2005, Gautier et al., submitted). Plavchan et al. (2005) proposed that stellar wind drag can account for the apparent dearth of M dwarf debris disks. To test this hypothesis, we propose to observe 24 K6-M4.5 X-ray saturated dwarfs like AU Mic out to a median distance of 32pc, including 8 within 25pc that are absent from prior Spitzer nearby star efforts. These late-type dwarfs have ROSAT detections indicative of saturated X-ray activity (F_X>8x10^-5 ergs/cm^2/s) and are consequently likely to both be young and lack significant radial winds. For GJ 842.2 with a known sub-mm excess (Lestrade et al. 2006), we will additionally obtain low-resolution IRS spectra to constrain the disk properties. Compared to the relatively old population of nearby M dwarfs, circumstellar disks are more likely to both exist and persist around these stars.

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