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|Title: ||Far-infrared properties of M dwarfs|
|Authors: ||Gautier, Thomas N. III|
Rieke, G. H.
Bryden, Geoffrey C.
Stapelfeldt, Karl R.
Werner, Michael W.
Beichman, Charles A.
Patten, Brian M.
Roellig, Thomas L.
|Keywords: ||debris disks; spitzer mips;|
|Issue Date: ||20-Sep-2007 |
|Publisher: ||UNIV CHICAGO PRESS|
|Citation: ||Astrophysical Journal, v.667, no.1, pp. 527-536|
|Abstract: ||We report the mid- and far-infrared properties of nearby M dwarfs. Spitzer/MIPS measurements were obtained for a sample of 62 stars at 24 μm, with subsamples of 41 and 20 stars observed at 70 μm and 160 μm respectively. We compare the results with current models of M star photospheres and look for indications of circumstellar dust in the form of significant deviations of K-[24 μm] colors and 70 μm / 24 μm flux ratios from the average M star values. At 24 μm, all 62 of the targets were detected; 70 μm detections were achieved for 20 targets in the subsample observed; and no detections were seen in the 160 μm subsample. No clear far-infrared excesses were detected in our sample. The average far infrared excess relative to the photospheric emission of the M stars is at least four times smaller than the similar average for a sample of solar-type stars. However,this limit allows the average fractional infrared luminosity in the M-star sample to be similar to that for more massive stars. We have also set low limits (10−4 to 10−9 MEarth depending on location) for the maximum mass of dust possible around our stars.|
|Appears in Collections:||JPL TRS 1992+|
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