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Title:
New M Dwarf Debris Disk Candidates in NGC 2547
Authors:
Forbrich, Jan; Lada, Charles J.; Muench, August A.; Teixeira, Paula S.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , ), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , ), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , ), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , )
Publication:
The Astrophysical Journal, Volume 687, Issue 2, pp. 1107-1116. (ApJ Homepage)
Publication Date:
11/2008
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Infrared: Stars, Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2547, Stars: Planetary Systems: Formation
DOI:
10.1086/592035
Bibliographic Code:
2008ApJ...687.1107F

Abstract

With only six known examples, M dwarf debris disks are rare, even though M dwarfs constitute the majority of stars in the Galaxy. After finding a new M dwarf debris disk in a shallow mid-infrared observation of NGC 2547, we present a considerably deeper Spitzer MIPS image of the region, with a maximum exposure time of 15 minutes pixel-1. Among sources selected from a previously published membership list, we identify nine new M dwarfs with excess emission at 24 μm tracing warm material close to the snow line of these stars, at orbital radii of less than 1 AU. We argue that these are likely debris disks, suggesting that planet formation is under way in these systems. Interestingly, the estimated excess fraction of M stars appears to be higher than that of G and K stars in our sample.
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