New M Dwarf Debris Disk Candidates in NGC 2547

Jan Forbrich, Charles J. Lada, August A. Muench, Paula S. Teixeira

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21 Citations (Scopus)

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.
Original languageEnglish
JournalAstrophysical Journal
Volume687
Issue number2
DOIs
Publication statusPublished - 1 Nov 2008

Keywords

  • circumstellar matter
  • infrared: stars
  • open clusters and associations: individual: NGC 2547
  • planetary systems: formation

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