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New Debris-Disk Candidates: 24 Micron Stellar Excesses at 100 Million years
Sixty-three members of the 100 Myr old open cluster M47 (NGC 2422) havebeen detected at 24 μm with the Spitzer Space Telescope. The Be starV 378 Pup shows an excess both in the near-infrared and at 24 μm(K-[24]=2.4 mag), probably due to free-free emission from the gaseousenvelope. Seven other early-type stars show smaller excesses,K-[24]=0.6-0.9. Among late-type stars, two show large excesses: P922, aK1 V star with K-[24]=1.08+/-0.11, and P1121, an F9 V star withK-[24]=3.72+/-0.02. P1121 is the first known main-sequence star showingan excess comparable to that of β Pic, which may indicate thepresence of an exceptionally massive debris disk. It is possible that amajor planetesimal collision has occurred in this system, consistentwith the few hundred Myr timescales estimated for the clearing of thesolar system.
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