New debris disk candidates: 24 micron stellar excesses at 100 myr
Jun, 200414 pages
Published in:
- Astrophys.J.Suppl. 154 (2004) 448
e-Print:
- astro-ph/0406041 [astro-ph]
DOI:
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Abstract: (arXiv)
Sixty three members of the 100 Myr old open cluster M47 (NGC 2422) have been detected at 24 micron with Spitzer. The Be star V 378 Pup shows an excess both in the near-infrared and at 24 micron (K-[24] = 2.4 mag), probably due to free-free emission from the gaseous envelope. Seven other early-type stars show smaller excesses, K-[24] = 0.6-0.9. Among late-type stars, two show large excesses: P922 - a K1V star with K-[24] = 1.08 pm 0.11 and P1121 - an F9V star with K-[24] = 3.72 pm 0.02. P1121 is the first known main-sequence star showing an excess comparable to that of beta Pic, which may indicate the presence of an exceptionally massive debris disk. It is possible that a major planetesimal collision has occurred in this system, consistent with the few hundred Myr time scales estimated for the clearing of the Solar System.- INFRARED STARS
- PROTOPLANETARY DISKS
- OPEN CLUSTERS
- ASSOCIATIONS
- M47
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