New debris disk candidates: 24 micron stellar excesses at 100 Myr

Details New debris disk candidates: 24 micron stellar excesses at 100 Myr New debris disk candidates: 24 micron stellar excesses at 100 Myr

2004-06-01

arxiv.org/abs/astro-ph/0406041v1

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted to the special Spitzer issue of the ApJS

Scientific paper

10.1086/422822

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.

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