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

Abstract

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.

arXiv comment14 pages, 3 figures, accepted to the special Spitzer issue of the ApJS

References in corpus (7)

• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I
• Collisional Processes in Extrasolar Planetsimal Disks - Dust Clumps in Fomalhaut's Debris Disk
• Incidence and survival of remnant disks around main-sequence stars
• Dusty Debris Around Solar-Type Stars: Temporal Disk Evolution
• The age dependence of the Vega phenomenon: Observations
• Discovery of Reflection Nebulosity Around Five Vega-like Stars
• Luminosity and Mass Function of the Galactic open cluster NGC 2422

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