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28 March 2024
 
  » arxiv » astro-ph/0406041

 Article overview


New debris disk candidates: 24 micron stellar excesses at 100 Myr
Nadya Gorlova ; Deborah L. Padgett ; George H. Rieke ; James Muzerolle ; Jane E. Morrison ; Chad W. Engelbracht ; Karl D. Gordon ; Dean C. Hines ; Joannah C. Hinz ; Alberto Noriega-Crespo ; Luisa Rebull ; John A. Stansberry ; Karl R. Stapelfeldt ; Kate Y. L. Su ; Erick T. Young ;
Date 1 Jun 2004
Subject astro-ph
Affiliation1, 3), Joannah C. Hinz , Alberto Noriega-Crespo , Luisa Rebull , John A. Stansberry , Karl R. Stapelfeldt , Kate Y. L. Su , Erick T. Young ( Steward observatory, Spitzer Science Center, Space Science Insititue, JPL
AbstractSixty 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.
Source arXiv, astro-ph/0406041
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