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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 | Affiliation: | 1, 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 | 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. | Source: | arXiv, astro-ph/0406041 | Services: | Forum | Review | PDF | Favorites |
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