New debris-disk candidates: 24 Micron stellar excesses at 100 million years

Nadya Gorlova, Deborah L. Padgett, George H. Rieke, James Muzerolle, Jane E. Morrison, Karl D. Gordon, Chad W. Engelbracht, Dean C. Hines, Joannah L Hinz, Alberto Noriega-Crespo, Luisa Rebull, John A. Stansberry, Karl R. Stapelfeldt, Kate Yu-Ling Su, Erick T. Young

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Sixty-three members of the 100 Myr old open cluster M47 (NGC 2422) have been detected at 24 μm with the Spitzer Space Telescope. The Be star V 378 Pup shows an excess both in the near-infrared and at 24 μm (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 K1 V star with K - [24] = 1.08 ± 0.11, and P1121, an F9 V star with K - [24] = 3.72 ± 0.02. P1121 is the first known main-sequence star showing an excess comparable to that of β 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 timescales estimated for the clearing of the solar system.

Original languageEnglish (US)
Pages (from-to)448-452
Number of pages5
JournalAstrophysical Journal, Supplement Series
Volume154
Issue number1
DOIs
StatePublished - Sep 2004

Keywords

  • Infrared: stars
  • Open clusters and associations: individual (M47)
  • Planetary systems: protoplanetary disks

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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