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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 276684.0, MPI für Astronomie / Publikationen_mpia
Spitzer Space Telescope observations of G dwarfs in the Pleiades: Circumstellar debris disks at 100 Myr age
Authors:Stauffer, John R.; Rebull, Luisa M.; Carpenter, John; Hillenbrand, Lynne; Backman, Dana; Meyer, Michael; Kim, Jinyoung Serena; Silverstone, Murray; Young, Erick; Hines, Dean C.; Soderblom, David R.; Mamajek, Eric; Morris, Patrick; Bouwman, Jeroen; Strom, Stephen E.
Language:English
Date of Publication (YYYY-MM-DD):2005
Title of Journal:The Astronomical Journal
Journal Abbrev.:The Astronomical Journal
Volume:130
Start Page:1834
End Page:1844
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Fluxes and upper limits in the wavelength range from 3.6 to 70 mum from the Spitzer Space Telescope are provided for 20 solar-mass Pleiades members. One of these stars shows a probable mid-IR excess, and two others have possible excesses, presumably due to circumstellar debris disks. For the star with the largest, most secure excess flux at MIPS (Multiband Imaging Photometer for Spitzer) wavelengths, HII 1101, we derive log(Ldust/L*)~-3.8 and an estimated debris disk mass of 4.2_10-5 Mâ™_ for an assumed uniform dust grain size of 10 mum. If the stars with detected excesses are interpreted as stars with relatively recent, large collisional events producing a transient excess of small dust particles, the frequency of such disk transients is ~10% for our ~100 Myr, Pleiades G dwarf sample. For the stars without detected 24-70 mum excesses, the upper limits to their fluxes correspond to approximate 3 sigma upper limits to their disk masses of 6_10-6 Mâ™_ using the MIPS 24 mum upper limit or 2_10-4 Mâ™_ using the MIPS 70 mum limit. These upper limit disk masses (for ``warm'' and ``cold'' dust, respectively) are roughly consistent with, but somewhat lower than, predictions of a heuristic model for the evolution of an ``average'' solar-mass star's debris disk based on extrapolation backward in time from current properties of the Sun's Kuiper Belt.
Free Keywords:Galaxy: Open Clusters and Associations: Individual: Name: Pleiades; Stars: Low- Mass; Brown Dwarfs
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph- bib_query?b... [ID No:1]
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