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Spitzer Observations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age | J.R. Stauffer
; L. Rebull
; J. Carpenter
; L. Hillenbrand
; D. Backman
; M.R. Meyer
; J.S. Kim
; M.D. Silverstone
; E. Young
; D.C. Hines
; D.R. Soderblom
; E.E. Mamajek
; P. Morris
; J. Bouwman
; S.E. Strom
; | Date: |
29 Jun 2005 | Subject: | astro-ph | Affiliation: | Spitzer Science Center), J. Carpenter, L. Hillenbrand (Caltech), D. Backman (NASA-Ames), M.R. Meyer, J.S. Kim, M.D. Silverstone and E. Young (Steward Observatory, UofA), D.C. Hines (SSI), D.R. Soderblom (STScI), E.E. Mamajek (Harvard-Smithsonian CfA), | Abstract: | Fluxes and upper limits in the wavelength range from 3.6 to 70 microns from the Spitzer Space Telescope are provided for twenty 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 wavelengths, HII1101, we derive Log(L[dust]/L[Sun]) ~ -3.8 and an estimated debris disk mass of 4.2 x 10^-5 M(Earth) for an assumed uniform dust grain size of 10 microns If the stars with detected excesses are interpreted as stars with relatively recent, large collision events producing a transient excess of small dust particles, the frequency of such disk transients is about ~ 10 % for our ~ 100 Myr, Pleiades G dwarf sample. For the stars without detected 24-70 micron excesses, the upper limits to their fluxes correspond to approximate 3 sigma upper limits to their disk masses of 6 x 10^-6 M(Earth) using the MIPS 24 micron upper limit, or 2 x 10^-4 M(Earth) using the MIPS 70 micron limit. These upper limit disk masses (for "warm" and "cold" dust, respectively) are roughly consistent, but somewhat lower than, predictions of a heuristic model for the evolution of an "average" solar-mass star’s debris disk based on extrapolation backwards in time from current properties of the Sun’s Kuiper belt. | Source: | arXiv, astro-ph/0506743 | Services: | Forum | Review | PDF | Favorites |
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