Spitzer Observations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age

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dc.creatorStauffer, J. R.
dc.creatorRebull, L.
dc.creatorCarpenter, J.
dc.creatorHillenbrand, L.
dc.creatorBackman, D.
dc.creatorMeyer, M. R.
dc.creatorKim, J. S.
dc.creatorSilverstone, M. D.
dc.creatorYoung, E.
dc.creatorHines, D. C.
dc.creatorSoderblom, D. R.
dc.creatorMamajek, E. E.
dc.creatorMorris, P.
dc.creatorBouwman, J.
dc.creatorStrom, S. E.
dc.date2005-06-29
dc.date.accessioned2026-07-07T11:24:32Z
dc.date.available2026-07-07T11:24:32Z
dc.descriptionFluxes 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.
dc.description32 postscript pages including 8 figues and 3 tables. To appear in the Astronomical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0506743
dc.identifierhttp://arxiv.org/abs/astro-ph/0506743
dc.identifierAstron.J.130:1834-1844,2005
dc.identifierdoi:10.1086/444420
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195226
dc.subjectAstrophysics
dc.titleSpitzer Observations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age
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