Spitzer Space Telescope Observations of the Pleiades: Debris Disks and Brown Dwarfs

Details Spitzer Space Telescope Observations of the Pleiades: Debris Disks and Brown Dwarfs Spitzer Space Telescope Observations of the Pleiades: Debris Disks and Brown Dwarfs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.6311s&link_type=abstract

American Astronomical Society Meeting 207, #63.11; Bulletin of the American Astronomical Society, Vol. 37, p.1248

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Scientific paper

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 as part of the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy program.. 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(Ldust/L*) ˜ -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.
We also have obtained deep IRAC imaging of a portion of the Pleiades in order to search for very low mass members. We will report initial analysis of that dataset.

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