Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112402c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #124.02; Bulletin of the American Astronomical Society, Vol. 39, p.954
Other
Scientific paper
Studying circumstellar disk evolution and planet formation around other stars provides a context for the formation and the uniquness of the Earth and the Solar System. I summarize results from my comprehensive, multiwavelength survey of the massive double cluster, h and chi Persei, which constrain the evolution of circumstellar disks and observable signatures of planet formation. Spitzer IRAC/MIPS observations of disks surrounding h and chi Per stars exhibit a stellar mass/spectral type-dependent frequency of warm dust emission, consistent with the planet formation process finishing faster (slower) for high (intermediate/low) mass stars. The wavelength-dependent frequency of circumstellar dust emission at 2--24 microns is also consistent with an inside-out evolution of planet formation. Detailed modeling of the IRAC/MIPS colors and broadband spectral energy distributions demonstrates that many sources with IRAC excess are warm (250-400 K) debris disks, which more than doubles the number of known stars with dust emission characteristic of terrestrial planet formation. Many sources with much colder dust (50-200 K) indicate that disks around 10--15 Myr old stars have a large range of dust properties. Finally, I compare results for h and chi Persei with the magnitude of IR excess emission for other 5 Myr - 1 Gyr debris disks to provide a more complete picture of the evolution of debris emission from planet formation. The 24 micron excess from debris disks 'rises' from 5 to 10 Myr, peaks from 10 - 20 Myr and 'falls' from 20 Myr onwards.
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