Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932704m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #327.04
Astronomy and Astrophysics
Astronomy
Scientific paper
To improve our understanding of circumstellar disk evolution, and hence constraints on planet formation, I have carried out a survey for gas and dust emission around stars in the 5 Myr Upper Scorpius group. Using deep millimeter photometry from the IRAM 30m telescope, I have found the dust mass distribution of these stars; only 4% of Upper Scorpius K and M stars have millimeter dust masses of 4×10-3 Jupiter masses or greater, and no B or A stars retain dust above debris levels. Using JCMT CO observations and atomic gas line observations with the Herschel Space Observatory (as part of the Gas in Protoplanetary Systems key project), I have found an even lower fraction of disks bear detectable gas. I also present millimeter interferometry of the sole known transition disk in Upper Scorpius, with a discussion of its potential depletion mechanisms. By comparison to the large fraction of Kepler targets with Neptune size planets, these findings suggest that the process of giant planet formation must be well advanced in Upper Scorpius.
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