Properties of the Inner H2 Disks of Protoplanetary Systems

Details Properties of the Inner H2 Disks of Protoplanetary Systems Properties of the Inner H2 Disks of Protoplanetary Systems

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934411f&link_type=abstract

American Astronomical Society, AAS Meeting #219, #344.11

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a sample of 33 young (age < 12 Myr) circumstellar disk systems observed with the HST-Cosmic Origins Spectrograph. Tens to hundreds of photo-excited H2 emission lines are detected in every gas-rich classical and transitional disk. Total fluxes and velocity profiles are measured for several LyA-pumped H2 progressions in each target. The emission lines are spectrally resolved, arguing that the emitting gas is in a rotating disk at an orbital distance of less than 5 AU. We observe a decline in the amount of H2 present in the inner disk as a function of system age, however gas-rich inner disks with ages between 5 - 10 Myr are observed. Many of these sources show strong evidence for dust clearing, suggesting that the survival of remnant H2 gas in the inner 5 AU of protoplanetary systems is common.

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