[NeII]: A Powerful New Probe of Dissipating Disks

Details [NeII]: A Powerful New Probe of Dissipating Disks [NeII]: A Powerful New Probe of Dissipating Disks

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40338n&link_type=abstract

Spitzer Proposal ID #40338

Physics

Scientific paper

The gas dissipation timescale of circumstellar disks provides a direct constraint on the time available for giant planet formation. As a result, measuring the lifetime of gas in the planet formation region of the disk (< 20 AU) can distinguish between core accretion and gravitational instability as the dominant pathway for giant planet formation. We therefore propose to use Spitzer IRS to probe the lifetime of gaseous disks using the [NeII] emission line. Both recent theoretical predictions and recent Spitzer spectroscopy indicate that the [NeII] line is a robust tracer of small gas column densities in the region within 20 AU and, therefore, an excellent probe of dissipating gaseous disks over the range of radii relevant to giant planet formation. The proposed measurements will allow us to place stringent constraints on the presence or absence of residual disk gas at the level of 10^(-5)-10^(-6) solar masses.

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