Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50498h&link_type=abstract
Spitzer Proposal ID #50498
Computer Science
Scientific paper
As disk systems in which planet formation may be under way, transition objects offer the potential for unique insights on the planet formation process. For transition objects with known stellar ages, determining if these systems are forming planets and what stage of planet formation they are in can place fundamental constraints on planet formation timescales. The nature of transition objects is, in fact, controversial. Their SEDs, which probe the radial distribution of dust in the disk, have been variously explained as the result of disk photoevaporation, grain growth, or the formation of a Jovian or larger mass planet. Complementary information, such as the radial distribution of the gaseous disk, can distinguish between these possibilities. We therefore propose IRS spectroscopy that will characterize the gaseous disks of transition objects. Our proposal capitalizes on recent Spitzer results which demonstrate dramatic progress in our ability to probe the gaseous component of disks. By comparing the molecular line emission properties of transition objects with those of a comparison sample of T Tauri stars, we will probe empirically the evolutionary state of these systems.
Carr John
Espaillat Catherine
Furlan Elise
Houck James R.
Najita Joan
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