Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..243p&link_type=abstract
Spitzer Proposal ID #243
Physics
Scientific paper
We propose to use 1 hour of Spitzer Director's Discretionary Time to perform follow-up high-resolution spectroscopy of the nearby main-sequence star HD 216803 and its disk. HD 216803 was observed as part of our 10 FEPS first-look sources to characterize the dissipation timescale in disks around solar-type stars. From a detailed analysis of its high-resolution Spitzer spectrum, we tentatively discovered [FeI] emission at 24 micron. Here, we propose to obtain more sensitive exposures with the LH module of the IRS to confirm this probable detection. The detection, if confirmed by the proposed DDT observations, will provide the first strong evidence for the existence of gas in the disk surrounding a main-sequence star at an age of about 100 Myr. This finding will have strong implications on planet formation models, favoring the core accretion over the gravitational instability scenario, and provides us with a powerful new tool for detecting gas in circumstellar disks. Thus, confirmation of this result is urgently needed. Because of the interest in these observations from the broader scientific community and of the implications that such a finding will have on the analysis of current data and planning of future GO proposals, we believe that the observations cannot be deferred until the next GO cycle. Therefore we ask for Director's Discretionary Time to re-observe our target in May. If these observations were delayed to Cycle 3, general observers would not have access to the results before Cycle 4, about two years from now.
Gorti Uma
Hollenbach Dave
Kim Serena
Meyer Michael R.
Morris Pat
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