Changed to F122M filter for HD12039
Slight change in target position for TWA 13
HD53143 replaces HBC 427 (which replaced MML 17)
----- Submission 1 (Tue May 23 18:51:37 GMT 2006) -----
Phase II Proposal 10810 (phase2-h2cont_v2) successfully submitted.
----- Submission 2 (Tue May 23 19:39:14 GMT 2006) -----
----- Submission 3 (Mon Sep 04 01:26:44 GMT 2006) -----
----- Submission 4 (Thu Sep 07 01:07:42 GMT 2006) -----
----- Submission 5 (Tue Sep 19 16:15:15 GMT 2006) -----
Phase II Proposal 10810 (apt_10810_final) successfully submitted.
----- Submission 6 (Tue Sep 19 16:15:33 GMT 2006) -----
Assigned ID: 510
----- Submission 1 (Fri Jan 27 22:58:55 GMT 2006) -----
----- Submission 2 (Sun Jan 29 19:26:09 GMT 2006) -----
The Gas Dissipation Timescale: Constraining Models of Planet Formation
We propose to constrain planet-formation models by searching for molecular hydrogen emission around young (10-50 Myr) solar-type stars that have evidence for evolved dust disks. Planet formation models show that the presence of gas in disks is crucial to the formation of BOTH giant and terrestrial planets, influences dust dynamics, and through tidal interactions with giant planets leads to orbital migration. However, there is a lack of systematic information on the presence and lifetime of gas residing at planet-forming radii.
We will use a newly identified broad continuum emission feature of molecular hydrogen at 1600 Angstrom to search for residual gas within an orbital radius of 5-10 AU around young stars that have evolved beyond the optically thick T Tauri phase. These observations will enable the most sensitive probe to date of remant gas in circumstellar disks, detecting surfaces densites of ~0.0001 g/cm^2, or less than 10^-5 of the theoretical "mininum mass" solar nebula from which our solar system is thought to have formed. Our observations are designed to be synergistic with ongoing searches for gas emission that is being performed using the Spitzer Space Telescope in that the proposed HST observations are ~100 times more sensitive and will have 50 times higher angular resolution. These combined studies will provide the most comprehensive view of residual gas in proto-planetary disks and can set important constraints on models of planet formation.
A ACS prism observation is being made of 10 young stellar objects to search for an emission feature at 1600 angstrom. The spectral element is the PR130L being used with the SBC on the ACS. A single observation of an orbit in length are scheduled for each target. A pair of short observations is also scheduled, as these are needed for wavelength calibration. The pair of short images are being taken with the F125LP/F140LP/F150LP filters on the SBC/ACS, as this is the closest match in spectral properties to the PR130L and the source emission.
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