Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6603b&link_type=abstract
HST Proposal ID #6603
Physics
Hst Proposal Id #6603 Binaries And Star Formation
Scientific paper
We will probe fundamental physical properties and structures of recently discovered, and uniquely visible, protoplanetary disks around young stars in the Orion Nebula {M42, NGC1976}. We will obtain narrow band and continuum images with the maximum possible angular resolution and use orders of magnitude deeper integrations than previously attempted. We will achieve images of protoplanetary disks with a linear resolutions of 5 to 20 A.U., a factor a 2 to 5 improvement over previous HST results. It is vital to carry out these new high resolution deep integrations because accurate determinations of absorption profiles will be fundamental in constraining models of disks and their interactions with the nebula environment. There is also the exciting possibility of detecting absorption profile ``gaps'' or rings on A.U. scales that could be direct evidence for extra-solar planets. Hence, our primary objectives are to obtain: 1 Deep PC & WFC images of a small number of selected objects {discovered in Cycle 4 & 5} which we believe to be disks seen in silhouette, or are disks in ionized envelopes, 2 Deep UV images with the FOC of pure dark objects that lie in front of the brightest portion of the Orion Nebula. 3 Proper motion determinations of fast compact nebular components. Using earlier epoch HST data, our Cycle 6 WFPC2 images will give a proper motion sensitivity {> 40 Delta t_years^-1 kms} allowing us to detect moving gas from stationary nebula gas.
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