Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9862k&link_type=abstract
HST Proposal ID #9862
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9862 Ism And Circumstellar Matter
Scientific paper
The first visible light coronagraph on HST provides contrast ratios near very bright stars that are unparalleled by ground-based observations. Vega, Fomalhaut and Beta Pictoris have dusty debris disks with structure thought to originate from the presence of yet-undetected, substellar companions. The detection of substellar companions is possible with the ACS HRC coronagraph if observations are made in two epochs. Here we propose to image Vega in two epochs within Cycle 12. We argue that in a few months interval, the sky plane motion of any companions due to parallax and proper motion is large relative to the HRC astrometric uncertainties. Likewise, we propose to obtain a second epoch image of Beta Pic and Fomalhaut within Cycle 12 to complement the single epoch imaging of the GTO program. Because Vega, Fomalhaut and Beta Pictoris are young and nearby, this imaging campaign will be sensitive to brown dwarfs and massive extrasolar giant planets at their predicted locations 40-60 AU projected radius from each star. Either positive or negative results for each system will be used to constrain the physical characteristics of massive objects hypothesized to cause the observed disk asymmetries.
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