Other
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11352g&link_type=abstract
HST Proposal ID #11352. Cycle 16
Other
Scientific paper
OGLE-2007-BLG-349Lb is the seventh planet discovered using gravitational microlensing, with planet/star mass ratio 2.8e-4. These microlensing planets lie in the cold, outer reaches of their solar systems and are difficult to detect by other techniques because of their long periods. However, microlensing detections by themselves generally give only the planet/star mass ratio, not the absolute planet mass. HST observations have yielded host star masses and distances for two previous microlensing planets. Here, we propose to apply a proven technique to measure the mass and distance of the newest microlensing planet, which was discovered only two weeks ago. We will use WFPC2 observations to unambiguously determine whether the blended light seen during the event is due to the host star rather than a random interloper and a combination of WFPC2 and NICMOS observations to obtain photometric estimates of the mass and distance. Two epochs of observations are required, one at high magnification in the very near future and the other at baseline but not too late -- to avoid having the lens move substantially away from the source.;
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