Mathematics – Probability
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10707g&link_type=abstract
HST Proposal ID #10707
Mathematics
Probability
Hst Proposal Id #10707
Scientific paper
We will use ACS to determine the mass of the extra-solar planet found in the ongoing microlensing event OGLE-2005-BLG-071. This source will be imaged in V {F555W} and I {F814W} at two epochs, one "very soon" while the event is still significantly magnified, and the other after 5 months when it has returned to baseline. If the centroid does not move, this will demonstrate that the "blended light" detected in the event is "perfectly aligned" {within 15 mas, 1 sigma} with the source, and so is almost certainly the lens. V and I photometry will then permit an estimate of its mass and distance. Since the planet-star mass ratio is already known to be 0.007, this will yield a planet mass. Even if the HST images show that the blended light is not aligned with the source {and so is not from the lens}, the HST observations will still strongly constrain the mass by helping to measure the "microlens parallax", which when combined with the "angular Einstein radius", determines the mass. Thus, the observations have a very high probability of success. The observations are time-critical because the first one must be taken while the event is still in progress.
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