I am an Astronomer at the Space Telescope Science Institute. I am also an Instrument Scientist for the WFC3 instrument on board the Hubble Space Telescope.
My current research is mainly focussed on the study of extra-solar planets, and a few projects involving microlensing. I am leading several microlensing projects, aimed at determining masses of nearby stars through their relativistic deflections, detecting neutron stars and black holes and measuring their masses through astrometric microlensing, etc.
We recently measured the mass of the nearby white dwarf Stein 2051 B, by measuring the relativistic deflection of a background star. The results are published in a Research Article in the June 9, 2017 issue of Science. Click here for the Abstract, and click here for the full Article. There was a STScI Press Release, and an American Astronomical Society Press Conference talk on this topic (under "Bending and Blending").
One of my favorite research programs was to search for exoplanets in the Galactic bulge, through a large HST program called SWEEPS (Sagittarius Window Eclipsing Extrasolar Planet Search). This program involved monitoring of about 300,000 stars towards the Galactic bulge using the Advanced Camera System (ACS) on board HST, to search for transiting exoplanets. This led to the discovery of 16 planet candidates, including 5 ultra-short-period planets. These results were published as a full Article in Nature (also available through astro-ph). The NASA Science Update, held on 4 October 2006, gives some details on these results.
For more details on my research and functional activities, click on the
|Research Interests||HST-Support Activities|
|Curriculum Vita (pdf format)||Online Recent Seminars|
|Publications (pdf format)||Related Sites|
|Revised LHS Catalogue|