Statistics – Applications
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441120g&link_type=abstract
American Astronomical Society, AAS Meeting #214, #411.20; Bulletin of the American Astronomical Society, Vol. 41, p.678
Statistics
Applications
Scientific paper
When a planet with radius Rp transits in front of its parent star with radius R*, the flux of the star decreases by a fractional amount r2= (Rp/R*)2, while the stellar photocenter shifts by r2 theta*, where theta* is the angular radius of the star. For the nearest transiting planets, this shift is of order microarcseconds, and so is within the reach of SIM. Measurement of the astrometric shift during transit yields the angular radius of the star, which when combined with the stellar density determined from the photometric light curve, and the stellar parallax, yields the radius and mass of the star. This astrometric shift also allows one to determine the (three-dimensional) direction of the planet orbit normal, which is useful for a number of applications. I will discuss the feasibility of measuring the astrometric signature of transiting planets with SIM, paying particular attention to the practical aspects of making these measurements for the known transiting planet systems.
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