Mathematics – Probability
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115001b&link_type=abstract
American Astronomical Society, AAS Meeting #211, #150.01; Bulletin of the American Astronomical Society, Vol. 39, p.1001
Mathematics
Probability
Scientific paper
Given the recent discovery of transiting planets with eccentric orbits, and the prospects for many more such objects in the future with Kepler and CoRoT, I will discuss how eccentricity affects those planets' lightcurves and detectability. Eccentric planets have a transit probability that is a factor of (1-e^2)^-1 higher than planets with circular orbits but the same orbital semimajor axis. Many of the planets detected from space-based transit searches will orbit stars too dim to reliably measure those planets' orbital eccentricity. In these cases, transit lightcurve photometry alone can place a lower limit on a planet's eccentricity given a well-characterized stellar radius. Gravitational acceleration of the planet during the transit leads to a lightcurve asymmetry between ingress and egress that could be used to determine the orbital eccentricity. However, the effect is small enough that it will be challenging to detect given current methods.
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