Spitzer Secondary Eclipse Timing Observations of Exoplanets in Eccentric Orbits

Details Spitzer Secondary Eclipse Timing Observations of Exoplanets in Eccentric Orbits Spitzer Secondary Eclipse Timing Observations of Exoplanets in Eccentric Orbits

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.6208a&link_type=abstract

American Astronomical Society, DPS meeting #42, #62.08; Bulletin of the American Astronomical Society, Vol. 42, p.1091

Astronomy and Astrophysics

Astronomy

Scientific paper

The Spitzer Exoplanet Target-of-Opportunity program has observed the secondary eclipses of several planets in suspected eccentric orbits around their host stars. The midpoint time determined from each observation can be combined with radial velocity (RV) and transit data to provide improved sets of orbital parameters for a given exoplanet. The orbital phase of the midpoint can be used to establish lower limits on the eccentricity (particularly on ecosω, where e is eccentricity and ω is the argument of periastron) that are independent of RV data. Multiple midpoints can be used to detect parameter variation. We present results for WASP-12b (e < 0.06), WASP-14b (e 0.087), WASP-18b (e 0.0088), GJ 436b (e 0.1368), and HAT-P-13b; discussion of techniques of joint orbital modeling, including methods of detecting apsidal motion; dynamical implications for selected systems; and the role of amateur observers as sources of exoplanet data. Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA, which provided support for this work.

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