Parameter Variations in the Transits of Gliese 436b

Details Parameter Variations in the Transits of Gliese 436b Parameter Variations in the Transits of Gliese 436b

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340212c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #402.12; Bulletin of the American Astronomical Society, Vol. 41, p.193

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Scientific paper

We have collected new high-precision transit curves of Gl 436b with the 3.5-meter telescope at Apache Point Observatory, as well as other supporting telescopes. We model these along with all other published data, as well as a number of high-quality amateur observations, in a consistent and uniform manner. We find evidence for parameter variations in the transits of Gliese 436b, specifically rates of increasing inclination and width at 0.119±0.062 deg/yr and 3.39±1.01 min/yr respectively. These variations are consistent with a second planet in the M-dwarf system with a mass of less than 12 Earth masses. We do not detect any transit timing variations greater than 1 minute, which constrains the second planet to a non-resonant orbit. If our trends are confirmed over the next year or two, it will be the first planet detected via orbital perturbations to a known transiting planet.

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