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Gliese 436 is an M dwarf with a mass of 0.45 Msun and hosts the extrasolarplanet GL 436b [3, 6, 7, 2], which is currently the least massive transitingplanet with a mass of ~23.17 Mearth [10], and the only planet known to transitan M dwarf. GL 436b represents the first transiting detection of the class ofextrasolar planets known as "Hot Neptunes" that have masses within a few timesthat of Neptune's mass (~17 Mearth) and orbital semimajor axis <0.1 AU aboutthe host star. Unlike most other known transiting extrasolar planets, GL 436bhas a high eccentricity (e~0.16). This brings to light a new parameter spacefor habitability zones of extrasolar planets with host star masses much smallerthan typical stars of roughly a solar mass. This unique system is an idealcandidate for orbital perturbation and transit-time variation (TTV) studies todetect smaller, possibly Earth-mass planets in the system. In April 2008 webegan a long-term intensive campaign to obtain complete high-precision lightcurves using the Apache Point Observatory's 3.5-meter telescope, NMSU's 1-metertelescope (located at APO), and Sommers Bausch Observatory's 24" telescope.These light curves are being analyzed together, along with amateur and otherprofessional astronomer observations. Results of our analysis are discussed.Continued measurements over the next few years are needed to determine ifadditional planets reside in the system, and to study the impact of othermanifestations on the light curves, such as star spots and active regions.

Transit Timing Observations of the Extrasolar Hot-Neptune Planet GL 436b