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Currently the only technique sensitive to Earth mass planets around nearbystars (that are too close for microlensing) is the monitoring of the transittime variations of the transiting extrasolar planets. We search for additionalplanets in the systems of the hot Neptune GJ 436b, and the hot-Jupiter XO-1b,using high cadence observations in the J and Ks bands. New high-precisiontransit timing measurements are reported: GJ 436b Tc = 2454238.47898 \pm0.00046 HJD; XO-1b Tc(A) = 2454218.83331 \pm 0.00114 HJD, Tc(B) = 2454222.77539\pm 0.00036 HJD, Tc(C) = 2454222.77597 \pm 0.00039 HJD, Tc(D) = 2454226.71769\pm 0.00034 HJD, and they were used to derive new ephemeris. We also determineddepths for these transits. No statistically significant timing deviations weredetected. We demonstrate that the high cadence ground based near-infraredobservations are successful in constraining the mean transit time to ~30 sec.,and are a viable alternative to space missions.

High Cadence Near Infrared Timing Observations of Extrasolar Planets: I. GJ 436b and XO-1b