No transit timing varations for HAT-P-6 b or WASP-1 b

Limits on Transit Timing Variations in HAT-P-6 and WASP-1
http://arxiv.org/abs/1001.3059

Abstract wrote:

We detected the transit of HAT-P-6b at HJD 2454698.3908 +/- 0.0011 and that of WASP-1b at HJD 2454774.3448 +/- 0.0023. The updated orbital periods of the planets are 3.852992 +/- 0.000005 days (HAT-P-6b) and 2.519970 +/- 0.000003 days (WASP-1b). There is no indication of any departures from constant orbital period in these systems.