As part of the Transit Ephemeris Refinement and Monitoring Survey ( TERMS ) , we present new radial velocities and photometry of the HD 192263 system .
Our analysis of the already available Keck-HIRES and CORALIE radial velocity measurements together with the five new Keck measurements we report in this paper results in improved orbital parameters for the system .
We derive constraints on the size and phase location of the transit window for HD 192263b , a Jupiter-mass planet with a period of 24.3587 \pm 0.0022 days .
We use 10 years of Automated Photoelectric Telescope ( APT ) photometry to analyze the stellar variability and search for planetary transits .
We find continuing evidence of spot activity with periods near 23.4 days .
The shape of the corresponding photometric variations changes over time , giving rise to not one but several Fourier peaks near this value .
However , none of these frequencies coincides with the planet ’ s orbital period and thus we find no evidence of star-planet interactions in the system .
We attribute the \sim 23-day variability to stellar rotation .
There are also indications of spot variations on longer ( 8 years ) timescales .
Finally , we use the photometric data to exclude transits for a planet with the predicted radius of 1.09 R _ { J } , and as small as 0.79 R _ { J } .