The super-Earth GJ1214b transits a nearby M dwarf that exhibits 1 \% intrinsic variability in the near-infrared .
Here , we analyze new observations to refine the physical properties of both the star and planet .
We present three years of out-of-transit photometric monitoring of the stellar host GJ1214 from the MEarth Observatory and find the rotation period to be long , mostly likely an integer multiple of 53 days , suggesting low levels of magnetic activity and an old age for the system .
We show such variability will not pose significant problems to ongoing studies of the planet ’ s atmosphere with transmission spectroscopy .
We analyze 2 high-precision transit light curves from ESO ’ s Very Large Telescope along with 7 others from the MEarth and FLWO 1.2 meter telescopes , finding physical parameters for the planet that are consistent with previous work .
The VLT light curves show tentative evidence for spot occultations during transit .
Using two years of MEarth light curves , we place limits on additional transiting planets around GJ1214 with periods out to the habitable zone of the system .
We also improve upon the previous photographic V -band estimate for the star , finding V = 14.71 \pm 0.03 .