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There have been numerous reports of anomalies during transits of the planetTrES-1b. Recently, Rabus and coworkers' analysis of HST observations lead themto claim brightening anomalies during transit might be caused by either asecond transiting planet or a cool starspot. Observations of two consecutivetransits are presented here from the University of Arizona's 61-inch KuiperTelescope on May 12 and May 15, 2008 UT. A 5.4 +/- 1.7 mmag (0.54 +/- 0.17%)brightening anomaly was detected during the first half of the transit on May 12and again in the second half of the transit on May 15th. We conclude that thisis a tentative detection of a r greater than or equal to 6 earth radii starspotrotating on the surface of the star. We suggest that all evidence to datesuggest TrES-1 has a spotty surface and there is no need to introduce a secondtransiting planet in this system to explain these anomalies. We are only ableto constrain the rotational period of the star to 40.2 +22.9 -14.6 days, due toprevious errors in measuring the alignment of the stellar spin axis with theplanetary orbital axis. This is consistent with the previously observed P_obs =33.2 +22.3 -14.3 day period. We note that this technique could be applied toother transiting systems for which starspots exist on the star in the transitpath of the planet in order to constrain the rotation rate of the star.(abridged)

astrophysical journal/the astrophysical journal

A Tentative Detection of a Starspot During Consecutive Transits of an  Extrasolar Planet from the Ground: No Evidence of a Double Transiting Planet  System Around TrES-1