We report on observations of transit events of the transiting planets XO-1b and TrES-1 with a 25 cm telescope of the University Observatory Jena. With the transit timings for XO-1b from all 50 available XO, SuperWASP, Transit Light Curve (TLC)-Project- and Exoplanet Transit Database (ETD)-data, including our own I-band photometry obtained in March 2007, we find that the orbital period is P= (3.941501 +/- 0.000001) d, a slight change by ~3 s compared to the previously published period. We present new ephemeris for this transiting planet. Furthermore, we present new R-band photometry of two transits of TrES-1. With the help of all available transit times from literature this allows us to refine the estimate of the orbital period: P=(3.0300722 +/- 0.0000002) d. Our observations will be useful for future investigations of timing variations caused by additional perturbing planets and/or stellar spots and/or moons.
@article{arxiv.0905.1833,
title = {Planetary transit observations at the University Observatory Jena: XO-1b and TrES-1},
author = {St. Raetz and M. Mugrauer and T. O. B. Schmidt and T. Roell and T. Eisenbeiss and M. M. Hohle and N. Tetzlaff and M. Vanko and A. Seifahrt and Ch. Broeg and J. Koppenhoefer and R. Neuhäuser},
journal= {arXiv preprint arXiv:0905.1833},
year = {2015}
}
Comments
7 pages, 7 figures, 5 tables, accepted for publication in AN