Published January 1, 2015
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Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems
Creators
- 1. Natl Cent Univ, Grad Inst Astron, Jhongli 32001, Taoyuan, Taiwan
- 2. Sabanci Univ, TR-34956 Istanbul, Turkey
- 3. Istanbul Univ, Fac Sci, Dept Astron & Space Sci, TR-34119 Istanbul, Turkey
- 4. Inst Planetenforsch, Deutsch Zent Luft & Raumfahrt EV, D-12489 Berlin, Germany
- 5. CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
- 6. Univ Shumen, Shumen 9700, Bulgaria
- 7. Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA
- 8. Slovak Acad Sci, Astron Inst, Tatranska Lomnica 05960, Slovakia
Description
As part of our ongoing effort to investigate transit timing variations (TTVs) of known exoplanets, we monitored transits of the four exoplanets HAT-P-18b, HAT-P-19b, HAT-P-27b/WASP-40b and WASP-21b. All of them are suspected to show TTVs due to the known properties of their host systems based on the respective discovery papers. During the past three years 46 transit observations were carried out, mostly using telescopes of the Young Exoplanet Transit Initiative. The analyses are used to refine the systems' orbital parameters. In all cases we found no hints for significant TTVs, or changes in the system parameters inclination, fractional stellar radius and planet-to-star radius ratio. However, comparing our results with those available in the literature shows that we can confirm the already published values.
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