How amateur observations can be used in the exoplanetary science?

BALUEV, R. V.; SOKOV, E. N.; SHAIDULIN, V. SH.; SOKOVA, I. A.; JONES, H. R. A.; ANGLADA-ESCUDÉ, G.; TUOMI, M.; BENNI, P.; COLAZO, C. A.; SCHNEITER, M. E.; VILLARREAL D'ANGELO, C. S.; BURDANOV, A. Y.; FERNÁNDEZ LAJÚS, E.; BASTURK, O.; HENTUNEN, V.-P.; SHADICK, S.

Honolulu, Hawaii

Encuentro; IAU XXIX General Assembly, Focus Meeting 8 ? Statistics and Exoplanets; 2015

IAU, University of Hawaii

We perform an analysis of ~80000 photometric measurements for the following 10 stars hosting transiting planets: WASP-2, -4, -5, -52, Kelt-1, CoRoT-2, XO-2, TrES-1, HD 189733, GJ 436. Our analysis includes mainly transit lightcurves from the Exoplanet Transit Database, public photometry from the literature, and some proprietary photometry privately supplied by other authors. Half of these lightcurves were obtained by amateurs. From this photometry we derive 306 transit timing measurements, as well as improved planetary transit parameters. For 5 of these 10 stars we also use radial velocity measurements obtained from the spectra stored in the HARPS, HARPS-N, and SOPHIE archives using the HARPS-TERRA pipeline.Our analysis of these TTV and RV data did not reveal significant hints of additional orbiting bodies in almost all of the cases. In the WASP-4 case, we found hints of marginally significant TTV signals having amplitude 10-20 sec, although their parameters are model-dependent and uncertain, while radial velocities did not reveal statistically significant Doppler signals.This work was supported by the Russian Foundation for Basic Research (project No. 14-02-92615 KO_a), the UK Royal Society International Exchange grant IE140055, by the President of Russia grant for young scientists (No. MK-733.2014.2), by the programmes of the Presidium of Russian Academy of Sciences P21 and P22, by the Saint Petersburg State University research grant 6.37.341.2015, and by the Russian Ministry of Education and Science (contract No. 01201465056). OB acknowledges the support by the research fund of Ankara University (BAP) through the project 13B4240006.