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Millimagnitude photometry for transiting extrasolar planetary candidates*,**
V. Follow-up of 30 OGLE transits. New candidates
P. Pietrukowicz1,2, D. Minniti1,3, R. F. Díaz4, J. M. Fernández1,5, M. Zoccali1, W. Gieren6, G. Pietrzyński6,7, M. T. Ruíz8, A. Udalski7, T. Szeifert9 and M. Hempel1
1 Departamento de Astronomía y Astrofísica,
Pontificia Universidad Católica de Chile, Av. Vicuña MacKenna 4860,
Casilla 306, Santiago 22, Chile e-mail: pietruk@astro.puc.cl
2 Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland
3 Vatican Observatory, Vatican City State 00120, Italy
4 Instituto de Astronomía y Física del Espacio (CONICET-UBA), Buenos Aires, Argentina
5 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
6 Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
7 Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
8 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
9 European Southern Observatory, Casilla 19001, Vitacura, Santiago 19, Chile
Received: 24 March 2009
Accepted: 24 October 2009
Aims. We used VLT/VIMOS images in the V band to obtain light curves of the extrasolar planetary transits OGLE-TR-111 and OGLE-TR-113 and the candidate planetary transits: OGLE-TR-82, OGLE-TR-86, OGLE-TR-91, OGLE-TR-106, OGLE-TR-109, OGLE-TR-110, OGLE-TR-159, OGLE-TR-167, OGLE-TR-170, OGLE-TR-171.
Methods. Using difference imaging photometry, we were able to achieve millimagnitude errors in the individual data points. We present the analysis of the data and the light curves by measuring transit amplitudes and ephemerides and by calculating geometrical parameters for some of the systems.
Results. We observed nine OGLE objects at the predicted transit moments. Two other transits were shifted in time by a few hours. For another seven objects we expected to observe transits during the VIMOS run, but they were not detected.
Conclusions. The stars OGLE-TR-111 and OGLE-TR-113 are probably the only OGLE objects in the observed sample to host planets, with the other objects being very likely eclipsing binaries or multiple systems. In this paper we also report on four new transiting candidates which we have found in the data.
Key words: stars: individual: OGLE-TR-109, OGLE-TR-111, OGLE-TR-113 / planetary systems / binaries: eclipsing
Based on observations collected with the Very Large Telescope at Paranal Observatory (ESO Programme 075.C-0427(A), DM and JMF visiting observers).
Photometry of the transiting objects is available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/509/A4
© ESO, 2010
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