Photometry of exoplanetary transits at Osservatorio Polifunzionale del Chianti
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Photometry of exoplanetary transits at Osservatorio Polifunzionale del Chianti L. Naponiello 1 & L. Betti 1 & A. Biagini 1 & M. Focardi 2 & E. Papini 1 & R. Stanga 3 & D. Trisciani 3 & M. Agostini 1,3 & V. Noce 1,3 & L. Fini 3 & E. Pace 1,3 Received: 26 September 2019 / Accepted: 16 July 2020/ # The Author(s) 2020
Abstract In this paper we report the observations of HD189733b, Kepler-41b, Kepler-42b, GJ 436b, WASP-77ab, HAT-P-32b and EPIC 211818569 as measured at the Osservatorio Polifunzionale del Chianti, a new astro-nomical site in Italy. Commissioning observing runs have been done in order to test capabilities, systematics and limits of the system and to improve its accuracy. For this purpose, a software algorithm has been developed to estimate the differential photometric error of any transit observation, so that the integration time can be chosen to reach optimal signal-to-noise ratios, and to obtain a picture of what kind of transits this setup can reveal. Currently, the system is able to reach an accuracy of about 1 mmag and so it is ready for the much needed exoplanetary transit follow-up. Keywords Extra-solar planets . Occultations . Photometry
1 Introduction The Osservatorio Polifunzionale del Chianti (OPC) is a new astronomical site managed by the University of Florence, whose name takes origin from the different observatories that are hosted in the building. Beside the Astronomical Observatory, Geo-seismic, Meteorological and Environmental Observatories fully operate in a fruitful synergic collaboration among themselves. The observatory hosts a 80 cm aperture telescope inside a 7-m diameter dome, amid several smaller aperture class instruments, and it is located on top of one of the highest hills of the Chianti area (43 31′24“N - 11 14’44”E, 450 m above sea level), among the darkest places in Italy. All the observations documented in this paper have been done using the main telescope, which has a focal ratio of F/8 and is supported by a German equatorial mount, while its optical design is based on a Ritchey-Chretien con guration (see Fig. 1). The focal plane can host * L. Naponiello [email protected] Extended author information available on the last page of the article
Experimental Astronomy
alternatively two CCD cameras from Moravian Instruments (G2–1600 and the new G4–9000, which has not been used for this paper) with lter wheels, both managed by means of MaxIm DL control SW from Cyanogen, and a focuser/rotator by MoonLite. Presently, the main research activity at OPC concerns the detection of transiting exoplanets, and here we report our observations of HD189733b (Bouchy et al. 2005), Kepler-41b [1], Kepler-42b [2], GJ 436b [3], WASP-77ab [4], HAT-P-32b [5] and EPIC 211818569 [6], which are well known exoplanets that have been chosen to test the OPC setup for their availability in the needed time frame and the di erent signal-tonoise (S/N) ratio of their transits. The OPC research staff is involved in national and international collaborations, like GAPS (Global Architecture
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