MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay

Creators: Giannini, Enrico; Calchi Novati, S.

Abstract

Aims. We present V and R photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756. The data were taken by the MiNDSTEp collaboration with the 1.54 m Danish telescope at the ESO La Silla observatory from 2008 to 2012. Methods. Differential photometry has been carried out using the image subtraction method as implemented in the HOTPAnTS package, additionally using GALFIT for quasar photometry. Results. The quasar WFI 2033-4723 showed brightness variations of order 0.5 mag in V and R during the campaign. The two lensed components of quasar HE 0047-1756 varied by 0.2–0.3 mag within five years. We provide, for the first time, an estimate of the time delay of component B with respect to A of Δt = (7.6 ± 1.8) days for this object. We also find evidence for a secular evolution of the magnitude difference between components A and B in both filters, which we explain as due to a long-duration microlensing event. Finally we find that both quasars WFI 2033-4723 and HE 0047-1756 become bluer when brighter, which is consistent with previous studies.

Additional Information

© 2016 ESO. Received: 22 September 2015; Accepted: 21 September 2016; Published online 21 December 2016. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla observatory. We would like to thank the anonymous referee for having significantly contributed to improving the quality of this manuscript. We would like to thank Armin Rest for introducing us to the HoTPANnTS software. We also thank Ekaterina Koptelova for having provided the light curves of quasar UM673. E.G. gratefully acknowledges the support of the International Max Planck Research School for Astrophysics (IMPRS-HD) and the HGSFP. E.G. also thanks Katie Ramiré for helpful suggestions. T.A. acknowledges support from FONDECYT proyecto 11130630 and the Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. M.D. and M.H. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). M.H. acknowledges support from the Villum foundation. This publication was made possible by NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 268421. T.C.H. would like to acknowledge financial support from KASI travel grant 2012-1-410-02 and Korea Research Council for Fundamental Science and Technology (KRCF). D.R. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under the 2011 Severo Ochoa Program MINECO SEV-2011-0187. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (grant agreement No.: DNRF106). The research is supported by the ASTERISK project (ASTERoseismic Investigations with SONG and Kepler) funded by the European Research Council (grant agreement No.: 267864). Y.D., A.E., F.F., D.R., O.W., and J. Surdej acknowledge support from the Communauté française de Belgique – Actions de recherche concertées – Académie Wallonie-Europe.

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