MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE0047-1756: microlensing and a new time delay

Giannini, E.; Schmidt, R.W.; Wambsganss, J.; Alsubai, K.; Andersen, J.M.; Anguita, T.; Bozza, V.; Bramich, D.M.; Browne, P.; Calchi Novati, S.; Damerdji, Y.; Diehl, C.; Dodds, P.; Dominik, M.; Elyiv, A.; Fang, X.; Figuera Jaimes, R.; Finet, F.; Gerner, T.; Gu, S.; Hardis, S.; Harpsøe, K.; Hinse, T.C.; Hornstrup, A.; Hundertmark, M.; Jessen-Hansen, J.; Jørgensen, U.G.; Juncher, D.; Kains, N.; Kerins, E.; Korhonen, H.; Liebig, C.; Lund, M.N.; Lundkvist, M.S.; Maier, G.; Mancini, L.; Masi, G.; Mathiasen, M.; Penny, M.; Proft, S.; Rabus, M.; Rahvar, S.; RiccI, D.; Scarpetta, G.; Sahu, K.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Surdej, J.; Tregloan-Reed, J.; Vilela34, C.; Wertz, O.; Zimmer, F.

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 ?t = (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.

Citation

Giannini, E., Schmidt, R., Wambsganss, J., Alsubai, K., Andersen, J., Anguita, T., …Zimmer, F. (2017). MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE0047-1756: microlensing and a new time delay. Astronomy & Astrophysics, 597, Article A49. https://doi.org/10.1051/0004-6361/201527422

• Journal Article Type: Article
• Acceptance Date: Sep 21, 2016
• Online Publication Date: Dec 21, 2016
• Publication Date: Jan 1, 2017
• Publicly Available Date: May 26, 2023
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 597
• Article Number: A49
• DOI: https://doi.org/10.1051/0004-6361/201527422
• Keywords: gravitational lensing, micro, techniques, photometric, quasars, genera
• Publisher URL: https://doi.org/10.1051/0004-6361/201527422