TY - JOUR
T1 - Variability and transient search in the SUDARE-VOICE field
T2 - A new method to extract the light curves
AU - Liu, Dezi
AU - Deng, Wenqiang
AU - Fan, Zuhui
AU - Fu, Liping
AU - Covone, Giovanni
AU - Vaccari, Mattia
AU - Radovich, Mario
AU - Capaccioli, Massimo
AU - De Cicco, Demetra
AU - Grado, Aniello
AU - Marchetti, Lucia
AU - Napolitano, Nicola
AU - Paolillo, Maurizio
AU - Pignata, Giuliano
AU - Ragosta, Fabio
N1 - Funding Information:
South African Department of Science and Technology’s National Research Foundation (DST-NRF grant 113121) as part of the ISARP RADIOSKY2020 Joint Research Scheme. Support for GP is provided by the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded MAS.
Funding Information:
DZL thanks Zhenya Zheng and Chenggang Shu for their helpful discussions and comments. This work is supported by the Launching Research Fund for Postdoctoral Fellow from the Yunnan University with grant C176220200 and the China Postdoctoral Science Foundation with grant 2019M663582. ZHF acknowledges the support of National Nature Science Foundation of China (NSFC) under the grants 11933002, 11333001, and 11653001. LPF acknowledges the support from NSFC grants 11722326, 11673018 and 11933002, STCSM grants 18590780100, 19590780100, and 188014066, the Innovation Program 2019-01-07-00-02-E00032 and Shuguang Program 19SG41 supported by the Shanghai Education Development Foundation and Shanghai Municipal Education Commission (SMEC). GC acknowledges the SWIFAR visiting fellow program under which he had a fruitful visit to the South-Western Institute for Astronomy Research, Yunnan University. MV and LM acknowledge support from the Italian Ministry of Foreign Affairs and International Cooperation (MAECI grant ZA18GR02) and the
Funding Information:
DZL thanks Zhenya Zheng and Chenggang Shu for their helpful discussions and comments. Thiswork is supported by the Launching Research Fund for Postdoctoral Fellow from the Yunnan University with grant C176220200 and the China Postdoctoral Science Foundation with grant 2019M663582. ZHF acknowledges the support of National Nature Science Foundation of China (NSFC) under the grants 11933002, 11333001, and 11653001. LPF acknowledges the support from NSFC grants 11722326, 11673018 and 11933002, STCSM grants 18590780100, 19590780100, and 188014066, the Innovation Program 2019-01-07-00-02-E00032 and Shuguang Program 19SG41 supported by the Shanghai Education Development Foundation and Shanghai Municipal Education Commission (SMEC). GC acknowledges the SWIFAR visiting fellow program under which he had a fruitful visit to the South-Western Institute for Astronomy Research, Yunnan University. MV and LM acknowledge support from the Italian Ministry of Foreign Affairs and International Cooperation (MAECI grant ZA18GR02) and the South African Department of Science and Technology's National Research Foundation (DST-NRF grant 113121) as part of the ISARP RADIOSKY2020 Joint Research Scheme. Support for GP is provided by theMinistry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded MAS.
Publisher Copyright:
© 2020 The Author(s).
PY - 2020/4/1
Y1 - 2020/4/1
N2 - The VLT Survey Telescope (VST) Optical Imaging of the CDFS and ES1 Fields Survey, in synergy with the SUDARE survey, is a deep optical ugri imaging of the CDFS and ES1 fields using the VST. The observations for the CDFS field comprise about 4.38 deg2 down to r ~ 26 mag. The total on-sky time spans over 4 yr in this field, distributed over four adjacent subfields. In this paper, we use the multiepoch r-band imaging data to measure the variability of the detected objects and search for transients.We perform careful astrometric and photometric calibrations and point spread function modelling. A new method, referring to as differential running-average photometry, is proposed to measure the light curves of the detected objects. With the method, the difference of PSFs between different epochs can be reduced, and the background fluctuations are also suppressed. Detailed uncertainty analysis and detrending corrections on the light curves are performed. We visually inspect the light curves to select variable objects, and present some objects with interesting light curves. Further investigation of these objects in combination with multiband data will be presented in our forthcoming paper.
AB - The VLT Survey Telescope (VST) Optical Imaging of the CDFS and ES1 Fields Survey, in synergy with the SUDARE survey, is a deep optical ugri imaging of the CDFS and ES1 fields using the VST. The observations for the CDFS field comprise about 4.38 deg2 down to r ~ 26 mag. The total on-sky time spans over 4 yr in this field, distributed over four adjacent subfields. In this paper, we use the multiepoch r-band imaging data to measure the variability of the detected objects and search for transients.We perform careful astrometric and photometric calibrations and point spread function modelling. A new method, referring to as differential running-average photometry, is proposed to measure the light curves of the detected objects. With the method, the difference of PSFs between different epochs can be reduced, and the background fluctuations are also suppressed. Detailed uncertainty analysis and detrending corrections on the light curves are performed. We visually inspect the light curves to select variable objects, and present some objects with interesting light curves. Further investigation of these objects in combination with multiband data will be presented in our forthcoming paper.
KW - Catalogues
KW - Methods: data analysis
KW - Methods: observational
KW - Surveys
KW - Techniques: image processing
KW - Techniques: photometric
UR - http://www.scopus.com/inward/record.url?scp=85085386632&partnerID=8YFLogxK
U2 - 10.1093/mnras/staa558
DO - 10.1093/mnras/staa558
M3 - Review article
AN - SCOPUS:85085386632
SN - 0035-8711
VL - 493
SP - 3825
EP - 3837
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -