Variability and transient search in the SUDARE-VOICE field: A new method to extract the light curves

Dezi Liu, Wenqiang Deng, Zuhui Fan, Liping Fu, Giovanni Covone, Mattia Vaccari, Mario Radovich, Massimo Capaccioli, Demetra De Cicco, Aniello Grado, Lucia Marchetti, Nicola Napolitano, Maurizio Paolillo, Giuliano Pignata, Fabio Ragosta

Resultado de la investigación: Contribución a una revistaArtículo de revisiónrevisión exhaustiva

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)3825-3837
Número de páginas13
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen493
N.º3
DOI
EstadoPublicada - 1 abr 2020

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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