New photometric pipeline to explore temporal and spatial variability with KMTNET deep-south observations

Seo Won Chang, Yong Ik Byun, Min Su Shin, Hahn Yi, Myung Jin Kim, Hong Kyu Moon, Young Jun Choi, Sang Mok Cha, Yongseok Lee

Research output: Contribution to journalArticlepeer-review


The DEEP-South (the Deep Ecliptic Patrol of the Southern Sky) photometric census of small Solar System bodies produces massive time-series data of variable, transient or moving objects as a byproduct. To fully investigate unexplored variable phenomena, we present an application of multi-aperture photometry and FastBit indexing techniques for faster access to a portion of the DEEP-South year-one data. Our new pipeline is designed to perform automated point source detection, robust high-precision photometry and calibration of non-crowded fields which have overlap with previously surveyed areas. In this paper, we show some examples of catalog-based variability searches to find new variable stars and to recover targeted asteroids. We discover 21 new periodic variables with period ranging between 0.1 and 31 days, including four eclipsing binary systems (detached, over-contact, and ellipsoidal variables), one white dwarf/M dwarf pair candidate, and rotating variable stars. We also recover astrometry (< ±1–2 arcsec level accuracy) and photometry of two targeted near-earth asteroids, 2006 DZ169 and 1996 SK, along with the small-(∼0.12 mag) and relatively large-amplitude (∼0.5 mag) variations of their dominant rotational signals in R-band.

Original languageEnglish
Pages (from-to)129-142
Number of pages14
JournalJournal of the Korean Astronomical Society
Issue number5
Publication statusPublished - 2018

Bibliographical note

Publisher Copyright:
© 2018, The Korean Astronomical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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