Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714

TL;DR

This study investigates near-infrared variability of the blazar S5 0716+714 over a week, finding significant short-term but no intra-day variability, and analyzing color changes across multiple NIR bands.

Contribution

First detailed NIR variability analysis of S5 0716+714 over a week, highlighting short-term changes and color variability in multiple passbands.

Findings

No intra-day variability detected in J, H, Ks bands.

Significant short-term variability observed in all bands.

Detected ~11.9% color variability in (J-H).

Abstract

In this paper, we report results of our near-infrared (NIR) photometric variability studies of the BL Lacertae object S5 0716+714. NIR photometric observations spread over 7 nights during our observing run April 2-9, 2007 at 1.8 meter telescope equipped with KASINICS (Korea Astronomy and Space Science Institute Near Infrared Camera System) and J, H, and Ks filters at Bohyunsan Optical Astronomy Observatory (BOAO), South Korea. We searched for intra-day variability, short term variability and color variability in the BL Lac object. We have not detected any genuine intra-day variability in any of J, H, and Ks passbands in our observing run. Significant short term variability ~ 32.6%, 20.5% and 18.2% have been detected in J, H, Ks passbands, respectively, and ~ 11.9% in (J-H) color.