Color Variability of HBC 722 in the Post-Outburst Phases

Abstract

We carried out photometric observations for HBC 722 in SDSS r, i and z bands from 2011 April to 2013 May with a Camera for Quasars in Early uNiverse attached to the 2.1m Otto Struve telescope at McDonald Observatory. The post-outburst phenomena were classified into five phases according to not only brightness but also color variations, which might be caused by physical changes in the emitting regions of optical and near-infrared bands. A series of spectral energy distribution (SED) is presented to support color variations and track the time evolution of SED in optical/near-infrared bands after the outburst. Given two years of data, possible periodicities of r, i and z bands were checked. We found out three families of signals around ~6, ~10 and ~1 days in three bands, which is broadly consistent with Green et al. (2013). We also examined short term variability (intra-day and day scales) to search for evidences of flickering by using the micro-variability method. We found clear signs of day scale variability and weak indications of intra-day scale fluctuations, which implies that the flickering event occurs in HBC 722 after outburst.

42 pages, 11 Figures, 6 Tables

References in corpus (3)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714

Cited by in corpus (7)

• Multi-wavelength study of the low-luminosity outbursting young star HBC 722
• Diagnosing FUor-like Sources: The Parameter Space of Viscously Heated Disks in the Optical and Near-IR
• High Resolution Optical and NIR Spectra of HBC 722
• Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct
• A multi-epoch, multi-wavelength study of the classical FUor V1515 Cyg approaching quiescence
• The FUor star V2493 Cyg (HBC 722) -- eleven years at maximum brightness
• Gaia20bdk -- a new FUor in Sh 2-301 Star Forming Region