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.

arXiv comment42 pages, 11 Figures, 6 Tables

References in corpus (20)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• 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
• The u'g'r'i'z' Standard Star Network
• Using FU Orionis Outbursts to Constrain Self-Regulated Protostellar Disk Models
• High-Resolution Spectroscopy of FUors
• Continuum Variability of Deeply Embedded Protostars as a Probe of Envelope Structure
• Evidence for an FU Orionis-like Outburst from a Classical T Tauri Star
• The outburst and nature of two young eruptive stars in the North America/Pelican Nebula Complex
• The photometric evolution of FU Orionis objects: disc instability and wind-envelope interaction
• Flickering in FU Orionis
• Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714
• The large amplitude outburst of the young star HBC 722 in NGC 7000/IC 5070, a new FU Orionis candidate
• The Periodic Spectroscopic Variability of FU Orionis
• Optical photometric and spectral study of the new FU Orionis object V2493 Cyg (HBC 722)
• Camera for QUasars in EArly uNiverse (CQUEAN)
• Variability at the Edge: Optical Near/IR Rapid Cadence Monitoring of Newly Outbursting FU Orionis Object HBC 722
• Photometric variability in FU Ori and Z CMa as observed by MOST
• Auto-Guiding System for CQUEAN (Camera for QUasars in EArly uNiverse)
• High Cadence Time-Series Photometry of V1647 Orionis

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