Giseon Baek

Color variability of HBC 722 in the post-outburst phases

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.

The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4

We present our first results of the survey for high redshift quasars at

VARIABILITY AT THE EDGE: OPTICAL NEAR/IR RAPID-CADENCE MONITORING OF NEWLY OUTBURSTING FU ORIONIS OBJECT HBC 722

5 \lesssim {\rm z} \lesssim 5.7

The ice composition in the protoplanetary disk V883 Ori revealed by its stellar outburst

. The search for quasars in this redshift range has been known to be challenging due to limitations of filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60

SED MODELING FOR CLASS 0 PROTOSTAR L1527 IRS

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Photometric monitoring of V1057 Cyg

z

Photometric observations of V1057 Cyg

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Color evolution of HBC 722 in the post-outburst phase

5.40 and 5.50

Infrared Medium-Deep Survey : Overview

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Variability Analysis of HBC722 using Lomb-Scargle Periodogram

z