Near-infrared Monitoring of the Accretion Outburst in the MYSO S255-NIRS3

Abstract

We followed-up the massive young stellar object (MYSO) S255-NIRS3 (=S255-IRS1b) during its recent accretion outburst event in the Ks band with Kanata/HONIR for four years after its burst and obtained a long-term light curve. This is the most complete NIR light-curve of the S255-NIRS3 burst event that has ever been presented. The light curve showed a steep increase reaching a peak flux that was 3.4 mag brighter than the quiescent phase and then a relatively moderate year-scale fading until the last observation, similar to that of the accretion burst events such as EXors found in lower-mass young stellar objects. The behavior of the Ks band light curve is similar to that observed in 6.7 GHz class II methanol maser emission, with a sudden increase followed by moderate year-scale fading. However, the maser emission peaks appear 30-50 days earlier than that of the Ks band emission. The similarities confirmed that the origins of the maser emission and the Ks band continuum emission is common as previously shown from another infrared and radio observations by Stecklum et al. (2016); Caratti o Garatti et al. (2017a); Moscadelli et al. (2017). However, the differences in energy transfer paths, such as the exciting/emitting/scattering structures, may cause the delay in the flux-peak dates.

8 pages, 4 figures, 2 tables, accepted to PASJ

References in corpus (4)

• An extraordinary outburst in the massive protostellar system NGC6334I-MM1: quadrupling of the millimeter continuum
• On the existence of accretion-driven bursts in massive star formation
• Highly variable young massive stars in ATLASGAL clumps
• The Variable Reflection Nebula Cepheus A East

Cited by in corpus (14)

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• Water maser variability in a high-mass YSO outburst -- VERA and ALMA observations of S255 NIRS 3
• The sharpest view on the high-mass star-forming region S255IR. Near-InfraRed Adaptive Optics Imaging on the Outbursting Source NIRS3
• The accretion burst of the massive young stellar object G323.46 -0.08
• Ammonia mapping observations toward the Galactic massive star-forming region Sh 2-255 and Sh 2-257
• Astronomical masers and Dicke's superradiance
• The Role of Thermal Instability in Accretion Outbursts in High-Mass Stars
• Maser Flares Driven by Variations in Pumping and Background Radiation
• Fine structure and kinematics of the ionized and molecular gas in the jet and disk around S255IR NIRS3 from high resolution ALMA observations
• Spectral survey of a Hot core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The discovery of class I and class II millimeter methanol maser transitions
• Mid-Infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.09
• Analysis of Methanol Maser Flares in G107.298+5.63 andS255-NIRS3