S20A0033abst
S20A0033
Accretion process of massive young stellar objects (MYSOs) is important to study their mass growth and stellar- and disk- evolution during formation. Recent first detection of accretion burst event in one MYSO, S255-NIRS3, gives a new view that episodic accretion can occur to MYSOs as well as lower-mass YSOs, but the detail physical information, especially soon after the accretion burst, is lacking. Our proposed ToO spectroscopic and imaging observations in the NIR or the MIR, triggered by methanol maser outburst, enable us to investigate uncovered mass growth process of MYSOs.
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