A Submillimeter Burst of S255IR SMA1: The Rise and Fall of Its Luminosity
Sheng-Yuan Liu1*, Yu-Nung Su1, Igor Zinchenko2, Kuo-Song Wang1, Yuan Wang3
1Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
2Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russian Federation
3Max Planck Institute for Astronomy, Max Planck Institute, Heidelberg, Germany
* Presenter:Sheng-Yuan Liu, email:syliu@asiaa.sinica.edu.tw
Temporal photometric variations at near-infrared to submillimeter wavelengths have been found in low-mass young stellar objects. These phenomena are generally interpreted as accretion events of star-disk systems with varying accretion rates. There is growing evidence suggesting that similar luminosity flaring also occurs in high-mass star/cluster-forming regions. We report the rise and fall of the 900 μm continuum emission and the newly found 349.1 GHz methanol maser emission in the massive star-forming region S255IR SMA1 observed with the Submillimeter Array and the Atacama Large Millimeter/submillimeter Array. The level of flux variation at a factor of around 2 at the submillimeter band and the relatively short 2 years duration of this burst suggest that the event is probably similar to those milder and more frequent minor bursts seen in 3D numerical simulations.

Keywords: star formation, submillimeter