Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079

Abstract

Context: Periodicity in 6.7 GHz methanol maser sources is a rare phenomenon that was discovered during long-term monitoring programmes. Understanding the underlying processes that lead to periodic variability might provide insights into the physical processes in high-mass star-forming regions. Aims: We aim to identify and describe new periodic methanol masers. Methods: The observations were obtained with the Torun 32m antenna. Time series analysis was conducted using well-proven statistical methods. Additionally, NEOWISE data were used to search for a correlation between infrared and maser fluxes. Results: We found two new periodic sources, G45.804-0.356 and G49.043-1.079, with periods of 416.9 and 469.3 days, respectively. For G49.043-1.079, infrared variability is simultaneous with methanol flares. Conclusions: A most likely cause of the periodicity in G49.043-1.079 is modulated accretion. For G45.804-0.356, the periodicity cannot be explained with the available data, and further research is needed.

8 pages, 5 figures

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Cited by in corpus (4)

• The accretion burst of the massive young stellar object G323.46 -0.08
• Detection of the longest periodic variability in 6.7 GHz methanol masers G5.900-0.430
• Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars
• MeerKAT and ALMA view of the AGAL045.804-0.356 clump