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Here we confirm the short periodic variability of a subparsec supermassivebinary black hole (SMBBH) candidate Mrk 231 in the extended optical photometricdata set collected by the Catalina Real-Time Transient Survey (CRTS) andAll-Sky Automated Survey for Supernovae (ASAS-SN). Using the Lomb-Scargleperiodogram and 2DHybrid method, we detected the significant periodicity of ~1.1 yr beyond a damped random walk model in the CRTS+ASAS-SN optical data set.Mrk 231 has been previously proposed as a SMBBH candidate with a highly unequalmass ratio (q~ 0.03), very tight mutual separation of ~590 AU, and an orbitalperiod of ~1.2 yr. Hence, our result further supports, even though not prove,the intriguing hypothesis that SMBBHs with low mass ratios may be more commonthan close-equal mass SMBBHs. This result, however, was obtained from thecontribution of CRTS data with limited sampling cadence and photometricaccuracy, and further monitoring of Mrk 231 is crucial to confirm theperiodicity.

Confirmed short periodic variability of subparsec supermassive binary black hole candidate Mrk 231