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In a binary system, the gravitational potential of the primary black hole mayplay an important role in enhancing the fallback accretion onto the lightercompact object newly formed in the second supernova explosion. As a result, thefinal masses of the binary compact objects would be correlated, as suggestedrecently by Safarzadeh \& Wysocki. In this work, we analyze the massdistribution of four gravitational-wave events, which are characterized by botha small mass ratio and a low mass ($\leq 5M_\odot$) of the light component, andfind tentative evidence for a mass correlation among the objects. To evaluatethe feasibility of testing such a hypothesis with upcoming observations, wecarry out simulations with a mock population and perform Bayesian hierarchicalinference for the mass distribution. We find that with dozens of low mass ratioevents, whether there exists correlation in the component mass distributions ornot can be robustly tested and the correlation, if it exists, can be welldetermined.

astrophysical journal/the astrophysical journal

Black Hole Gravitational Potential Enhanced Fallback Accretion onto the  Nascent Lighter Compact Object: Tentative Evidence in the O3 Run Data of  LIGO/Virgo