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The recent advanced LIGO/Virgo detections of gravitational waves (GWs) fromstellar binary black hole (BBH) mergers, in particular GW190521, which ispotentially associated with a quasar, have stimulated renewed interest inactive galactic nuclei (AGNs) as factories of merging BBHs. Compact objectsevolving from massive stars are unavoidably enshrouded by a massive envelope toform accretion-modified stars (AMSs) in the dense gaseous environment of asupermassive black hole (SMBH) accretion disk. We show that most AMSs formbinaries due to gravitational interaction with each other during radialmigration in the SMBH disk, forming BBHs inside the AMS. When a BBH is born,its orbit is initially governed by the tidal torque of the SMBH. Bondiaccretion onto BBH at a hyper-Eddington rate naturally develops and thencontrols the evolution of its orbits. We find that Bondi accretion leads toefficient removal of orbital angular momentum of the binary, whose final mergerproduces a GW burst. Meanwhile, the Blandford-Znajek mechanism pumps the spinenergy of the merged BH to produce an electromagnetic counterpart (EMC).Moreover, hyper-Eddington accretion onto the BBH develops powerful outflows andtriggers a Bondi explosion, which manifests itself as a EMC of the GW burst,depending on the viscosity of the accretion flow. Thermal emission from Bondisphere appears as one of EMCs. BBHs radiate GWs with frequencies $\sim10^{2}\,$Hz, which are accessible to LIGO.

the astrophysical journal. letters

Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei:  Gravitational Wave Bursts and Electromagnetic Counterparts from Merging  Stellar Black Hole Binaries