Neutrino Emission from Luminous Fast Blue Optical Transients

Abstract Mounting evidence suggests that luminous fast blue optical transients (LFBOTs) are powered by a compact object, launching an asymmetric and outflow responsible for the radiation observed in ultraviolet, optical, infrared, radio, X-ray bands. Proposed scenarios aiming to explain electromagnetic emission include inflated cocoon, surrounding jet choked extended stellar envelope. Alternatively, may arise from disk formed delayed merger of black hole with Wolf–Rayet star. We explore neutrino production these scenarios, i.e., internal shocks interaction between circumstellar medium (CSM). If on axis, provides dominant contribution fluence. Intriguingly, IceCube upper limit inferred closest LFBOT, AT2018cow, excludes region parameter space otherwise allowed observations. After correcting Eddington bias observation cosmic neutrinos, we conclude on-axis CSM is compatible detection two track-like events Neutrino Observatory coincidence considered be atmospheric origin. While LFBOTs does not constitute bulk diffuse background neutrinos IceCube, prospects nearby upcoming IceCube-Gen2 encouraging. Follow-up searches will crucial unraveling mechanism powering this emergent transient class.