A Rapidly Fading Star as a Type II Obscuring Intermediate Luminosity Optical Transient (ILOT) in a Triple-star System

Abstract We propose a triple-star scenario where the merger of two pre-main-sequence low-mass stars, ?0.5 M ? , ejects dusty equatorial outflow that obscures and temporarily causes disappearance massive star, ?8 . The inner binary powers faint outburst, i.e., intermediate luminosity optical transient (ILOT), but its main effect can last for decades is to (almost) disappear luminous star triple system. typical orbital period system about 1 yr. process proceeds as more-massive stars starts transfer mass least-massive in result expands. This type II obscuring ILOT might account fading, rebrightening, then refading post-main-sequence M101-OC1. It recover 20–100 Our study strengthens claim there are alternative scenarios disappearing removing need failed supernovae. In these temporary, lasting from months decades, therefore at later time explodes core collapse supernova, even if it forms black hole.