The Carnegie Supernova Project II. Observations of the intermediate luminosity red transient SNhunt120

摘要: We present multi-wavelength observations of two gap transients followed by the Carnegie Supernova Project-II and supplemented with data obtained a number different programs. Here in first papers, we focus on intermediate luminosity red transient (ILRT) designated SNhunt120, while companion paper examine luminous novae AT 2014ej. Our set for SNhunt120 consists an early optical discovery, estimated to be within 3 days after outburst, subsequent near-infrared broadband followup extending over $\sim$2 month period, visual- wavelength spectra, Spitzer Space Telescope from ($+$28 d) late ($+$1155 phases. resembles other ILRTs such as NGC 300-2008-OT SN 2008S, like these ILRTs, exhibits prevalent mid-infrared emission at both From comparison electron-capture supernova simulations, find that current models underestimate explosion kinetic energy thereby produce synthetic light curves over-estimate luminosity. Finally, examination pre-outburst Hubble images yields no progenitor detection.