TY - JOUR
T1 - The Carnegie Supernova Project II
T2 - Observations of the intermediate luminosity red transient SNhunt120
AU - Stritzinger, M. D.
AU - Taddia, F.
AU - Fraser, M.
AU - Tauris, Thomas
AU - Suntzeff, N. B.
AU - Contreras, C.
AU - Drybye, S
AU - Galbany, L.
AU - Holmbo, S.
AU - Morrell, N.
AU - Phillips, M. M.
AU - Prieto, J. L.
AU - Anais, J.
AU - Ashall, C.
AU - Baron, E.
AU - Burns, C. R.
AU - Hoeflich, P.
AU - Hsiao, E. Y.
AU - Karamehmetoglu, E.
AU - Moriya, T. J.
AU - Botticella, M. T.
AU - Campillay, A.
AU - Castellon, S.
AU - Gonzalez, C.
AU - Pumo, M. L.
AU - Torres-Robledo, S.
PY - 2020
Y1 - 2020
N2 - We present multi-wavelength observations of two gap transients followed by the Carnegie Supernova Project-II and supplemented with data obtained by a number of different programs. Here in the first of two papers, we focus on the intermediate luminosity red transient (ILRT) designated SNhunt120, while in a companion paper we examine the luminous red novae AT 2014ej. Our data set for SNhunt120 consists of an early optical discovery, estimated to be within 3 days after outburst, the subsequent optical and near-infrared broadband followup extending over a $\sim$2 month period, two visual- and two near-infrared wavelength spectra, and Spitzer Space Telescope observations extending from early ($+$28 d) to late ($+$1155 d) phases. SNhunt120 resembles other ILRTs such as NGC 300-2008-OT and SN 2008S, and like these other ILRTs, SNhunt120 exhibits prevalent mid-infrared emission at both early and late phases. From the comparison of SNhunt120 and other ILRTs to electron-capture supernova simulations, we find that the current models underestimate the explosion kinetic energy and thereby produce synthetic light curves that over-estimate the luminosity. Finally, examination of pre-outburst Hubble Space Telescope images yields no progenitor detection.
AB - We present multi-wavelength observations of two gap transients followed by the Carnegie Supernova Project-II and supplemented with data obtained by a number of different programs. Here in the first of two papers, we focus on the intermediate luminosity red transient (ILRT) designated SNhunt120, while in a companion paper we examine the luminous red novae AT 2014ej. Our data set for SNhunt120 consists of an early optical discovery, estimated to be within 3 days after outburst, the subsequent optical and near-infrared broadband followup extending over a $\sim$2 month period, two visual- and two near-infrared wavelength spectra, and Spitzer Space Telescope observations extending from early ($+$28 d) to late ($+$1155 d) phases. SNhunt120 resembles other ILRTs such as NGC 300-2008-OT and SN 2008S, and like these other ILRTs, SNhunt120 exhibits prevalent mid-infrared emission at both early and late phases. From the comparison of SNhunt120 and other ILRTs to electron-capture supernova simulations, we find that the current models underestimate the explosion kinetic energy and thereby produce synthetic light curves that over-estimate the luminosity. Finally, examination of pre-outburst Hubble Space Telescope images yields no progenitor detection.
UR - https://pure.au.dk/portal/en/publications/979af7dd-9dc7-45be-8e47-e5f668da05e5
U2 - 10.1051/0004-6361/202038018
DO - 10.1051/0004-6361/202038018
M3 - Journal article
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
ER -