Discovery of Two Supernovae in the Nuclear Regions of the Luminous Infrared Galaxy IC 883
Colina, L.; Kankare, E.; Efstathiou, A.; Alberdi, A.; Melinder, J.; Väisänen, P.; Alonso-Herrero, A.; Romero-Cañizales, C.; Mattila, S.; Ryder, S.; Kotilainen, J.; Pérez-Torres, M. -A.; Takalo, A.
Finland, Australia, South Africa, Spain, Cyprus, Sweden
Abstract
We report the discovery of two consecutive supernovae (SNe), 2010cu and 2011hi, located at 0farcs37 (180 pc) and 0farcs79 (380 pc) projected distance, respectively, from the center of the K-band nucleus of the luminous infrared galaxy (LIRG) IC 883. The SNe were discovered in an ongoing near-infrared K-band search for core-collapse SNe in such galaxies using the ALTAIR/NIRI adaptive optics system with laser guide star at the Gemini-North Telescope. These are thus the closest SNe yet discovered to an LIRG nucleus in optical or near-infrared wavelengths. The near-infrared light curves and colors of both SNe are consistent with core-collapse events. Both SNe seem to suffer from relatively low host galaxy extinction suggesting that regardless of their low projected galactocentric distances, they are not deeply buried in the nuclear regions of the host galaxy.