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

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  • M. D. Stritzinger
  • F. Taddia
  • M. Fraser, University College Dublin
  • ,
  • T. M. Tauris
  • N. B. Suntzeff, Texas A&M University
  • ,
  • C. Contreras, Carnegie Observatories
  • ,
  • S Drybye, Aarhus University, Nordic Optical Telescope
  • ,
  • L. Galbany, Universidad de Granada
  • ,
  • S. Holmbo
  • N. Morrell, Carnegie Observatories
  • ,
  • M. M. Phillips, Carnegie Observatories
  • ,
  • J. L. Prieto, Universidad Diego Portales, Millenium Institute of Astrophysics
  • ,
  • J. Anais, Carnegie Observatories
  • ,
  • C. Ashall, Florida State University
  • ,
  • E. Baron, University of Oklahoma
  • ,
  • C. R. Burns, Observatories of the Carnegie Institution for Science
  • ,
  • P. Hoeflich, Florida State University
  • ,
  • E. Y. Hsiao, Florida State University
  • ,
  • E. Karamehmetoglu
  • T. J. Moriya, National Astronomical Observatory of Japan, Monash University
  • ,
  • M. T. Botticella, INAF - Osservatorio Astronomico di Capodimonte
  • ,
  • A. Campillay, Carnegie Observatories
  • ,
  • S. Castellon, Carnegie Observatories
  • ,
  • C. Gonzalez, Carnegie Observatories
  • ,
  • M. L. Pumo, Università degli studi di Catania, INAF - Osservatorio Astronomico di Padova, Laboratori Nazionali del Sud-INFN
  • ,
  • S. Torres-Robledo, Carnegie Observatories, SOAR Telescope
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.
Original languageEnglish
Article numberA103
JournalAstronomy & Astrophysics
Volume639
Number of pages17
ISSN0004-6361
DOIs
Publication statusPublished - 2020

Bibliographical note

Paper 1 of a series of 2. Eight pages of text, 14 figures, and 10 tables. Resubmitted to A&A after addressing constructive comments from the referee

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