The Carnegie Supernova Project II: Observations of the luminous red nova AT 2014ej

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  • M. D. Stritzinger
  • F. Taddia
  • M. Fraser, University College Dublin
  • ,
  • T. M. Tauris
  • C. Contreras, Carnegie Observatories
  • ,
  • S Drybye, Aarhus Universitet, Nordic Optical Telescope
  • ,
  • L. Galbany, Universidad de Granada
  • ,
  • S. Holmbo
  • N. Morrell, Carnegie Observatories
  • ,
  • A. Pastorello, INAF - Osservatorio Astronomico di Padova
  • ,
  • M. M. Phillips, Carnegie Observatories
  • ,
  • G. Pignata, Universidad Andres Bello, Millennium Institute of Astrophysics
  • ,
  • L. Tartaglia, Stockholm University
  • ,
  • N. B. Suntzeff, Texas A&M University
  • ,
  • 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
  • ,
  • G. Bock
  • ,
  • A. Campillay, Carnegie Observatories
  • ,
  • S. Castellon, Carnegie Observatories
  • ,
  • C. Inserra, Cardiff University
  • ,
  • C. Gonzalez, Carnegie Observatories
  • ,
  • P. Marples, Leyburn Observatory
  • ,
  • S. Parker, Parkdales Observatory
  • ,
  • D. Reichart, University of North Carolina at Chapel Hill
  • ,
  • S. Torres-Robledo, Carnegie Observatories, SOAR Telescope
  • ,
  • D. R. Young, Queen's University Belfast
We present optical and near-infrared broadband photometry and optical spectra of AT 2014ej from the the Carnegie Supernova Project-II. These observations are complemented with data from the CHilean Automatic Supernova sEarch, the Public ESO Spectroscopic Survey of Transient Objects, and from the Backyard Observatory Supernova Search. Observational signatures of AT 2014ej reveal that it is similar to other members of the gap-transient subclass known as luminous red novae (LRNe), including the ubiquitous double hump light curve and spectral properties akin to the LRN SN 2017jfs. A medium-dispersion, visual-wavelength spectrum of AT 2014ej taken the Magellan Clay telescope, exhibits a P Cygni H$\alpha$ feature characterized by a blue velocity at zero intensity of $\approx 110$ km s$^{-1}$ and a P Cygni minimum velocity of $\approx70$ km s$^{-1}$, and which we attribute to emission from a circumstellar wind. Inspection of pre-outbust Hubble Space Telescope images yields no conclusive progenitor detection. In comparison with a sample of LRNe from the literature, AT 2014ej lies among the brighter end of the luminosity distribution. Comparison of the ultra-violet, optical, infrared (UVOIR) light curves of well-observed LRNe to common-envelope evolution models from the literature, indicates the models under predict the luminosity of the comparison sample at all phases and also produce inconsistent time-scales of the secondary peak. Future efforts to model LRNe should expand upon the current parameter space explored and therefore may consider more massive systems and a wider range of dynamical timescales.
OriginalsprogEngelsk
ArtikelnummerA104
TidsskriftAstronomy & Astrophysics
Vol/bind639
Antal sider19
ISSN0004-6361
DOI
StatusUdgivet - jul. 2020

    Forskningsområder

  • astro-ph.HE, astro-ph.SR

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