2018/05/08 by Thomas de Jaeger, L. Galbany, Lluis Galbany +28
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Ejecta #Emission spectrum #Galaxy #Gamma-ray bursts and supernovae #Light curve #Luminosity #Pair-instability supernova #Photometry (optics) #Physics #Spectral energy distribution #Spectral line #Spectroscopy #Stars #Supernova #Type II supernova #astro-ph.HE
paper · pdf · doi:10.1093/mnras/sty1218
Accepted for publication in MNRAS. 19 pages, including 18 figures and 5 tables
arxiv created 2018/05/08 · openalex publication_date 2018/05/09 · openalex created_date 2018/05/17 · arxiv updated 2018/05/23 · openalex updated_date 2026/08/06
We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN II) 2016esw in CGCG 229-009 from the first day after the explosion up to 120 d. Its light-curve shape is similar to that of a typical SN II; however, SN 2016esw is near the high-luminosity end of the SN II distribution, with a peak of |M\rm maxV=-18.36| mag. The V-band light curve exhibits a long recombination phase for a SN II (similar to the long-lived plateau of SN 2004et). Considering the well-known relation between the luminosity and the plateau decline rate, SN 2016esw should have a V-band slope of ∼2.10 mag (100 d)−1; however, SN 2016esw has a substantially flatter plateau with a slope of 1.01 ± 0.26 mag (100 d)−1, perhaps indicating that interacting Type II supernovae are not useful for cosmology. At 19.5 d post-explosion, the spectrum presents a boxy H α emission line with flat absorption profiles, suggesting interaction between the ejecta and circumstellar matter. Finally, based on the spectral properties, SN 2016esw shows similarities with the luminous and interacting SN 2007pk at early epochs, particularly in terms of observable line features and their evolution.