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SN 2016esw: a luminous Type II supernova observed within the first day after the explosion

SN 2016esw: a luminous Type II supernova observed within the first day after the explosion
SN 2016esw: a luminous Type II supernova observed within the first day after the explosion
We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN) 2016esw in CGCG~229-009 from the first day after the explosion up to 120 days. 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 MmaxV=−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 days)−1; however, SN 2016esw has a substantially flatter plateau with a slope of 1.01±0.26 mag (100 days)−1, perhaps indicating that interacting Type II supernovae are not useful for cosmology. At 19.5 days post-explosion, the spectrum presents a boxy Hα 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.
0035-8711
3776-3792
de Jaeger, T.
e45519a3-dfd2-4cbc-8a82-afd29f84d357
Galbany, Lluís
53211706-78b6-4666-b078-e19b0273a513
Gutierrez Avendano, Claudia Patrici
14464da3-b453-4980-bff2-b22afa4b4366
Filippenko, Alexei V.
e1c44e71-0c02-436e-8fd6-3a8cf5a1b215
Zheng, WeiKang
be738231-de5e-4ca4-b446-a95a441af1e1
Brink, Thomas G.
ed17fb10-8fab-4b19-9b73-3126d624d43a
Foley, Ryan J.
135282e0-7cdc-429c-9913-9122dda1cb7c
Sánchez, Sebastian F.
04157fb4-f216-48fc-b3f5-e5424b82af3e
Channa, Sanyum
68cc3798-af10-4c05-8824-1ce15739de10
de Jaeger, T.
e45519a3-dfd2-4cbc-8a82-afd29f84d357
Galbany, Lluís
53211706-78b6-4666-b078-e19b0273a513
Gutierrez Avendano, Claudia Patrici
14464da3-b453-4980-bff2-b22afa4b4366
Filippenko, Alexei V.
e1c44e71-0c02-436e-8fd6-3a8cf5a1b215
Zheng, WeiKang
be738231-de5e-4ca4-b446-a95a441af1e1
Brink, Thomas G.
ed17fb10-8fab-4b19-9b73-3126d624d43a
Foley, Ryan J.
135282e0-7cdc-429c-9913-9122dda1cb7c
Sánchez, Sebastian F.
04157fb4-f216-48fc-b3f5-e5424b82af3e
Channa, Sanyum
68cc3798-af10-4c05-8824-1ce15739de10

de Jaeger, T., Galbany, Lluís, Gutierrez Avendano, Claudia Patrici, Filippenko, Alexei V., Zheng, WeiKang, Brink, Thomas G., Foley, Ryan J., Sánchez, Sebastian F. and Channa, Sanyum (2018) SN 2016esw: a luminous Type II supernova observed within the first day after the explosion. Monthly Notices of the Royal Astronomical Society, 478 (3), 3776-3792. (doi:10.1093/mnras/sty1218).

Record type: Article

Abstract

We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN) 2016esw in CGCG~229-009 from the first day after the explosion up to 120 days. 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 MmaxV=−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 days)−1; however, SN 2016esw has a substantially flatter plateau with a slope of 1.01±0.26 mag (100 days)−1, perhaps indicating that interacting Type II supernovae are not useful for cosmology. At 19.5 days post-explosion, the spectrum presents a boxy Hα 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.

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SN 2016esw: a luminous Type II supernova observed - Accepted Manuscript
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Accepted/In Press date: 5 May 2018
Published date: August 2018

Identifiers

Local EPrints ID: 420875
URI: http://eprints.soton.ac.uk/id/eprint/420875
ISSN: 0035-8711
PURE UUID: f8617cc0-7715-49e3-88ff-0c2851d6d560

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Date deposited: 17 May 2018 16:30
Last modified: 16 Dec 2019 18:14

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