Broad-lined Supernova 2016coi with a Helium Envelope

We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that spectra up to t = 12 days exhibited the He i λ5876, λ6...

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Published inThe Astrophysical journal Vol. 837; no. 1; pp. 1 - 8
Main Authors Yamanaka, Masayuki, Nakaoka, Tatsuya, Tanaka, Masaomi, Maeda, Keiichi, Honda, Satoshi, Hanayama, Hidekazu, Morokuma, Tomoki, Imai, Masataka, Kinugasa, Kenzo, Murata, Katsuhiro L., Nishimori, Takefumi, Hashimoto, Osamu, Gima, Hirotaka, Hosoya, Kensuke, Ito, Ayano, Karita, Mayu, Kawabata, Miho, Morihana, Kumiko, Morikawa, Yuto, Murakami, Kotone, Nagayama, Takahiro, Ono, Tatsuharu, Onozato, Hiroki, Sarugaku, Yuki, Sato, Mitsuteru, Suzuki, Daisuke, Takahashi, Jun, Takayama, Masaki, Yaguchi, Hijiri, Akitaya, Hiroshi, Asakura, Yuichiro, Kawabata, Koji S., Kuroda, Daisuke, Nogami, Daisaku, Oasa, Yumiko, Omodaka, Toshihiro, Saito, Yoshihiko, Sekiguchi, Kazuhiro, Tominaga, Nozomu, Uemura, Makoto, Watanabe, Makoto
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 01.03.2017
IOP Publishing
Subjects
ABSORPTION
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DETECTION
Ejecta
EXPLOSIONS
HELIUM
KINETIC ENERGY
Light curve
MASS
SPECTRA
Supernova
SUPERNOVAE
supernovae: general
supernovae: individual (SN 2016coi, SNe 1998bw, 2008D, 2009bb, 2012au)
TYPE I SUPERNOVAE
VELOCITY
VISIBLE RADIATION
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Abstract We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that spectra up to t = 12 days exhibited the He i λ5876, λ6678, and λ7065 absorption lines. We show that the smoothed and blueshifted spectra of normal SNe Ib are remarkably similar to the observed spectrum of SN 2016coi. The line velocities of SN 2016coi were similar to those of SNe Ic-BL and significantly faster than those of SNe Ib. Analyses of the line velocity and light curve suggest that the kinetic energy and the total ejecta mass of SN 2016coi are similar to those of SNe Ic-BL. Together with BL SNe 2009bb and 2012ap, for which the detection of He i was also reported, these SNe could be transitional objects between SNe Ic-BL and SNe Ib, and be classified as BL Type "Ib" SNe (SNe "Ib"-BL). Our work demonstrates the diversity of the outermost layer in BL SNe, which should be related to the variety of the evolutionary paths.
AbstractList We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that spectra up to t = 12 days exhibited the He i λ5876, λ6678, and λ7065 absorption lines. We show that the smoothed and blueshifted spectra of normal SNe Ib are remarkably similar to the observed spectrum of SN 2016coi. The line velocities of SN 2016coi were similar to those of SNe Ic-BL and significantly faster than those of SNe Ib. Analyses of the line velocity and light curve suggest that the kinetic energy and the total ejecta mass of SN 2016coi are similar to those of SNe Ic-BL. Together with BL SNe 2009bb and 2012ap, for which the detection of He i was also reported, these SNe could be transitional objects between SNe Ic-BL and SNe Ib, and be classified as BL Type "Ib" SNe (SNe "Ib"-BL). Our work demonstrates the diversity of the outermost layer in BL SNe, which should be related to the variety of the evolutionary paths.
We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that spectra up to t = 12 days exhibited the He i λ 5876, λ 6678, and λ 7065 absorption lines. We show that the smoothed and blueshifted spectra of normal SNe Ib are remarkably similar to the observed spectrum of SN 2016coi. The line velocities of SN 2016coi were similar to those of SNe Ic-BL and significantly faster than those of SNe Ib. Analyses of the line velocity and light curve suggest that the kinetic energy and the total ejecta mass of SN 2016coi are similar to those of SNe Ic-BL. Together with BL SNe 2009bb and 2012ap, for which the detection of He i was also reported, these SNe could be transitional objects between SNe Ic-BL and SNe Ib, and be classified as BL Type “Ib” SNe (SNe “Ib”-BL). Our work demonstrates the diversity of the outermost layer in BL SNe, which should be related to the variety of the evolutionary paths.
Abstract We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t  = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that spectra up to t  = 12 days exhibited the He i λ 5876, λ 6678, and λ 7065 absorption lines. We show that the smoothed and blueshifted spectra of normal SNe Ib are remarkably similar to the observed spectrum of SN 2016coi. The line velocities of SN 2016coi were similar to those of SNe Ic-BL and significantly faster than those of SNe Ib. Analyses of the line velocity and light curve suggest that the kinetic energy and the total ejecta mass of SN 2016coi are similar to those of SNe Ic-BL. Together with BL SNe 2009bb and 2012ap, for which the detection of He i was also reported, these SNe could be transitional objects between SNe Ic-BL and SNe Ib, and be classified as BL Type “Ib” SNe (SNe “Ib”-BL). Our work demonstrates the diversity of the outermost layer in BL SNe, which should be related to the variety of the evolutionary paths.
Author Nishimori, Takefumi
Sarugaku, Yuki
Hashimoto, Osamu
Takayama, Masaki
Uemura, Makoto
Honda, Satoshi
Onozato, Hiroki
Watanabe, Makoto
Kinugasa, Kenzo
Kawabata, Miho
Murakami, Kotone
Morihana, Kumiko
Nagayama, Takahiro
Kawabata, Koji S.
Sekiguchi, Kazuhiro
Asakura, Yuichiro
Oasa, Yumiko
Suzuki, Daisuke
Murata, Katsuhiro L.
Ono, Tatsuharu
Ito, Ayano
Hanayama, Hidekazu
Maeda, Keiichi
Karita, Mayu
Omodaka, Toshihiro
Sato, Mitsuteru
Nogami, Daisaku
Yamanaka, Masayuki
Saito, Yoshihiko
Akitaya, Hiroshi
Nakaoka, Tatsuya
Kuroda, Daisuke
Imai, Masataka
Takahashi, Jun
Tominaga, Nozomu
Hosoya, Kensuke
Yaguchi, Hijiri
Morokuma, Tomoki
Gima, Hirotaka
Morikawa, Yuto
Tanaka, Masaomi
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Snippet We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion...
Abstract We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t  = 7 to 67 days after the estimated...
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SubjectTerms ABSORPTION
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DETECTION
Ejecta
EXPLOSIONS
HELIUM
KINETIC ENERGY
Light curve
MASS
SPECTRA
Supernova
SUPERNOVAE
supernovae: general
supernovae: individual (SN 2016coi, SNe 1998bw, 2008D, 2009bb, 2012au)
TYPE I SUPERNOVAE
VELOCITY
VISIBLE RADIATION
Title Broad-lined Supernova 2016coi with a Helium Envelope
URI https://iopscience.iop.org/article/10.3847/1538-4357/aa5f57
https://www.proquest.com/docview/2365926996
https://www.osti.gov/biblio/22661345
Volume 837
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