Broad-lined Supernova 2016coi with a Helium Envelope

Masayuki Yamanaka; Tatsuya Nakaoka; Masaomi Tanaka; Keiichi Maeda; Satoshi Honda; Hidekazu Hanayama; Tomoki Morokuma; Masataka Imai; Kenzo Kinugasa; Katsuhiro L. Murata; Takefumi Nishimori; Osamu Hashimoto; Hirotaka Gima; Kensuke Hosoya; Ayano Ito; Mayu Karita; Miho Kawabata; Kumiko Morihana; Yuto Morikawa; Kotone Murakami; Takahiro Nagayama; Tatsuharu Ono; Hiroki Onozato; Yuki Sarugaku; Mitsuteru Sato; Daisuke Suzuki; Jun Takahashi; Masaki Takayama; Hijiri Yaguchi; Hiroshi Akitaya; Yuichiro Asakura; Koji S. Kawabata; Daisuke Kuroda; Daisaku Nogami; Yumiko Oasa; Toshihiro Omodaka; Yoshihiko Saito; Kazuhiro Sekiguchi; Nozomu Tominaga; Makoto Uemura; Makoto Watanabe

doi:10.3847/1538-4357/aa5f57

Broad-lined Supernova 2016coi with a Helium Envelope

Masayuki Yamanaka, Tatsuya Nakaoka, Masaomi Tanaka, Keiichi Maeda, Satoshi Honda, Hidekazu Hanayama, Tomoki Morokuma, Masataka Imai, Kenzo Kinugasa, Katsuhiro L. Murata, Takefumi Nishimori, Osamu Hashimoto, Hirotaka Gima, Kensuke Hosoya, Ayano Ito, Mayu Karita, Miho Kawabata, Kumiko Morihana, Yuto Morikawa, Kotone MurakamiTakahiro Nagayama, Tatsuharu Ono, Hiroki Onozato, Yuki Sarugaku, Mitsuteru Sato, Daisuke Suzuki, Jun Takahashi, Masaki Takayama, Hijiri Yaguchi, Hiroshi Akitaya, Yuichiro Asakura, Koji S. Kawabata, Daisuke Kuroda, Daisaku Nogami, Yumiko Oasa, Toshihiro Omodaka, Yoshihiko Saito, Kazuhiro Sekiguchi, Nozomu Tominaga, Makoto Uemura, Makoto Watanabe

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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.

Original language	English
Article number	1
Journal	Astrophysical Journal
Volume	837
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa5f57
Publication status	Published - 2017 Mar 1

Keywords

supernovae: general
supernovae: individual (SN 2016coi, SNe 1998bw, 2008D, 2009bb, 2012au)

Access to Document

10.3847/1538-4357/aa5f57

Cite this

Yamanaka, M., Nakaoka, T., Tanaka, M., Maeda, K., Honda, S., Hanayama, H., Morokuma, T., Imai, M., Kinugasa, K., Murata, K. L., Nishimori, T., Hashimoto, O., Gima, H., Hosoya, K., Ito, A., Karita, M., Kawabata, M., Morihana, K., Morikawa, Y., ... Watanabe, M. (2017). Broad-lined Supernova 2016coi with a Helium Envelope. Astrophysical Journal, 837(1), Article 1. https://doi.org/10.3847/1538-4357/aa5f57

@article{29761d2b9f3d42bdb3b9ab52aa9e1ea5,

title = "Broad-lined Supernova 2016coi with a Helium Envelope",

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.",

keywords = "supernovae: general, supernovae: individual (SN 2016coi, SNe 1998bw, 2008D, 2009bb, 2012au)",

author = "Masayuki Yamanaka and Tatsuya Nakaoka and Masaomi Tanaka and Keiichi Maeda and Satoshi Honda and Hidekazu Hanayama and Tomoki Morokuma and Masataka Imai and Kenzo Kinugasa and Murata, {Katsuhiro L.} and Takefumi Nishimori and Osamu Hashimoto and Hirotaka Gima and Kensuke Hosoya and Ayano Ito and Mayu Karita and Miho Kawabata and Kumiko Morihana and Yuto Morikawa and Kotone Murakami and Takahiro Nagayama and Tatsuharu Ono and Hiroki Onozato and Yuki Sarugaku and Mitsuteru Sato and Daisuke Suzuki and Jun Takahashi and Masaki Takayama and Hijiri Yaguchi and Hiroshi Akitaya and Yuichiro Asakura and Kawabata, {Koji S.} and Daisuke Kuroda and Daisaku Nogami and Yumiko Oasa and Toshihiro Omodaka and Yoshihiko Saito and Kazuhiro Sekiguchi and Nozomu Tominaga and Makoto Uemura and Makoto Watanabe",

note = "Funding Information: This work was partly supported by the Grant-in-Aid for Scientific Research from JSPS (26800100, 15H02075, 15H00788). The work by K.M. is partly supported by WPI Initiative, Mext, Japan. Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved..",

year = "2017",

month = mar,

day = "1",

doi = "10.3847/1538-4357/aa5f57",

language = "English",

volume = "837",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Yamanaka, M, Nakaoka, T, Tanaka, M, Maeda, K, Honda, S, Hanayama, H, Morokuma, T, Imai, M, Kinugasa, K, Murata, KL, Nishimori, T, Hashimoto, O, Gima, H, Hosoya, K, Ito, A, Karita, M, Kawabata, M, Morihana, K, Morikawa, Y, Murakami, K, Nagayama, T, Ono, T, Onozato, H, Sarugaku, Y, Sato, M, Suzuki, D, Takahashi, J, Takayama, M, Yaguchi, H, Akitaya, H, Asakura, Y, Kawabata, KS, Kuroda, D, Nogami, D, Oasa, Y, Omodaka, T, Saito, Y, Sekiguchi, K, Tominaga, N, Uemura, M & Watanabe, M 2017, 'Broad-lined Supernova 2016coi with a Helium Envelope', Astrophysical Journal, vol. 837, no. 1, 1. https://doi.org/10.3847/1538-4357/aa5f57

TY - JOUR

T1 - Broad-lined Supernova 2016coi with a Helium Envelope

AU - Yamanaka, Masayuki

AU - Nakaoka, Tatsuya

AU - Tanaka, Masaomi

AU - Maeda, Keiichi

AU - Honda, Satoshi

AU - Hanayama, Hidekazu

AU - Morokuma, Tomoki

AU - Imai, Masataka

AU - Kinugasa, Kenzo

AU - Murata, Katsuhiro L.

AU - Nishimori, Takefumi

AU - Hashimoto, Osamu

AU - Gima, Hirotaka

AU - Hosoya, Kensuke

AU - Ito, Ayano

AU - Karita, Mayu

AU - Kawabata, Miho

AU - Morihana, Kumiko

AU - Morikawa, Yuto

AU - Murakami, Kotone

AU - Nagayama, Takahiro

AU - Ono, Tatsuharu

AU - Onozato, Hiroki

AU - Sarugaku, Yuki

AU - Sato, Mitsuteru

AU - Suzuki, Daisuke

AU - Takahashi, Jun

AU - Takayama, Masaki

AU - Yaguchi, Hijiri

AU - Akitaya, Hiroshi

AU - Asakura, Yuichiro

AU - Kawabata, Koji S.

AU - Kuroda, Daisuke

AU - Nogami, Daisaku

AU - Oasa, Yumiko

AU - Omodaka, Toshihiro

AU - Saito, Yoshihiko

AU - Sekiguchi, Kazuhiro

AU - Tominaga, Nozomu

AU - Uemura, Makoto

AU - Watanabe, Makoto

N1 - Funding Information: This work was partly supported by the Grant-in-Aid for Scientific Research from JSPS (26800100, 15H02075, 15H00788). The work by K.M. is partly supported by WPI Initiative, Mext, Japan. Publisher Copyright: © 2017. The American Astronomical Society. All rights reserved..

PY - 2017/3/1

Y1 - 2017/3/1

N2 - 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.

AB - 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.

KW - supernovae: general

KW - supernovae: individual (SN 2016coi, SNe 1998bw, 2008D, 2009bb, 2012au)

UR - http://www.scopus.com/inward/record.url?scp=85015213531&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85015213531&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aa5f57

DO - 10.3847/1538-4357/aa5f57

M3 - Article

AN - SCOPUS:85015213531

SN - 0004-637X

VL - 837

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 1

ER -

Broad-lined Supernova 2016coi with a Helium Envelope

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this