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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SN 2019ein: New insights into the similarities and diversity among high-velocity type ia supernovae
Astrophysical Journal, Volume 893, No. 2, Article 143, Year 2020
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Description
We present optical observations of the Type Ia supernova (SN) 2019ein, starting two days after the estimated explosion date. The spectra and light curves show that SN 2019ein belongs to a high-velocity (HV) and broad-line group with a relatively rapid decline in the light curves (Δm 15(B) = 1.36 ± 0.02 mag) and a short rise time (15.37 ± 0.55 days). The Si ii λ6355 velocity, associated with a photospheric component but not with a detached high-velocity feature, reached ∼20,000 km s-1 12 days before the B-band maximum. The line velocity, however, decreased very rapidly and smoothly toward maximum light, to ∼13,000 km s-1, which is relatively low among HV SNe. This indicates that the speed of the spectral evolution of HV SNe Ia is correlated with not only the velocity at maximum light, but also the light-curve decline rate, as is the case for normal-velocity (NV) SNe Ia. Spectral synthesis modeling shows that the outermost layer at >17,000 km s-1 is well described by an O-Ne-C burning layer extending to at least 25,000 km s-1, and there is no unburnt carbon below 30,000 km s-1; these properties are largely consistent with the delayed detonation scenario and are shared with the prototypical HV SN 2002bo despite the large difference in Δm 15(B). This structure is strikingly different from that derived for the well-studied NV SN 2011fe. We suggest that the relation between the mass of 56Ni (or Δm 15) and the extent of the O-Ne-C burning layer provides an important constraint on the explosion mechanism(s) of HV and NV SNe. © 2020. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Kawabata, Miho
Japan, Kyoto
Kyoto University
Maeda, Kei'ichi
Japan, Kyoto
Kyoto University
Yamanaka, Masayuki
Japan, Kyoto
Kyoto University
Nakaoka, Tatsuya
Japan, Higashihiroshima
Hiroshima University
Kawabata, Koji S.
Japan, Higashihiroshima
Hiroshima University
Akitaya, Hiroshi
Japan, Higashihiroshima
Hiroshima University
Hanayama, Hidekazu
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Horiuchi, Takashi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Isogai, Keisuke I.
Japan, Kyoto
Kyoto University
Jiang, Jian
Japan, Tokyo
The University of Tokyo
Kino, Masaru
Japan, Kyoto
Kyoto University
Kuroda, Daisuke
Japan, Kyoto
Kyoto University
Maehara, Hiroyuki
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Matsubayashi, Kazuya
Japan, Kyoto
Kyoto University
Morihana, Kumiko
Japan, Nagoya
Nagoya University
Murata, Katsuhiro L.
Japan, Tokyo
Tokyo Institute of Technology
Nogami, Daisaku
Japan, Kyoto
Kyoto University
Onozato, Hiroki
Japan, Kobe
University of Hyogo
Otsuka, Masaaki
Japan, Kyoto
Kyoto University
Saito, Tomoki
Japan, Kobe
University of Hyogo
Sasada, Mahito
Japan, Higashihiroshima
Hiroshima University
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Taguchi, Kenta
Japan, Kyoto
Kyoto University
Takahashi, Jun
Japan, Kobe
University of Hyogo
Takagi, Kengo
Japan, Higashihiroshima
Hiroshima University
Takagi, Seiko
Japan, Sapporo
Hokkaido University
Takayama, Masaki
Japan, Kobe
University of Hyogo
Sekiguchi, Kazuhiro
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Statistics
Citations: 18
Authors: 27
Affiliations: 10
Identifiers
Doi:
10.3847/1538-4357/ab8236
ISSN:
0004637X
Research Areas
Environmental