The electron-capture origin of supernova 2018zd
In the transitional mass range (~8–10 solar masses) between white dwarf formation and iron core-collapse supernovae, stars are expected to produce an electron-capture supernova. Theoretically, these progenitors are thought to be super-asymptotic giant branch stars with a degenerate O + Ne + Mg core,...
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2021
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/126415 |
| Aporte de: |
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I19-R120-10915-126415 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Stellar evolution Physics Supernova Light curve Stars Solar mass White dwarf Nucleosynthesis Astrophysics Emission spectrum Neutron star Black hole |
| spellingShingle |
Ciencias Astronómicas Stellar evolution Physics Supernova Light curve Stars Solar mass White dwarf Nucleosynthesis Astrophysics Emission spectrum Neutron star Black hole Hiramatsu, Daichi Howell, D. Andrew Van Dyk, Schuyler D. Goldberg, Jared A. Maeda, Keiichi Moriya, Takashi J. Tominaga, Nozomu Nomoto, Ken’ichi Hosseinzadeh, Griffin Arcavi, Iair McCully, Curtis Burke, Jamison Bostroem, K. Azalee Valenti, Stefano Dong, Yize Brown, Peter J. Andrews, Jennifer E. Bilinski, Christopher Williams, G. Grant Smith, Paul S. Smith, Nathan Sand, David J. Anand, Gagandeep S. Xu, Chengyuan Filippenko, Alexei V. Bersten, Melina Cecilia Folatelli, Gastón Kelly, Patrick L. Noguchi, Toshihide Itagaki, Koichi The electron-capture origin of supernova 2018zd |
| topic_facet |
Ciencias Astronómicas Stellar evolution Physics Supernova Light curve Stars Solar mass White dwarf Nucleosynthesis Astrophysics Emission spectrum Neutron star Black hole |
| description |
In the transitional mass range (~8–10 solar masses) between white dwarf formation and iron core-collapse supernovae, stars are expected to produce an electron-capture supernova. Theoretically, these progenitors are thought to be super-asymptotic giant branch stars with a degenerate O + Ne + Mg core, and electron capture onto Ne and Mg nuclei should initiate core collapse1–4. However, no supernovae have unequivocally been identified from an electron-capture origin, partly because of uncertainty in theoretical predictions. Here we present six indicators of electron-capture supernovae and show that supernova 2018zd is the only known supernova with strong evidence for or consistent with all six: progenitor identification, circumstellar material, chemical composition5–7, explosion energy, light curve and nucleosynthesis8–12. For supernova 2018zd, we infer a super-asymptotic giant branch progenitor based on the faint candidate in the pre-explosion images and the chemically enriched circumstellar material revealed by the early ultraviolet colours and flash spectroscopy. The light-curve morphology and nebular emission lines can be explained by the low explosion energy and neutron-rich nucleosynthesis produced in an electron-capture supernova. This identification provides insights into the complex stellar evolution, supernova physics, cosmic nucleosynthesis and remnant populations in the transitional mass range. Electron-capture supernovae are thought to come from progenitors with a narrow range of masses, and thus they are rare. Here the authors present six indicators of an electron-capture supernova origin, and find that supernova 2018zd fulfils all six criteria. |
| format |
Articulo Preprint |
| author |
Hiramatsu, Daichi Howell, D. Andrew Van Dyk, Schuyler D. Goldberg, Jared A. Maeda, Keiichi Moriya, Takashi J. Tominaga, Nozomu Nomoto, Ken’ichi Hosseinzadeh, Griffin Arcavi, Iair McCully, Curtis Burke, Jamison Bostroem, K. Azalee Valenti, Stefano Dong, Yize Brown, Peter J. Andrews, Jennifer E. Bilinski, Christopher Williams, G. Grant Smith, Paul S. Smith, Nathan Sand, David J. Anand, Gagandeep S. Xu, Chengyuan Filippenko, Alexei V. Bersten, Melina Cecilia Folatelli, Gastón Kelly, Patrick L. Noguchi, Toshihide Itagaki, Koichi |
| author_facet |
Hiramatsu, Daichi Howell, D. Andrew Van Dyk, Schuyler D. Goldberg, Jared A. Maeda, Keiichi Moriya, Takashi J. Tominaga, Nozomu Nomoto, Ken’ichi Hosseinzadeh, Griffin Arcavi, Iair McCully, Curtis Burke, Jamison Bostroem, K. Azalee Valenti, Stefano Dong, Yize Brown, Peter J. Andrews, Jennifer E. Bilinski, Christopher Williams, G. Grant Smith, Paul S. Smith, Nathan Sand, David J. Anand, Gagandeep S. Xu, Chengyuan Filippenko, Alexei V. Bersten, Melina Cecilia Folatelli, Gastón Kelly, Patrick L. Noguchi, Toshihide Itagaki, Koichi |
| author_sort |
Hiramatsu, Daichi |
| title |
The electron-capture origin of supernova 2018zd |
| title_short |
The electron-capture origin of supernova 2018zd |
| title_full |
The electron-capture origin of supernova 2018zd |
| title_fullStr |
The electron-capture origin of supernova 2018zd |
| title_full_unstemmed |
The electron-capture origin of supernova 2018zd |
| title_sort |
electron-capture origin of supernova 2018zd |
| publishDate |
2021 |
| url |
http://sedici.unlp.edu.ar/handle/10915/126415 |
| work_keys_str_mv |
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