Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf
We present photometric and spectroscopic data for the nearby Type I supernova (SN Ia) 2019eix (originally classified as an SN Ic), from the day of its discovery up to 100 days after maximum brightness. Before maximum light, SN 2019eix resembles a typical SN Ic, albeit lacking the usual O i feature....
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acdd6a |
| _version_ | 1797697238532620288 |
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| author | E. Padilla Gonzalez D. Andrew Howell J. Burke Yize Dong D. Hiramatsu C. McCully C. Pellegrino W. Kerzendorf M. Modjaz G. Terreran M. Williamson |
| author_facet | E. Padilla Gonzalez D. Andrew Howell J. Burke Yize Dong D. Hiramatsu C. McCully C. Pellegrino W. Kerzendorf M. Modjaz G. Terreran M. Williamson |
| author_sort | E. Padilla Gonzalez |
| collection | DOAJ |
| description | We present photometric and spectroscopic data for the nearby Type I supernova (SN Ia) 2019eix (originally classified as an SN Ic), from the day of its discovery up to 100 days after maximum brightness. Before maximum light, SN 2019eix resembles a typical SN Ic, albeit lacking the usual O i feature. Its light curve is similar to the typical SN Ic with decline rates (Δ M _15, _V = 0.84) and absolute magnitude M _V = −18.35. However, after maximum light, this SN has unusual spectroscopic features, a large degree of line blending, significant line blanketing in the blue ( λ < 5000 Å), and strong Ca ii absorption features during and after peak brightness. These unusual spectral features are similar to models of subluminous thermonuclear explosions, specifically double-detonation models of SNe Ia. Photometrically, SN 2019eix appears to be somewhat brighter with slower decline rates than other double-detonation candidates. We modeled the spectra using the radiative-transfer code TARDIS using SN 1994I (an SN Ic) as a base model to see whether we could reproduce the unusual features of SN 2019eix and found them to be consistent with the exception of the O i feature. We also compared SN 2019eix with double-detonation models and found them to best match the observations of SN 2019eix, but failed to reproduce its full photometric and spectroscopic evolution. |
| first_indexed | 2024-03-12T03:36:24Z |
| format | Article |
| id | doaj.art-1e4a152aed29480192d9a3adb0b413bd |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:36:24Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-1e4a152aed29480192d9a3adb0b413bd2023-09-03T13:08:10ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195312510.3847/1538-4357/acdd6aPeculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White DwarfE. Padilla Gonzalez0https://orcid.org/0000-0003-0209-9246D. Andrew Howell1https://orcid.org/0000-0003-4253-656XJ. Burke2https://orcid.org/0000-0003-0035-6659Yize Dong3https://orcid.org/0000-0002-7937-6371D. Hiramatsu4https://orcid.org/0000-0002-1125-9187C. McCully5https://orcid.org/0000-0001-5807-7893C. Pellegrino6https://orcid.org/0000-0002-7472-1279W. Kerzendorf7https://orcid.org/0000-0002-0479-7235M. Modjaz8https://orcid.org/0000-0001-7132-0333G. Terreran9https://orcid.org/0000-0003-0794-5982M. Williamson10https://orcid.org/0000-0003-2544-4516Department of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics and Astronomy, University of California , 1 Shields Avenue, Davis, CA 95616-5270, USADepartment of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics and Astronomy, Michigan State University , East Lansing, MI 48824, USA; Department of Computational Mathematics, Science, and Engineering, Michigan State University , East Lansing, MI 48824, USADepartment of Astronomy, University of Virginia , Charlottesville, VA 22904, USALas Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USADepartment of Physics, New York University , New York, NY 10003, USAWe present photometric and spectroscopic data for the nearby Type I supernova (SN Ia) 2019eix (originally classified as an SN Ic), from the day of its discovery up to 100 days after maximum brightness. Before maximum light, SN 2019eix resembles a typical SN Ic, albeit lacking the usual O i feature. Its light curve is similar to the typical SN Ic with decline rates (Δ M _15, _V = 0.84) and absolute magnitude M _V = −18.35. However, after maximum light, this SN has unusual spectroscopic features, a large degree of line blending, significant line blanketing in the blue ( λ < 5000 Å), and strong Ca ii absorption features during and after peak brightness. These unusual spectral features are similar to models of subluminous thermonuclear explosions, specifically double-detonation models of SNe Ia. Photometrically, SN 2019eix appears to be somewhat brighter with slower decline rates than other double-detonation candidates. We modeled the spectra using the radiative-transfer code TARDIS using SN 1994I (an SN Ic) as a base model to see whether we could reproduce the unusual features of SN 2019eix and found them to be consistent with the exception of the O i feature. We also compared SN 2019eix with double-detonation models and found them to best match the observations of SN 2019eix, but failed to reproduce its full photometric and spectroscopic evolution.https://doi.org/10.3847/1538-4357/acdd6aSupernovae |
| spellingShingle | E. Padilla Gonzalez D. Andrew Howell J. Burke Yize Dong D. Hiramatsu C. McCully C. Pellegrino W. Kerzendorf M. Modjaz G. Terreran M. Williamson Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf The Astrophysical Journal Supernovae |
| title | Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf |
| title_full | Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf |
| title_fullStr | Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf |
| title_full_unstemmed | Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf |
| title_short | Peculiar Spectral Evolution of the Type I Supernova 2019eix: A Possible Double Detonation from a Helium Shell on a Sub-Chandrasekhar-mass White Dwarf |
| title_sort | peculiar spectral evolution of the type i supernova 2019eix a possible double detonation from a helium shell on a sub chandrasekhar mass white dwarf |
| topic | Supernovae |
| url | https://doi.org/10.3847/1538-4357/acdd6a |
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