SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866910782125506560 |
|---|---|
| author | Touchard-Paxton, C. -G. Frohmaier, C. Pursiainen, M. Sullivan, M. Polin, A. Dimitriadis, G. Galbany, L. Killestein, T. L. Kumar, A. Lyman, J. |
| author_facet | Touchard-Paxton, C. -G. Frohmaier, C. Pursiainen, M. Sullivan, M. Polin, A. Dimitriadis, G. Galbany, L. Killestein, T. L. Kumar, A. Lyman, J. |
| contents | We present an extensive optical photometric and spectroscopic investigation into the calcium-rich supernova (SN) - SN2023xwi. Observations from a variety of ground-based telescopes follow the SN from 8 days pre-peak brightness to 87 days post-peak, covering both early-time (photospheric) and late-time (nebular) phases of the supernova. Objects of this class are characterised by nebular spectra that are dominated by [Ca II] $λλ$ 7291, 7324 emission. SN 2023xwi displays a unique peculiarity in that its forbidden [Ca II] feature is visible in its peak photospheric spectrum - far earlier than expected in current models. This is one of the strongest and earliest detections of this feature in Ca-rich SNe in photospheric-phase spectra. We investigate the velocity evolution of this spectral feature and show that it cannot be easily explained by conventional progenitor systems. From our observations, we propose a SN progenitor embedded in an environment polluted by a recurrent He-nova AM CVn system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07226 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient Touchard-Paxton, C. -G. Frohmaier, C. Pursiainen, M. Sullivan, M. Polin, A. Dimitriadis, G. Galbany, L. Killestein, T. L. Kumar, A. Lyman, J. High Energy Astrophysical Phenomena We present an extensive optical photometric and spectroscopic investigation into the calcium-rich supernova (SN) - SN2023xwi. Observations from a variety of ground-based telescopes follow the SN from 8 days pre-peak brightness to 87 days post-peak, covering both early-time (photospheric) and late-time (nebular) phases of the supernova. Objects of this class are characterised by nebular spectra that are dominated by [Ca II] $λλ$ 7291, 7324 emission. SN 2023xwi displays a unique peculiarity in that its forbidden [Ca II] feature is visible in its peak photospheric spectrum - far earlier than expected in current models. This is one of the strongest and earliest detections of this feature in Ca-rich SNe in photospheric-phase spectra. We investigate the velocity evolution of this spectral feature and show that it cannot be easily explained by conventional progenitor systems. From our observations, we propose a SN progenitor embedded in an environment polluted by a recurrent He-nova AM CVn system. |
| title | SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2501.07226 |