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SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient

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SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient. / Touchard-Paxton, C-G; Frohmaier, C; Pursiainen, M et al.
In: Monthly Notices of the Royal Astronomical Society, Vol. 537, No. 2, 28.02.2025, p. 1015-1027.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Touchard-Paxton, C-G, Frohmaier, C, Pursiainen, M, Sullivan, M, Polin, A, Dimitriadis, G, Galbany, L, Killestein, TL, Kumar, A & Lyman, J 2025, 'SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient', Monthly Notices of the Royal Astronomical Society, vol. 537, no. 2, pp. 1015-1027. https://doi.org/10.1093/mnras/staf069

APA

Touchard-Paxton, C.-G., Frohmaier, C., Pursiainen, M., Sullivan, M., Polin, A., Dimitriadis, G., Galbany, L., Killestein, T. L., Kumar, A., & Lyman, J. (2025). SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient. Monthly Notices of the Royal Astronomical Society, 537(2), 1015-1027. https://doi.org/10.1093/mnras/staf069

Vancouver

Touchard-Paxton CG, Frohmaier C, Pursiainen M, Sullivan M, Polin A, Dimitriadis G et al. SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient. Monthly Notices of the Royal Astronomical Society. 2025 Feb 28;537(2):1015-1027. Epub 2025 Jan 14. doi: 10.1093/mnras/staf069

Author

Touchard-Paxton, C-G ; Frohmaier, C ; Pursiainen, M et al. / SN 2023xwi : Forbidden line emission in the peak spectrum of a Ca-strong transient. In: Monthly Notices of the Royal Astronomical Society. 2025 ; Vol. 537, No. 2. pp. 1015-1027.

Bibtex

@article{0b6379f5c13c40109011bc12ef71f7fe,
title = "SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient",
abstract = "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.",
author = "C-G Touchard-Paxton and C Frohmaier and M Pursiainen and M Sullivan and A Polin and G Dimitriadis and L Galbany and Killestein, {T L} and A Kumar and J Lyman",
year = "2025",
month = feb,
day = "28",
doi = "10.1093/mnras/staf069",
language = "English",
volume = "537",
pages = "1015--1027",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS

TY - JOUR

T1 - SN 2023xwi

T2 - Forbidden line emission in the peak spectrum of a Ca-strong transient

AU - Touchard-Paxton, C-G

AU - Frohmaier, C

AU - Pursiainen, M

AU - Sullivan, M

AU - Polin, A

AU - Dimitriadis, G

AU - Galbany, L

AU - Killestein, T L

AU - Kumar, A

AU - Lyman, J

PY - 2025/2/28

Y1 - 2025/2/28

N2 - 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.

AB - 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.

U2 - 10.1093/mnras/staf069

DO - 10.1093/mnras/staf069

M3 - Journal article

VL - 537

SP - 1015

EP - 1027

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -