SN 2023xwi: forbidden line emission in the peak spectrum of a Ca-strong transient
SN 2023xwi: forbidden line emission in the peak spectrum of a Ca-strong transient
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.
novae, cataclysmic variables, supernovae: general, supernovae: individual: SN 2023xwi, white dwarfs
1015-1027
Touchard-Paxton, C.-G
51658021-1d30-4f08-a046-081fa0ed5feb
Frohmaier, C.
e752dabb-bbdc-430d-ac86-861ea58d0e1b
Pursiainen, M.
86aac19a-a662-48d9-a58c-3325e4d51636
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Polin, A.
24811542-b299-4098-903c-8d405075e023
Dimitriadis, G.
d5581a68-dfae-40ed-9bc8-0bc82106396c
Galbany, L.
76c0f594-2419-43d1-8c38-6429ecad4a03
Killestein, T.L.
f7b84e58-d56e-4153-a596-af23ede80a03
Kumar, A.
f4964134-e747-4adf-9762-8746fbbad3e8
Lyman, J.
bbbac0d4-6f7b-46d0-9a32-ab9a7ea79499
29 January 2025
Touchard-Paxton, C.-G
51658021-1d30-4f08-a046-081fa0ed5feb
Frohmaier, C.
e752dabb-bbdc-430d-ac86-861ea58d0e1b
Pursiainen, M.
86aac19a-a662-48d9-a58c-3325e4d51636
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Polin, A.
24811542-b299-4098-903c-8d405075e023
Dimitriadis, G.
d5581a68-dfae-40ed-9bc8-0bc82106396c
Galbany, L.
76c0f594-2419-43d1-8c38-6429ecad4a03
Killestein, T.L.
f7b84e58-d56e-4153-a596-af23ede80a03
Kumar, A.
f4964134-e747-4adf-9762-8746fbbad3e8
Lyman, J.
bbbac0d4-6f7b-46d0-9a32-ab9a7ea79499
Touchard-Paxton, C.-G, Frohmaier, C., Pursiainen, M., Sullivan, M., Polin, A., Dimitriadis, G., Galbany, L., Killestein, T.L., Kumar, A. and 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), .
(doi:10.1093/mnras/staf069).
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.
Text
2501.07226v1
- Author's Original
Text
staf069
- Version of Record
More information
Accepted/In Press date: 27 December 2024
e-pub ahead of print date: 14 January 2025
Published date: 29 January 2025
Keywords:
novae, cataclysmic variables, supernovae: general, supernovae: individual: SN 2023xwi, white dwarfs
Identifiers
Local EPrints ID: 498524
URI: http://eprints.soton.ac.uk/id/eprint/498524
ISSN: 1365-2966
PURE UUID: 4de62dd2-0baa-4996-9ac6-6297e5a67f2a
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Date deposited: 20 Feb 2025 17:53
Last modified: 10 Apr 2025 02:08
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Contributors
Author:
C.-G Touchard-Paxton
Author:
M. Pursiainen
Author:
A. Polin
Author:
G. Dimitriadis
Author:
L. Galbany
Author:
T.L. Killestein
Author:
A. Kumar
Author:
J. Lyman
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