Imagen de Portada

A thermonuclear supernova interacting with hydrogen- and helium-deficient circumstellar material. SN 2020aeuh as a SN Ia-CSM-C/O?

Fuente: arXiv

Guardado en:

Detalles Bibliográficos
Autores principales:	Tsalapatas, K., Sollerman, J., Chiba, R., Kool, E., Johansson, J., Rosswog, S., Schulze, S., Moriya, T. J., Andreoni, I., Brink, T. G., Chen, T. X., Covarrubias, S., De, K., Dimitriadis, G., Filippenko, A. V., Fremling, C., Gangopadhyay, A., Maguire, K., Mo, G., Sharma, Y., Sravan, N., Terwel, J. H., Yang, Y.
Formato:	Preprint
Publicado:	2025
Materias:	High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866914253000146944
author	Tsalapatas, K. Sollerman, J. Chiba, R. Kool, E. Johansson, J. Rosswog, S. Schulze, S. Moriya, T. J. Andreoni, I. Brink, T. G. Chen, T. X. Covarrubias, S. De, K. Dimitriadis, G. Filippenko, A. V. Fremling, C. Gangopadhyay, A. Maguire, K. Mo, G. Sharma, Y. Sravan, N. Terwel, J. H. Yang, Y.
author_facet	Tsalapatas, K. Sollerman, J. Chiba, R. Kool, E. Johansson, J. Rosswog, S. Schulze, S. Moriya, T. J. Andreoni, I. Brink, T. G. Chen, T. X. Covarrubias, S. De, K. Dimitriadis, G. Filippenko, A. V. Fremling, C. Gangopadhyay, A. Maguire, K. Mo, G. Sharma, Y. Sravan, N. Terwel, J. H. Yang, Y.
contents	Identifying the progenitors of thermonuclear supernovae (Type Ia supernovae; SNe Ia) remains a key objective in contemporary astronomy. The rare subclass of SNe Ia that interacts with circumstellar material (Type Ia-CSM) allows for studies of the progenitor's environment before explosion, and generally favours single-degenerate progenitor channels. The case of SN Ia-CSM PTF11kx clearly connected thermonuclear explosions with hydrogen-rich CSM-interacting events, and the more recent SN 2020eyj connected SNe Ia with helum-rich companion progenitors. Here we present a study of SN 2020aeuh, a Type Ia-CSM with delayed interaction. We analyse photometric and spectroscopic data that monitor the evolution of SN 2020aeuh and compare its properties with those of peculiar SNe Ia and core-collapse SNe. At early times, the evolution of SN 2020aeuh resembles a slightly overluminous SN Ia. Later, the interaction-dominated spectra develop the same pseudocontinuum seen in Type Ia-CSM PTF11kx and SN 2020eyj. However, the later-time spectra of SN 2020aeuh lack hydrogen and helium narrow lines. Instead, a few narrow lines could be attributed to carbon and oxygen. We fit the pseudobolometric light curve with a CSM-interaction mode, yielding a CSM mass of 1-2 M$_{\odot}$. We propose that SN 2020aeuh was a Type Ia supernova that eventually interacted with a dense medium which was deficient in both hydrogen and helium. Whereas previous SNe Ia-CSM constitute our best evidence for nondegenerate companion progenitors, the CSM around SN 2020aeuh is more difficult to understand. We include a hydrodynamical simulation for a double-degenerate system to showcase how the dynamical evolution of such a progenitor scenario could produce the CSM observed around SN 2020aeuh. It is clear that SN 2020aeuh challenges current models for stellar evolution leading up to a SN Ia explosion.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_08532
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	A thermonuclear supernova interacting with hydrogen- and helium-deficient circumstellar material. SN 2020aeuh as a SN Ia-CSM-C/O? Tsalapatas, K. Sollerman, J. Chiba, R. Kool, E. Johansson, J. Rosswog, S. Schulze, S. Moriya, T. J. Andreoni, I. Brink, T. G. Chen, T. X. Covarrubias, S. De, K. Dimitriadis, G. Filippenko, A. V. Fremling, C. Gangopadhyay, A. Maguire, K. Mo, G. Sharma, Y. Sravan, N. Terwel, J. H. Yang, Y. High Energy Astrophysical Phenomena Identifying the progenitors of thermonuclear supernovae (Type Ia supernovae; SNe Ia) remains a key objective in contemporary astronomy. The rare subclass of SNe Ia that interacts with circumstellar material (Type Ia-CSM) allows for studies of the progenitor's environment before explosion, and generally favours single-degenerate progenitor channels. The case of SN Ia-CSM PTF11kx clearly connected thermonuclear explosions with hydrogen-rich CSM-interacting events, and the more recent SN 2020eyj connected SNe Ia with helum-rich companion progenitors. Here we present a study of SN 2020aeuh, a Type Ia-CSM with delayed interaction. We analyse photometric and spectroscopic data that monitor the evolution of SN 2020aeuh and compare its properties with those of peculiar SNe Ia and core-collapse SNe. At early times, the evolution of SN 2020aeuh resembles a slightly overluminous SN Ia. Later, the interaction-dominated spectra develop the same pseudocontinuum seen in Type Ia-CSM PTF11kx and SN 2020eyj. However, the later-time spectra of SN 2020aeuh lack hydrogen and helium narrow lines. Instead, a few narrow lines could be attributed to carbon and oxygen. We fit the pseudobolometric light curve with a CSM-interaction mode, yielding a CSM mass of 1-2 M$_{\odot}$. We propose that SN 2020aeuh was a Type Ia supernova that eventually interacted with a dense medium which was deficient in both hydrogen and helium. Whereas previous SNe Ia-CSM constitute our best evidence for nondegenerate companion progenitors, the CSM around SN 2020aeuh is more difficult to understand. We include a hydrodynamical simulation for a double-degenerate system to showcase how the dynamical evolution of such a progenitor scenario could produce the CSM observed around SN 2020aeuh. It is clear that SN 2020aeuh challenges current models for stellar evolution leading up to a SN Ia explosion.
title	A thermonuclear supernova interacting with hydrogen- and helium-deficient circumstellar material. SN 2020aeuh as a SN Ia-CSM-C/O?
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2507.08532