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Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej

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Auteurs principaux:	Wang, Z. -Y., Pastorello, A., Cai, Y. -Z., Fraser, M., Reguitti, A., Lin, W. -L., Tartaglia, L., Howell, D. Andrew, Benetti, S., Cappellaro, E., Chen, Z. -H., Elias-Rosa, N., Farah, J., Fiore, A., Hiramatsu, D., Kankare, E., Li, Z. -T., Lundqvist, P., Mazzali, P. A., McCully, C., Mo, J., Moran, S., Newsome, M., Gonzalez, E. Padilla, Pellegrino, C., Peng, Z. -H., Smartt, S. J., Srivastav, S., Stritzinger, M. D., Terreran, G., Tomasella, L., Valerin, G., Wang, G. -J., Wang, X. -F., de Boer, T., Chambers, K. C., Gao, H., Guo, F. -Z., Guti'errez, C. P., Kangas, T., Karamehmetoglu, E., Li, G. -C., Lin, C. -C., Lowe, T. B., Ma, X. -R., Magnier, E. A., Minguez, P., Pei, S. -P., Reynolds, T. M., Wainscoat, R. J., Wang, B., Williams, S., Wu, C. -Y., Zhang, J. -J., Zhang, X. -H., Zhu, X. -J.
Format:	Preprint
Publié:	2025
Sujets:	High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
Accès en ligne:	Acceder al recurso
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_version_	1866918130794627072
author	Wang, Z. -Y. Pastorello, A. Cai, Y. -Z. Fraser, M. Reguitti, A. Lin, W. -L. Tartaglia, L. Howell, D. Andrew Benetti, S. Cappellaro, E. Chen, Z. -H. Elias-Rosa, N. Farah, J. Fiore, A. Hiramatsu, D. Kankare, E. Li, Z. -T. Lundqvist, P. Mazzali, P. A. McCully, C. Mo, J. Moran, S. Newsome, M. Gonzalez, E. Padilla Pellegrino, C. Peng, Z. -H. Smartt, S. J. Srivastav, S. Stritzinger, M. D. Terreran, G. Tomasella, L. Valerin, G. Wang, G. -J. Wang, X. -F. de Boer, T. Chambers, K. C. Gao, H. Guo, F. -Z. Guti'errez, C. P. Kangas, T. Karamehmetoglu, E. Li, G. -C. Lin, C. -C. Lowe, T. B. Ma, X. -R. Magnier, E. A. Minguez, P. Pei, S. -P. Reynolds, T. M. Wainscoat, R. J. Wang, B. Williams, S. Wu, C. -Y. Zhang, J. -J. Zhang, X. -H. Zhu, X. -J.
author_facet	Wang, Z. -Y. Pastorello, A. Cai, Y. -Z. Fraser, M. Reguitti, A. Lin, W. -L. Tartaglia, L. Howell, D. Andrew Benetti, S. Cappellaro, E. Chen, Z. -H. Elias-Rosa, N. Farah, J. Fiore, A. Hiramatsu, D. Kankare, E. Li, Z. -T. Lundqvist, P. Mazzali, P. A. McCully, C. Mo, J. Moran, S. Newsome, M. Gonzalez, E. Padilla Pellegrino, C. Peng, Z. -H. Smartt, S. J. Srivastav, S. Stritzinger, M. D. Terreran, G. Tomasella, L. Valerin, G. Wang, G. -J. Wang, X. -F. de Boer, T. Chambers, K. C. Gao, H. Guo, F. -Z. Guti'errez, C. P. Kangas, T. Karamehmetoglu, E. Li, G. -C. Lin, C. -C. Lowe, T. B. Ma, X. -R. Magnier, E. A. Minguez, P. Pei, S. -P. Reynolds, T. M. Wainscoat, R. J. Wang, B. Williams, S. Wu, C. -Y. Zhang, J. -J. Zhang, X. -H. Zhu, X. -J.
contents	We present the photometric and spectroscopic analysis of five Type Ibn supernovae (SNe): SN 2020nxt, SN 2020taz, SN 2021bbv, SN 2023utc, and SN 2024aej. These events share key observational features and belong to a family of objects similar to the prototypical Type Ibn SN 2006jc. The SNe exhibit rise times of approximately 10 days and peak absolute magnitudes ranging from $-$16.5 to $-$19 mag. Notably, SN 2023utc is the faintest Type Ibn supernova discovered to date, with an exceptionally low r-band absolute magnitude of $-16.4$ mag. The pseudo-bolometric light curves peak at $(1-10) \times 10^{42}$ erg s$^{-1}$, with total radiated energies on the order of $(1-10) \times 10^{48}$ erg. Spectroscopically, these SNe display relatively slow spectral evolution; the early spectra are characterised by a hot blue continuum and prominent He I emission lines. Early spectra show blackbody temperatures exceeding $10000~\mathrm{K}$, with a subsequent decline in temperature during later phases. Narrow He I lines, indicative of unshocked circumstellar material (CSM), show velocities of approximately $1000~\mathrm{km~s^{-1}}$. The spectra suggest that the progenitors of these SNe underwent significant mass loss prior to the explosion, resulting in a He-rich CSM. Light curve modelling yields estimates for the ejecta mass ($M_{\rm ej}$) in the range $1-3~M_{\odot}$, with kinetic energies ($E_{\rm Kin}$) of $(0.1-1) \times 10^{50}$ erg. The inferred CSM mass ranges from $0.2$ to $1~M_{\odot}$. These findings are consistent with expectations for core-collapse events arising from relatively massive, envelope-stripped progenitors.
format	Preprint
id	arxiv_https___arxiv_org_abs_2506_15139
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej Wang, Z. -Y. Pastorello, A. Cai, Y. -Z. Fraser, M. Reguitti, A. Lin, W. -L. Tartaglia, L. Howell, D. Andrew Benetti, S. Cappellaro, E. Chen, Z. -H. Elias-Rosa, N. Farah, J. Fiore, A. Hiramatsu, D. Kankare, E. Li, Z. -T. Lundqvist, P. Mazzali, P. A. McCully, C. Mo, J. Moran, S. Newsome, M. Gonzalez, E. Padilla Pellegrino, C. Peng, Z. -H. Smartt, S. J. Srivastav, S. Stritzinger, M. D. Terreran, G. Tomasella, L. Valerin, G. Wang, G. -J. Wang, X. -F. de Boer, T. Chambers, K. C. Gao, H. Guo, F. -Z. Guti'errez, C. P. Kangas, T. Karamehmetoglu, E. Li, G. -C. Lin, C. -C. Lowe, T. B. Ma, X. -R. Magnier, E. A. Minguez, P. Pei, S. -P. Reynolds, T. M. Wainscoat, R. J. Wang, B. Williams, S. Wu, C. -Y. Zhang, J. -J. Zhang, X. -H. Zhu, X. -J. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present the photometric and spectroscopic analysis of five Type Ibn supernovae (SNe): SN 2020nxt, SN 2020taz, SN 2021bbv, SN 2023utc, and SN 2024aej. These events share key observational features and belong to a family of objects similar to the prototypical Type Ibn SN 2006jc. The SNe exhibit rise times of approximately 10 days and peak absolute magnitudes ranging from $-$16.5 to $-$19 mag. Notably, SN 2023utc is the faintest Type Ibn supernova discovered to date, with an exceptionally low r-band absolute magnitude of $-16.4$ mag. The pseudo-bolometric light curves peak at $(1-10) \times 10^{42}$ erg s$^{-1}$, with total radiated energies on the order of $(1-10) \times 10^{48}$ erg. Spectroscopically, these SNe display relatively slow spectral evolution; the early spectra are characterised by a hot blue continuum and prominent He I emission lines. Early spectra show blackbody temperatures exceeding $10000~\mathrm{K}$, with a subsequent decline in temperature during later phases. Narrow He I lines, indicative of unshocked circumstellar material (CSM), show velocities of approximately $1000~\mathrm{km~s^{-1}}$. The spectra suggest that the progenitors of these SNe underwent significant mass loss prior to the explosion, resulting in a He-rich CSM. Light curve modelling yields estimates for the ejecta mass ($M_{\rm ej}$) in the range $1-3~M_{\odot}$, with kinetic energies ($E_{\rm Kin}$) of $(0.1-1) \times 10^{50}$ erg. The inferred CSM mass ranges from $0.2$ to $1~M_{\odot}$. These findings are consistent with expectations for core-collapse events arising from relatively massive, envelope-stripped progenitors.
title	Massive stars exploding in a He-rich circumstellar medium. XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc and 2024aej
topic	High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2506.15139