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The nearby He-rich superluminous supernova SN 2021bnw at photospheric phases

Fuente: arXiv

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Auteurs principaux:	Fiore, A., Kozyreva, A., Yan, L., Benetti, S., Anderson, J. P., Baklanov, P., Cai, Y. -Z., Cappellaro, E., Chen, T. -W., Elias-Rosa, N., Gal-Yam, A., Graham, M. J., Gromadzki, M., Groom, S. L., Gutiérrez, C. P., Hiramatsu, D., Howell, D. A., Inserra, C., Kasliwal, M. M., Könyves-Tóth, R., Lundqvist, P., McCully, C., Mironov, A., Moran, S., Müller-Bravo, T. E., Newsome, M., Nicholl, M., Ochner, P., Gonzalez, E. Padilla, Pessi, P. J., Pignata, G., Ragosta, F., Reguitti, A., Reynolds, T. M., Riddle, R. L., Rusholme, B., Salmaso, I., Schulze, S., Sollerman, J., Tomasella, L., Warshofsky, D., Yang, S., Young, D. R.
Format:	Preprint
Publié:	2026
Sujets:	High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
Accès en ligne:	Acceder al recurso
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_version_	1866913050138771456
author	Fiore, A. Kozyreva, A. Yan, L. Benetti, S. Anderson, J. P. Baklanov, P. Cai, Y. -Z. Cappellaro, E. Chen, T. -W. Elias-Rosa, N. Gal-Yam, A. Graham, M. J. Gromadzki, M. Groom, S. L. Gutiérrez, C. P. Hiramatsu, D. Howell, D. A. Inserra, C. Kasliwal, M. M. Könyves-Tóth, R. Lundqvist, P. McCully, C. Mironov, A. Moran, S. Müller-Bravo, T. E. Newsome, M. Nicholl, M. Ochner, P. Gonzalez, E. Padilla Pessi, P. J. Pignata, G. Ragosta, F. Reguitti, A. Reynolds, T. M. Riddle, R. L. Rusholme, B. Salmaso, I. Schulze, S. Sollerman, J. Tomasella, L. Warshofsky, D. Yang, S. Young, D. R.
author_facet	Fiore, A. Kozyreva, A. Yan, L. Benetti, S. Anderson, J. P. Baklanov, P. Cai, Y. -Z. Cappellaro, E. Chen, T. -W. Elias-Rosa, N. Gal-Yam, A. Graham, M. J. Gromadzki, M. Groom, S. L. Gutiérrez, C. P. Hiramatsu, D. Howell, D. A. Inserra, C. Kasliwal, M. M. Könyves-Tóth, R. Lundqvist, P. McCully, C. Mironov, A. Moran, S. Müller-Bravo, T. E. Newsome, M. Nicholl, M. Ochner, P. Gonzalez, E. Padilla Pessi, P. J. Pignata, G. Ragosta, F. Reguitti, A. Reynolds, T. M. Riddle, R. L. Rusholme, B. Salmaso, I. Schulze, S. Sollerman, J. Tomasella, L. Warshofsky, D. Yang, S. Young, D. R.
contents	Aim. We present and interpret the data of the nearby hydrogen-deficient but helium-rich superluminous supernova SN~2021bnw which reached a magnitude of -20.7 at maximum luminosity in g band. Methods. We discuss the light curves and spectra of SN 2021bnw based on its spectro-photometric follow up exploiting different observational facilities. We reproduce the NIR spectrum of SN 2021bnw with TARDIS to inspect the chemical composition at late photospheric phases and identify helium features. We also use a STELLA model coupling hydrodynamics and radiation transport to constrain the physical parameters of the explosion assmunig a 56Ni+CSM scenario. Results. We suggest that SN 2021bnw was mainly powered by the interaction of the ejecta with a previously lost He-rich circumstellar material, coupled with a central power source. Conclusions. This work expands the data sample of He-rich superluminous supernovae rich (SLSNe Ib) and, assuming a single progenitor scenario, can constrain the masses and the physics of their progenitors.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_12948
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	The nearby He-rich superluminous supernova SN 2021bnw at photospheric phases Fiore, A. Kozyreva, A. Yan, L. Benetti, S. Anderson, J. P. Baklanov, P. Cai, Y. -Z. Cappellaro, E. Chen, T. -W. Elias-Rosa, N. Gal-Yam, A. Graham, M. J. Gromadzki, M. Groom, S. L. Gutiérrez, C. P. Hiramatsu, D. Howell, D. A. Inserra, C. Kasliwal, M. M. Könyves-Tóth, R. Lundqvist, P. McCully, C. Mironov, A. Moran, S. Müller-Bravo, T. E. Newsome, M. Nicholl, M. Ochner, P. Gonzalez, E. Padilla Pessi, P. J. Pignata, G. Ragosta, F. Reguitti, A. Reynolds, T. M. Riddle, R. L. Rusholme, B. Salmaso, I. Schulze, S. Sollerman, J. Tomasella, L. Warshofsky, D. Yang, S. Young, D. R. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Aim. We present and interpret the data of the nearby hydrogen-deficient but helium-rich superluminous supernova SN~2021bnw which reached a magnitude of -20.7 at maximum luminosity in g band. Methods. We discuss the light curves and spectra of SN 2021bnw based on its spectro-photometric follow up exploiting different observational facilities. We reproduce the NIR spectrum of SN 2021bnw with TARDIS to inspect the chemical composition at late photospheric phases and identify helium features. We also use a STELLA model coupling hydrodynamics and radiation transport to constrain the physical parameters of the explosion assmunig a 56Ni+CSM scenario. Results. We suggest that SN 2021bnw was mainly powered by the interaction of the ejecta with a previously lost He-rich circumstellar material, coupled with a central power source. Conclusions. This work expands the data sample of He-rich superluminous supernovae rich (SLSNe Ib) and, assuming a single progenitor scenario, can constrain the masses and the physics of their progenitors.
title	The nearby He-rich superluminous supernova SN 2021bnw at photospheric phases
topic	High Energy Astrophysical Phenomena Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2602.12948