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.; Andrew Howell, D.; 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.; Padilla Gonzalez, E.; 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.; Gutierrez, 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.; Yan, S. -y.; Zhang, J-J; Zhang, X. -h.; Zhu, X. -J
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.
Andrew Howell, D.
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.
Padilla Gonzalez, E.
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.
Gutierrez, 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.
Yan, S. -y.
Zhang, J-J
Zhang, X. -h.
Zhu, X. -J
Katso/Avaa
Lataukset: 

EDP SCIENCES S A
doi:10.1051/0004-6361/202554768
URI
https://www.aanda.org/articles/aa/full_html/2025/08/aa54768-25/aa54768-25.html
Näytä kaikki kuvailutiedot
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe202601217330
Tiivistelmä
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 SN discovered to date, with an exceptionally low r-band absolute magnitude of -16.4 mag. The pseudo-bolometric light curves peak at (1 - 10)x10(42) erg s(-1), with total radiated energies on the order of (1 - 10)x10(48) erg. Spectroscopically, these SNe display a relatively slow spectral evolution. The early spectra are characterised by a hot blue continuum and prominent He I emission lines. The early spectra also show blackbody temperatures exceeding 10 000 K, with a subsequent decline in temperature during later phases. Narrow He I lines, which are indicative of unshocked circumstellar material (CSM), show velocities of approximately 1000 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. Our light curve modelling yielded estimates for the ejecta mass (M-ej) in the range 1 - 3 M-circle dot with kinetic energies (E-Kin) of (0.1 - 1)x10(50) erg. The inferred CSM mass ranges from 0.2 to 1 M-circle dot. These findings are consistent with expectations for core collapse events arising from relatively massive envelope-stripped progenitors.
Kokoelmat