SIMBAD references

2025A&A...700A.156W - Astronomy and Astrophysics, volume 700A156 (2025/8-1)

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.A., 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. and ZHU X.-J.

Abstract (from CDS):

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)×1042 erg s–1, with total radiated energies on the order of (1 - 10)×1048 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 (Mej) in the range 1 - 3 M⊙ with kinetic energies (EKin) of (0.1 - 1)×1050 erg. The inferred CSM mass ranges from 0.2 to 1 M⊙. These findings are consistent with expectations for core collapse events arising from relatively massive envelope-stripped progenitors.

Abstract Copyright: © The Authors 2025

Journal keyword(s): circumstellar matter - supernovae: individual: SN 2020nxt - supernovae: individual: SN 2020taz - supernovae: individual: SN 2021bbv - supernovae: individual: SN 2023utc - supernovae: individual: SN 2024aej

VizieR on-line data: <Available at CDS (J/A+A/700/A156): table1.dat 2020nxt.dat 2020taz.dat 2021bbv.dat 2023utc.dat 2024aej.dat>

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 43

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