Massive stars exploding in a He-rich circumstellar medium: XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc, and 2024aej
| Title: | Massive stars exploding in a He-rich circumstellar medium: XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc, and 2024aej |
|---|---|
| Authors: | Wang, ZY; Pastorello, A; Cai, YZ; Fraser, M; Reguitti, A; Lin, WL; Tartaglia, L; Andrew Howell, D; Benetti, S; Cappellaro, E; Chen, ZH; Elias-Rosa, N; Farah, J; Fiore, A; Hiramatsu, D; Kankare, E; Li, ZT; Lundqvist, P; Mazzali, PA; Mccully, C; Mo, J; Moran, S; Newsome, M; Padilla Gonzalez, E; Pellegrino, C; Peng, ZH; Smartt, SJ; Srivastav, S; Stritzinger, MD; Terreran, G; Tomasella, L; Valerin, G; Wang, GJ; Wang, XF; De Boer, T; Chambers, KC; Gao, H; Guo, FZ; Gutiérrez, CP; Kangas, T; Karamehmetoglu, E; Li, GC; Lin, CC; Lowe, TB; Ma, XR; Magnier, EA; Minguez, P; Pei, SP; Reynolds, TM; Wainscoat, RJ; Wang, B; Williams, S; Wu, CY; Yan, SY; Zhang, JJ; Zhang, XH; Zhu, XJ |
| Publisher Information: | EDP Sciences |
| Publication Year: | 2025 |
| Collection: | Liverpool John Moores University: LJMU Research Online |
| Subject Terms: | QB Astronomy; QC Physics |
| Description: | 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. |
| Document Type: | article in journal/newspaper |
| File Description: | text |
| Language: | English |
| ISSN: | 0004-6361 |
| Relation: | https://researchonline.ljmu.ac.uk/id/eprint/27103/1/Massive%20stars%20exploding%20in%20a%20Herich%20circumstellar%20medium%20XI%20Diverse%20evolution.pdf; Wang, ZY ORCID logoorcid:0000-0002-3231-1167 , Pastorello, A ORCID logoorcid:0000-0002-7259-4624 , Cai, YZ ORCID logoorcid:0000-0002-7714-493X , Fraser, M ORCID logoorcid:0000-0003-2191-1674 , Reguitti, A ORCID logoorcid:0000-0003-4254-2724 , Lin, WL, Tartaglia, L, Andrew Howell, D, Benetti, S, Cappellaro, E, Chen, ZH, Elias-Rosa, N ORCID logoorcid:0000-0002-1381-9125 , Farah, J, Fiore, A ORCID logoorcid:0000-0002-0403-3331 , Hiramatsu, D, Kankare, E ORCID logoorcid:0000-0001-8257-3512 , Li, ZT, Lundqvist, P ORCID logoorcid:0000-0002-3664-8082 , Mazzali, PA ORCID logoorcid:0000-0001-6876-8284 , Mccully, C, Mo, J, Moran, S ORCID logoorcid:0000-0001-5221-0243 , Newsome, M, Padilla Gonzalez, E, Pellegrino, C, Peng, ZH ORCID logoorcid:0009-0000-7773-553X , Smartt, SJ, Srivastav, S, Stritzinger, MD ORCID logoorcid:0000-0002-5571-1833 , Terreran, G, Tomasella, L, Valerin, G, Wang, GJ, Wang, XF, De Boer, T ORCID logoorcid:0000-0001-5486-2747 , Chambers, KC ORCID logoorcid:0000-0001-6965-7789 , Gao, H ORCID logoorcid:0000-0003-1015-5367 , Guo, FZ ORCID logoorcid:0009-0001-0660-1902 , Gutiérrez, CP ORCID logoorcid:0000-0003-2375-2064 , Kangas, T ORCID logoorcid:0000-0002-5477-0217 , Karamehmetoglu, E ORCID logoorcid:0000-0001-6209-838X , Li, GC, Lin, CC, Lowe, TB ORCID logoorcid:0000-0002-9438-3617 , Ma, XR, Magnier, EA ORCID logoorcid:0000-0002-7965-2815 , Minguez, P ORCID logoorcid:0009-0003-8803-8643 , Pei, SP ORCID logoorcid:0000-0002-0851-8045 , Reynolds, TM ORCID logoorcid:0000-0002-1022-6463 , Wainscoat, RJ ORCID logoorcid:0000-0002-1341-0952 , Wang, B ORCID logoorcid:0000-0002-3231-1167 , Williams, S ORCID logoorcid:0000-0001-8178-0202 , Wu, CY ORCID logoorcid:0000-0002-2452-551X , Yan, SY, Zhang, JJ ORCID logoorcid:0000-0002-8296-2590 , Zhang, XH and Zhu, XJ ORCID logoorcid:0000-0001-7049-6468 (2025) Massive stars exploding in a He-rich circumstellar medium: XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc, and 2024aej. Astronomy and Astrophysics, 700. ISSN 0004-6361 |
| DOI: | 10.1051/0004-6361/202554768 |
| Availability: | https://researchonline.ljmu.ac.uk/id/eprint/27103/; https://researchonline.ljmu.ac.uk/id/eprint/27103/1/Massive%20stars%20exploding%20in%20a%20Herich%20circumstellar%20medium%20XI%20Diverse%20evolution.pdf; https://doi.org/10.1051/0004-6361/202554768 |
| Rights: | cc_by |
| Accession Number: | edsbas.153D04B |
| Database: | BASE |