SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor
| Title: | SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor |
|---|---|
| Authors: | Das, KK; Fremling, C; Kasliwal, MM; Schulze, S; Sollerman, J; Karambelkar, V; Rose, S; Anand, S; Andreoni, I; Aubert, M; Brennan, SJ; Cenko, SB; Coughlin, MW; O’Connor, B; De, K; Fuller, J; Graham, M; Hammerstein, E; Haynie, A; Hinds, KR; Kleiser, I; Kulkarni, SR; Lin, Z; Liu, C; Mahabal, AA; Martin, C; Miller, AA; Neill, JD; Perley, DA; Pessi, PJ; Prusinski, NZ; Purdum, J; Ravi, V; Rusholme, B; Wu, S; Wold, A; Yan, L |
| Publisher Information: | American Astronomical Society |
| Publication Year: | 2024 |
| Collection: | Liverpool John Moores University: LJMU Research Online |
| Subject Terms: | QB Astronomy; QC Physics |
| Description: | We present SN 2023zaw—a subluminous (M r = −16.7 mag) and rapidly evolving supernova (t 1/2,r = 4.9 days), with the lowest nickel mass (≈0.002 M ⊙) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He i and Ca near-infrared emission lines with velocities of ∼10,000−12,000 km s−1. The late-time spectra show prominent narrow He i emission lines at ∼1000 km s−1, indicative of interaction with He-rich circumstellar material. SN 2023zaw is located in the spiral arm of a star-forming galaxy. We perform radiation-hydrodynamical and analytical modeling of the lightcurve by fitting with a combination of shock-cooling emission and nickel decay. The progenitor has a best-fit envelope mass of ≈0.2 M ☉ and an envelope radius of ≈50 R ⊙. The extremely low nickel mass and low ejecta mass (≈0.5 M ⊙) suggest an ultrastripped SN, which originates from a mass-losing low-mass He-star (zero-age main-sequence mass < 10 M ⊙) in a close binary system. This is a channel to form double neutron star systems, whose merger is detectable with LIGO. SN 2023zaw underscores the existence of a previously undiscovered population of extremely low nickel mass ( |
| Document Type: | article in journal/newspaper |
| File Description: | text |
| Language: | English |
| ISSN: | 2041-8205 |
| Relation: | https://researchonline.ljmu.ac.uk/id/eprint/24408/1/SN%202023zaw%20An%20Ultrastripped,%20Nickel-poor%20Supernova%20from%20a%20Low-mass%20Progenitor.pdf; Das, KK, Fremling, C, Kasliwal, MM, Schulze, S, Sollerman, J, Karambelkar, V, Rose, S, Anand, S, Andreoni, I, Aubert, M, Brennan, SJ, Cenko, SB, Coughlin, MW, O’Connor, B, De, K, Fuller, J, Graham, M, Hammerstein, E, Haynie, A, Hinds, KR ORCID logoorcid:0000-0002-0129-806X , Kleiser, I, Kulkarni, SR, Lin, Z, Liu, C, Mahabal, AA, Martin, C, Miller, AA, Neill, JD, Perley, DA ORCID logoorcid:0000-0001-8472-1996 , Pessi, PJ, Prusinski, NZ, Purdum, J, Ravi, V, Rusholme, B, Wu, S, Wold, A and Yan, L (2024) SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor. Astrophysical Journal Letters, 969 (1). ISSN 2041-8205 |
| DOI: | 10.3847/2041-8213/ad527a |
| Availability: | https://researchonline.ljmu.ac.uk/id/eprint/24408/; https://doi.org/10.3847/2041-8213/ad527a |
| Rights: | cc_by |
| Accession Number: | edsbas.82FF64C6 |
| Database: | BASE |