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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 and Yan, L (2024) SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor. Astrophysical Journal Letters, 969 (1). ISSN 2041-8205
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SN 2023zaw An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor.pdf - Published Version Available under License Creative Commons Attribution. Download (4MB) | Preview |
Abstract
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 (<0.005 M ☉) stripped-envelope supernovae, which can be explored with deep and high-cadence transient surveys.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 04 Oct 2024 16:17 |
| Last Modified: | 04 Oct 2024 16:30 |
| DOI or ID number: | 10.3847/2041-8213/ad527a |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24408 |
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