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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - SN 2023zaw
T2 - The Low-energy Explosion of an Ultrastripped Star
AU - Moore, T.
AU - Gillanders, J. H.
AU - Nicholl, M.
AU - Huber, M. E.
AU - Smartt, S. J.
AU - Srivastav, S.
AU - Stevance, H. F.
AU - Chen, T.-W.
AU - Chambers, K. C.
AU - Anderson, J. P.
AU - Fulton, M. D.
AU - Oates, S. R.
AU - Angus, C.
AU - Pignata, G.
AU - Erasmus, N.
AU - Gao, H.
AU - Herman, J.
AU - Lin, C.-C.
AU - Lowe, T.
AU - Magnier, E. A.
AU - Minguez, P.
AU - Ngeow, C.-C.
AU - Sheng, X.
AU - Sim, S. A.
AU - Smith, K. W.
AU - Wainscoat, R.
AU - Yang, S.
AU - Young, D. R.
AU - Zeng, K.-J.
PY - 2025/2/20
Y1 - 2025/2/20
N2 - Most stripped-envelope supernova progenitors are thought to be formed through binary interaction, losing hydrogen and/or helium from their outer layers. Ultrastripped supernovae are an emerging class of transient that are expected to be produced through envelope stripping by a neutron star companion. However, relatively few examples are known, and the outcomes of such systems can be diverse and are poorly understood at present. Here we present spectroscopic observations and high-cadence, multiband photometry of SN 2023zaw, a rapidly evolving supernova with a low ejecta mass. SN 2023zaw was discovered in a nearby spiral galaxy at D = 39.7 Mpc. It has significant Milky Way extinction, E(B − V)MW = 0.21, and significant (but uncertain) host extinction. Bayesian evidence comparison reveals that nickel is not the only power source and that an additional energy source is required to explain our observations. Our models suggest that an ejecta mass of Mej ∼ 0.07 M⊙ and a synthesised nickel mass of MNi ∼ 0.007 M⊙ are required to explain the observations. We find that additional heating from a central engine, or interaction with circumstellar material, can power the early light curve.
AB - Most stripped-envelope supernova progenitors are thought to be formed through binary interaction, losing hydrogen and/or helium from their outer layers. Ultrastripped supernovae are an emerging class of transient that are expected to be produced through envelope stripping by a neutron star companion. However, relatively few examples are known, and the outcomes of such systems can be diverse and are poorly understood at present. Here we present spectroscopic observations and high-cadence, multiband photometry of SN 2023zaw, a rapidly evolving supernova with a low ejecta mass. SN 2023zaw was discovered in a nearby spiral galaxy at D = 39.7 Mpc. It has significant Milky Way extinction, E(B − V)MW = 0.21, and significant (but uncertain) host extinction. Bayesian evidence comparison reveals that nickel is not the only power source and that an additional energy source is required to explain our observations. Our models suggest that an ejecta mass of Mej ∼ 0.07 M⊙ and a synthesised nickel mass of MNi ∼ 0.007 M⊙ are required to explain the observations. We find that additional heating from a central engine, or interaction with circumstellar material, can power the early light curve.
KW - Circumstellar matter
KW - Supernovae
KW - Core-collapse supernovae
KW - Transient sources
KW - Type Ib supernovae
U2 - 10.3847/2041-8213/adade6
DO - 10.3847/2041-8213/adade6
M3 - Journal article
VL - 980
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L44
ER -