Professor Stephen Smartt CBE FRS MRIA: Publications

Modelling the spectra of the kilonova AT2017gfo -- II: Beyond the photospheric epochs

(2023)

Authors:

JH Gillanders, SA Sim, SJ Smartt, S Goriely, A Bauswein

SN 2023emq: a flash-ionised Ibn supernova with possible CIII emissio

(2023)

Authors:

M Pursiainen, G Leloudas, S Schulze, P Charalampopoulos, CR Angus, JP Anderson, F Bauer, T-W Chen, L Galbany, M Gromadzki, CP Gutiérrez, C Inserra, J Lyman, TE Müller-Bravo, M Nicholl, SJ Smartt, L Tartaglia, P Wiseman, DR Young

SN 2023ixf in Messier 101: Photo-ionization of Dense, Close-in Circumstellar Material in a Nearby Type II Supernova

(2023)

Authors:

WV Jacobson-Galan, L Dessart, R Margutti, R Chornock, RJ Foley, CD Kilpatrick, DO Jones, K Taggart, CR Angus, S Bhattacharjee, LA Braff, D Brethauer, AJ Burgasser, F Cao, CM Carlile, KC Chambers, DA Coulter, E Dominguez-Ruiz, CB Dickinson, T de Boer, A Gagliano, C Gall, H Gao, EL Gates, S Gomez, M Guolo, MRJ Halford, J Hjorth, ME Huber, MN Johnson, PR Karpoor, T Laskar, N LeBaron, Z Li, Y Lin, SD Loch, PD Lynam, EA Magnier, P Maloney, DJ Matthews, M McDonald, H-Y Miao, D Milisavljevic, Y-C Pan, S Pradyumna, CL Ransome, JM Rees, A Rest, C Rojas-Bravo, NR Sandford, L Sandoval Ascencio, S Sanjaripour, A Savino, H Sears, N Sharei, SJ Smartt, ER Softich, CA Theissen, S Tinyanont, H Tohfa, VA Villar, Q Wang, RJ Wainscoat, AL Westerling, E Wiston, MA Wozniak, SK Yadavalli, Y Zenati

SN2023ixf in Messier 101: A Variable Red Supergiant as the Progenitor Candidate to a Type II Supernova

(2023)

Authors:

Charles D Kilpatrick, Ryan J Foley, Wynn V Jacobson-Galán, Anthony L Piro, Stephen J Smartt, Maria R Drout, Alexander Gagliano, Christa Gall, Jens Hjorth, David O Jones, Kaisey S Mandel, Raffaella Margutti, Conor L Ransome, V Ashley Villar, David A Coulter, Hua Gao, David Jacob Matthews, Yossef Zenati

Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations

Astronomy & Astrophysics EDP Sciences 675 (2023) A201-A201

Authors:

I Agudo, L Amati, T An, FE Bauer, S Benetti, MG Bernardini, R Beswick, K Bhirombhakdi, T de Boer, M Branchesi, SJ Brennan, E Brocato, MD Caballero-García, E Cappellaro, N Castro Rodríguez, AJ Castro-Tirado, KC Chambers, E Chassande-Mottin, S Chaty, T-W Chen, A Coleiro, S Covino, F D’Ammando, P D’Avanzo, V D’Elia, A Fiore, A Flörs, M Fraser, S Frey, C Frohmaier, M Fulton, L Galbany, C Gall, H Gao, J García-Rojas, G Ghirlanda, S Giarratana, JH Gillanders, M Giroletti, BP Gompertz, M Gromadzki, KE Heintz, J Hjorth, Y-D Hu, ME Huber, A Inkenhaag, L Izzo, ZP Jin, PG Jonker, DA Kann

Abstract:

Most stripped envelope supernova progenitors are formed through binary interaction, losing hydrogen and/or helium from their outer layers. An emerging class of supernovae with the highest degree of envelope-stripping are thought to be the product of stripping by a NS 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 multi-band photometry of SN 2023zaw, a low ejecta mass and rapidly evolving supernova. SN 2023zaw was discovered in a nearby spiral galaxy at D = 39.7 Mpc, with significant Milky Way extinction, $E(B-V) = 0.21$, and significant (but uncertain) host extinction. Bayesian evidence comparison reveals that nickel is not the only power source and an additional energy source is required to explain our observations. Our models suggest an ejecta mass of $M_{\rm ej} \sim 0.07\,\rm M_\odot$ and a synthesised nickel mass of $M_{\rm ej} \sim 0.007\,\rm M_\odot$ is required to explain the explosion. However an additional heating from a magnetar or interaction with circumstellar material is required to power the early light curve

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