Ejecta masses in Type Ia Supernovae -- Implications for the Progenitor and the Explosion Scenario

Zsófia Bora, Réka Könyves-Tóth, József Vinkó, Dominik Bánhidi, Imre Barna Bíró, K. Azalee Bostroem, Attila Bódi, Jamison Burke, István Csányi, Borbála Cseh, Joseph Farah, Alexei V. Filippenko, Tibor Hegedűs, Daichi Hiramatsu, Ágoston Horti-Dávid, D. Andrew Howell, Saurabh W. Jha, Csilla Kalup, Máté Krezinger, Levente Kriskovics, Curtis McCully, Megan Newsome, András Ordasi, Estefania Padilla Gonzalez, András Pál, Craig Pellegrino, Bálint Seli, Ádám Sódor, Zsófia Marianna Szabó, Olivér Norton Szabó, Róbert Szakáts, Tamás Szalai, Péter Székely, Giacomo Terreran, Vázsony Varga, Krisztián Vida, Xiaofeng Wang, J. Craig Wheeler

Published 2024-08-21Version 1

The progenitor system(s) as well as the explosion mechanism(s) of thermonuclear (Type Ia) supernovae are long-standing issues in astrophysics. Here we present ejecta masses and other physical parameters for 28 recent Type Ia supernovae inferred from multiband photometric and optical spectroscopic data. Our results confirm that the majority of SNe Ia show {\it observable} ejecta masses below the Chandrasekhar-limit (having a mean $M_{\rm ej} \approx 1.1 \pm 0.3$ M$_\odot$), consistent with the predictions of recent sub-M$_{\rm Ch}$ explosion models. They are compatible with models assuming either single- or double-degenerate progenitor configurations. We also recover a sub-sample of supernovae within $1.2 $ M$_\odot$ $< M_{\rm {ej}} < 1.5$ M$_\odot$ that are consistent with near-Chandrasekhar explosions. Taking into account the uncertainties of the inferred ejecta masses, about half of our SNe are compatible with both explosion models. We compare our results with those in previous studies, and discuss the caveats and concerns regarding the applied methodology.