Artur Hakobyan
Yerevan Phys. Inst. (Yerevan, Arménie)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « Constraining type Ia supernova progenitors within host galaxy discs » |
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Artur Hakobyan |
| Over the past decade, compelling evidence has emerged that supports the existence of multiple progenitor channels leading to Type Ia supernovae (SNe Ia). In this seminar, I will provide a brief overview of our current understanding of SNe Ia progenitor natures and explosion mechanisms. Among the different channels, SNe Ia originating from sub-Chandrasekhar mass carbon-oxygen white dwarfs (WDs) have garnered significant attention. In these systems, an initial helium shell detonation - fed by material accreted from a binary companion - triggers a secondary detonation in the core of the primary WD. This double-detonation scenario predicts a critical relationship between the progenitor system's age and the peak luminosity of SN: younger progenitors result in brighter SNe. I will present our latest findings that validate the predicted correlation. Our analysis focuses on the spatial distribution of nearby SNe Ia within their host galaxy discs, employing diverse methods to estimate progenitor (dynamical) ages. These methods include analysing the relationship between SNe photometric properties, such as light curve decline rates, and their vertical distributions in discs, as well as their distances from host spiral arms. Additionally, I will present our results on the characteristics of SNe Ia host populations in the context of the "star formation desert" phenomenon and beyond. Finally, I will detail the questions still open and provide some perspectives on future research, as the ongoing robotic telescope surveys and the forthcoming Vera C. Rubin Observatory promise to deliver a far larger spectroscopic and photometric sample of nearby SNe Ia, enabling more robust and precise analyses. |
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vendredi 22 novembre 2024 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |