Watching a Star Explode with the Young Supernova Experiment

Event Date:
2022-02-07T15:00:00
2022-02-07T16:00:00
Event Location:
Connect via zoom
Speaker:
Wynn Jacobson-Galan (UC Berkeley)
URL:
Zoom link
Related Upcoming Events:
Astronomy Colloquia
Intended Audience:
Undergraduate
Local Contact:

Douglas Scott

Event Information:

We present multi-wavelength observations of supernova (SN) 2020tlf, the first normal type II-P/L SN with confirmed precursor emission, as detected by the Young Supernova Experiment (YSE) transient survey. Soon after discovery, "flash" spectroscopy of SN 2020tlf with Keck LRIS revealed prominent narrow emission lines from shock-ionized circumstellar material (CSM) shedded in progenitor mass-loss episodes in the final months before explosion. Following classification, SN 2020tlf was observed in a thorough multi-wavelength follow-up campaign (x-ray to radio) out to 300 days after explosion. The nebular phase spectra of SN 2020tlf constrain the possible progenitor masses to 10-12 Msun. Finally, we present radiative transfer modeling of the SN light curve and spectral evolution, which reveals that the progenitor star had an extended envelope, detached CSM and a heightened mass-loss rate. We will discuss how the progenitor and CSM properties of SN 2020tlf fit within the phase space of the small but growing number of SNe with "flash" spectroscopy and pre-explosion eruptions.

Add to Calendar 2022-02-07T15:00:00 2022-02-07T16:00:00 Watching a Star Explode with the Young Supernova Experiment Event Information: We present multi-wavelength observations of supernova (SN) 2020tlf, the first normal type II-P/L SN with confirmed precursor emission, as detected by the Young Supernova Experiment (YSE) transient survey. Soon after discovery, "flash" spectroscopy of SN 2020tlf with Keck LRIS revealed prominent narrow emission lines from shock-ionized circumstellar material (CSM) shedded in progenitor mass-loss episodes in the final months before explosion. Following classification, SN 2020tlf was observed in a thorough multi-wavelength follow-up campaign (x-ray to radio) out to 300 days after explosion. The nebular phase spectra of SN 2020tlf constrain the possible progenitor masses to 10-12 Msun. Finally, we present radiative transfer modeling of the SN light curve and spectral evolution, which reveals that the progenitor star had an extended envelope, detached CSM and a heightened mass-loss rate. We will discuss how the progenitor and CSM properties of SN 2020tlf fit within the phase space of the small but growing number of SNe with "flash" spectroscopy and pre-explosion eruptions. Event Location: Connect via zoom