[Graduados] Miércoles 6/11 - 12:00h - Seminario FCAG "Core-collapse supernovae and their parent stellar populations" - Dr. Joseph Anderson (European Southern Observatory)

[Secretaría de Ciencia y Técnica]

Buenas tardes,

les informamos que *el próximo miércoles 6 de noviembre a las 12h*, se 
brindará el Seminario FCAG *"Core-collapse supernovae and their parent 
stellar populations"*, en el Salón Meridiano. El mismo estará a cargo 
del Dr. Joseph Anderson (European Southern Observatory). A continuación, 
les dejamos el resumen y los datos de conexión para aquellos que no 
puedan acercarse al Salón Meridiano.

*Resumen:*Core-collapse supernovae (CCSNe) are the explosive deaths of 
massive (>8-10Msun) stars. A large diversity is seen in the observed
light curves and spectra of CCSNe, which arises from the final chemical 
composition and density profile of the pre-SN progenitor star before 
explosion. This final state depends on the initial conditions of the 
system - mass, metallicity, and binarity, determining the stellar 
evolutionary pathway through which the progenitor evolves and loses 
mass. Constraints on initial progenitor properties can be obtained 
through observing the host environment where different SN types are 
discovered. This requires assumptions on the properties of the star 
formation within host galaxies/environments, such as the IMF, the star 
formation efficiency, and the effects of feedback. One can also invert 
this line of reasoning: assume properties of CCSN progenitors and use 
their frequency within different galaxies/environments to constrain the 
star formation therein. In this seminar, I will first summarise the 
historical literature that we have published using observations of the 
parent stellar populations to constrain CCSN progenitors; specifically 
differences in mass and metallicity between SN types II and 
'stripped-envelope'. I will show how these same data have been used to 
argue for top-heavy IMFs in the central regions of interacting galaxies 
from the radial distribution of CCSNe. I will then introduce the AMUSING 
survey: a dataset of >700 SN host galaxies observed with the MUSE  
integral field unit spectrograph at the VLT. The use of MUSE affords an 
analysis of both the host-HII regions of SN progenitors between 
different SN types, but also a comparison of the distribution of CCSN 
HII region properties (~100) with all other such HII regions (~7000) 
within the full sample. This has produced the surprising result that 
CCSNe appear to explode much more frequently in star-forming regions of 
lower metallicity - per unit star formation - than the general HII 
region population. I will present several possibilities to explain this 
result - all of which (if valid) would have a profound impact on our 
understanding of the explosion of massive stars and/or massive star 
formation.
Finally, as Head of the Office for Science of ESO in Chile, I will 
present a few slides on ESO's current and future facilities, and the 
opportunities for collaboration at the ESO-Chile campus in Vitacura, 
Santiago.

*

Datos de conexión:

Unirse a la reunión zoom:https://us02web.zoom.us/j/89642687970 
<https://us02web.zoom.us/j/89642687970>

ID de reunión: 896 4268 7970

Código de acceso: 526656

A fin de reducir el uso de residuos plásticos, les solicitamos que se 
acerquen con sus propias tazas para el café. Aunque este seminario será 
en formato híbrido, esperamos contar con su presencia.

Saludos,

SeCyT-FCAG

*--

Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs
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