[Alumnos] HOY 10:30 hs. Charla Invitada Dr. Alejandro Clocchiatti

[Secretaría de Ciencia y Técnica]

*Estimados,

Les recordamos que hoy tendremos *la siguiente Charla Invitada *a las 
1*0*:*3*0 hs. en el Salón Meridiano. Los esperamos 15 minutos antes de 
l*a**Charla*con café y galletitas.

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Secretaría de Ciencia y Técnica
FCAG*

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*Charla invitada: Dr. Alejandro Clocchiatti (Instituto de Astrofísica - 
Pontificia Universidad Católica de Chile)*

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Título: Supersoft X-ray Sources and Type Ia SNe


Resumen: Type Ia SNe are still our prime distance estimator for 
cosmologically relevant distances. Large scale surveys are planned to 
observe 1000s of them and build Hubble Diagrams with, essentially, no 
statistical noise. However, lack of knowledge of their progenitors and, 
hence, their systematic trends with redshift will cast doubts on 
essentially any result, since systematic effects do mimic cosmology.

Supersoft X-ray sources (SSSs) are a serious candidate SN Ia progenitor 
and, if the link between them is finally established, a long lasting and 
bothersome problem in astronomy will start to see a solution. However, 
there are still many misteries regarding SSSs, chiefly among them, why 
is it that we do not detect the highly ionized regions that are expected 
to exist around them.

The lact of detection of the ionized regions robs SSSs science of an 
important tool to study their physics and evolution and contributes to 
delay establishing (or rejecting) them as a true SN Ia progenitor. We 
will present observations obtained with Baade Telescope at Las Campanas 
observatory using IMACS, using a specially designed O[III] narrow band 
filter, in an attempt to detect the Stromgren spheres around a set of 
SSSs and Type Ia SN renmants in the LMC (to test the hypothesis that 
these ionized regions remain in a fosilized state for millenia after a 
SN explosion).

We complement the study with theoretical modeling of the radiative 
transfer around the SSSs to set constrains on the physical state and 
characteristics of the circumstellar regions.

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