[Alumnos] Charla "Supersoft X-ray Sources and Type Ia SNe"

[Secretaría Académica FCAG]

*Charla del Dr. Alejandro Clocchiatti* (Instituto de Astrofísica -
Pontificia Universidad Católica de Chile)
*Martes 17 de octubre a las 10:30 hs. - Salón Meridiano*
*Facultad de Ciencias Astronómicas y Geofísicas - UNLP*

*Titulo: Supersoft X-ray Sources and Type Ia SNe*

Abstract:

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.

-- 
Secretaría Académica
Facultad de Ciencias Astronómicas y Geofísicas
Universidad Nacional de La Plata
Teléfono: +54-221-423-6593 Int. 1110
mail:        academic en fcaglp.unlp.edu.ar
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