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<p>A toda la comunidad:<br>
</p>
<p>Les recordamos que en el día de hoy, a las 14:00 hs. en el Salón
Meridiano, se llevará a cabo una charla a cargo del Dr.
Aleksandar Cikota del European Southern Observatory, Chile.</p>
<b>
<div class="moz-forward-container"> <b><b
style="font-weight:normal"
id="gmail-m_-6812595034874996437docs-internal-guid-63827ca9-7fff-0118-6738-753093e1a804">Quedan
todos cordialmente invitados.</b></b><span
style="font-weight:normal"></span><br>
<br>
<b><b style="font-weight:normal"
id="gmail-m_-6812595034874996437docs-internal-guid-63827ca9-7fff-0118-6738-753093e1a804">Atentamente,
<br>
<br>
Secyt-FCAG</b></b></div>
</b>
<div class="moz-forward-container"><br>
<br>
-------- Mensaje reenviado --------<br>
<br>
Estimadas/os colegas,<br>
<br>
la semana que viene estará de visita en La Plata el Dr.
Aleksandar Cikota del European Southern Observatory, Chile. El
día martes 31 de mayo dará una charla sobre su tema de
investigación, por lo cual los/as invitamos a asistir en modo
presencial. La misma tendrá lugar en el Salón Meridiano de la
FCAG, y se deberá mantener un aforodel 50%, y el uso de barbijo.
La charla será dada en inglés. Abajo encontrarán el título y
resumen.<br>
<br>
Les dejo además el contacto de Aleksandar
(<a class="moz-txt-link-abbreviated" href="mailto:aleksandar.cikota@eso.org">aleksandar.cikota@eso.org</a>) y de Natalia por cualquier duda o
consulta (<a class="moz-txt-link-abbreviated" href="mailto:natalialrossignoli@gmail.com">natalialrossignoli@gmail.com</a>). Quedan todos/as
invitados/as.<br>
<br>
<br>
Dr. Favio R. Faifer<br>
Director<br>
Instituto de Astrofísica de La Plata<br>
CONICET-UNLP<br>
<br>
--------------------------------------------------------------------<br>
<br>
Investigating Type Ia Supernovae with (spectro)polarimetry<br>
<br>
Abstract: Spectropolarimetry offers an independent method to the
study inter/circum-stellar dust properties (by observing the
continuum polarization) and the analysis of the three-dimensional
geometrical properties of unresolved sources (by observing the
intrinsic continuum polarization and line polarization).<br>
I will discuss the results from a statistical analysis of the Si
II line polarization measurements of a sample of ~35 SNe Ia, and
argue possible implications on the progenitor system. We reduced
and examined, in a systematic way, archival linear
spectropolarimetric data of a sample of 35 SNe Ia observed with
the VLT’s FORS1+2 between 2001 and 2015 at 127 epochs in total
(Cikota et al. 2019).<br>
We found a statistically significant linear relationship between
the polarization of the Si II 6355Å line before maximum brightness
and the Si II line velocity and suggest that this, along with the
Dm15–PSi II relationship, may be explained in the context of a
delayed-detonation model. In contrast, we compared our
observations to numerical predictions in the Dm15–vSi II plane and
found a dichotomy in the polarization properties between
Chandrasekhar and sub-Chandrasekhar mass explosions, which
supports the possibility of two distinct explosion mechanisms.<br>
Furthermore, we acquired imaging polarimetry of a statistical
sample of 68 SNe Ia in host galaxies of different morphological
types, and found that the source of the peculiar polarization
curves steeply rising towards blue wavelengths (and the peculiar
extinction curves with low Rv values) observed towards some
reddened SNe Ia is likely the result of interstellar material as
opposed to circumstellar material. Thus, the peculiar polarization
and extinction properties observed toward some SNe Ia may be
explained by the radiative torque disruption mechanism induced by
the SN or the interstellar radiation field (Chu et al. 2022).<br>
<br>
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