[Doctorandos] Martes de Journal presencial

[Journal Club]

Hola!

El próximo martes (o sea, mañana) tendremos una reunión de Journal
especial, ya que vamos a juntarnos de manera presencial. Esto se debe a que
vamos a participar de la charla del Dr. Aleksandar Cikota, quien nos visita
desde el European Southern Observatory, Chile. El Dr. Cikota trabaja en
evolución estelar de estrellas de distinta masa.
Les dejamos el título y resumen (abstract) de su charla:

Título / Title:
Investigating Type Ia Supernovae with (spectro)polarimetry

Resumen / 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). 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).
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.
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).

La charla se va a dar en el marco del protocolo, es decir, el uso del
barbijo va a ser *obligatorio*.
Más allá de eso, es una buena oportunidad para reencontrarnos
presencialmente! Y no duden de venir sólo porque la charla es en inglés:
recuerden que la mayoría de les investigadores no hablan el inglés como
idioma nativo, así que todes estamos en la misma =).

Les esperamos en el *Salón Meridiano mañana martes 31/05 a las 14hs*!

Saludos!
El Journal

*===========================================================*


*El Journal cuenta con un slack, el cual es clave para informar sobre
reuniones, becas, congresos, recursos, papers, memes, etc. Si querés *
*sumarte, escribinos a journalclubfcaglp en gmail.com
<journalclubfcaglp en gmail.com>.*


*Si querés usar el espacio del Journal para contarnos sobre el trabajo que *

*estás haciendo (o alguno que te interese), o aprovechar a practicar alguna
*
*charlita, escribinos y coordinamos alguna de las reuniones!*

*Seguinos en nuestro Instagram: journal_club_fcaglp
<https://www.instagram.com/journal_club_fcaglp/>*
*===========================================================*
------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <http://fcaglp.fcaglp.unlp.edu.ar/pipermail/doctorandos/attachments/20220530/48da8ac1/attachment.html>