<div dir="ltr"><div>Hola!</div><div><br></div><div>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.</div><div>Les dejamos el título y resumen (abstract) de su charla:<br></div><div><br></div><div>Título / Title: <br></div><div>Investigating Type Ia Supernovae with (spectro)polarimetry<br></div><div><br></div><div>Resumen / Abstract: <br></div>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).<div><br></div><div>La charla se va a dar en el marco del protocolo, es decir, el uso del barbijo va a ser <u>obligatorio</u>. <br></div><div>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 =).</div><div><br></div><div>Les esperamos en el <b>Salón Meridiano mañana martes 31/05 a las 14hs</b>!<br></div><div><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none"><br></span></span></span></div><div>Saludos!</div><div>El Journal</div><div><br></div><div><div><span style="font-family:arial narrow,sans-serif"><i>===========================================================</i></span></div><div><span style="font-family:arial narrow,sans-serif"><i>El Journal cuenta con un slack, el cual es clave para informar sobre <br>reuniones, becas, congresos, recursos,
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