{"id":18543,"date":"2018-11-08T08:57:22","date_gmt":"2018-11-08T11:57:22","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=18543"},"modified":"2023-08-04T21:30:42","modified_gmt":"2023-08-04T21:30:42","slug":"nuestra-investigacion-hypernova","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/nuestra-investigacion-hypernova\/","title":{"rendered":"Nuestra Investigaci\u00f3n: Explosi\u00f3n de Hypernova a 14% de la velocidad de la luz"},"content":{"rendered":"<h4><em><strong>Por Felipe Olivares,\u00a0investigador postdoctoral MAS<\/strong><\/em><\/h4>\n<p><!--more--><\/p>\n<p><strong>Existe un tipo de supernova (SN) energ\u00e9tica que es precedida por una\u00a0explosi\u00f3n de rayos gamma (GRB, por sus siglas en ingl\u00e9s). Ambos\u00a0fen\u00f3menos son producidos por el colapso gravitatorio de una estrella\u00a0masiva.<\/strong> La emisi\u00f3n en rayos gamma dura s\u00f3lo algunos segundos y se\u00a0encuentra colimada producto del jet relativista en donde se\u00a0origina. Entonces s\u00f3lo somos capaces de detectar esta emisi\u00f3n desde el\u00a0espacio si es que el jet nos est\u00e1 apuntando (ver la foto de portada\u00a0para una representaci\u00f3n art\u00edstica de una detecci\u00f3n del sat\u00e9lite Swift;\u00a0<strong>Al analizar la emisi\u00f3n en rayos X que sigue al GRB,\u00a0somos capaces de localizar la posici\u00f3n exacta en el cielo donde, luego\u00a0de unos d\u00edas, aparecer\u00e1 la luz de la SN. Estas supernovas son llamadas\u00a0\u00abhypernovas\u00bb debido a su gran luminosidad y r\u00e1pida expansi\u00f3n.<\/strong><\/p>\n<p>En los modernos observatorios instalados en Chile, observamos el\u00a0evento <strong>GRB 120714B<\/strong>, que fue particularmente largo (duraci\u00f3n de 160\u00a0s). Desde La Silla, el Detector \u00d3ptico e Infrarrojo Cercano de\u00a0Explosiones de Rayos Gamma (GROND, por sus siglas en ingl\u00e9s) montado\u00a0en el telescopio MPG de 2.2m revel\u00f3 la contribuci\u00f3n de la SN sobre el\u00a0brillo tard\u00edo del GRB alrededor de 15 d\u00edas despu\u00e9s de la\u00a0explosi\u00f3n. Desde Paranal, el espectr\u00f3grafo FORS2 montado en el\u00a0Telescopio Muy Grande (VLT, por sus siglas en ingl\u00e9s) nos permiti\u00f3\u00a0medir una velocidad de expansi\u00f3n de 43 mil km\/s, que es la m\u00e1s alta<br \/>\nencontrada en SNs (ver Fig. 1 para una comparaci\u00f3n con otras SNs\u00a0asociadas a GRBs). Este espectro permiti\u00f3 tambi\u00e9n clasificar a este\u00a0objeto como SN 2012eb. <strong>La energ\u00eda cin\u00e9tica y la masa total eyectada de\u00a0la SN resultaron ser tambi\u00e9n valores extremos comparados con otros\u00a0eventos: 10^53-10^54 erg y aproximadamente 20 masas solares,\u00a0respectivamente.<\/strong><\/p>\n<p>Esta investigaci\u00f3n fue presentada a la revista \u00abAstronom\u00eda y\u00a0Astrof\u00edsica\u00bb como un art\u00edculo que tambi\u00e9n incluy\u00f3 el an\u00e1lisis de otras\u00a0tres monstruosas explosiones de GRB-SNs y de su entorno\u00a0(<a href=\"https:\/\/arxiv.org\/abs\/1808.02710\">https:\/\/arxiv.org\/abs\/1808.02710<\/a>).<\/p>\n<figure id=\"attachment_18545\" aria-describedby=\"caption-attachment-18545\" style=\"width: 1200px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2018\/11\/2018_11_01_FOlivares1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18545 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2018\/11\/2018_11_01_FOlivares1.png\" alt=\"\" width=\"1200\" height=\"903\" \/><\/a><figcaption id=\"caption-attachment-18545\" class=\"wp-caption-text\">Evoluci\u00f3n de las velocidades de expansi\u00f3n medidas con la l\u00ednea SiII\u03bb6355 para SN 2012eb (punto azul) y para una muestra de comparaci\u00f3n de otras SNs asociadas a GRBs con datos espectrosc\u00f3picos suficientemente buenos.<\/figcaption><\/figure>\n<p>[\/fusion_text][:]<\/p>","protected":false},"excerpt":{"rendered":"<p>Por Felipe Olivares,\u00a0investigador postdoctoral MAS<\/p>","protected":false},"author":3,"featured_media":29158,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","footnotes":""},"categories":[59],"tags":[],"class_list":["post-18543","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columnas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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