<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear all,<div class=""><br class=""></div><div class="">A reminder for todays talk by Anders Jerkstrand.</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div class=""><span class=""><a href="https://stockholmuniversity.zoom.us/j/69389017813" class="">https://stockholmuniversity.zoom.us/j/69389017813</a></span></div></div></blockquote><br class=""></div><div class="">Arjan and Janet</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 12 Oct 2020, at 11:08, Janet Ting-Wan Chen <<a href="mailto:janet.chen@astro.su.se" class="">janet.chen@astro.su.se</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class=""><span style="font-size: 14px;" class="">Dear all,</span></div>
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<div class=""><span style="font-size: 14px;" class="">On Friday October 16 at 10:30 we will have the next Astronomy Seminar, remotely via zoom.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Our speaker is Anders Jerkstrand from the Stockholm University.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Title: Discovery of a massive iron reservoir in superluminous supernova SN 2006gy.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Abstract: The brightest and longest-lasting supernovae radiate about about a hundred times more energy than typical events. These “superluminous” supernovae were discovered only about 15 years ago, and their
stellar progenitors and the mechanisms by which they radiate so much energy are under much debate. SN 2006gy was one of the first observed such supernovae, and still one of the brightest ever seen. It showed signs of circumstellar interaction with a massive
hydrogen-rich envelope that must have been ejected shortly before the supernova. In 2008 spectroscopy of the ejecta revealed emission lines that had not been seen before in any supernova and could not be identified. I present a resolution to this long-standing
mystery, showing that the lines can be convincingly identified with neutral iron. Further, the properties of the lines point towards a large mass of iron in the ejecta, at least a third of a solar mass. I discuss how this new discovery means problems for
most models proposed so far for SN 2006gy - all involving the explosion of a very massive star - and outline a path toward a new scenario instead involving a white dwarf spiralling into the envelope of a red giant or supergiant companion.</span></div>
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<div class=""><span style="font-size: 14px;" class=""><a href="https://www.albanova.se/event/discovery-of-a-massive-iron-reservoir-in-superluminous-supernova-sn-2006gy/" class="">https://www.albanova.se/event/discovery-of-a-massive-iron-reservoir-in-superluminous-supernova-sn-2006gy/</a></span></div>
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<div class=""><span style="font-size: 14px;" class="">We will have the colloquium using zoom. You will find the invitation at the end of this email.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Some guidelines:</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">1) Join the session with your microphone muted.</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. </span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp.</span></div>
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<div class=""><span style="font-size: 14px;" class="">We hope to see all of you there!</span></div>
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<div class=""><span style="font-size: 14px;" class="">Arjan & Janet</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Upcoming events: </span></div>
<div class=""><span style="font-size: 14px;" class="">23/10: Charlotte Angus (DARK, Denmark)</span></div>
<div class=""><span style="font-size: 14px;" class="">30/10: Höstlov</span></div>
<div class=""><span style="font-size: 14px;" class="">6/11: Jorryt Matthee (ETH, Zurich)</span></div>
<div class=""><span style="font-size: 14px;" class="">===================================================</span></div>
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<div class=""><span style="font-size: 14px;" class="">Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting.</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Topic: Astronomy Seminar Anders Jerkstrand</span></div>
<div class=""><span style="font-size: 14px;" class="">Time: Oct 16, 2020 10:20 AM Stockholm</span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Join Zoom Meeting</span></div>
<div class=""><span style="font-size: 14px;" class=""><a href="https://stockholmuniversity.zoom.us/j/69389017813" class="">https://stockholmuniversity.zoom.us/j/69389017813</a></span></div>
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</span></div>
<div class=""><span style="font-size: 14px;" class="">Meeting ID: 693 8901 7813</span></div>
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<div class=""><span style="font-size: 14px;" class="">Meeting ID: 693 8901 7813</span></div>
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</div></blockquote></div><br class=""><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="text-align: start; text-indent: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">-------------------------------------------<br class="">Dr. Arjan Bik<br class="">Stockholm University<br class="">AlbaNova University Center<br class="">Department of Astronomy<br class="">SE-106 91 Stockholm - Sweden<br class="">Tel: +46 (0) 85537 8549<br class=""><a href="https://www.su.se/english/profiles/abik" class="">https://www.su.se/english/profiles/abik</a></div><div style="text-align: start; text-indent: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">-------------------------------------------<br class=""></div></div>
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