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<p>Reminder, Dan's seminar will be in 30 min!</p>
<p>C<br>
</p>
<div class="moz-cite-prefix">On 01/02/2022 10:03, Chris Usher wrote:<br>
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cite="mid:825b2366-3605-6e28-ad02-e1b718e2af84@astro.su.se">
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<p>On Friday the 4th at 10:30 we have our second seminar of the
year with Dan Perley (Liverpool John Moores University) speaking
via Zoom.<br>
</p>
<p><b>A Complete Survey of the Catastrophic Universe</b><br>
<br>
While it looks static to the naked eye, the night sky is filled
with activity: a star explodes somewhere in the observable
universe once every second. The vast majority of these
explosions go unheralded, but a new generation of synoptic
optical surveys are finally enabling us to systematically chart
the entire parameter space of these dramatic endpoints of
stellar evolution. I will describe how we are using the Zwicky
Transient Facility to investigate this "zoo" of cosmic
explosions. I will first present new measurements of the rates,
luminosity functions, and demographics of a variety of
well-established supernova types and illustrate how these
observations are providing new insights into the connection
between the lives and deaths of their massive stellar
progenitors. Then, moving to the extremes of stellar evolution
I will summarize our discoveries of the rarest and most
energetic explosions: off-axis gamma-ray bursts, "dirty"
fireballs from moderately-relativistic jets, direct-collapse
events, and kilonovae.</p>
<p>We are trying something new this year with leaving the Zoom
call open after the formal hour of the seminar is up to allow
the speaker, if they wish, to chat informally with anyone who is
interested.</p>
<p>Thanks<br>
<br>
Chris and Carolina</p>
<p>Christopher Usher is inviting you to a scheduled Zoom meeting.
<br>
<br>
Topic: Astronomy Department Seminar - Dan Perley <br>
Time: Feb 4, 2022 10:30 AM Stockholm <br>
<br>
Join Zoom Meeting <br>
<a class="moz-txt-link-freetext"
href="https://stockholmuniversity.zoom.us/j/66820045606?pwd=em5rS2ptMWIwVXVvNkVZL002NWxwZz09"
moz-do-not-send="true">https://stockholmuniversity.zoom.us/j/66820045606?pwd=em5rS2ptMWIwVXVvNkVZL002NWxwZz09</a>
<br>
<br>
Meeting ID: 668 2004 5606 <br>
Passcode: NSenCIPabo </p>
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