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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">https://stockholmuniversity.zoom.us/j/66820045606?pwd=em5rS2ptMWIwVXVvNkVZL002NWxwZz09</a>
<br>
<br>
Meeting ID: 668 2004 5606
<br>
Passcode: NSenCIPabo
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