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<div class="moz-cite-prefix">On 2019-09-23 10:25, Alexis Brandeker
wrote:<br>
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<div class="PlainText">Astronomy seminar<br>
<br>
Time & location: Friday September 27, 10:30 in FC61<br>
<br>
Speaker: Katja Poppenhäger (AIP, Potsdam)<br>
<br>
Title: Understanding the evolution of star-exoplanet systems<br>
<br>
Abstract:<br>
Stars and their exoplanets evolve together over billions of
years, just <br>
like our own solar system. Many known exoplanetary systems
have planets <br>
orbiting their host stars at much closer distances than we
observe in <br>
the solar system, with orbital periods of only a few days.
In such <br>
systems one expects the star and its close-in planet
to <br>
interact through tidal and magnetic forces, tying their
evolution <br>
together. These interactions can give us insights into
fundamental <br>
properties of star- planet systems which are hard to
constrain <br>
otherwise: the time scale over which close-in planets
spiral into the <br>
star, the evolution of stellar activity, and the amount of
atmospheric <br>
evaporation and the habitability for all planets in a system
with a <br>
close-in planet. Gaia and other telescopes have now opened
up new <br>
pathways to measure how stars and planets interact with each
other. I <br>
will present new approaches to test for planet-induced
influences on <br>
stars through wide binary systems, motivate a new look at
stellar <br>
magnetic activity measurements, and discuss how planetary
atmospheres <br>
can evaporate over the lifetime of exoplanets.<br>
<br>
Also TODAY 23/9 @ 13:00: PhD Defence Anders Nyholm in FB42<br>
<br>
4/10 (Fri) @ 10:30: Tim Dietrich (Amsterdam)<br>
11/10 (Fri) @ 10:30: *POSTPONED TO 2020-02-07* John Airy (SU
Science <br>
Education)<br>
18/10 (Fri) @ 10:30: Marta Silva (Oslo ITA)<br>
24-26/10 (Thu-Sat): Astronomdagarna<br>
<br>
<br>
All welcome! Alexis Brandeker (Astronomy seminar organiser
2019)<br>
<br>
<br>
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