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<div class="moz-cite-prefix">On 2019-09-09 07:33, Alexis Brandeker
wrote:<br>
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cite="mid:03d29ab6-4124-2b4b-04fb-1782996d2a67@astro.su.se">
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Astronomy seminar<br>
<br>
Time & location: Friday September 13, 10:30 in FC61<br>
<br>
Speaker: Carina Persson (Chalmers)<br>
<br>
Title: Exoplanet discovery and characterisation<br>
<br>
Abstract:<br>
Observations during the last decade have uncovered large
populations of exoplanets without any counterparts in our own
planetary system. This diversity has been one of the major
discoveries. One of the most powerful tools in the hunt for new
exoplanets is dedicated space mission surveys using the technique
of ultra-high precision transit photometry. This allows not only
discoveries of new planets, but also measurements of the radius
relative to the host star and orbital parameters. By combining the
photometry from space missions with ground-based radial velocity
measurements, true planet masses and bulk densities can be
obtained. But although more than 4000 exoplanets have been
detected to date, mainly by the Kepler space telescope, far fewer
have been fully characterised and hence the composition and
internal structure for most exoplanets are unknown. Only a few
tens of Super-Earths have been securely identified. This paucity
is related to the faintness of the target stars and a new
generation of spacecrafts is therefore specifically targeting
bright stars. NASA's TESS spacecraft, launched in April 2018, is
an all sky survey mission of short period planets orbiting bright
stars which will enable precise follow-up observations. CHEOPS
(Characterising Exoplanet Satellite), to be launched 17 Dec 2019,
is a European mission equipped with ultra-high precision
photometers. The targets will be bright stars already known to
host exoplanets and will be observed individually. The European
PLATO mission with a launch in 2026 is a next-generation
planet-hunter with an emphasis on rocky planets in the habitable
zone around solar-type stars. In this talk, I will give an
overview of our work at Chalmers and the collaboration with the
international KESPRINT consortium.<br>
<br>
Other upcoming activites:<br>
<br>
18/9 (Wed) @ 10:00: PhD Defence Emanuel Gafton in FA31<br>
20/9 (Fri) @ 10:30: [CANCELLED: John Miller (Oxford)]<br>
23/9 (Mon) @ 13:00: PhD Defence Anders Nyholm in FB42<br>
27/9 (Fri) @ 10:30: Katja Poppenhaeger (Potsdam)<br>
4/10 (Fri) @ 10:30: <span style="font-size:12pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;" id="docs-internal-guid-6e813b0c-7fff-f8fc-5870-62e7048ff5d4">Tim Dietrich (Amsterdam)</span><br>
<br>
All welcome! Alexis Brandeker (Astronomy seminar organiser 2019)<br>
<br>
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