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<div class="moz-cite-prefix">On 2019-05-21 11:04, Alexis Brandeker
wrote:<br>
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<div class="PlainText">Astronomy seminar (now with abstract)<br>
<br>
Time & location: Friday May 24, 10:30 in FC61<br>
<br>
Speaker: Dainis Dravins (Lund University)<br>
<br>
Title: Radial Velocities and Wavelength Shifts - Stellar
Spectra and <br>
Exoplanet Detection<br>
<br>
Abstract:<br>
Highest-precision radial velocities are needed both to find
Earth-like <br>
exoplanets and to follow the expansion of the Universe.
While the <br>
required instrumentation is becoming available, limitations
are now set <br>
by the physics of spectral-line formation. Dynamical
motions in stellar <br>
atmospheres cause spectral lines to become asymmetric and
their <br>
wavelengths to “flicker”. 3-D hydrodynamic models reveal
patterns of <br>
wavelength displacements across stellar disks and such
models can now be <br>
tested also for stars other than the Sun, exploiting
exoplanet <br>
transits. Differential spectroscopy between various transit
phases <br>
provide spectra of small stellar surface segments
temporarily hidden <br>
behind the planet. Ongoing exoplanet surveys are likely to
find <br>
additional suitable host stars for spatially resolved
stellar <br>
spectroscopy, identifying routes toward finding “true” Earth
analogs.<br>
<br>
Next upcoming events:<br>
31/5 (Fri) @ 10:30: No seminar (klämdag)<br>
7/6 (Fri) @ 10:30: No seminar (klämdag)<br>
14/6 (Fri) @ 10:30: Christian Herenz (SU Astronomy)<br>
<br>
All welcome! Alexis Brandeker (Astronomy seminar organiser
2019)<br>
<br>
<br>
On 2019-05-20 7:09 , Alexis Brandeker wrote:<br>
> Astronomy seminar<br>
><br>
> Time & location: Friday May 24, 10:30 in FC61<br>
><br>
> Speaker: Dainis Dravins (Lund University)<br>
><br>
> Title: Radial Velocities and Wavelength Shifts --
Stellar Spectra and<br>
> Exoplanet Detection<br>
><br>
> Next upcoming events:<br>
> 31/5 (Fri) @ 10:30: No seminar (klämdag)<br>
> 7/6 (Fri) @ 10:30: No seminar (klämdag)<br>
> 14/6 (Fri) @ 10:30: Christian Herenz (SU Astronomy)<br>
><br>
> All welcome! Alexis Brandeker (Astronomy seminar
organiser 2019)<br>
><br>
><br>
<br>
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