[Astronomy seminar] Astronomy seminar TODAY at 10:30 FC61: Dainis Dravins

[Astronomy seminar announcements]

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