[Astronomy seminar] Astronomy seminar 24/5 at 10:30 FC61: Dainis Dravins

[Astronomy seminar announcements]

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)
>
>