Login

NBIA Workshop on Radiation Transfer in Astrophysics

6–10 Jun 2022
Europe/Copenhagen timezone

Email inquiries to

Session

Exoplanetary Atmospheres

7 Jun 2022, 09:00

Presentation materials

There are no materials yet.

  1. 76. The Atmospheres of Exoplanets: Albedos and Phase Curves of Celestial Bodies
    Kevin Heng (University of Bern, LMU)
    07/06/2022, 09:00
    Planetary Atmospheres
    Talk

    The albedo of a celestial body is the fraction of incident starlight reflected by it. The study of the albedos of Solar System objects is at least a century old, at least in the Western world. As examples: Bond (1861) speculated on the near-unity albedo of Jupiter, while Russell (1916) observed the opposition surge of the Moon near and at full phase. The light of a planet or moon varying with...

    Go to contribution page
  2. 60. Probing the upper atmospheres of exoplanets and atmospheric escape with NLTE radiative transfer
    Antonija Oklopcic (University of Amsterdam)
    07/06/2022, 09:30
    Planetary Atmospheres
    Talk

    The helium line at 1083 nm is one of the strongest spectral features observable in transit spectroscopy of exoplanet atmospheres. As such, it is a powerful diagnostic of upper atmospheres of exoplanets, providing valuable insight into their dynamics and the process of atmospheric escape. Absorption in this line is caused by neutral helium atoms in an excited, metastable state. At low densities...

    Go to contribution page
  3. 36. NLTE effects in the atmosphere of the ultra-hot Jupiter KELT-9b
    Dr Mitchell Young (University of Oxford)
    07/06/2022, 09:50
    Planetary Atmospheres
    Talk

    Ultra-hot Jupiters (UHJs) have become prime targets for atmospheric characterisation. KELT-9b is the hottest of the known UHJs and both hydrogen Balmer lines and metal line features have been detected in the planetary transmission spectrum. I will show how NLTE effects drive the temperature pressure structure of KELT-9b's atmosphere and that NLTE effects must be taken into account in order to...

    Go to contribution page
  4. 77. Along the Line of Sight: Changing Chemical States in Cloud Forming Exoplanet Atmospheres
    Christiane Helling (Space Research Institute, Graz University of Technology), Dominic Samra
    07/06/2022, 11:00
    Planetary Atmospheres
    Talk

    Exoplanet atmospheres provide ideal atmospheric laboratories to explore atmospheres unlike anything in our Solar System. Atmosphere characterisation is also an important tool in understanding exoplanetary system formation and evolution. However, exoplanets are not globally homogeneous, as the light we observe must pass though many diverse regions any observations probe a wide variety of...

    Go to contribution page
  5. 49. Improving planetary atmosphere characterization by 3D NLTE modeling of the stellar centre-to-limb effect
    Gloria Canocchi (Stockholm University)
    07/06/2022, 11:30
    Planetary Atmospheres
    Talk

    The center-to-limb variation (CLV) of the stellar lines across the stellar disk is an important effect for planetary transit spectroscopy. Indeed the variation of spectral line profiles when the planet transits different part of the stellar disk can affect the determination of elemental abundances in the planetary atmospheres, as shown by Yan et al. (2017). Accurately modeling the CLV effect...

    Go to contribution page
  6. 63. Why does thermodynamic equilibrium matter when measuring transition probabilities?
    Maria Teresa Belmonte (Universidad de Valladolid)
    07/06/2022, 11:50
    Planetary Atmospheres
    Talk

    High-quality transition probabilities (oscillator strengths, log(gf)) are of vital importance in the analysis of astronomical spectra. Along with spectral line wavelengths and widths, they allow astronomers not only to determine the chemical composition of stellar and exoplanetary atmospheres, but also to gain some insight into their temperature and electron density.

    For more than 30 years,...

    Go to contribution page
Building timetable...