Sökning: "exoplaneter"

Visar resultat 1 - 5 av 17 uppsatser innehållade ordet exoplaneter.

  1. 1. Detecting Earth-like exoplanets using high-dispersion nulling interferometry

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Germain Garreau; [2021]
    Nyckelord :Applied Physics; Instrumental Optics; Exoplanets Detection; Interferometry; Spectroscopy; Tillämpad fysik; Instrumentoptik; Exoplaneter upptäckt; Interferometri; Spektroskopi;

    Sammanfattning : The detection of Earth-like exoplanets and the characterization of their atmospheres is a challenge one needs to solve to assess their habitability and the presence of life in the universe. If this challenge is still unresolved today, even in the era of giant telescopes, it is mainly because of the very high contrast between these exoplanets and their host star and also their proximity. LÄS MER

  2. 2. Towards a high resolution view of infrared line formation

    Master-uppsats, Lunds universitet/Astronomi

    Författare :Martin Schmidt Montelius; [2021]
    Nyckelord :Spectroscopy; Near infrared; K giants; Galactic archeaology; Galactic chemical evolution; Abundances; Milky Way; Physics and Astronomy;

    Sammanfattning : Observing in the infrared has many benefits, such as seeing through the interstellar dust in the galaxy, easier use of adaptive optics, and better flux ratios for direct observations of exoplanets. Before the infrared spectral range can be utilised for highly accurate stellar spectroscopy there is a need for a better understanding of both stellar modelling and the atomic physics that go into forming spectral lines. LÄS MER

  3. 3. Advanced Characterization of Exoplanet Host Stars

    Master-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Khaled Al Moulla; [2020]
    Nyckelord :stars: exoplanet hosts - fundamental parameters - spectroscopy: HARPS - SME; stjärnor: exoplanetvärdar - fundamentala parametrar - spektroskopi: HARPS - SME;

    Sammanfattning : The spectroscopic determination of stellar properties is important for subsequent studies of exoplanet atmospheres. In this thesis, HARPS data for 6 exoplanet-hosting, late-type stars is processed to achieve an average signal-to-noise ratio of ~105. LÄS MER

  4. 4. The Almighty Quasar — Destroyer of Worlds

    Kandidat-uppsats, Uppsala universitet/Observationell astrofysik

    Författare :Julia Ahlvind; [2019]
    Nyckelord :Astronomy; Habitability; Quasars; Active galactic nucleus; AGN;

    Sammanfattning : In the study of habitability of terrestrial exoplanets, both life-supporting conditions and the prevalence of transient life-threatening events need to be considered. One type of hazardous effect that has so far not received much attention is the thermal effect of a nearby active galactic nucleus (AGN), or in this particular case, the class of the AGN known as a quasar. LÄS MER

  5. 5. The Relationship Between a Variable Orbital Eccentricity and Climate on an Earth-Like Planet

    Kandidat-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Ellinor Wanzambi; [2019]
    Nyckelord :climate; climate models; exoplanets; Earth-like planets; klimat; klimatmodeller; exoplaneter; jordliknande planeter;

    Sammanfattning : By using climate models based on the Earth’s climate, you can get information about how the climate on exoplanets can look like. ROCKE-3D is a general circulation model based on ModelE2, which is used for simulations of modern and prehistoric Earth’s climate. LÄS MER