Sökning: "exoplaneter"

Visar resultat 6 - 10 av 21 uppsatser innehållade ordet exoplaneter.

  1. 6. Towards a high resolution view of infrared line formation

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    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. 7. 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. 8. 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. 9. 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

  7. 10. Mean Motion Resonances and Planetary Scattering

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Erik Dahlöf; [2018]
    Nyckelord :mean motion resonance; orbit resonance; planetary dynamics; planet-planet scattering; planetary scattering; eccentricity; inclination; planet systems; disturbing force; orbit dynamics; orbital elements; planets; exoplanets; scattering phase; relaxation; dynamical instabilities; N-body; protoplanetary disk; planet migration; eccentricity damping; inclination damping; planet-disk interactions; Physics and Astronomy;

    Sammanfattning : The observed distribution of giant exoplanet eccentricities and inclinations are significantly larger than what is measured for their Solar system analogues, Jupiter and Saturn. Since the first observations of exoplanets, planet-planet scattering has been proposed as a possible mechanism for exciting the eccentricities and inclinations of giant exoplanets. LÄS MER