Sökning: "Giant planets"

Visar resultat 11 - 15 av 18 uppsatser innehållade orden Giant planets.

1. 11. Formation and Evolution of Protoplanetary Disks

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Johan Appelgren; [2019]
   Nyckelord :protoplanetary disk; protoplanetary disk formation; protoplanetary disk evolution; planet formation; Physics and Astronomy;

   Sammanfattning : A star forms with a surrounding protoplanetary disk after the collapse of a molecular cloud core. Subsequently, over a period of several Myr this protoplanetary disk of dust and gas is accreted onto the host star. We model the formation and evolution of such a protoplanetary disk using a one-dimensional numerical model. LÄS MER

3. 12. 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

4. 13. Simulations of the lunar-forming impact using a new equation of state

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

   Författare :Robert Wissing; [2017]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : In this thesis we add a temperature dependence to the newly developed variable polytrope equation of state (Varpoly EOS) from Weppner et al. (2015), making it more universal and more applicable for planetary simulations. LÄS MER

5. 14. Chemical composition of giant planet hosts

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Frida Ekstrand; [2017]
   Nyckelord :chemical composition; planet hosts; stellar twins; differential abundance analysis; Physics and Astronomy;

   Sammanfattning : Does the formation of planets give imprints on the chemical composition of the host star? In order to test this theory a differential abundance analysis (i.e. comparing two stars' abundances to each other) was carried out on a few stars with and without known planets, to see if any differences were found. LÄS MER

7. 15. Dynamical Stability of Planetary Systems

   Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Aikaterini Stergiopoulou; [2017]
   Nyckelord :;

   Sammanfattning : The study of dynamical stability in planetary systems has become possible during the last few decades due to the development of numerical methods for long-term integrations of N-body systems. Since the 90’s the number of exoplanet detections has been increased significantly, making the simulations of other real planetary systems besides the Solar System feasible. LÄS MER