Sökning: "planetesimals"

Visar resultat 1 - 5 av 10 uppsatser innehållade ordet planetesimals.

1. 1. The Effect of Gravitational Encounters on Binary Planetesimals

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :John Gillan; [2021]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Binary planetesimals in the Kuiper belt can experience close encounters with other bodies. These encounters can disturb the orbital dynamics of the binary in several ways. Energy can be added to the system by the impactor body and lead to the disruption of the binary. LÄS MER

3. 2. How did Jupiter form?

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Calle Ahlgren; [2019]
   Nyckelord :Planet formation; Planet migration; Physics and Astronomy;

   Sammanfattning : Two relatively new concepts in planetary science are planetary migration; wherein the planets migrate through the protoplanetary disk as they form, and pebble accretion; wherein the planetesimals which become terrestrial planets and giant planet cores grow through the accretion of small pebbles. Planetary migration has become a generally accepted concept but there is still much to be learned even about how it affected the formation of our own solar system. LÄS MER

4. 3. Gone With the Headwind. Characterizing Erosion Using Lattice-Boltzmann Method : and its Implication in Planet Formation

   Master-uppsats, Stockholms universitet/Fysikum

   Författare :Lukas Cedenblad; [2019]
   Nyckelord :Erosion; Planet formation; Lattice-Boltzmann;

   Sammanfattning : Erosion has a long history in science and is used in many different fields today, for example in geology for coastal erosion and in the oil industry for pipe erosion. It is very difficult to study erosion both analytically. Numerically it is difficult due to moving and shape-changing boundaries. LÄS MER

5. 4. The fate of pebbles and planetesimals entering protoplanetary envelopes

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Emil Zadera; [2019]
   Nyckelord :Planet formation; planet; protoplanet; protoplanetary envelope; protoplanetary atmosphere; protoplanetary growth; planetary growth model; accretion rate; vapour blob; vapourblob; vapour planet; transport of water; water on planet; pebbles; planetesimals; pebble accretion; planetesimal accretion; meteors; ablation; fragmentation; sublimation; protoplanetary disk; MMSN; accretion window; accretion channel; accretion; destruction; disruption; terminal velocity; gas; gasflow; shearingbox; exoplanet; Physics and Astronomy;

   Sammanfattning : Planetary embryos grow by the accretion of solid dust-material, ranging from cm- to m-sized pebbles up to km-sized planetesimals. However, the underlying size-distribution of the accreted material is poorly understood. LÄS MER

7. 5. 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