Sökning: "protoplanetary disk formation"

Visar resultat 6 - 10 av 11 uppsatser innehållade orden protoplanetary disk formation.

1. 6. Planet migration in evolving protoplanetary discs

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

   Författare :Linn Eriksson; [2018]
   Nyckelord :Planets and satellites: formation; Protoplanetary discs: evolution; Planet-disc interactions; Physics and Astronomy;

   Sammanfattning : The rate of migration and accretion onto protoplanets is greatly influenced by the structure of the surrounding protoplanetary disc. This structure changes with time as the disc evolves on a million year timescale, implying that the process of planet formation might look very different depending on when it was initiated. LÄS MER

3. 7. Can planet formation explain the observed differences in the chemical composition of binary stars?

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Rebecca Forsberg; [2017]
   Nyckelord :binary stars; planet formation; protoplanetary disc; Physics and Astronomy;

   Sammanfattning : A suggested explanation for the observed differences in chemical abundances in binary stars has been planet formation (e.g. Tucci Maia et al. 2014). LÄS MER

4. 8. Giant planet formation around HR8799

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

   Författare :Dan Wallsby; [2017]
   Nyckelord :HR8799; Planet formation; Protoplanetary disks; Giant planets; Astronomy; Migration; Dynamics; Physics and Astronomy;

   Sammanfattning : In the thriving field of exoplanet research new discoveries are made all the time, and while most of the observed systems can be explained with classical planet formation models - some are much harder to explain. When stars form they are often surrounded by the remaining material of the nebulae they formed from. LÄS MER

5. 9. Grain size distribution in protoplanetary disks

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

   Författare :Erik Dahlöf; [2016]
   Nyckelord :grain growth; protoplanetary disk; grain size distribution; coagulation; fragmentation; opacity; disk opacity; accretion disk; disk structure; Physics and Astronomy;

   Sammanfattning : Protoplanetary disks consist of matter in both gas and solid form. The sizes of the solid particles, dust grains, although in minority compared to the gas, are important in the formation of larger bodies such as planetesimals. This is a topic which has been widely explored. LÄS MER

7. 10. Formation of super-Earths via pebble accretion onto planetesimals

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Daniel Mikkola; [2015]
   Nyckelord :planet; formation; planet formation; exoplanets; pebble; accretion; pebble accretion; Physics and Astronomy;

   Sammanfattning : Data from NASA's Kepler space telescope, which searches for exoplanets via the transit method, produced 1108 new planetary candidates in 2013 with a total of 91% being smaller than Neptune in size. These were mostly super-Earths, terrestial planets between Earth and Neptune in size, with orbits around 10 days. LÄS MER