Sökning: "exoplanet"

Visar resultat 21 - 25 av 41 uppsatser innehållade ordet exoplanet.

1. 21. Detecting exoplanets with machine learning : A comparative study between convolutional neural networks and support vector machines

   Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Jacob Tiensuu; Maja Linderholm; Sofia Dreborg; Fredrik Örn; [2019]
   Nyckelord :Machine learning; Exoplanet; Support vector machine; Convolution neuralnetwork;

   Sammanfattning : In this project two machine learning methods, Support Vector Machine, SVM, and Convolutional Neural Network, CNN, are studied to determine which method performs best on a labeled data set containing time series of light intensity from extrasolar stars. The main difficulty is that in the data set there are a lot more non exoplanet stars than there are stars with orbiting exoplanets. LÄS MER

3. 22. Detailed analysis of the chemical composition of stars harboring Earth-like planets

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Lorena Acuña Aguirre; [2019]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Context. The planet-metallicity correlation for gaseous giants is widely accepted through spectroscopic studies. However, whether a similar correlation exists for terrestrial planets is a debated subject. LÄS MER

4. 23. 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

5. 24. Searching for Exoplanets in K2 Data

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Iskra Georgieva; [2018]
   Nyckelord :exoplanets; transit method;

   Sammanfattning : The field of extrasolar planets is undoubtedly one of the most exciting and fast-moving in astronomy. Thanks to the Kepler Space Telescope, which has given us the Kepler and K2 missions, we now have thousands of planets to study and thousands more candidates waiting to be confirmed. LÄS MER

7. 25. 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