Sökning: "exoplanets"

Visar resultat 1 - 5 av 31 uppsatser innehållade ordet exoplanets.

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

    Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper; Uppsala universitet/Institutionen för teknikvetenskaper; Uppsala universitet/Institutionen för teknikvetenskaper; 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

  2. 2. Implementing an Algorithm for Spectrum Extraction of Circumstellar Objects with High-Dispersion Spectroscopy

    Master-uppsats, Stockholms universitet/Institutionen för astronomi

    Författare :Marcus Karlsson; [2019]
    Nyckelord :Astronomy; Spectroscopy; Exoplanets; Circumstellar Objects; Direct Imaging;

    Sammanfattning : In this thesis project, we study the field of high-dispersion spectroscopy and methods for extracting the spectrum of circumstellar objects such as exoplanets from the combined signal of a stellar system. One of the only techniques for detecting absorption lines in exoplanetary atmospheres is to directly image a planet and record the reflected light. LÄS MER

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

    Master-uppsats, Lunds universitet/Astronomi

    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. 4. 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. 5. 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