Sökning: "exoplanets"

Visar resultat 21 - 25 av 54 uppsatser innehållade ordet exoplanets.

1. 21. The Milky Way and its Exoplanets

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Jesper Nielsen; [2021]
   Nyckelord :Planets and Satellites; Exoplanets; Occurrence Rates; Physics and Astronomy;

   Sammanfattning : The detections of over 4000 exoplanets as of today has shown that they exist in a wide range of different configurations, otherwise known as architectures. Recently, studies have been made trying to link the environment of host stars to the architectures of their planetary systems and have found that the architectures of planetary systems may not necessarily be uniform in the Milky Way. LÄS MER

3. 22. Planning Observations of Terrestrial ExoplanetsAround M Type Stars with CRIRES+

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Jonas Zbinden; [2021]
   Nyckelord :;

   Sammanfattning : In recent decades, thousands of exoplanets have been discovered. The next step is to characterize theobserved planets in terms of their radii, masses, density, physical conditions and composition of theiratmospheres. LÄS MER

4. 23. Effects of planetary radius contraction on scattering

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Viktor Hrannar Jónsson; [2020]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : The observed high orbital eccentricities of many giant exoplanets is thought to be the result of gravitational scattering between planets. Outcomes of planet-planet scattering can result in some planets being lost by ejections into interstellar space, or collisions between planets or with the star. LÄS MER

5. 24. 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

7. 25. 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