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Burr, Zach (author)Planet formation is a topic that still has many unanswered questions, particularly regarding the formation of wide orbit giant planets. Detecting more of these types of planets can aid understanding of how they form by giving examples of what kind of planets exist. Direct imaging is uniquely well suited to detecting these kinds of planets, which...master thesis 2024
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Ras, Wilbert (author)Today, one of the major goals of modern astronomy is the search for other habitable worlds and the presence of life on them. Crucial in this search is the atmospheric characterisation of small, rocky planets orbiting in the habitable zone around solar type stars. The LIFE initiative will be able to perform atmospheric characterisation of a...master thesis 2022
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Gort, Timo (author)<i>Context.</i> In the near-future, exoplanets can be observed directly through telescopes. Although the resolution of the planet's image will only be one pixel at first, the intensity of this pixel will change over time because of the orbit around its host star and its diurnal rotation. This intensity as a function of time is called the light...bachelor thesis 2022
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Mulder, Tim (author)This thesis develops a method to map the surface of an exoplanet. The problem of exoplanet mapping sounds easy to solve. Take a few photographs of an exoplanet and sew them together to create a map of the surface. The telescope required to do this is far beyond our technological capabilities. However, our current telescopes could allow us to...bachelor thesis 2022
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Blanken, Sweder (author)In the near future, next-generation telescopes will be able to observe Earth-like exoplanets illuminated by their parent stars for long periods of time. As the distance between exoplanet and observer is enormous, exoplanets will only make up a pixel on our image. However, the observed intensity of this pixel will fluctuate over time as the...bachelor thesis 2022
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Meinke, Klaas (author)By the late 2020s or early 2030s, the next generation of telescopes will be able to directly observe the reflected starlight of Earth-like exoplanets. Because of the huge distance to other stars, such exoplanets will appear as single unresolved pixels. A single pixel can, however, provide information about what the planet looks like because its...master thesis 2021
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Joshi, Sushen (author)We have developed, from scratch, a 3D radiative transfer code based on the Monte Carlo method, that fully takes into account the spherical shape of a planetary atmosphere, multiple scattering, and the polarized nature of light. Accounting for the sphericity of an atmosphere is important for the analysis of observations near the planetary limb...master thesis 2021
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Rossi, L. (author), Berzosa-Molina, J. (author), Desert, J. M. (author), Fossati, L. (author), Muñoz, A. García (author), Haswell, C. (author), Kabath, P. (author), Kislyakova, K. (author), Stam, D.M. (author), Vidotto, A. (author)The polarization state of starlight reflected by a planetary atmosphere uniquely reveals coverage, particle size, and composition of aerosols as well as changing cloud patterns. It is not possible to obtain a comparable level of detail from flux-only observations. It is therefore a powerful tool to better understand the crucial role played by...journal article 2021
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Klindzic, D. (author), Stam, D.M. (author), Snik, Frans (author), Hoeijmakers, Jens (author), Willebrands, Michelle (author), Karalidi, Teodora (author), Pallichadath, V. (author), van Dijk, Chris (author), Esposito, Marco (author)LOUPE, the Lunar Observatory for Unresolved Polarimetry of the Earth, is a small, robust spectro-polarimeter for observing the Earth as an exoplanet. Detecting Earth-like planets in stellar habitable zones is one of the key challenges of modern exoplanetary science. Characterizing such planets and searching for traces of life requires the...journal article 2021
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Barstow, M. A. (author), Aigrain, S. (author), Barstow, J. K. (author), Barthelemy, M. (author), Evans, C. (author), Ferrari, M. (author), Garcia, M. (author), Rossi, L. (author), Stam, D.M. (author)One of the most exciting scientific challenges is to detect Earth-like planets in the habitable zones of other stars in the galaxy and search for evidence of life. During the past 20 years the detection of exoplanets, orbiting stars beyond our own, has moved from science fiction to science fact. From the first handful of gas giants, found...journal article 2021
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Hendriks, Lisanne (author)Aims: Analysing historical disk-integrated polarization data of Venus with the help of numerical simulations to learn about the time variability in cloud and haze properties, the position of the UV-absorber and the polar cap regions.<br/>Method: With numerical simulations, polarization curves will be calculated for specific input conditions. We...master thesis 2020
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Keller, Christoph U. (author), Snik, Frans (author), Patty, C. H.Lucas (author), Klindzic, D. (author), Krasteva, Mariya (author), Doelman, David S. (author), Wijnen, T.P.G. (author), Pallichadath, V. (author), Stam, D.M. (author)Many biologically produced chiral molecules such as amino acids and sugars show a preference for left or right handedness (homochirality). Light reflected by biological materials such as algae and leaves therefore exhibits a small amount of circular polarization that strongly depends on wavelength. Our Life Signature Detection polarimeter ...conference paper 2020
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van Oosterom, Simon (author)In this thesis we consider the reconstruction of albedo maps of exoplanets. This is done with a new variant of spin-orbit tomography that has been described in [Cowan and Agol, 2008] and more in depth in [Fujii and Kawahara, 2012]. This method reconstructs the albedo map from the reflected-light curve, the total intensity of the light that...bachelor thesis 2019
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Leveratto, Serban (author)As part of the New Earths in the Alpha Cen Region (NEAR) experiment, VISIR, an imager and spectrometer for the mid-infrared at the Very Large Telescope (VLT) of the European Southern Observatory, will be soon upgraded to improve its performance in terms of high contrast and sensitivity for the detection of Earth-like planets in the Alpha...master thesis 2018
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Groot, Ashwyn (author)Previous studies have investigated the remote appearance of Earth-like exoplanets in the prospect of retrieving biosignatures of planets orbiting extrasolar stars, utilizing the variation of (polarized) flux. However, these studies did not use horizontally inhomogeneous models that include (1) daily cloud observations of planet Earth accounting...master thesis 2018
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Trees, Victor (author)Fresnel reflection of starlight in the oceans of exoplanets results in two main phenomena: (1) a glint in the exoplanetary ocean, whose size increases with wind speed, and (2) a maximum degree of polarization at the Brewster angle. The corresponding features in the planetary phase curve, i.e. the flux and degree of polarization of the reflected...master thesis 2018
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Cheung, Joey (author)Since the first telescopes were invented, scientists all over the Earth began to explore the universe. Till now only a microscopic fraction of the universe is discovered, and a lot more is waiting for us to be seen. As the universe is so enormous, a lot of scientists and people are asking themselves whether there is life elsewhere and if there...master thesis 2018
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Berzosa, Javi (author)The detection of moons around extrasolar planets is one of the main focuses of current and future observatories. These silent companions contribute to the planets' observed signals but are barely detectable with current methods. Numerous gaseous exoplanets are known to orbit in the habitable zones of stars, and the expected abundance of natural...master thesis 2017
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Deccia, C.M.A. (author)Exoplanets have been detected for more than 15 years. In the vast majority of instances, this has been accomplished through indirect observation. Such methods include among others the observation of radial velocity, transit photometry, and timing variations. These techniques allow for the vast majority of exoplanet detections up to date. An...master thesis 2017
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Beekman, M.W. (author)Faculty EWI and TNW. BSc Industrial and Applied Mathematics and Applied Physics. In this thesis we consider reflective light-curves of planets, graphs of the intensity of the light originating from the parent star that the planet reflects versus time. In almost all instances, planets are modelled as spheres, like in [1] and [2]. However, planets...bachelor thesis 2016
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