Searched for: subject%3A%22Radiative%255C+Transfer%22
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Mahapatra, G. (author), Abiad, F. (author), Rossi, L. (author), Stam, D.M. (author)
Context. Terrestrial-type exoplanets in or near stellar habitable zones appear to be ubiquitous. It is, however, unknown which of these planets have temperate, Earth-like climates or for example, extreme Venus-like climates. Aims. Technical tools to distinguish different kinds of terrestrial-type planets are crucial for determining whether a...
journal article 2023
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Lok, Pieter (author)
The performance of hydrostatic bearings is in part decided by their lubrication-film height shape. Imaging the shape can be done by dissolving fluorescent dyes in the layer. However, current imaging techniques are rooted in heuristics, and as such, their physics, design parameters, and error sources are not quantitively understood. To fully...
master thesis 2022
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Trees, V.J.H. (author), Stam, D.M. (author)
ontext. Numerical simulations of starlight that is reflected by Earth-like exoplanets predict habitability signatures that can be searched for with future telescopes.<br/><br/>Aims. We explore signatures of water oceans in the flux and polarization spectra of this reflected light.<br/><br/>Methods. With an adding-doubling algorithm, we computed...
journal article 2022
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Kreynen, Dylan (author)
Subsurface firn processes play a crucial role in ice sheet mass loss mechanisms. On Greenland surface meltwater percolates to deeper layers where porous firn retains it, directly inhibiting runoff. However, secondary effects such as the formation of impermeable ice slabs may indirectly and irreversibly accelerate runoff and with it global sea...
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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Kulkarni, Shubham (author)
Despite a large number of in-situ missions, only VeGa-2 provided the high-resolution thermal measurements of the deep atmosphere of Venus below 12 km and they indicated a highly unstable layer below 7 km altitude. Lebonnois and Schubert (2017) tried to explain the VeGa-2 measurements by introducing a theory of a composition gradient in the deep...
master thesis 2021
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Fayolle-Chambe, M.S. (author), Quirico, E. (author), Schmitt, B. (author), Jovanovic, L. (author), Gautier, T. (author), Carrasco, N. (author), Grundy, W. (author), Vuitton, V. (author), Poch, O. (author), Protopapa, Silvia (author)
Pluto's fly-by by the New Horizons spacecraft in July 2015 has revealed a dark reddish equatorial region, named Cthulhu, covered by a dark, non-icy material whose origin and composition have yet to be determined. It has been suggested that this material could form from the sedimentation of photochemical aerosols, originating from dissociation...
journal article 2021
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Taylor Parkins, S.K. (author), Murthy, Swathi (author), Picioreanu, C. (author), Kühl, Michael (author)
Coral reefs are constructed by calcifying coral animals that engage in a symbiosis with dinoflagellate microalgae harboured in their tissue. The symbiosis takes place in the presence of steep and dynamic gradients of light, temperature and chemical species that are affected by the structural and optical properties of the coral and their...
journal article 2021
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Hadžisejdić, Nino (author)
Martian mesospheric CO2 ice clouds are formed out of the main constituent of the Martian atmosphere: CO2 gas. The nature of these clouds is poorly understood, characterization of these clouds in terms of particle morphology would give valuable insight into the Martian climate. So far, these CO2 clouds have only been detected from space. In this...
master thesis 2020
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Groot, A. (author), Rossi, L.C.G. (author), Trees, V.J.H. (author), Cheung, J. C.Y. (author), Stam, D.M. (author)
Context. Understanding the total flux and polarization signals of Earth-like planets and their spectral and temporal variability is essential for the future characterization of such exoplanets. Aims. We provide computed total (F) and linearly (Q and U) and circularly (V) polarized fluxes, and the degree of polarization P of sunlight that is...
journal article 2020
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de Pater, I. (author), Sault, R. J. (author), Wong, Michael H. (author), Fletcher, Leigh N. (author), DeBoer, David (author), Butler, Bryan (author)
We observed Jupiter four times over a full rotation (10 h) with the upgraded Karl G. Jansky Very Large Array (VLA) between December 2013 and December 2014. Preliminary results at 4–17 GHz were presented in de Pater et al. (2016); in the present paper we present the full data set at frequencies between 3 and 37 GHz. Major findings are: i) The...
journal article 2019
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de Pater, I. (author), Sault, R. J. (author), Moeckel, Chris (author), Moullet, Arielle (author), Wong, Michael H. (author), Goullaud, Charles (author), Deboer, David (author), Butler, Bryan J. (author), Bjoraker, Gordon (author)
We obtained the first maps of Jupiter at 1-3 mm wavelength with the Atacama Large Millimeter/Submillimeter Array (ALMA) on 2017 January 3-5, just days after an energetic eruption at 16.5S jovigraphic latitude had been reported by the amateur community, and about two to three months after the detection of similarly energetic eruptions in the...
journal article 2019
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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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Mewani, Prashant (author)
The Process and Energy department of the Mechanical, Maritime and Materials faculty of TU Delft and the Dutch company Petrogas Gas-Systems B.V. are working together on the commissioning of a small 50 kW (th) Indirectly Heated Bubbling Fluidised Bed Steam Reformer (IHBFBSR) which will be used to gasify the energy crop Miscanthus. However, the new...
master thesis 2018
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Rossi, L.C.G. (author), Berzosa Molina, J. (author), Stam, D.M. (author)
PYMIEDAP (the Python Mie Doubling-Adding Programme) is a Python-based tool for computing the total linearly and circularly polarized fluxes of incident unpolarized sunlight or starlight that is reflected by solar system planets or moons, respectively, or by exoplanets at a range of wavelengths. The radiative transfer computations are based on...
journal article 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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Karapakula Jaganath Rao, Sukanth (author)
In the search for understanding the formation and evolution of a solar system, terrestrial planets &amp; any exoplanetary systems, the understanding of the evolution &amp; formation of giant planet's play a crucial role. The primary goal is to study the atmospheres, their physical &amp; chemical processes governed by gases, clouds, and hazes....
master thesis 2018
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Wu, Y. (author)
The Aerosol Optical Depth (AOD), a measure of the scattering and absorption of light by aerosols, has been extensively used for scientific research such as monitoring air quality near the surface due to fine particles aggregated, aerosol radiative forcing (cooling effect against the warming effect by carbon dioxide CO2 ), aerosol long-term trend...
doctoral thesis 2018
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Rossi, L.C.G. (author), Stam, D.M. (author)
The circular polarization of light that planets reflect is often neglected because it is very small compared to the linear polarization. It could, however, provide information on a planet’s atmosphere and surface, and on the presence of life, because homochiral molecules that are the building blocks of life on Earth are known to reflect...
journal article 2018
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