122 search results for “protoplanetary disks” in the Public website
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Sizing up protoplanetary disks
This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.
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Tracing the evolution of protoplanetary disks
Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)
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The puzzle of protoplanetary disk masses
My work focuses on a class of astronomical objects called protoplanetary disks.
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High-Contrast Imaging of Protoplanetary Disks
To study how planetary systems come into existence we study much younger systems still in formation.
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The Demographics of Protoplanetary Disks: from Lupus to Orion
The work presented in this thesis is based on ALMA surveys of protoplanetary disks in three star-forming regions: Lupus, OMC-2, and NGC 2024.
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Not so smooth after all: resolving dust and gas structures in protoplanetary disks
A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.
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Protoplanetary disk anatomy: examining the structure and chemistry of planetary birthplaces with simple molecules
This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.
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Linking simple molecules to grain evolution across planet-forming disks
Planets are formed in disks of gas and dust around young stars.
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Revealing the origins of solar systems: examining the formation of proto-planetary disks and binary stars
What is the origin of solar systems?
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Chemistry in embedded disks: setting the stage for planet formation
To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.
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Mind the gap: gas and dust in planet-forming disks
Promotores: Prof.dr. E.F. van Dishoeck, Prof.dr. C.P. Dullemond
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Searching explanations for mysterious structures in protoplanetary disks
In the discs of dust and gasses around young stars, mysterious structures occur. Together with professor Ewine van Dishoeck, PhD student Paolo Cazzoletti investigate how we can explain these forms, such as rings, spirals and holes. On 12 December, he will defend his thesis.
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Ice and Gas in Protostellar Clouds and Planet-forming Disks
This thesis takes steps toward understanding the interaction between gas-phase and solid-state molecules in star- and planet-forming regions.
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Inextricable ties between chemical complexity and dynamics of embedded protostellar regions
Promotor: E. F. van Dishoeck, Co-promotor: C. Walsh
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Protostellar jets and planet-forming disks: Witnessing the formation of Solar System analogues with interferometry
The focus of this thesis is how stars like our Sun and planets like Jupiter, Saturn, and Earth are formed.
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The Infrared Spectrum of Massive Protostars
We have conducted a full spectral line survey of the 3-13 micron region of two massive protostars, AFGL 2591 and AFGL 2136, for the first time at high spectral resolution.
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Uncovering the ingredients for planet formation
This thesis discusses the physical and chemical processes than influence the composition of forming planets.
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Sizing up protoplanetary disks
PhD Defence
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From molecules to planets: Exploring the chemical heritage of solar systems
Walsh
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Unveiling protostellar disk formation around low-mass stars
Promotor: Prof.dr. E.F. van Dishoeck, Co-promotor: S. Bruderer
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Imaging polarimetry for the characterisation of exoplanets and protoplanetary discs. Scientific and technical challenges
Promotor: C.U. Keller, Co-Promotor: F. Snik
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High-Contrast Imaging of Protoplanetary Disks
PhD Defence
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The puzzle of protoplanetary disk masses
PhD Defence
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From midplane to planets : the chemical fingerprint of a disk
This thesis addresses the chemical processes that determine the compositions of giant planet atmospheres.
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High-contrast imaging polarimetry of exoplanets and circumstellar disks
Understanding the formation and evolution of planetary systems is one of the most fundamental challenges in astronomy. To directly image and study young exoplanets and the circumstellar disks they form from, dedicated high-contrast imaging instruments are built.
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Research Projects, Categories and Supervisors
These are the proposed research projects for LEAPS 2019. Please note that not all projects will go ahead and some may still be added in the near future. Final funding decisions lie with the Faculty sponsors. And please make a note that if you are interested in an ESA project, to check if your state…
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Astronomers see star with dust disk that is still being fed
An international team of astronomers including Leiden scientists publishes the image of a young star with a surrounding dust disk that is still being fed from its surroundings. The phenomenon around the star SU Aur may explain why so many exoplanets are not neatly aligned with their star. The European…
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The Demographics of Protoplanetary Disks: from Lupus to Orion
PhD Defence
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Small scale kinematics of massive star-forming cores
Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: M.R. Hogerheijde
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Astronomer Jos de Boer receives Chesneau Prize for best dissertation
Astronomer Jos de Boer has received the Chesneau Prize in Nice for his research into so-called protoplanetary disks. The prize is awarded to the best astronomical dissertation in the field of high angular resolution. 'I consider it a good opportunity to talk about my research.'
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Protoplanetary Disk Anatomy: examining the structure and chemistry of planetary birthplaces with simple molecules
PhD Defence
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Not so smooth after all: resolving dust and gas structures in protoplanetary disks
PhD Defence
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Painting with starlight : optical techniques for the high-contrast imaging of exoplanets
This thesis describes the development and validation of new high-contrast imaging techniques, with the ultimate goal of enabling the next generation of instruments for ELT-class telescopes to directly image Earth-like extra-solar planets orbiting around nearby stars.
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Planet formation starts before a star is fully grown
A team of European astronomers under Leiden leadership has discovered that dust particles around a star already coagulate before the star is fully grown. These agglomerated dust particles are the first step in the formation of planets. The research publish their discovery in the journal of Nature As…
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All comets in our solar system might come from the same place
All comets might share their place of birth, new research says. For the first time ever, astronomer Christian Eistrup applied chemical models to fourteen well-known comets, surprisingly finding a clear pattern. His publication has been accepted in the journal Astronomy & Astrophysics.
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Mysterious ripples racing through planet-forming disk
An international team of astronomers, including Leiden’s Christian Ginski, has discovered previously unobserved structures in a debris disk around a nearby star. Article published in Nature on 8 October.
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First discovery of methanol in a warm planet-forming disk
An international team of researchers led by Alice Booth (Leiden University, the Netherlands) have discovered methanol in the warm part of a planet-forming disk. The methanol cannot have been produced there and must have originated in the cold gas clouds from which the star and the disk formed. Thus,…
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Dynamics and radiation from tidal disruption events
When a star gets too close to a supermassive black hole, it is torn apart by strong tidal forces in a tidal disruption event (TDE).
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Imaging the water snow line within a protoplanetary disc
Research using the ALMA telescope by scientists including Leiden's John Tobin and Steven Bos has produced the first images of the water snow line within a protoplanetary disc. Publication in Nature on 14 July.
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Astronomers see disk around young super-Jupiter which may form moons
An international team of astronomers led by scientists from Leiden Observatory has for the first time characterised a dust disk surrounding a young super-Jupiter, which is either a giant planet or brown dwarf. They detected infrared emission from the disk which might indicate that moons may have formed.…
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Multiple star formation: chemistry, physics and coevality
Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.
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High-mass stars are formed not from dust disk but from debris
A Dutch-led team of astronomers has discovered that high-mass stars are formed differently from their smaller siblings. Whereas small stars are often surrounded by an orderly disk of dust and matter, the supply of matter to large stars is a chaotic mess. The researchers used the Atacama Large Millimeter/submillimeter…
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Tracing space ice and the building blocks of life
An unprecedented space telescope, an astrolab that makes space ice and molecules that may lead to the origin of life… The Ice Age project has all the prerequisites to become a very fascinating research project – if it is not one already. Leiden astronomers Melissa McClure, Harold Linnartz and Will Rocha…
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Extrasolar Planet Detection Through Spatially Resolved Observations
Promotor: Prof. dr. I. Snellen, Co-Promotor: Dr. M. Kenworthy
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The electrode-electrolyte interface in CO2 reduction and H2 evolution: a multiscale approach
Electrocatalysis allows for storing electricity or converting it into chemical bonds, producing chemical building blocks and fuels using renewable resources.
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Ewine van Dishoeck receives american prize for leading role in astrochemistry
The Dutch scientist prof. dr. Ewine F. van Dishoeck, Leiden Observatory, Leiden University and Max Planck Institute for Extraterrestrial Physics, will receive the 2018 James Craig Watson Medal from the american National Academy of Sciences (NAS).
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X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy
In this thesis, we present new laboratory data of interstellar dust analogues.
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Table salt discovered around a young star
New ALMA observations show there is ordinary table salt in a not-so-ordinary location: 1,500 light-years from Earth in the disk surrounding a massive young star. Though salts have been found in the atmospheres of old, dying stars, this is the first time they have been seen around young stars in stellar…
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Astronomers see two planets vacuuming around young star
Astronomers led by Leiden astronomer Sebastiaan Haffert have directly imaged two planets that are gravitationally carving out a wide gap within a planet-forming disk surrounding a young star. While over a dozen exoplanets have been directly imaged, this is only the second multi-planet system to be p…
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Planet formation: food for thought
Planet formation is a surprisingly homogeneous process that does not take place gradually from inside out, but that occurs everywhere at the same time in a proto-planetary disc, as Dave Lommen has discovered. He will obtain his doctorate this week based on his research into the dust around young stars…