C. Güttler
A5028829283- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical and nuclear sciences
- Geology and Paleoclimatology Research
- Nuclear Physics and Applications
- Spacecraft and Cryogenic Technologies
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Granular flow and fluidized beds
- Particle Dynamics in Fluid Flows
- Atmospheric Ozone and Climate
- Space Exploration and Technology
- Radioactive Decay and Measurement Techniques
- Sports Dynamics and Biomechanics
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics Simulations and Interactions
- Aeolian processes and effects
- High-Velocity Impact and Material Behavior
- Gamma-ray bursts and supernovae
- Radioactivity and Radon Measurements
- Laser-induced spectroscopy and plasma
Max Planck Institute for Solar System Research
2015-2024
University of Münster
2024
Max Planck Institute of Experimental Medicine
2022
Institute for Space Astrophysics and Planetology
2021
Osservatorio Astronomico di Padova
2018
Max Planck Society
2015-2018
Technische Universität Braunschweig
2007-2017
Jet Propulsion Laboratory
2017
University of Bern
2016
John Wiley & Sons (United States)
2015
The sticking of micron sized dust particles due to surface forces in circumstellar disks is the first stage production asteroids and planets. key ingredients that drive this process are relative velocity between environment complex physics aggregate collisions. Here we present results a collision model, which based on laboratory experiments these aggregates. We investigate maximum size mass can be reached by coagulation protoplanetary disks. model growth aggregates at 1 AU midplane three...
The growth processes from protoplanetary dust to planetesimals are not fully understood. Laboratory experiments and theoretical models have shown that collisions among the aggregates can lead sticking, bouncing, fragmentation. However, no systematic study on collisional outcome of has been performed so far a physical model evolution in disks is still missing. We intend map parameter space for interaction arbitrarily porous aggregates. This encompasses dust-aggregate masses, their porosities...
Images from the OSIRIS scientific imaging system onboard Rosetta show that nucleus of 67P/Churyumov-Gerasimenko consists two lobes connected by a short neck. The has bulk density less than half water. Activity at distance Sun >3 astronomical units is predominantly neck, where jets have been seen consistently. rotates about principal axis momentum. surface morphology suggests removal larger volumes material, possibly via explosive release subsurface pressure or creation overhangs sublimation,...
Critical measurements for understanding accretion and the dust/gas ratio in solar nebula, where planets were forming 4.5 billion years ago, are being obtained by GIADA (Grain Impact Analyser Dust Accumulator) experiment on European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 3.4 astronomical units inbound, OSIRIS (Optical, Spectroscopic, Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, 48 10(-5)...
Images of comet 67P/Churyumov-Gerasimenko acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) imaging system onboard European Space Agency’s Rosetta spacecraft at scales better than 0.8 meter per pixel show a wide variety different structures textures. The data importance airfall, surface dust transport, mass wasting, insolation weathering for cometary evolution, they offer some support subsurface fluidization models loss through ejection large chunks material.
The Philae lander, part of the Rosetta mission to investigate comet 67P/Churyumov-Gerasimenko, was delivered cometary surface in November 2014. Here we report precise circumstances multiple landings Philae, including bouncing trajectory and rebound parameters, based on engineering data conjunction with operational instrument data. These also provide information mechanical properties (strength layering) surface. first touchdown site, Agilkia, appears have a granular soft (with compressive...
We analyzed more than 200 OSIRIS NAC images with a pixel scale of 0.9−2.4 m/pixel comet 67P/Churyumov-Gerasimenko (67P) that have been acquired from onboard the Rosetta spacecraft in August and September 2014 using stereo-photogrammetric methods (SPG). derived improved position pointing data for high-resolution shape model consists about 16 million facets (2 m horizontal sampling) typical vertical accuracy at decimeter scale. From this model, we derive volume northern hemisphere 9.35 km3 ±...
Context. The complex shape of comet 67P and its oblique rotation axis cause pronounced seasonal effects. Irradiation hence activity vary strongly.
Context. We investigate the formation and evolution of comet nuclei other trans-Neptunian objects (TNOs) in solar nebula primordial disk prior to giant planet orbit instability foreseen by Nice model.
ABSTRACT The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10 −10 kg by means the GIADA collector and OSIRIS Wide Angle Camera Narrow since 2014 August will continue until 2016 September. Detections single allow us to estimate anisotropic flux from 67P, infer loss rate size distribution at surface sunlit nucleus, see whether 67P evolves in time. velocity orbiter, relative is much lower measured GIADA,...
The formation of planetesimals is often accredited to collisional sticking dust grains. exact process unknown, as collisions between larger aggregates tend lead fragmentation or bouncing rather than sticking. Recent laboratory experiments have however made great progress in the understanding and mapping complex physics involved collisions. We want study possibility planetesimal using results from latest experiments, particularly by including with mass transfer effect, which might growth even...
Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These have yielded unprecedented insight into morphological diversity comet's surface. This paper presents an overview regional morphology 67P.
Context. We present an investigation of the surface properties areas on nucleus comet 67P/Churyumov-Gerasimenko.
Context. The Rosetta mission of the European Space Agency has been orbiting comet 67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escort phase. A large complement scientific experiments designed to complete most detailed study a ever attempted are onboard Rosetta.
We study the link between gravitational slopes and surface morphology on nucleus of comet 67P/Churyumov-Gerasimenko provide constraints mechanical properties cometary material. computed for five regions that are representative different morphologies observed surface, using two shape models from OSIRIS images by stereo-photoclinometry (SPC) stereo-photogrammetry (SPG) techniques. estimated tensile, shear, compressive strengths considerations. The show a similar general pattern in terms...
To study the evolution of protoplanetary dust aggregates, we performed experiments with up to 2600 collisions between single, highly-porous aggregates and a solid plate. The consisted spherical SiO$_2$ grains 1.5$\mu$m diameter had an initial volume filling factor (the fraction material) $\phi_0=0.15$. were put onto vibrating baseplate and, thus, multiple plate at mean velocity 0.2 m s$^{-1}$. observed by high-speed camera measure their size which apparently decreased over time as for...
We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images comet 67P/Churyumov-Gerasimenko (67P). The with pixel scales in the range 0.2−3.0 m/pixel were acquired between August 2014 and February 2016. finally derived global high-resolution 3D description 67P's surface, SPG SHAP7 shape model. It consists about 44 million facets (1−1.5 m horizontal sampling) typical vertical accuracy at decimeter scale. Although some taken after perihelion, model can be...
During its 2 yr mission around comet 67P/Churyumov–Gerasimenko, ESA's Rosetta spacecraft had the unique opportunity to follow closely a in most active part of orbit. Many studies have presented typical features associated with activity nucleus, such as localized dust and gas jets. Here, we report on series more energetic transient events observed during 3 months surrounding comet's perihelion passage 2015 August. We detected characterized 34 outbursts cameras, one every 2.4 nucleus...
Before Rosetta, the space missions Giotto and Stardust shaped our view on cometary dust, supported by plentiful data from Earth based observations interplanetary dust particles collected in Earth’s atmosphere. The Rosetta mission at comet 67P/Churyumov-Gerasimenko was equipped with a multitude of instruments designed to study dust. While an abundant amount presented several individual papers, many focused dedicated measurement or topic. Different instruments, methods, sources provide...
Aims.We derive for the first time size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from images taken by Rosetta/OSIRIS imaging system.We highlight possible physical processes that lead to these boulder size distributions.Methods.We used acquired OSIRIS Narrow Angle Camera, NAC, 5 and 6 August 2014.The scale (2.44-2.03m/px) is such ≥7 m can be identified manually extracted datasets with software ArcGIS.We derived both global localized...