333 citations · 1.7k across the 28 of their papers we have counts for
28 papers
Constraints on the ejecting-crust activity model on comet 67P/Churyumov-Gerasimenko
Nicholas Attree, Pedro Gutiérrez, Christian Schuckart +6
Reproducing the observed activity of comets with thermophysical models remains a primary challenge of cometary science. We use a pebble-based thermophysical model of gas-pressure b…
Localised ejection of dust and chunks on comet 67P/Churyumov-Gerasimenko: testing how comets work
Nicholas Attree, Christian Schuckart, Dorothea Bischoff +2
We extend an existing thermophysical activity model of comet 67P/Churyumov-Gerasimenko to include pressure buildup inside the pebbles making up the nucleus. We test various quantit…
Laboratory Experiments to Understand Comets
Olivier Poch, Antoine Pommerol, Nicolas Fray +1
In order to understand the origin and evolution of comets, one must decipher the processes that formed and processed cometary ice and dust. Cometary materials have diverse physical…
Simulation and experiment of gas diffusion in a granular bed
Carsten Güttler, Martin Rose, Holger Sierks +6
The diffusion of gas through porous material is important to understand the physical processes underlying cometary activity. We study the diffusion of a rarefied gas (Knudsen regim…
A quantitative description of comet 67P's dust and gas production remains enigmatic
Dorothea Bischoff, Christian Schuckart, Nicholas Attree +2
The mechanism of dust emission from a cometary nucleus is still an open question and thermophysical models have problems reproducing outgassing and dust productions rates simultane…
Sub-mm/mm optical properties of real protoplanetary matter derived from Rosetta/MIRO observations of comet 67P
Johanna Bürger, Thilo Glißmann, Anthony Lethuillier +6
Optical properties are required for the correct understanding and modelling of protoplanetary and debris discs. By assuming that comets are the most pristine bodies in the solar sy…
Formation of Comets
Jürgen Blum, Dorothea Bischoff, Bastian Gundlach
Questions regarding how primordial or pristine the comets of the solar system are have been an ongoing controversy. In this review, we describe comets' physical evolution from dust…
Are there any pristine comets? Constraints from pebble structure
Uri Malamud, Wolf A. Landeck, Dorothea Bischoff +4
We show that if comets (or any small icy planetesimals such as Kuiper belt objects) are composed of pebble piles, their internal radiogenic as well as geochemical heating results i…
Cometary dust analogues for physics experiments
A. Lethuillier, C. Feller, E. Kaufmann +23
The CoPhyLab (Cometary Physics Laboratory) project is designed to study the physics of comets through a series of earth-based experiments. For these experiments, a dust analogue wa…
A method to distinguish between micro- and macro-granular surfaces of small Solar System bodies
D. Bischoff, B. Gundlach, J. Blum
The surface granularity of small Solar System bodies is diverse through the different types of planetary bodies and even for specific objects it is often not known in detail. One o…
Sticky or not sticky? Measurements of the tensile strength of micro-granular organic materials
Dorothea Bischoff, Christopher Kreuzig, David Haack +2
Knowledge of the mechanical properties of protoplanetary and cometary matter is of key importance to better understand the activity of comets and the early stages of planet formati…
The footprint of cometary dust analogues: II. Morphology as a tracer of tensile strength and application to dust collection by the Rosetta spacecraft
L. E. Ellerbroek, B. Gundlach, A. Landeck +6
The structure of cometary dust is a tracer of growth processes in the formation of planetesimals. Instrumentation on board the Rosetta mission to comet 67P/Churyumov- Gerasimenko c…
Experiments on cometary activity: ejection of dust aggregates from a sublimating water-ice surface
D. Bischoff, B. Gundlach, M. Neuhaus +1
The gas-driven dust activity of comets is still an unresolved question in cometary science. In the past, it was believed that comets are dirty snowballs and that the dust is ejecte…
Asteroid Ryugu Before the Hayabusa2 Encounter
Koji Wada, Matthias Grott, Patrick Michel +31
Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA). Ground-based observat…
Evidence for the formation of comet 67P/Churyumov-Gerasimenko through gravitational collapse of a bound clump of pebbles
Jürgen Blum, Bastian Gundlach, Maya Krause +19
The processes that led to the formation of the planetary bodies in the Solar System are still not fully understood. Using the results obtained with the comprehensive suite of instr…
Micrometer-Sized Water Ice Particles for Planetary Science Experiments: Influence of Surface Structure on Collisional Properties
Sabrina Gärtner, Bastian Gundlach, Thomas F. Headen +7
Models and observations suggest that ice-particle aggregation at and beyond the snowline dominates the earliest stages of planet-formation, which therefore is subject to many labor…
The footprint of cometary dust analogs: I. Laboratory experiments of low-velocity impacts and comparison with Rosetta data
L. E. Ellerbroek, B. Gundlach, A. Landeck +8
Cometary dust provides a unique window on dust growth mechanisms during the onset of planet formation. Measurements by the Rosetta spacecraft show that the dust in the coma of come…
Why are Jupiter-family comets active and asteroids in cometary-like orbits inactive?
B. Gundlach, J. Blum
Context: Surveys in the visible and near-infrared spectral range have revealed the presence of low-albedo asteroids in cometary like orbits (ACOs). In contrast to Jupiter family co…
Comet formation in collapsing pebble clouds. What cometary bulk density implies for the cloud mass and dust-to-ice ratio
S. Lorek, B. Gundlach, P. Lacerda +1
Comets are remnants of the icy planetesimals that formed beyond the ice line in the Solar Nebula. Growing from micrometre-sized dust and ice particles to km-sized objects is, howev…
What drives the dust activity of comet 67P/Churyumov-Gerasimenko?
B. Gundlach, J. Blum, H. U. Keller +1
We use the gravitational instability formation scenario of cometesimals to derive the aggregate size that can be released by the gas pressure from the nucleus of comet 67P/Churyumo…
The stickiness of micrometer-sized water-ice particles
B. Gundlach, J. Blum
Water ice is one of the most abundant materials in dense molecular clouds and in the outer reaches of protoplanetary disks. In contrast to other materials (e.g., silicates) water i…
Comets formed in solar-nebula instabilities! -- An experimental and modeling attempt to relate the activity of comets to their formation process (corrigendum included)
Jürgen Blum, Bastian Gundlach, Steffen Mühle +1
When comet nuclei approach the Sun, the increasing energy flux through the surface layers leads to sublimation of the underlying ices and subsequent outgassing that promotes the ob…
Thermophysical properties of near-Earth asteroid (341843) 2008 EV5 from WISE data
V. Alí-Lagoa, L. Lionni, M. Delbo +3
Aims. To derive the thermal inertia of 2008 EV, the baseline target for the Marco Polo-R mission proposal, and infer information about the size of the particles on its surface.…
A new method to determine the grain size of planetary regolith
Bastian Gundlach, Jürgen Blum
Airless planetary bodies are covered by a dusty layer called regolith. The grain size of the regolith determines the temperature and the mechanical strength of the surface layers.…