A5087674032- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Space Science and Extraterrestrial Life
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- earthquake and tectonic studies
- Stellar, planetary, and galactic studies
- Paleontology and Stratigraphy of Fossils
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Space exploration and regulation
- Marine and environmental studies
- Spaceflight effects on biology
- Spacecraft Design and Technology
- Gas Dynamics and Kinetic Theory
- Reservoir Engineering and Simulation Methods
- CO2 Sequestration and Geologic Interactions
- Seismic Waves and Analysis
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2016-2025
Planet
2013-2024
Planetary Science Institute
2021-2024
Institut für Lungenforschung
2016-2024
Arizona State University
2022
Imperial College London
2022
Dienstleistungszentrum Ländlicher Raum
2021
University of Münster
2012-2020
Clues to a planet's geologic history are contained in its interior structure, particularly core. We detected reflections of seismic waves from the core-mantle boundary Mars using InSight data and inverted these together with geodetic constrain radius liquid metal core 1830 ± 40 kilometers. The large implies martian mantle mineralogically similar terrestrial upper transition zone but differing Earth by not having bridgmanite-dominated lower mantle. inferred mean density 5.7 6.3 grams per...
Single seismometer structure Because of the lack direct seismic observations, interior Mars has been a mystery. Khan et al. , Knapmeyer-Endrun and Stähler used recently detected marsquakes from deployed during InSight mission to map (see Perspective by Cottaar Koelemeijer). likely 24- 72-kilometer-thick crust with very deep lithosphere close 500 kilometers. Similar Earth, low-velocity layer probably exists beneath lithosphere. The is highly enriched in radioactive elements that help heat...
Abstract Analyses of seismic data from the InSight mission have provided first in situ constraints on thickness crust Mars. These crustal are currently limited to beneath lander that is located northern lowlands, and we use gravity topography construct global models satisfy data. consider a range possible mantle core density profiles, densities, low‐density surface layer, possibility lowlands greater than southern highlands. Using preferred three‐layer model crust, average planet found lie...
The Heat Flow and Physical Properties Package HP3 for the InSight mission will attempt first measurement of planetary heat flow Mars. data be taken at landing site in Elysium planitia (136 ∘E, 5 ∘N) uncertainty aimed shall better than ±5 mW m−2. package consists a mechanical hammering device called "Mole" penetrating into regolith, an instrumented tether which Mole pulls ground, fixed radiometer to determine surface brightness temperature electronic box. are housed support structure before...
A number of observations performed by the MESSENGER spacecraft can now be employed to better understand evolution Mercury's interior. Using recent constraints on interior structure, surface composition, volcanic and tectonic histories, we modeled thermal magmatic planet. We ran a large set Monte Carlo simulations based one‐dimensional parametrized models, spanning wide range parameters. complemented these with selected calculations in 2‐D cylindrical 3‐D spherical geometry, which confirmed...
Abstract We invert the Martian tidal response and mean mass moment of inertia for chemical composition, thermal state, interior structure. The inversion combines phase equilibrium computations with a laboratory‐based viscoelastic dissipation model. rheological model, which is based on measurements anhydrous melt‐free olivine, both temperature grain size sensitive imposes strong constraints bottom lithosphere, defined as location where conductive geotherm meets mantle adiabat, occurs deep...
Abstract The energy sources involved in the early stages of formation terrestrial bodies can induce partial or even complete melting mantle, leading to emergence magma oceans. fractional crystallization a ocean cause compositional layering that play fundamental role for subsequent long‐term dynamics interior and evolution geochemical reservoirs. In order assess what extent primordial heterogeneities generated by solidification be preserved, we investigate whole‐mantle Martian ocean,...
Plate tectonics is a fundamental component for the habitability of Earth. Yet whether it recurrent feature terrestrial bodies orbiting other stars or unique to Earth unknown. The stagnant lid may rather be most common tectonic expression on such bodies. To understand stagnant-lid planet can habitable, i.e. host liquid water at its surface, we model thermal evolution mantle, volcanic outgassing H$_2$O and CO$_2$, resulting climate an Earth-like lacking plate tectonics. We used 1D...
The first in situ Martian heat flux measurement to be carried out by the InSight Discovery-class mission will provide an important baseline constrain present-day budget of planet and, turn, thermochemical evolution its interior. In this study, we estimate magnitude surface heterogeneities order assess how at landing site relates average Mars. To end, model thermal Mars a 3-D spherical geometry and investigate resulting spatial variations present day. Our models assume fixed crust with...
Abstract The present‐day thermal state, interior structure, composition, and rheology of Mars can be constrained by comparing the results history calculations with geophysical, petrological, geological observations. Using largest‐to‐date set 3‐D evolution models, we find that a limited models satisfy all available constraints simultaneously. These require core radius strictly larger than 1,800 km, crust an average thickness between 48.8 87.1 km containing more half planet's bulk abundance...
We detected surface waves from two meteorite impacts on Mars. By measuring group velocity dispersion along the impact-lander path, we obtained a direct constraint crustal structure away InSight lander. The crust north of equatorial dichotomy had shear wave approximately 3.2 kilometers per second in 5- to 30-kilometer depth range, with little variation. This implies higher density than inferred beneath lander, suggesting either compositional differences or reduced porosity volcanic areas...
Abstract This work reviews the long-term evolution of atmosphere Venus, and modulation its composition by interior/exterior cycling. The formation Venus’s atmosphere, leading to contemporary surface conditions, remain hotly debated topics, involve questions that tie into many disciplines. We explore these various inter-related mechanisms which shaped starting with volatile sources sinks. Going from deep interior top we describe volcanic outgassing, surface-atmosphere interactions, escape....
We present the first observations of seismic waves propagating through core Mars. These observations, made using data collected by InSight geophysical mission, have allowed us to construct seismically constrained models for elastic properties Mars' core. observe core-transiting phase SKS from two farside events detected on Mars and measure travel times relative mantle traversing body waves. travels as a compressional wave, providing information about bulk modulus density. perform...
Abstract The dynamics and evolution of Venus’ mantle are first-order relevance for the origin modification tectonic volcanic structures we observe on Venus today. Solid-state convection in induces stresses into lithosphere crust that drive deformation leading to signatures. Thermal coupling with atmosphere core leads a distinct structure substantial lateral heterogeneity, thermally compositionally. These processes ultimately shape regime provide framework interpret surface observations made...
Abstract Surface geologic features form a detailed record of Venus’ evolution. Venus displays profusion volcanic and tectonics features, including both familiar exotic forms. One challenge to assessing the role these in evolution is that there are too few impact craters permit age dates for specific or regions. Similarly, without surface water, erosion limited cannot be used evaluate age. These same observations indicate has, on average, very young (150–1000 Ma), with most recent deformation...
Since the very first observations of Moon, radars have been more and employed as payloads planetary exploration missions, in various operational modes like altimeters, SARs or radar sounders. Especially sounders provide unique measurement capabilities for subsurface bodies, demonstrated by MARSIS SHARAD instruments planned REASON [1] RIME [2] Europa Clipper Juice aimed on Jupiter’s icy moons. Radar are nadir-looking sensors that transmit pulsed electromagnetic radiation propagates...
Constraining the thermal and compositional state of mantle is crucial for deciphering formation evolution Mars. Mineral physics predicts that Mars’ deep demarcated by a seismic discontinuity arising from pressure-induced phase transformation mineral olivine to its higher-pressure polymorphs, making depth this boundary sensitive both temperature composition. Here, we report on detection midmantle using data collected NASA’s InSight Mission Mars matches expected sharpness postolivine...
Abstract We report observations of Rayleigh waves that orbit around Mars up to three times following the S1222a marsquake. Averaging these signals, we find largest amplitude signals at 30 and 85 s central period, propagating with distinctly different group velocities 2.9 3.8 km/s, respectively. The constraining average crustal thickness beneath great circle path rule out majority previous models have a >200 kg/m 3 density contrast across equatorial dichotomy between northern lowlands...
The upcoming InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission, to be launched in 2016, will carry out the first situ Martian heat flux measurement, thereby providing an important baseline constrain present-day budget of planet and, turn, thermal chemical evolution its interior. surface can used amount heat-producing elements present interior if Urey ratio (Ur)—the planet's production rate divided by loss—is known. We numerical simulations mantle...