A5077211061- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Geology and Paleoclimatology Research
- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Astronomical Observations and Instrumentation
International Space Science Institute
2022-2024
University of Bern
2022-2024
Lund University
2020
Abstract NASA’s Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test kinetic impactor technology for deflecting potentially hazardous object in space. The experiment resulted small change to dynamical state Didymos system consistent with expectations and Level 1 mission requirements. In preencounter paper, predictions were put forward regarding pre- postimpact system. Here we assess...
We propose a pebble-driven planet formation scenario to form giant planets with high multiplicity and large orbital distances in the early gas disk phase. perform N-body simulations investigate growth migration of low-mass protoplanets inner viscously heated outer stellar irradiated regions. The key feature this model is that cores grow rapidly by combination pebble accretion planet-planet collisions. This consequently speeds up their accretion. Because efficient growth, transitions from...
Binary asteroid formation is a highly complex process, which has been highlighted with recent observations of satellites unexpected shapes, such as the oblate Dimorphos by NASA DART mission and contact binary Selam NASA's Lucy mission. There no clear consensus on dynamical mechanisms determine final shape these objects. In turn, we explore pathway where spin-up rotational failure rubble pile lead to mass-shedding wide circumasteroidal debris disk in satellite forms. Using combination...
Using a penalised maximum likelihood we estimate, for the first time, velocity distribution of white dwarfs in Solar neighbourhood. Our sample consists 129 675 within 500 pc Gaia Early Data Release 3 The dwarf distributions reveal similar structure to rest neighbourhood stars, reflecting that are subjected same dynamical processes. In three magnitude-binned subsamples however find novel at $(U, V) = (7, -19)$ km s$^{-1}$ fainter samples, potentially related Coma Berenices stream. We also see...
Recent observations of asteroid satellites with unexpected shapes, such as the spherically oblate Dimorphos observed by NASA’s DART mission [1] or bilobate contact binary satellite Selam imaged Lucy spacecraft [2], have highlighted complexity formation. Previous theories focused on long-term spin-up rubble pile asteroids leading to slow, continuous mass-shedding [3] rotational fission [4] can account for predominantly prolate population given their shape due tidal forces, keeping...