Zobrazeno 1 - 10
of 166
pro vyhledávání: '"Teiser, Jens"'
Planetesimals or smaller bodies in protoplanetary disks are often considered to form as pebble piles in current planet formation models. They are supposed to be large but loose, weakly bound clusters of more robust dust aggregates. This makes them ea
Externí odkaz:
http://arxiv.org/abs/2403.15225
Ionization is important for magnetohydrodynamics and chemistry in protoplanetary disks but known ionization sources are often weak along the midplane. We present, for the first time, data from a laboratory experiment, where we measure ions from colli
Externí odkaz:
http://arxiv.org/abs/2402.01405
Autor:
Becker, Tim, Teiser, Jens, Jardiel, Teresa, Peiteado, Marco, Muñoz, Olga, Martikainen, Julia, Martin, Juan Carlos Gomez, Merrison, Jonathan, Wurm, Gerhard
Publikováno v:
Planet. Sci. J. 4 180 (2023)
Our earlier laboratory measurements showed that low-velocity sand impacts release fine <5 {\mu}m dust from a Martian simulant soil. This dust will become airborne in the Martian atmosphere. Here, we extend this study by measuring aerodynamic properti
Externí odkaz:
http://arxiv.org/abs/2310.09133
Autor:
Schönau, Laurent, Teiser, Jens, Demirci, Tunahan, Joeris, Kolja, Bila, Tetyana, Onyeagusi, F. Chioma, Fritscher, Miriam, Wurm, Gerhard
Publikováno v:
A6A 672, A169 (2023)
Planetesimals are born fragile and are subject to destruction by wind erosion as they move through the gas of a protoplanetary disk. In microgravity experiments, we determined the shear stress necessary for erosion of a surface consisting of 1 mm dus
Externí odkaz:
http://arxiv.org/abs/2305.03562
Publikováno v:
Planet. Sci. J. 4 16 (2023)
At low ambient pressure, temperature gradients in porous soil lead to a gas flow, called thermal creep. With this regard, Mars is a unique as the conditions for thermal creep to occur in natural soil only exist on this planet in the solar system. Kno
Externí odkaz:
http://arxiv.org/abs/2302.06882
Autor:
Wurm, Gerhard, Teiser, Jens
Publikováno v:
Nature Reviews Physics, 3, 405-421, 2021
In 2018, images were released of a planet being formed around the star PDS 70, offering a tantalizing glimpse into how planets come into being. However, many questions remain about how dust evolves into planets, and astrophysical observations are una
Externí odkaz:
http://arxiv.org/abs/2302.07156
Publikováno v:
F. Chioma Onyeagusi et al 2023 Planet. Sci. J. 4 13
Surfaces of planetary bodies can have strong electric fields, subjecting conductive grains to repulsive electrostatic forces. This has been proposed as mechanism to eject grains from the ground. To quantify this process, we study mm-sized basalt aggr
Externí odkaz:
http://arxiv.org/abs/2301.11609
Autor:
Becker, Tim, Teiser, Jens, Jardiel, Teresa, Peiteado, Marco, Munoz, Olga, Martikainen, Julia, Martin, Juan Carlos Gomez, Wurm, Gerhard
Publikováno v:
Planet. Sci. J. 3 195 (2022)
Emission of dust up to a few micrometer in size by impacts of sand grains during saltation is thought to be one source of dust within the Martian atmosphere. To study this dust fraction, we carried out laboratory impact experiments. Small numbers of
Externí odkaz:
http://arxiv.org/abs/2208.14761
We introduce collisions of solids as a new and efficient ionization mechanism for gas in protoplanetary disks, which especially operates in the dense midplane of protoplanetary disks. This idea is sparked by laboratory experiments where we found that
Externí odkaz:
http://arxiv.org/abs/2207.07551
Publikováno v:
Journal of Electrostatics 115 (2022) 103637
We present a method for measurements of electric dipole moments on (sub)-mm size (basalt) particles levitated in an acoustic trap and centered within a plate capacitor. If an electric field is applied the particles oscillate with specific frequencies
Externí odkaz:
http://arxiv.org/abs/2202.01979