Zobrazeno 1 - 10
of 12 202
pro vyhledávání: '"Nordlund, A"'
Thousands of planetesimals: Simulating the streaming Instability in very large computational domains
The streaming instability is a mechanism whereby pebble-sized particles in protoplanetary discs spontaneously come together in dense filaments, which collapse gravitationally to form planetesimals upon reaching the Roche density. The extent of the fi
Externí odkaz:
http://arxiv.org/abs/2410.08347
Refractory high-entropy alloys show promising resistance to irradiation, yet little is known about the fundamental nature of radiation-induced defect formation. Here, we simulate threshold displacement energies in equiatomic MoNbTaVW using an accurat
Externí odkaz:
http://arxiv.org/abs/2409.08030
Context. Simulating solar flares, which involve large-scale dynamics and small-scale magnetic reconnection, poses significant computational challenges. Aims. This study aims to develop an explicit Particle-In-Cell (PIC) solver within the DISPATCH fra
Externí odkaz:
http://arxiv.org/abs/2409.02493
Machine learning (ML) has become widely used in the development of interatomic potentials for molecular dynamics simulations. However, most ML potentials are still much slower than classical interatomic potentials and are usually trained with near eq
Externí odkaz:
http://arxiv.org/abs/2408.15779
Autor:
Nordlund, Kai, Kong, Fanhao, Djurabekova, Flyura, Heikinheimo, Matti, Tuominen, Kimmo, Mirabolfathi, Nader
When the detection threshold in semiconductor detectors is pushed to increasingly low energies, an ``excess" signal of apparent energy release events below a few hundred eV is observed in several different kinds of detectors, hindering their sensitiv
Externí odkaz:
http://arxiv.org/abs/2408.07518
Autor:
Jørgensen, Uffe G., Amadio, Flavia, Estrada, Beatriz Campos, Møller, Kristian Holten, Schneider, Aaron D., Balduin, Thorsten, D'Alessandro, Azzurra, Symeonidou, Eftychia, Helling, Christiane, Nordlund, Åke, Woitke, Peter
Publikováno v:
A&A 690, A127 (2024)
Computation of a grid of self consistent 1D model atmospheres of cool stars, sub-stellar objects and exoplanets in the effective temperature range 300K to 3000K, including cloud formation, chemical non-equilibrium effects, and stellar irradiation. Th
Externí odkaz:
http://arxiv.org/abs/2407.09397
Protoplanetary disks are routinely described as finite mass reservoirs left over by the gravitational collapse of the protostar, an assumption that strongly constrains both disk evolution and planet formation models. We propose a different scenario w
Externí odkaz:
http://arxiv.org/abs/2405.07334
Context. While Class II stars have already accreted most of their mass, the continued inflow of fresh material via Bondi-Hoyle accretion acts as an additional mass reservoir for their circumstellar disks. This may explain the observed accretion rates
Externí odkaz:
http://arxiv.org/abs/2405.06520
Autor:
Eitner, Philipp, Bergemann, Maria, Hoppe, Richard, Nordlund, Åke, Plez, Bertrand, Klevas, Jonas
Large-scale stellar surveys, such as SDSS-V, 4MOST, WEAVE, and PLATO, require accurate atmospheric models and synthetic spectra of stars for accurate analyses of fundamental stellar parameters and chemical abundances. The primary goal of our work is
Externí odkaz:
http://arxiv.org/abs/2405.06338
We describe the Stagger Code for simulations of magneto-hydrodynamic (MHD) systems. This is a modular code with a variety of physics modules that will let the user run simulations of deep stellar atmospheres, sunspot formation, stellar chromospheres
Externí odkaz:
http://arxiv.org/abs/2405.02483