Results 101 to 110 of about 37,732 (195)

Adsorption of Volatiles on Dust Grains in Protoplanetary Disks

The Astrophysical Journal
The adsorption of volatile molecules onto dust grain surfaces fundamentally influences dust-related processes, including condensation of gas-phase molecules, dust coagulation, and planet formation in protoplanetary disks. Using advanced ab initio density
Lile Wang, Feng Long, Haifeng Yang, Ruobing Dong, Shenzhen Xu   +4 more
doaj   +1 more source

Size distribution of dust grains: A problem of self-similarity [PDF]

Distribution functions describing the results of natural processes frequently show the shape of power laws, e.g., mass functions of stars and molecular clouds, velocity spectrum of turbulence, size distributions of asteroids, micrometeorites and also ...
Dorschner, J., Guertler, J., Henning, TH.   +2 more
core   +1 more source

Methane Formation Efficiency on Icy Grains: Role of Adsorption States

The Astrophysical Journal
Methane (CH _4 ) is one of the major components of the icy mantle of cosmic dust prevalent in cold, dense regions of interstellar media, playing an important role in the synthesis of complex organic molecules and prebiotic molecules.
Masashi Tsuge, Germán Molpeceres, Yuri Aikawa, Naoki Watanabe   +3 more
doaj   +1 more source

Magnetically Aligned Grains as a Ubiquitous Source of Spin-polarized Electrons and Chiral-symmetry-breaking Agents

The Astrophysical Journal
The unique biosignature of life on Earth is the homochirality of organic compounds, such as amino acids, proteins, and sugars. High-energy spin-polarized (spinup or spindown) electrons (SPEs) from the β decay of radioactive nuclei have been proposed as a
Thiem Hoang
doaj   +1 more source

Microscopic simulation of chemical processes on interstellar dust grains

ASTRONOMY AT THE EPOCH OF MULTIMESSENGER STUDIES. Proceedings of the VAK-2021 conference, Aug 23–28, 2021, 2022
A.I. Vasyunin, G.S. Fedoseev, A.B. Ostrovskii, M.G. Medvedev   +3 more
openaire   +1 more source

Are Stars Really Ingesting Their Planets? Examining an Alternative Explanation

The Astrophysical Journal
Numerous stars exhibit surprisingly large variations in their refractory element abundances, often interpreted as signatures of planetary ingestion events.
Nadine H. Soliman, Philip F. Hopkins
doaj   +1 more source

Consistent Modeling of Nonequilibrium Dust Sublimation and the Interactions with Dust Evolution in the Inner Regions of Protoplanetary Disks

The Astrophysical Journal
The inner regions of protoplanetary disks are host to the sublimation of dust grains, a process traditionally modeled using equilibrium thermodynamics.
Sheng Xu, Lile Wang, Luis C. Ho, Renyue Cen, Shenzhen Xu   +4 more
doaj   +1 more source

Electrostatic Transport Characteristics of Olivine Particles under Electron Irradiation in Vacuum

The Astrophysical Journal
Electrostatic dust transport on airless planetary bodies, such as the Moon, plays a crucial role in shaping their surface environment and influencing the evolution of surface materials.
Hong Gan, Jiahui Liu, Xiaoping Zhang, Hong Jin, Yang Li   +4 more
doaj   +1 more source

A Detection of Circumgalactic Dust at Megaparsec Scales with Maximum Likelihood Estimation

The Astrophysical Journal
One of the more surprising astrophysical discoveries of the past decade has been the presence of enormous quantities of dust at megaparsec distances from galaxies, which has important implications for galaxy evolution, the circumgalactic and ...
Jacqueline E. McCleary, Eric M. Huff, James G. Bartlett, Brandon S. Hensley   +3 more
doaj   +1 more source

Inhomogeneous Dust Biases Photometric Redshifts and Stellar Masses for LSST

The Astrophysical Journal Letters
Spectral energy distribution (SED) modeling is one of the main methods to estimate galaxy properties, such as photometric redshifts, z , and stellar masses, M _* , for extragalactic imaging surveys.
ChangHoon Hahn, Peter Melchior
doaj   +1 more source