Results 91 to 100 of about 400,542 (301)
ChemPlusChem, Volume 90, Issue 11, November 10, 2025.The presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Jessica Perrero +3 more
wiley +1 more source
Unveiling Dust Aggregate Structure in Protoplanetary Disks by Millimeter-wave Scattering Polarization [PDF]
Astrophysical Journal, 2019 Dust coagulation in a protoplanetary disk is the first step in planetesimal formation. However, the pathway from dust aggregates to planetesimals remains unclear. Both numerical simulations and laboratory experiments have suggested the importance of dust
R. Tazaki +4 more
semanticscholar +1 more source
Substructures in Compact Disks of the Taurus Star-forming Region
The Astrophysical Journal, 2023 Observations of substructure in protoplanetary disks have largely been limited to the brightest and largest disks, excluding the abundant population of compact disks, which are likely sites of planet formation.
Shangjia Zhang +7 more
doaj +1 more source
Effect of dust grain porosity on the appearance of protoplanetary disks [PDF]
, 2014 We theoretically analyze protoplanetary disks consisting of porous dust grains. In the analysis of observations of protoplanetary disks the dust phase is often assumed to consist of spherical grains, allowing one to apply the Mie scattering formalism ...
Kirchschlager, F., Wolf, S.
core +1 more source
Physicochemical Constraints on the Abiotic Polymerization of Nucleotides Into RNA
Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 11, November 2025.Abstract One of the key steps in the origin of life is the polymerization of nucleotides into nucleic acids like RNA. We have quantified the energetic impact of temperature, pressure, and composition on the polymerization of nucleotides into RNA using the Gibbs function. These Gibbs energies have been used to calculate the probability that a nucleotide
D. E. LaRowe, J. M. Dick
wiley +1 more source
The Astronomical JournalClose binary systems present challenges to planet formation. As binary separations decrease, so do the occurrence rates of protoplanetary disks in young systems and planets in mature systems.
Benjamin M. Tofflemire +10 more
doaj +1 more source
Accumulation of Dust on a Surface and the Subsequent Formation of Compact Aggregate Piles
Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.Abstract Dust aggregation is a prominent topic in space physics, yet the accumulation of dust on surfaces in airless environments remains poorly understood. It is commonly assumed that, during the initial stages of dust deposition, particles spread uniformly to form a monolayer.
G. Griffin +4 more
wiley +1 more source
ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses [PDF]
Astronomy & Astrophysics, 2019 Context. In recent years, the disk populations in a number of young star-forming regions have been surveyed with the Atacama Large Millimeter/submillimeter Array (ALMA).
P. Cazzoletti +22 more
semanticscholar +1 more source
Chemistry in Externally FUV-irradiated Disks in the Outskirts of the Orion Nebula Cluster
The Astrophysical JournalMost stars are born in stellar clusters, and their protoplanetary disks, which are the birthplaces of planets, can, therefore, be affected by the radiation of nearby massive stars.
Javiera K. Díaz-Berríos +6 more
doaj +1 more source