Results 71 to 80 of about 399,848 (263)

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a “Radical + Ice” Mechanism

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, Stefano Pantaleone, Piero Ugliengo, Albert Rimola   +3 more
wiley   +1 more source

On the Formation of Planets in the Milky Way’s Thick Disk

The Astrophysical Journal
Exoplanet demographic surveys have revealed that close-in (≲1 au) small planets orbiting stars in the Milky Way’s thick disk are ∼50% less abundant than those orbiting stars in the Galactic thin disk.
Tim Hallatt, Eve J. Lee
doaj   +1 more source

Protoplanetary disk lifetimes vs stellar mass and possible implications for giant planet populations

, 2015
We study the dependence of protoplanetary disk evolution on stellar mass using a large sample of young stellar objects in nearby young star-forming regions. We update the protoplanetary disk fractions presented in our recent work (paper I of this series)
Bouy, Hervé, Merín, Bruno, Ribas, Álvaro   +2 more
core   +1 more source

Formation, Orbital and Internal Evolutions of Young Planetary Systems [PDF]

, 2016
The growing body of observational data on extrasolar planets and protoplanetary disks has stimulated intense research on planet formation and evolution in the past few years.
Bai, Xuening, Baruteau, Clément, Mollière, Paul, Mordasini, Christoph   +3 more
core   +3 more sources

Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-resolution ALMA Observations [PDF]

Astrophysical Journal, 2018
We present Atacama Large Millimeter Array 850 μm continuum observations of the Orion Nebula Cluster that provide the highest angular resolution (∼0.″1 ≈ 40 au) and deepest sensitivity (∼0.1 mJy) of the region to date. We mosaicked a field containing ∼225
J. Eisner, H. Arce, N. Ballering, J. Bally, S. Andrews, R. Boyden, J. Francesco, M. Fang, D. Johnstone, J. Kim, R. Mann, B. Matthews, I. Pascucci, L. Ricci, P. Sheehan, J. Williams   +15 more
semanticscholar   +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

Shedding Light on the Origin of the Broken Misaligned Circumtriple Disk around GW Ori

The Astrophysical Journal Letters
We revisit the origin of the observed misaligned rings in the circumtriple disk around GW Ori. Previous studies appeared to disagree on whether disk breaking is caused by the differential precession driven in the disk by the triple star system.
Jeremy L. Smallwood, Stephen H. Lubow, Rebecca G. Martin, Rebecca Nealon   +3 more
doaj   +1 more source

Self-Sustained Ionization and Vanishing Dead Zones in Protoplanetary Disks

, 2005
We analyze the ionization state of the magnetohydrodynamically turbulent protoplanetary disks and propose a new mechanism of sustaining ionization. First, we show that in the quasi-steady state of turbulence driven by magnetorotational instability in a ...
Inutsuka, Shu-ichiro, Sano, Takayoshi
core   +1 more source

Volatiles in protoplanetary disks [PDF]

, 2014
Volatiles are compounds with low sublimation temperatures, and they make up most of the condensible mass in typical planet-forming environments. They consist of relatively small, often hydrogenated, molecules based on the abundant elements carbon ...
Bergin, Edwin A., Brittain, Sean, Marty, Bernard, Mousis, Olvier, Oberg, Karin L., Pontoppidan, Klaus M., Salyk, Colette   +6 more
core   +2 more sources

Diffusion and Concentration of Solids in the Dead Zone of a Protoplanetary Disk [PDF]

Astrophysical Journal, 2018
The streaming instability is a promising mechanism to drive the formation of planetesimals in protoplanetary disks. To trigger this process, it has been argued that sedimentation of solids onto the mid-plane needs to be efficient, and therefore that a ...
Chao-Chin 欽 Yang 楊朝, M. Mac Low, A. Johansen   +2 more
semanticscholar   +1 more source