Results 101 to 110 of about 793,175 (240)

Laboratory Detection of the Methoxymethyl Radical, CH3OCH2, Using Faraday Rotation and Chirped-pulse Techniques in the (Sub)millimeter Wave Range

The Astrophysical Journal
Modeling the abundance of interstellar complex organic molecules in space is a major challenge for astrophysicists. The relative roles of gas-phase and grain-surface processes in the formation and destruction of such large molecules remain unclear ...
Rosemonde Chahbazian, Marie-Aline Martin-Drumel, Olivier Pirali   +2 more
doaj   +1 more source

Ancient planetary systems are orbiting a large fraction of white dwarf stars

, 2010
Infrared studies have revealed debris likely related to planet formation in orbit around ~30% of youthful, intermediate mass, main sequence stars.
B. Klein, B. Zuckerman, Bennett, Bergeron, Bowler, C. Melis, Chiang, Currie, D. Koester, Davis, Debes, Desharnais, Dufour, Dufour, Eisenstein, Farihi, Farihi, Gorlova, Jura, Jura, Jura, Jura, Jura, Jura, Jura, Jura, Kilic, Kilic, Kilic, Klein, Koester, Limoges, Lodders, M. Jura, Macintosh, McCook, Melis, Osterbrock, Reach, Rebull, Rhee, Sfeir, Sion, Su, Su, Tremblay, Trilling, Trujillo, von Hippel, Zuckerman, Zuckerman   +50 more
core   +1 more source

The X-ray Iron Emission from Tycho's Supernova Remnant [PDF]

, 1997
We present the results of broadband fits to the X-ray spectrum of Tycho's supernova remnant obtained by the Solid-State Imaging Spectrometers on the ASCA Observatory.
Albinson J. S., Braun R., Fink H. H., Green D. A., John P. Hughes, Mewe R., Reynolds S. R., Robert Petre, Una Hwang   +8 more
core   +2 more sources

Dynamic Test Particle Simulations of X‐Ray Emissions at Dayside Magnetopause Under Time‐Varying Solar Wind Conditions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The Latmos Test Particle (LaTeP) model is a steady‐state test particle code to investigate the solar wind charge exchange soft X‐ray emissions of the steady‐state Earth magnetosphere. In this study, we present the development of a new dynamic version (D‐LaTeP) extending the LaTeP model to adapt to time‐varying solar wind conditions.
Qiuyu Xu, Dimitra Koutroumpa, Ronan Modolo, Binbin Tang   +3 more
wiley   +1 more source

Effects of turbulent dust grain motion to interstellar chemistry

, 2015
Theoretical studies have revealed that dust grains are usually moving fast through the turbulent interstellar gas, which could have significant effects upon interstellar chemistry by modifying grain accretion.
Ge, J. X., He, J. H., Yan, H. R.
core   +1 more source

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

Molecular Deuterations in Massive Starless Clump Candidates

The Astrophysical Journal Supplement Series
Deuterated molecules are valuable probes for investigating the evolution and the kinematics in the earliest stages of star formation. In this study, we conduct a comprehensive investigation by performing a single-point survey of 101 starless clump ...
Kai Yang, Junzhi Wang, Keping Qiu, Tianwei Zhang   +3 more
doaj   +1 more source

Gas phase atomic metals in the circumstellar envelope of IRC+10216

, 2010
We report the results of a search for gas phase atomic metals in the circumstellar envelope of the AGB carbon star IRC+10216. The search was made using high resolution (R=50000) optical absorption spectroscopy of a backgound star that probes the envelope
Chaffee, Cherchneff, Coelho, Cordiner, Cox, Delgado Inglada, Dunbar, Field, Gilman, Glassgold, Highberger, Huggins, Huggins, Huggins, Jura, Kendall, Keyes, Kingdon, Kwan, Lafont, Lodders, Lodders, Loup, Martin, Mauron, Mauron, Mauron, McCabe, Middlemass, Morris, Morton, Morton, N. Mauron, Olofsson, P. J. Huggins, Péquignot, Ramstedt, Savage, Schöier, Tsuji, Turner, Young, Zhang, Ziurys, Ziurys, Ziurys, Ziurys   +46 more
core   +1 more source

Metal‐Induced Tuning of Fullerene Reactivity: Application to Nucleophile Addition

ChemPhysChem, Volume 26, Issue 23, November 28, 2025.
A textbook case of how encapsulating an atom in a carbon cage can tune assembly reactivity based on partial charge distribution–exemplified by the classic nucleophilic attack. Endohedral metallofullerenes (EMFs) are a unique class of hybrid molecules formed by encapsulating metal atoms within carbon cages (fullerenes), giving rise to distinctive ...
Corentin Rossi, Anne P. Rasmussen, Bérenger Gans, Ugo Jacovella   +3 more
wiley   +1 more source

Carbon Isotope Fractionation of Complex Organic Molecules in Star-forming Cores

The Astrophysical Journal
Recent high-resolution and sensitivity Atacama Large Millimeter/submillimeter Array observations have unveiled the carbon isotope ratios ( ^12 C/ ^13 C) of complex organic molecules (COMs) in a low-mass protostellar source. To understand the ^12 C/ ^13 C
Ryota Ichimura, Hideko Nomura, Kenji Furuya   +2 more
doaj   +1 more source