Results 11 to 20 of about 3,278,550 (239)

Gas flow and accretion via spiral streamers and circumstellar disks in a young binary protostar [PDF]

Science, 2019
Gas flows and disks in a young binary Many stars are in binary systems, pairs of stars gravitationally bound to each other, often with the two components having similar masses. It remains unclear how these systems assemble and accrete material.
Felipe O. Alves, Paola Caselli, J. Girart, D. Segura-Cox, G. A. P. Franco, A. Schmiedeke, Bo Zhao   +6 more
semanticscholar   +3 more sources

No Evidence of Circumstellar Gas Surrounding Type Ia Supernova SN 2017cbv [PDF]

The Astrophysical Journal Letters, 2017
Nearby type Ia supernovae (SNe Ia), such as SN 2017cbv, are useful events to address the question of what the elusive progenitor systems of the explosions are. Hosseinzadeh et al.
R. Ferretti, R. Amanullah, M. Bulla, A. Goobar, J. Johansson, P. Lundqvist   +5 more
semanticscholar   +6 more sources

n-Alkanes formed by methyl-methylene addition as a source of meteoritic aliphatics [PDF]

Communications Chemistry
Aliphatics prevail in asteroids, comets, meteorites and other bodies in our solar system. They are also found in the interstellar and circumstellar media both in gas-phase and in dust grains.
P. Merino, L. Martínez, G. Santoro, J. I. Martínez, K. Lauwaet, M. Accolla, N. Ruiz del Arbol, C. Sánchez-Sánchez, A. Martín-Jimenez, R. Otero, M. Piantek, D. Serrate, R. Lebrón-Aguilar, J. E. Quintanilla-López, J. Mendez, P. L. De Andres, J. A. Martín-Gago   +16 more
doaj   +2 more sources

Determining the mid-plane conditions of circumstellar discs using gas and dust modelling: a study of HD 163296 [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
The mass of gas in protoplanetary discs is a quantity of great interest for assessing their planet formation potential. Disc gas masses are, however, traditionally inferred from measured dust masses by applying an assumed standard gas-to-dust ratio of g ...
D. M. Boneberg, O. Pani'c, T. J. Haworth, C. Clarke, M. Min   +4 more
semanticscholar   +3 more sources

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

Astronomy and Astrophysics, 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
exaly   +3 more sources

Imaging the Small-Scale Circumstellar Gas Around T~Tauri Stars [PDF]

The Astronomical Journal, 1995
We have detected circumstellar molecular gas around a small sample of T Tauri stars through aperture synthesis imaging of CO(2-1) emission at ~2-3'' resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and elongated gaseous emission. For RY
D. Koerner, A. Sargent
semanticscholar   +5 more sources

Model for the circumstellar gas around alpha Orionis

The Astrophysical Journal, 1981
Models are presented to explain the physical conditions in the circumstellar envelope surrounding the red supergiant Alpha Orionis. The models of the CO density and neutral atomic potassium density are calculated for the outer shell to reproduce simultaneously both the radio detection of CO and optical measurements of the amount of scattering by ...
M. Jura, M. Morris
semanticscholar   +2 more sources

Upper limit for circumstellar gas around the type Ia SN 2000cx [PDF]

Astronomy & Astrophysics, 2007
Context. The nature of the companion stars in type Ia Supernova (SNe) progenitor systems remains unclear. One possible way to discriminate between different scenarios is the presence (or absence) of circumstellar material, the left overs from the ...
F. Patat, S. Benetti, S. Justham, P. Mazzali, L. Pasquini, E. Cappellaro, M. Valle, P. Podsiadlowski, M. Turatto, A. Gal-yam, J. Simon   +10 more
semanticscholar   +7 more sources

Are young supernova remnants interacting with circumstellar gas

The Astrophysical Journal, 1982
The young remnants of galactic Type I supernovae (SN 1006, SN 1572, and SN 1604) appear to be interacting with moderately dense gas (n/sub O/> or =0.1 cm/sup -3/). If the gas in the ambient interstellar medium, the observations suggest that gas of this density is fairly pervasive.
R. Chevalier
semanticscholar   +2 more sources

Is Phenylnitrene a Missing Link in the Formation of Polycyclic Aromatic Nitrogen Heterocycles? [PDF]

Angewandte Chemie International Edition, Volume 64, Issue 31, July 28, 2025.
A new formation pathway for polycyclic aromatic nitrogen heterocycles (PANHs) has been found. The reaction of phenylnitrene and the propargyl radical leads to quinoline, proving that nitrenes are suitable precursors for nitrogen incorporation mechanisms.
Rahel Arns, Rory McClish, Patrick Hemberger, Andras Bodi, Jordy Bouwman, Tina Kasper, Domenik Schleier   +6 more
wiley   +2 more sources