Results 61 to 70 of about 11,786 (248)

MASERS AS TRACERS OF ANGULAR MOMENTUM IN MOLECULAR OUTFLOWS

Tecnociencia, 2023
The dissipation of angular momentum of collapsing molecular cores is a key component in the formation of stars. Previous observations have reported that highly collimated protostellar jets can remove angular momentum from low-mass protostars.
Diana V. López, Esteban D. Araya
doaj   +2 more sources

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a "Radical + Ice" Mechanism. [PDF]

Chempluschem
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 ...
Perrero J, Pantaleone S, Ugliengo P, Rimola A.   +3 more
europepmc   +2 more sources

The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. IV. Unveiling the Embedded Intermediate-Mass Protostar and Disk within OMC2-FIR3/HOPS-370 [PDF]

Astrophysical Journal, 2020
We present ALMA (0.87 and 1.3 mm) and VLA (9 mm) observations toward the candidate intermediate-mass protostar OMC2-FIR3 (HOPS-370; L bol ∼ 314 L ⊙) at ∼01 (40 au) resolution for the continuum emission and ∼025 (100 au) resolution of nine molecular lines.
J. Tobin, P. Sheehan, Nickalas K. Reynolds, S. Megeath, M. Osorio, G. Anglada, A. Díaz-Rodríguez, E. Furlan, K. Kratter, S. Offner, L. Looney, M. Kama, Zhi-Yun Li, M. V. van 't Hoff, S. Sadavoy, N. Karnath   +15 more
semanticscholar   +1 more source

Dust Polarization toward Embedded Protostars in Ophiuchus with ALMA. III. Survey Overview [PDF]

Astrophysical Journal Supplement Series, 2019
We present 0.″25 resolution (35 au) ALMA 1.3 mm dust polarization observations for 37 young stellar objects (YSOs) in the Ophiuchus molecular cloud. These data encompass all the embedded protostars in the cloud and several flat-spectrum and Class II ...
S. Sadavoy, I. Stephens, P. Myers, L. Looney, J. Tobin, W. Kwon, B. Commerçon, D. Segura-Cox, T. Henning, P. Hennebelle   +9 more
semanticscholar   +1 more source

The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). IV. Free–Free Emission from Protostars: Links to Infrared Properties, Outflow Tracers, and Protostellar Disk Masses [PDF]

Astrophysical Journal Supplement Series, 2018
Emission from protostars at centimeter radio wavelengths has been shown to trace the free–free emission arising from ionizing shocks as a result of jets and outflows driven by protostars. Therefore, measuring properties of protostars at radio frequencies
Ł. Tychoniec, J. Tobin, A. Karska, C. Chandler, M. Dunham, R. Harris, K. Kratter, Zhi-Yun Li, L. Looney, C. Melis, L. Pérez, S. Sadavoy, D. Segura-Cox, E. van Dishoeck   +13 more
semanticscholar   +1 more source

Merger Conditions of Population III Protostar Binaries

The Astrophysical Journal, 2023
Massive close binary stars with extremely small separations have been observed, and they are possible progenitors of gravitational-wave sources. The evolution of massive binaries in the protostellar accretion stage is key to understanding their formation
Takanobu Kirihara, Hajime Susa, Takashi Hosokawa, Tomoya Kinugawa   +3 more
doaj   +1 more source

Surveys for OB protostars

, 2005
International audienceThe specificity of the formation of OB stars and the importance of understanding the origin of stellar masses up to the highest masses justify an effort to identify the protostellar precursors of high-mass stars.
Bontemps, Sylvain, Herpin, Fabrice, Motte, F., Schneider, N.   +3 more
core   +2 more sources

Observations of phosphorus-bearing molecules in the interstellar medium

Frontiers in Astronomy and Space Sciences
The chemistry of phosphorus (31P) in space is particularly significant due to the key role it plays in biochemistry on Earth. Utilising radio and infrared spectroscopic observations, several key phosphorus-containing molecules have been detected in ...
Francesco Fontani, Francesco Fontani, Francesco Fontani   +2 more
doaj   +1 more source

JWST Observations of Young protoStars (JOYS+): Detecting icy complex organic molecules and ions

Astronomy & Astrophysics
Complex organic molecules (COMs) are ubiquitously detected in the gas phase and thought to be mostly formed on icy grains. Nevertheless, there have not been any unambiguous detections of COMs larger than CH$_3$OH in ices reported thus far. Exploring this
W. R. M. Rocha, E. van Dishoeck, M. Ressler, M. V. van Gelder, K. Slavicinska, N. Brunken, H. Linnartz, T. Ray, H. Beuther, A. Garatti, V. Geers, P. Kavanagh, P. Klaassen, K. Justannont, Y. Chen, L. Francis, C. Gieser, G. Perotti, Ł. Tychoniec, M. Barsony, L. Majumdar, V. L. Le Gouellec, L. Chu, B. W. P. Lew, T. Henning, G. Wright   +25 more
semanticscholar   +1 more source

Opacity Limit for Supermassive Protostars [PDF]

The Astrophysical Journal, 2018
Abstract We present a model for the evolution of supermassive protostars from their formation at until their growth to .
Fernando Becerra, Federico Marinacci, Kohei Inayoshi, Volker Bromm, Lars E. Hernquist   +4 more
openaire   +3 more sources