Results 71 to 80 of about 22,863 (213)

Constraining the abundances of complex organics in the inner regions of solar-type protostars [PDF]

, 2015
The high abundances of Complex Organic Molecules (COMs) with respect to methanol, the most abundant COM, detected towards low-mass protostars, tend to be underpredicted by astrochemical models.
Ceccarelli, Cecilia, Charnley, Steven B., Kahane, Claudine, López-Sepulcre, Ana, Neri, Roberto, Taquet, Vianney   +5 more
core   +3 more sources

Coevolution of phyllosilicate, carbon, sulfide, and apatite in Ryugu's parent body

Meteoritics &Planetary Science, Volume 59, Issue 8, Page 2073-2096, August 2024.
Abstract We analyzed an asteroid Ryugu sample returned to Earth by JAXA's Hayabusa2 mission using nanoIR, SEM, and TEM microscopy. We identified multiple distinct carbon reservoirs within the phyllosilicate matrix and demonstrate infrared spectral affinities for some of the carbon to insoluble organic matter (IOM).
Zack Gainsforth, Gerardo Dominguez, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Eiichi Kagawa, Tomoki Nakamura, Shogo Tachibana, Tomoyo Morita, Mizuha Kikuiri, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masano Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei‐ichiro Watanabe, Yuichi Tsuda, Hayabusa2 Initial Analysis Stone Team   +31 more
wiley   +1 more source

The JWST-NIRCam View of Sagittarius C. I. Massive Star Formation and Protostellar Outflows

The Astrophysical Journal
We present James Webb Space Telescope (JWST) Near Infrared Camera observations of the massive star-forming molecular cloud Sagittarius C (Sgr C) in the Central Molecular Zone (CMZ).
Samuel Crowe, Rubén Fedriani, Jonathan C. Tan, Alva Kinman, Yichen Zhang, Morten Andersen, Lucía Bravo Ferres, Francisco Nogueras-Lara, Rainer Schödel, John Bally, Adam Ginsburg, Yu Cheng, Yao-Lun Yang, Sarah Kendrew, Chi-Yan Law, Joseph Armstrong, Zhi-Yun Li   +16 more
doaj   +1 more source

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

Studying the Effect of Radiation Pressure on Evolution of a Population III Stellar Cluster

The Astrophysical Journal
Recent numerical simulations have shown that the unstable disk within the central regime of the primordial gas cloud fragments to form multiple protostars on several scales.
Sukalpa Kundu, Jayanta Dutta
doaj   +1 more source

METHYL CYANIDE OBSERVATIONS TOWARD MASSIVE PROTOSTARS [PDF]

The Astrophysical Journal Supplement Series, 2013
We report the results of a survey in the CH3CN J= 12-11 transition toward a sample of massive proto-stellar candidates. The observations were carried out with the 10 m Submillimeter telescope on Mount Graham, AZ. We detected this molecular line in 9 out of 21 observed sources. In six cases this is the first detection of this transition.
Araya, E., Bieging, J., Kurtz, S., Hofner, P., Bieging, J., Araya, E., Kurtz, S., Rosero, V., Hofner, P., Rosero, V.   +9 more
openaire   +2 more sources

EVOLUTION OF MASS OUTFLOW IN PROTOSTARS [PDF]

The Astrophysical Journal, 2016
ABSTRACT We have surveyed 84 Class 0, Class I, and flat-spectrum protostars in mid-infrared [Si ii], [Fe ii], and [S i] line emission, and 11 of these in far-infrared [O i] emission. We use the results to derive their mass outflow rates, .
Dan M. Watson, Nuria P. Calvet, William J. Fischer, W. J. Forrest, P. Manoj, S. Thomas Megeath, Gary J. Melnick, Joan Najita, David A. Neufeld, Patrick D. Sheehan, Amelia M. Stutz, John J. Tobin   +11 more
openaire   +2 more sources

Magnetic field measurements in a sample of Class I and flat-spectrum protostars observed with SPIRou

Astronomy & Astrophysics
Context. Magnetic fields play a crucial role throughout stellar evolution in regulating angular momentum, channelling accretion, and launching jets and outflows.
Drouglazet L., Alecian E., Sousa A., Cristofari P. I., Artigau E., Bouvier J., Carmona A., Cook N. J., Dougados C., Duchêne G., Folsom C. P., Nowacki H., Perraut K., Alencar S. H. P., Amard L., Audard M., Cabrit S., Donati J.-F., Grankin K., Grosso N., Kochukhov O., Kóspál Á., Le Gouellec V. J. M., Manchon L., Pantolmos G., Petit P., Petitdemange L., Devaraj R., Shang H., Takami M.   +29 more
doaj   +1 more source

JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region

The Astrophysical Journal Letters, 2023
Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mechanism behind these phenomena, including how they affect the protoplanetary ...
D. Harsono, P. Bjerkeli, J. P. Ramsey, K. M. Pontoppidan, L. E. Kristensen, J. K. Jørgensen, H. Calcutt, Z-Y. Li, A. Plunkett   +8 more
doaj   +1 more source

Herschel far-infrared photometric monitoring of protostars in the Orion Nebula Cluster [PDF]

, 2012
We have obtained time series observations of the Orion Nebula Cluster at 70 microns and 160 microns from the Herschel/PACS Photometer. This represents the first wide-field far-infrared photometric monitoring of a young star forming region.
Cantalupo, Carpenter, Dunham, Espaillat, Flaherty, Flaherty, Harvey, Herbst, Ke, Kryukova, Lemke, Manoj, Megeath, Megeath, Morales-Calderón, Morales-Calderón, Muzerolle, Ott, Roussel, Sitko, Turner, Vorobyov, Werner, Zhu   +23 more
core   +2 more sources