Results 71 to 80 of about 13,657 (239)

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

CH3OH Thermal Lines Traces 6.7 GHz CH3OH Maser Variation of High-mass Protostar G353.273+0.641

The Astrophysical Journal
This study reports an analysis of the 6.7 GHz CH _3 OH maser in the high-mass protostar G353.273+0.641 (G353), utilizing data from the Tianma Radio Telescope.
Shi-Min Song, Xi Chen, Sheng-Yuan Liu, Jun-Ting Liu   +3 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

Effect of Magnetic Field on the Accretion Phase of Population III Star Formation

The Astrophysical Journal
We examine the impact of the magnetic field on Population III star formation by varying its strength. We perform simulations with magnetic field strengths ranging from 10 ^−20 G to 10 ^−4 G, in addition to a model without a magnetic field.
Masahiro N. Machida, Shingo Hirano, Shantanu Basu   +2 more
doaj   +1 more source

Disk wind feedback from high-mass protostars

, 2019
We perform a sequence of 3D magnetohydrodynamic (MHD) simulations of the outflow-core interaction for a massive protostar forming via collapse of an initial cloud core of $60~{M_\odot}$.
Staff, Jan E., Tan, Jonathan C., Tanaka, Kei E. I.   +2 more
core   +1 more source

The Formation of the First Stars II. Radiative Feedback Processes and Implications for the Initial Mass Function [PDF]

, 2008
We consider the radiative feedback processes that operate during the formation of the first stars, including the photodissociation of H_2, Ly-alpha radiation pressure, formation and expansion of an HII region, and disk photoevaporation.
Christopher F. McKee, Haehnelt M. G., Harrington J. P., Ivanov V. V., Jonathan C. Tan, Larson R. B., Larson R. B., Meyer F., Paczynski B., Penston M. V., Shakura N. I., Tarter C. B.   +11 more
core   +1 more source

Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557 [PDF]

, 2017
We have resolved for the first time the radial and vertical structure of the almost edge-on envelope/disk system of the low-mass Class 0 protostar L1527. For that, we have used ALMA observations with a spatial resolution of 0.25$^{\prime\prime}$$\times$0.
Aikawa, Yuri, Caux, Emmanuel, Ceccarelli, Cecilia, Hanawa, Tomoyuki, Higuchi, Aya E., Hirota, Tomoya, Kahane, Claudine, Lefloch, Bertrand, López-Sepulcre, Ana, Oya, Yoko, Sakai, Nami, Sakai, Takeshi, Vastel, Charlotte, Watanabe, Yoshimasa, Yamamoto, Satoshi   +14 more
core   +2 more sources

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

Evidence for Jet/Outflow Shocks Heating the Environment around the Class I Protostellar Source Elias 29: FAUST XXI

The Astrophysical Journal
We have observed the late Class I protostellar source Elias 29 at a spatial resolution of 70 au with the Atacama Large Millimeter/submillimeter Array as part of the FAUST Large Program.
Yoko Oya, Eri Saiga, Anna Miotello, Maria Koutoulaki, Doug Johnstone, Cecilia Ceccarelli, Claire J. Chandler, Claudio Codella, Nami Sakai, Eleonora Bianchi, Mathilde Bouvier, Steven Charnley, Nicolas Cuello, Marta De Simone, Logan Francis, Tomoyuki Hanawa, Izaskun Jiménez-Serra, Laurent Loinard, Francois Menard, Giovanni Sabatini, Charlotte Vastel, Ziwei Zhang, Yuri Aikawa, Felipe O. Alves, Nadia Balucani, Gemma Busquet, Paola Caselli, Emmanuel Caux, Spandan Choudhury, Francois Dulieu, Aurora Durán, Lucy Evans, Davide Fedele, Siyi Feng, Francesco Fontani, Tetsuya Hama, Eric Herbst, Shingo Hirano, Tomoya Hirota, Andrea Isella, Claudine Kahane, Bertrand Lefloch, Romane Le Gal, Hauyu Baobab Liu, Ana López-Sepulcre, Luke T. Maud, María José Maureira, Seyma Mercimek, George Moellenbrock, Shoji Mori, Hideko Nomura, Yasuhiro Oba, Ross O’Donoghue, Satoshi Ohashi, Yuki Okoda, Juan Ospina-Zamudio, Jaime Pineda, Linda Podio, Albert Rimola, Takeshi Sakai, Dominique Segura-Cox, Yancy Shirley, Brian Svoboda, Leonardo Testi, Serena Viti, Naoki Watanabe, Yoshimasa Watanabe, Yichen Zhang, Satoshi Yamamoto   +68 more
doaj   +1 more source

Near-infrared Polarimetry and H2 Emission toward Massive Young Stars: Discovery of a Bipolar Outflow Associated to S235 e2s3

The Astrophysical Journal, 2023
We present a near-infrared H- band polarimetric study toward the S235 e2s3 protostar, obtained using the POLICAN instrument on the 2.1 m OAGH telescope. The images reveal a bipolar outflow with a total length of about 0.5 pc.
R. Devaraj, A. Caratti o Garatti, L. K. Dewangan, R. Fedriani, T. P. Ray, A. Luna   +5 more
doaj   +1 more source