Results 51 to 60 of about 1,290 (180)

The SOFIA Massive (SOMA) Star Formation Survey. II. High Luminosity Protostars [PDF]

The Astrophysical Journal, 2019
Abstract We present multiwavelength images observed with SOFIA-FORCAST from ∼10 to 40 μm of seven high luminosity massive protostars, as part of the SOFIA Massive Star Formation Survey. Source morphologies at these wavelengths appear to be influenced by outflow cavities and extinction from dense gas surrounding the protostars.
Mengyao Liu, Jonathan C. Tan, James M. De Buizer, Yichen Zhang, Maria T. Beltrán, Jan E. Staff, Kei E. I. Tanaka, Barbara Whitney, Viviana Rosero   +8 more
openaire   +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 VLA/ALMA Nascent Disk And Multiplicity (VANDAM) Survey of Orion protostars. V. A characterization of protostellar multiplicity [PDF]

, 2022
We characterize protostellar multiplicity in the Orion molecular clouds using Atacama Large Millimeter/submillimeter Array 0.87 mm and Very Large Array 9 mm continuum surveys toward 328 protostars.
Offner, Stella S.R., Diaz-Rodriguez, A., Tychoniec, Ł., Tobin, John J., Looney, Leslie W., Sadavoy, S., Kratter, Kaitlin M., Tobin, J.J., Sheehan, Patrick D., Karnath, Nicole, Diaz-rodriguez, Ana Karla, Van Dishoeck, Ewine F., Segura-Cox, D., van't Hoff, Merel L. R., Li, Z., Kratter, K., Osorio, M., Tobin, J., Megeath, S.T., Van 'T Hoff, M.L.R., Stutz, A., Osorio, Mayra, Stutz, A.M., Sadavoy, Sarah I., Furlan, E., Sheehan, P.D., Sadavoy, S.I., Sharma, Rajeeb, Karnath, N., Offner, Stella S. R., Segura-cox, Dominique, Offner, S.S.R., Stutz, Amelia M., Looney, L.W., Anglada, Guillem, Anglada, G., Kratter, K.M., Anglada Pons, Guillem Josep, Offner, S., Li, Zhi-yun, van't Hoff, M.L.R., Tychoniec, Łukasz, Dishoeck, E.F. van, van Dishoeck, E., Sharma, R., Looney, L., Van Dishoeck, E.F., Megeath, S., Sheehan, P., Diaz-Rodriguez, A.K., Van ’t Hoff, Merel L. R., van Hoff, M., Furlan, Elise, Li, Z.-Y., Megeath, S. Thomas   +54 more
core   +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

The Formation of Stars -- From Filaments to Cores to Protostars and Protoplanetry Disks

, 2019
Star formation involves the flow of gas and dust within molecular clouds into protostars and young stellar objects (YSOs) due to gravity. Along the way, these flows are shaped significantly by many other mechanisms, including pressure, turbulent motions, magnetic fields, stellar feedback, jets, and angular momentum.
Di Francesco, James, Kirk, Helen, Johnstone, Doug, Pudritz, Ralph, Basu, Shantanu, Sadavoy, Sarah, Fissel, Laura, Knee, Lewis, Tahani, Mehrnoosh, Friesen, Rachel, Coudé, Simon, Rosolowsky, Erik, van der Marel, Nienke, Fich, Michel, Wilson, Christine, Matzner, Chris, Dong, Ruobing, Matthews, Brenda, Schieven, Gerald   +18 more
openaire   +2 more sources

Rotational evolution of solar-type protostars during the star-disk interaction phase [PDF]

Astronomy & Astrophysics, 2019
Context. The early pre-main sequence phase during which solar-mass stars are still likely surrounded by an accretion disk represents a puzzling stage of their rotational evolution. While solar-mass stars are accreting and contracting, they do not seem to spin up substantially. Aims.
F. Gallet, C. Zanni, L. Amard
openaire   +5 more sources

Episodic excursions of low-mass protostars on the Hertzsprung-Russell diagram [PDF]

, 2019
Following our recent work devoted to the effect of accretion on the pre-main-sequence evolution of low-mass stars, we perform a detailed analysis of episodic excursions of low-mass protostars in the Hertzsprung-Russell (H-R) diagram triggered by strong ...
Elbakyan, Vardan G., Güdel, Manuel, Hosokawa, Takashi, Meyer, Dominique M.-A., Yorke, Harold, Rab, Christian, Vorobyov, Eduard I.   +6 more
core   +1 more source

On the Similarity of FU Orionis Stars to Class I Protostars: Evidence from the Submillimeter [PDF]

The Astrophysical Journal Supplement Series, 2001
On the basis of analysis of new submillimeter maps of a sample of most known FU Orionis stars, we confirm that these stars are extremely young, more similar to Class I protostars than to Class II T Tauri stars. The submillimeter maps reveal that FU Orionis stars have accretion disks that are larger and contain an order of magnitude more mass than those
Goran Sandell, David A. Weintraub
openaire   +1 more source

ALMA ACA study of the H$_2$S/OCS ratio in low-mass protostars

, 2023
The identification of the main sulfur reservoir on its way from the diffuse interstellar medium to the cold dense star-forming cores and eventually to protostars is a long-standing problem.
Benoît Tabone, Tychoniec, Łukasz, Drozdovskaya, Maria N., Kushwahaa, Tanya, Maria N. Drozdovskaya, Łukasz Tychoniec, Tabone, Benoît, Tanya Kushwahaa   +7 more
core   +1 more source

Star formation in the Vela Molecular Clouds: A new protostar powering a bipolar jet [PDF]

Astronomy & Astrophysics, 2005
We have performed a detailed study of the star-forming region associated with the IRAS source 08448-4343 in the cloud D of the Vela Molecular Ridge. Our investigation covers a wide spectral range from the near IR, through the thermal IR to the mm-band exploiting both imaging and spectroscopic facilities in each spectral regime.
T. Giannini, F. Massi, L. Podio, D. Lorenzetti, B. Nisini, null A. Caratti o Garatti, R. Liseau, G. Lo Curto, F. Vitali   +8 more
openaire   +1 more source