Results 1 to 10 of about 434 (137)

Enlightening the Chemistry of Infalling Envelopes and Accretion Disks Around Sun-Like Protostars: The ALMA FAUST Project

Frontiers in Astronomy and Space Sciences, 2021
The huge variety of planetary systems discovered in recent decades likely depends on the early history of their formation. In this contribution, we introduce the FAUST Large Program which focuses specifically on the early history of solar-like protostars
C. Codella, C. Codella, C. Ceccarelli, C. Chandler, N. Sakai, S. Yamamoto, The FAUST Team   +6 more
doaj   +1 more source

Extension of HOPS out to 500 pc (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds

The Astrophysical Journal Supplement Series, 2023
We present a Spitzer/Herschel focused survey of the Aquila molecular clouds ( d ∼ 436 pc) as part of the eHOPS (extension of the Herschel orion protostar survey, or HOPS, Out to 500 ParSecs) census of nearby protostars.
Riwaj Pokhrel, S. Thomas Megeath, Robert A. Gutermuth, Elise Furlan, William J. Fischer, Samuel Federman, John J. Tobin, Amelia M. Stutz, Lee Hartmann, Mayra Osorio, Dan M. Watson, Thomas Stanke, P. Manoj, Mayank Narang, Prabhani Atnagulov, Nolan Habel, Wafa Zakri   +16 more
doaj   +1 more source

ORPHANED PROTOSTARS [PDF]

The Astrophysical Journal, 2010
We explore the origin of a population of distant companions (~1000 - 5000 AU) to Class I protostellar sources recently found by Connelley and co-workers, who noted that the companion fraction diminished as the sources evolved. Here we present N-body simulations of unstable triple systems embedded in dense cloud cores.
Reipurth, Bo, Mikkola, Seppo, Connelley, Michael, Valtonen, Mauri   +3 more
openaire   +2 more sources

Recent progress with observations and models to characterize the magnetic fields from star-forming cores to protostellar disks

Frontiers in Astronomy and Space Sciences, 2022
In this review article, we aim at providing a global outlook on the progresses made in the recent years to characterize the role of magnetic fields during the embedded phases of the star formation process.
Anaëlle Maury, Anaëlle Maury, Patrick Hennebelle, Josep Miquel Girart, Josep Miquel Girart   +4 more
doaj   +1 more source

Dynamo in protostars [PDF]

Pramana, 2013
5 ...
Verma, Mahendra K, Karak, Bidya Binay, Kumar, Rohit   +2 more
openaire   +3 more sources

Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results

The Astrophysical Journal, 2023
We present an overview of the Large Program, “Early Planet Formation in Embedded Disks (eDisk),” conducted with the Atacama Large Millimeter/submillimeter Array (ALMA).
Nagayoshi Ohashi, John J. Tobin, Jes K. Jørgensen, Shigehisa Takakuwa, Patrick Sheehan, Yuri Aikawa, Zhi-Yun Li, Leslie W. Looney, Jonathan P. Williams, Yusuke Aso, Rajeeb Sharma, Jinshi Sai (Insa Choi), Yoshihide Yamato, Jeong-Eun Lee, Kengo Tomida, Hsi-Wei Yen, Frankie J. Encalada, Christian Flores, Sacha Gavino, Miyu Kido, Ilseung Han, Zhe-Yu Daniel Lin, Suchitra Narayanan, Nguyen Thi Phuong, Alejandro Santamaría-Miranda, Travis J. Thieme, Merel L. R. van ’t Hoff, Itziar de Gregorio-Monsalvo, Patrick M. Koch, Woojin Kwon, Shih-Ping Lai, Chang Won Lee, Adele Plunkett, Kazuya Saigo, Shingo Hirano, Ka Ho Lam, Shoji Mori   +36 more
doaj   +1 more source

Identification of A Collapsing Protostar [PDF]

Astrophysics and Space Science, 1994
The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc.
Neal J. Evans, Shudong Zhou, Carsten Kömpe, C. M. Walmsley   +3 more
openaire   +1 more source

CO in Protostars (COPS): Herschel-SPIRE Spectroscopy of Embedded Protostars^∗ [PDF]

The Astrophysical Journal, 2018
Abstract We present full spectral scans from 200 to 670 μm of 26 Class 0+I protostellar sources obtained with Herschel-SPIRE as part of the “COPS-SPIRE” Open Time program, complementary to the DIGIT and WISH Key Programs. Based on our nearly continuous, line-free spectra from 200 to 670 μm, the calculated bolometric luminosities (L
Yao-Lun Yang, Joel D. Green, Neal J. Evans II, Jeong-Eun Lee, Jes K. Jørgensen, Lars E. Kristensen, Joseph C. Mottram, Gregory Herczeg, Agata Karska, Odysseas Dionatos, Edwin A. Bergin, Jeroen Bouwman, Ewine F. van Dishoeck, Tim A. van Kempen, Rebecca L. Larson, Umut A. Yıldız   +15 more
openaire   +8 more sources

The Rate, Amplitude, and Duration of Outbursts from Class 0 Protostars in Orion

The Astrophysical Journal Letters, 2022
At least half of a protostar’s mass is accreted in the Class 0 phase, when the central protostar is deeply embedded in a dense, infalling envelope. We present the first systematic search for outbursts from Class 0 protostars in the Orion clouds.
Wafa Zakri, S. T. Megeath, William J. Fischer, Robert Gutermuth, Elise Furlan, Lee Hartmann, Nicole Karnath, Mayra Osorio, Emily Safron, Thomas Stanke, Amelia M. Stutz, John J. Tobin, Thomas S. Allen, Sam Federman, Nolan Habel, P. Manoj, Mayank Narang, Riwaj Pokhrel, Luisa Rebull, Patrick D. Sheehan, Dan M. Watson   +20 more
doaj   +1 more source

Kinetics of the tautomerization of thioimidic acids R−C(SH)NH → R−C(S)NH2: For R = H, F, HO, CN, NC, H2N, HC(O), HC(S), HC≡ C, CH3, CF3, H2C=CH, HOCH2, H2NCH2,CH3C(O), C2H5, (CH3)2CH, C6H5

International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023
Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley   +1 more source