Results 81 to 90 of about 25,326 (243)

Early Planet Formation in Embedded Disks (eDisk). III. A First High-resolution View of Submillimeter Continuum and Molecular Line Emission toward the Class 0 Protostar L1527 IRS

The Astrophysical Journal, 2023
Studying the physical and chemical conditions of young embedded disks is crucial to constrain the initial conditions for planet formation. Here we present Atacama Large Millimeter/submillimeter Array observations of dust continuum at ∼0.″06 (8 au ...
Merel L. R. van ’t Hoff, John J. Tobin, Zhi-Yun Li, Nagayoshi Ohashi, Jes K. Jørgensen, Zhe-Yu Daniel Lin, Yuri Aikawa, Yusuke Aso, Itziar de Gregorio-Monsalvo, Sacha Gavino, Ilseung Han, Patrick M. Koch, Woojin Kwon, Chang Won Lee, Jeong-Eun Lee, Leslie W. Looney, Suchitra Narayanan, Adele Plunkett, Jinshi Sai (Insa Choi), Alejandro Santamaría-Miranda, Rajeeb Sharma, Patrick D. Sheehan, Shigehisa Takakuwa, Travis J. Thieme, Jonathan P. Williams, Shih-Ping Lai, Nguyen Thi Phuong, Hsi-Wei Yen   +27 more
doaj   +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

Jets in Low-Mass Protostars

Universe
Jets and outflows are key components of low-mass star formation, regulating accretion and shaping the surrounding molecular clouds. These flows, traced by molecular species at (sub)millimeter wavelengths (e.g., CO, SiO, SO, H2CO, and CH3OH) and by atomic,
Somnath Dutta
doaj   +1 more source

Continuum Variability of Deeply Embedded Protostars as a Probe of Envelope Structure [PDF]

, 2013
Stars may be assembled in large growth spurts, however the evidence for this hypothesis is circumstantial. Directly studying the accretion at the earliest phases of stellar growth is challenging because young stars are deeply embedded in optically thick ...
Bruderer, Simon, Hendricks, Benjamin, Herczeg, Gregory J., Johnstone, Doug   +3 more
core   +1 more source

Key Physical Parameters Influencing Fragmentation and Multiplicity in Dense Cores of Orion A

The Astrophysical Journal
When dense cores in molecular clouds or filamentary structures collapse and form protostars, they may undergo fragmentation and form binary or multiple systems.
Jo-Shui Kao, Hsi-Wei Yen, Shih-Ping Lai
doaj   +1 more source

Spitzer Space Telescope Spectroscopy of Ices toward Low-Mass Embedded Protostars [PDF]

, 2004
Sensitive 5-38 μm Spitzer Space Telescope and ground-based 3-5 μm spectra of the embedded low-mass protostars B5 IRS1 and HH 46 IRS show deep ice absorption bands superposed on steeply rising mid-infrared continua.
Blake, Geoffrey A., Boogert, A. C. Adwin, Brooke, Timothy Y., Brown, Joanna, Morris, Patrick, Noriega-Crespo, Alberto, Padgett, Deborah L., Sargent, Anneila I., Stapelfeldt, Karl R.   +8 more
core   +1 more source

Protostellar half-life: new methodology and estimates

, 2018
(Abridged) Protostellar systems evolve from prestellar cores, through the deeply embedded stage and then disk-dominated stage, before they end up on the main sequence.
Dunham, M. M., Kristensen, L. E.
core   +1 more source

Detections of Compact Radio Continuum toward Methanol Maser Rings Using the VLA

The Astrophysical Journal
High-mass protostars are deeply embedded in dust inside their natal cores and are not easily detectable. However, maser emission at centimeter wavelengths, owing to its high brightness, enables us to study gas kinematics in protostars’ circumstellar ...
Anna Bartkiewicz, Olga Bayandina, Alberto Sanna, Marian Szymczak, Luca Moscadelli, Agnieszka Kobak, Huib Jan van Langevelde, Ashwin Varma   +7 more
doaj   +1 more source

Chemical Evolution of Protostars [PDF]

Astrophysics and Space Science, 2005
This review discusses the evolution of the chemical composition of the molecular gas throughout the process of star formation. It covers the initial stages of cloud-core formation, gravitational collapse and the formation of the star, the effects of stellar radiation and outflows on the surrounding cloud, and the composition of the circumstellar disk ...
openaire   +1 more source

Investigating Protostellar Accretion-driven Outflows across the Mass Spectrum: JWST NIRSpec Integral Field Unit 3–5 μm Spectral Mapping of Five Young Protostars

The Astrophysical Journal
Investigating Protostellar Accretion is a Cycle 1 JWST program using the NIRSpec+MIRI integral field units to obtain 2.9–28 μ m spectral cubes of five young protostars with luminosities of 0.2–10,000 L _⊙ in their primary accretion phase.
Samuel A. Federman, S. Thomas Megeath, Adam E. Rubinstein, Robert Gutermuth, Mayank Narang, Himanshu Tyagi, P. Manoj, Guillem Anglada, Prabhani Atnagulov, Henrik Beuther, Tyler L. Bourke, Nashanty Brunken, Alessio Caratti o Garatti, Neal J. Evans II, William J. Fischer, Elise Furlan, Joel D. Green, Nolan Habel, Lee Hartmann, Nicole Karnath, Pamela Klaassen, Hendrik Linz, Leslie W. Looney, Mayra Osorio, James Muzerolle Page, Pooneh Nazari, Riwaj Pokhrel, Rohan Rahatgaonkar, Will R. M. Rocha, Patrick Sheehan, Katerina Slavicinska, Thomas Stanke, Amelia M. Stutz, John J. Tobin, Lukasz Tychoniec, Ewine F. Van Dishoeck, Dan M. Watson, Scott Wolk, Yao-Lun Yang   +38 more
doaj   +1 more source