Results 11 to 20 of about 9,190 (204)

An Outbursting Protostar: The Environment of L1251 VLA 6 [PDF]

The Astrophysical Journal
Young protostars that undergo episodic accretion can provide insight into the impact on their circumstellar environments while matter is accreted from the disk onto the protostar.
Ava Nederlander, Adele Plunkett, Antonio Hales, Ágnes Kóspál, Jacob A. White, Makoto A. Johnstone, Mária Kun, Péter Ábrahám, Anna G. Hughes   +8 more
doaj   +4 more sources

The ALMA-PILS survey: first detection of methyl isocyanide (CH3NC) in a solar-type protostar [PDF]

Astronomy & Astrophysics, 2018
Context. Methyl isocyanide (CH3NC) is the isocyanide with the largest number of atoms confirmed in the interstellar medium (ISM), but it is not an abundant molecule, having only been detected towards a handful of objects.
H. Calcutt, M. Fiechter, E. Willis, H. S. P. Müller, R. Garrod, J. Jørgensen, S. Wampfler, T. Bourke, A. Coutens, M. Drozdovskaya, N. Ligterink, L. Kristensen   +11 more
semanticscholar   +3 more sources

CORINOS. I. JWST/MIRI Spectroscopy and Imaging of a Class 0 Protostar IRAS 15398–3359 [PDF]

Astrophysical Journal Letters, 2022
The origin of complex organic molecules (COMs) in young Class 0 protostars has been one of the major questions in astrochemistry and star formation. While COMs are thought to form on icy dust grains via gas-grain chemistry, observational constraints on ...
Yao-lun Yang, J. Green, K. Pontoppidan, J. Bergner, L. Cleeves, N. Evans II, R. Garrod, M. Jin, Chul-Hwan Kim, Jaeyeon Kim, Jeong-Eun Lee, N. Sakai, C. Shingledecker, B. Shope, J. Tobin, E. V. van Dishoeck   +15 more
semanticscholar   +1 more source

PRODIGE - Envelope to disk with NOEMA I. A 3000 au streamer feeding a Class I protostar [PDF]

Astronomy & Astrophysics, 2022
Context. In the past few years, there has been a rise in the detection of streamers, asymmetric flows of material directed toward the protostellar disk with material from outside the star's natal core.
M. T. Valdivia-Mena, J. Pineda, D. Segura-Cox, P. Caselli, R. Neri, A. L'opez-Sepulcre, N. Cunningham, L. Bouscasse, D. Semenov, T. Henning, V. Pi'etu, E. Chapillon, A. Dutrey, A. Fuente, S. Guilloteau, T. Hsieh, I. Jim'enez-Serra, S. Marino, M. Maureira, G. Smirnov-Pinchukov, M. Tafalla, B. Zhao   +21 more
semanticscholar   +1 more source

Magnetically regulated collapse in the B335 protostar? II. Observational constraints on gas ionization and magnetic field coupling [PDF]

Astronomy & Astrophysics, 2022
Non-ideal magnetohydrodynamic effects that rule the coupling of the magnetic field to the circumstellar gas during the low-mass star formation process depend heavily on the local physical conditions, such as the ionization fraction of the gas.
V. Cabedo, A. Maury, J. Girart, M. Padovani, P. Hennebelle, M. Houde, Qizhou Zhang   +6 more
semanticscholar   +1 more source

“Ashfall” Induced by Molecular Outflow in Protostar Evolution [PDF]

, 2021
Dust growth and its associated dynamics play key roles in the first phase of planet formation in young stellar objects. Observations have detected signs of dust growth in very young protoplanetary disks.
Y. Tsukamoto, M. Machida, S. Inutsuka
semanticscholar   +1 more source

On the forms of accretion of interstellar gas and dust during the formation of single stars and their planetary systems

Open Astronomy, 2021
In this paper, the mechanisms of star formation and the formation of the equatorial gas and dust disk of protostars are considered. The viscous dynamics of the interstellar matter of gas and dust disks is mainly determined by perturbations of the matter ...
Abdulmyanov Tagir
doaj   +1 more source

The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. IV. Unveiling the Embedded Intermediate-Mass Protostar and Disk within OMC2-FIR3/HOPS-370 [PDF]

Astrophysical Journal, 2020
We present ALMA (0.87 and 1.3 mm) and VLA (9 mm) observations toward the candidate intermediate-mass protostar OMC2-FIR3 (HOPS-370; L bol ∼ 314 L ⊙) at ∼01 (40 au) resolution for the continuum emission and ∼025 (100 au) resolution of nine molecular lines.
J. Tobin, P. Sheehan, N. Reynolds, S. Megeath, M. Osorio, G. Anglada, A. K. Díaz-Rodríguez, E. Furlan, K. Kratter, S. Offner, L. Looney, M. Kama, Zhi-Yun Li, M. V. ’. van ’t Hoff, S. Sadavoy, N. Karnath   +15 more
semanticscholar   +1 more source

Disk Structure around the Class I Protostar L1489 IRS Revealed by ALMA: A Warped-disk System [PDF]

Astrophysical Journal, 2020
We have observed the Class I protostar L1489 IRS with the Atacama Millimeter/submillimeter Array (ALMA) in Band 6. The C18O J = 2–1 line emission shows flattened and non-axisymmetric structures in the same direction as its velocity gradient due to ...
Jinshi Sai, N. Ohashi, K. Saigo, Tomoaki Matsumoto, Yusuke Aso, S. Takakuwa, Y. Aikawa, Ippei Kurose, Hsi-Wei Yen, K. Tomisaka, K. Tomida, M. Machida   +11 more
semanticscholar   +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