Results 11 to 20 of about 536 (176)

Dynamics and Growth of Dust Grains in the Protoplanetary Nebula [PDF]

Publications of the Astronomical Society of the Pacific, 2002
In the standard scenario of planet formation, the planetesimals grow from primordial dust grains of interstellar origin embedded in a gas disk, the so-called protoplanetary nebula. Large-scale gaseous structures, such as spiral waves and vortices, are likely to survive for a large number of rotation periods and can strongly influence the dynamics and ...
C. de la Fuente Marcos
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Igneous processes in the small bodies of the Solar System II: Small satellites and dwarf planets. [PDF]

iScience
Summary: Evidence of hot and cold igneous processes has been reported in small satellites and dwarf planets of the Solar System. Olivine and pyroxenes were detected in the spectral bands of both small satellites and dwarf planets.
Leone G, Tanaka H.
europepmc   +2 more sources

Condensation Front Migration in a Protoplanetary Nebula [PDF]

The Astrophysical Journal, 2005
Condensation front dynamics are investigated in the mid-solar nebula region. A quasi-steady model of the evolving nebula is combined with equilibrium vapor pressure curves to determine evolutionary condensation fronts for selected species. These fronts are found to migrate inwards from the far-nebula to final positions during a period of 10(exp 7 ...
Sanford S. Davis
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UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS [PDF]

Galaxies, 2018
Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase.
Xuan Fang, Martín A. Guerrero, Ana I. Gómez de Castro, Jesús A. Toalá, Bruce Balick, Angels Riera   +5 more
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Evidence for Magnetically‐Driven Accretion in the Distal Solar System

AGU Advances
Paleomagnetic measurements of meteorites indicate that magnetic fields existed in the inner solar nebula capable of driving accretion at rates similar to those observed for young stellar objects with protoplanetary disks.
Elias N. Mansbach, Benjamin P. Weiss, Eduardo A. Lima, Michael Sowell, Joseph L. Kirschvink, Roger R. Fu, Saverio Cambioni, Xue‐Ning Bai, Jodie B. Ream, Chisato Anai, Atsuko Kobayashi, Hironori Hidaka   +11 more
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Trigonometric parallax of the protoplanetary nebula OH 231.8+4.2 [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractWe report trigonometric parallx measurements for H2O masers around the protoplanetary nebula OH 231.8+4.2 carried out with the Very Long Baseline Array. Based on astrometric monitoring for 1 year, we measured a trigonometric parallax of 0.89 ± 0.04 mas, corresponding to a distance of 1.12+0.05−0.05 kpc.
Yoon Kyung Choi, A. Brunthaler, K. M. Menten, M. J. Reid   +3 more
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Molecules in the Carbon-rich Protoplanetary Nebula CRL 2688 [PDF]

The Astrophysical Journal Supplement Series, 2022
Abstract We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our knowledge, 153 transition lines
Jianjie Qiu, Yong Zhang, J. S. Zhang, Jun‐ichi Nakashima   +3 more
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Toward Planetesimals: Dense Chondrule Clumps in the Protoplanetary Nebula [PDF]

The Astrophysical Journal, 2008
Astrophys.
Jeffrey N. Cuzzi, R. C. Hogan, Karim Shariff   +2 more
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Small Protoplanetary Disks in the Orion Nebula Cluster and OMC1 with ALMA [PDF]

The Astrophysical Journal, 2021
Abstract The Orion Nebula Cluster (ONC) is the nearest dense star-forming region at ∼400 pc away, making it an ideal target to study the impact of high stellar density and proximity to massive stars (the Trapezium) on protoplanetary disk evolution.
Justin A. Otter, Adam Ginsburg, Nicholas P. Ballering, John Bally, J. A. Eisner, C. Goddi, R. L. Plambeck, M. C. H. Wright   +7 more
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How unique is the protoplanetary nebula star HR 4049? [PDF]

Symposium - International Astronomical Union, 1987
The late B-supergiant HR 4049 is peculiar in different respects: (1) It is located far from the galactic plane (b = 23°); (2) It is a variable with a large amplitude and on a long time scale (Waelkens and Rufener, 1983); (3) It has a spectacular infrared excess (Lamers et al., 1986).
C. Waelkens, L. B. F. M. Waters
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