Results 11 to 20 of about 55,496 (241)

Particle confinement in a non-axisymmetric protoplanetary nebula [PDF]

Open Astronomy, 1999
Fuente Marcos C. de la, Barge P.
doaj   +4 more sources

Toward Planetesimals: Dense Chondrule Clumps in the Protoplanetary Nebula [PDF]

The Astrophysical Journal, 2008
We outline a scenario that traces a direct path from freely floating nebula particles to the first 10-100 km sized bodies in the terrestrial planet region, producing planetesimals that have properties matching those of primitive meteorite parent bodies ...
J. Cuzzi, R. Hogan, K. Shariff
semanticscholar   +7 more sources

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.
Y. Choi, A. Brunthaler, K. Menten, M. Reid   +3 more
semanticscholar   +7 more sources

Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy [PDF]

Astronomy Letters, 2017, V 43, Issue 7, 452, 2017
The catalogue of protoplanetary nebulae by Vickers et al. has been supplemented with the line-of-sight velocities and proper motions of their central stars from the literature. Based on an exponential density distribution, we have estimated the vertical scale height from objects with an age less than 3 Gyr belonging to the Galactic thin disk ...
Anisa T. Bajkova, Vadim V. Bobylev
arxiv   +5 more sources

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.
Giovanni Leone, Hiroyuki Tanaka
doaj   +2 more sources

Fast accretion of small planetesimals by protoplanetary cores [PDF]

Astron.J. 128 (2003) 1348, 2003
We explore the dynamics of small planetesimals coexisting with massive protoplanetary cores in a gaseous nebula. Gas drag strongly affects the motion of small bodies leading to the decay of their eccentricities and inclinations, which are excited by the gravity of protoplanetary cores. Drag acting on larger ($\gtrsim 1$ km), high velocity planetesimals
Greenberg J. M., Hasegawa M., Ida S., R. R. Rafikov, Weidenschilling S. J.   +4 more
arxiv   +4 more sources

Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-resolution ALMA Observations [PDF]

Astrophysical Journal, 2018
We present Atacama Large Millimeter Array 850 μm continuum observations of the Orion Nebula Cluster that provide the highest angular resolution (∼0.″1 ≈ 40 au) and deepest sensitivity (∼0.1 mJy) of the region to date. We mosaicked a field containing ∼225
J. Eisner, H. Arce, N. Ballering, J. Bally, S. Andrews, R. Boyden, J. Francesco, M. Fang, D. Johnstone, J. Kim, R. Mann, B. Matthews, I. Pascucci, L. Ricci, P. Sheehan, J. Williams   +15 more
semanticscholar   +2 more sources

Chemistry in Externally FUV-irradiated Disks in the Outskirts of the Orion Nebula Cluster [PDF]

The Astrophysical Journal
Most stars are born in stellar clusters, and their protoplanetary disks, which are the birthplaces of planets, can, therefore, be affected by the radiation of nearby massive stars.
Javiera K. Díaz-Berríos, Viviana V. Guzmán, Catherine Walsh, Karin I. Öberg, L. Ilsedore Cleeves, Elizabeth Artur de la Villarmois, John Carpenter   +6 more
doaj   +2 more sources

The cometary composition of a protoplanetary disk as revealed by complex cyanides [PDF]

Nature, 520, 7546, 198, 2015, 2015
Observations of comets and asteroids show that the Solar Nebula that spawned our planetary system was rich in water and organic molecules. Bombardment brought these organics to the young Earth's surface, seeding its early chemistry. Unlike asteroids, comets preserve a nearly pristine record of the Solar Nebula composition.
A Dutrey, A Dutrey, C Brinch, C Favre, C Qi, C Qi, C Qi, C Walsh, C Walsh, C Walsh, C Walsh, Chunhua Qi, D Lynden-Bell, D Semenov, David J. Wilner, DM Graninger, DP O’Brien, E Bergin, E Dartois, E Herbst, EC Fayolle, EF van Dishoeck, EF van Dishoeck, EI Chiang, FJ Ciesla, GM Muñoz Caro, H Nomura, JS Carr, K Furuya, K Tsiganis, KA Rosenfeld, Karin I. Öberg, Kenji Furuya, KI Öberg, KI Öberg, KI Öberg, KJ Walsh, KM Pontoppidan, L Hartmann, LI Cleeves, LI Cleeves, M Dubernet, M Simon, M Takami, M Wernli, MJ Mumma, MP Collings, MR Hogerheijde, N Goldman, N Sakai, P D'Alessio, P Gratier, P Hartogh, RT Garrod, Ryan Loomis, S Guilloteau, S Pizzarello, Sean M. Andrews, T Yamamoto, V Piétu, V Wakelam, Viviana V. Guzmán, Y Aikawa, Y Aikawa, Yuri Aikawa   +64 more
arxiv   +3 more sources

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
doaj   +2 more sources