Results 71 to 80 of about 55,496 (241)
The Integral Field View of the Orion Nebula
Advances in Astronomy, 2014 This paper reviews the major advances achieved in the Orion Nebula through the use of integral field spectroscopy (IFS). Since the early work of Vasconcelos and collaborators in 2005, this technique has facilitated the investigation of global properties ...
Adal Mesa-Delgado
doaj +1 more source
Origin of Low-26Al/27Al Corundum/Hibonite Inclusions in Meteorites
The Astrophysical Journal, 2023 Most meteoritic calcium-rich, aluminum-rich inclusions formed from a reservoir with ^26 Al/ ^27 Al ≈ 5 × 10 ^−5 , but some record lower ${({}^{26}\mathrm{Al}/{}^{27}\mathrm{Al})}_{0}$ , demanding they sampled a reservoir without live ^26 Al.
Steven J. Desch +7 more
doaj +1 more source
The Astrophysical Journal, 2023 We continue to investigate long-term protoplanetary disk evolution and focus on the situation of strong disk self-gravity (DSG). We call such a disk a type III disk. A large amount of mass is stored in the disk due to large angular momentum.
Xin-Ming Wang
doaj +1 more source
Depletion of Moderately Volatile Elements by Open-System loss in the Early Solar Nebula [PDF]
, 2022 Rocky bodies of the inner solar system display a systematic depletion of the "Moderately Volatile Elements" (MVEs) that correlates with the expected condensation temperature of their likely host materials under protoplanetary nebula conditions. In this paper, we present and test a new hypothesis in which open system loss processes irreversibly remove ...
arxiv +1 more source
Mass inventory of the giant-planet formation zone in a solar nebula analog [PDF]
, 2017 The initial mass distribution in the solar nebula is a critical input to planet formation models that seek to reproduce today's Solar System. Traditionally, constraints on the gas mass distribution are derived from observations of the dust emission from ...
Bergin, Edwin A. +4 more
core +3 more sources
Magnetic fields in protoplanetary disks
, 2007 Magnetic fields likely play a key role in the dynamics and evolution of protoplanetary discs. They have the potential to efficiently transport angular momentum by MHD turbulence or via the magnetocentrifugal acceleration of outflows from the disk surface,
A. Johansen +44 more
core +1 more source
Fullerenes, PAHs, Amino Acids and High Energy Astrophysics
Acta Polytechnica CTU Proceedings, 2014 We present theoretical, observational and laboratory work on the spectral properties of fullerenes and hydrogenated fullerenes. Fullerenes in its various forms (individual, endohedral, hydrogenated, etc.) can contribute to the UV bump in the extinction ...
Susana Iglesias-Groth
doaj +1 more source
The Evolution of the Water Distribution in a Viscous Protoplanetary Disk
, 2005 (Abridged) Astronomical observations have shown that protoplanetary disks are dynamic objects through which mass is transported and accreted by the central star.
Ciesla, Fred J., Cuzzi, Jeffrey N.
core +2 more sources
The shaping effect of collimated fast outflows in the Egg nebula [PDF]
Astrophys.J.698:439-444,2009, 2008 We present high angular resolution observations of the HC$_3$N J=5--4 line from the Egg nebula, which is the archetype of protoplanetary nebulae. We find that the HC$_{\rm 3}$N emission in the approaching and receding portion of the envelope traces a clumpy hollow shell, similar to that seen in normal carbon rich envelopes.
arxiv +1 more source
On the orbital evolution and growth of protoplanets embedded in a gaseous disc [PDF]
, 1999 We present a new computation of the linear tidal interaction of a protoplanetary core with a thin gaseous disc in which it is fully embedded. For the first time a discussion of the orbital evolution of cores with eccentricity (e) significantly larger ...
Larwood, J. D., Papaloizou, J. C. B.
core +3 more sources