Results 61 to 70 of about 55,496 (241)
Evolution of protoplanetary nebulae
The Astrophysical Journal, 1989 Model spectra of protoplanetary nebulae have been calculated assuming that mass loss on the asymptotic giant branch terminates when the hydrogen envelope is almost totally depleted. The models predict spectral characteristics of protoplanetary nebulae which can be used to search for new candidates of protoplanetary nebulae in the IRAS Low Resolution ...
Kevin Volk, Sun Kwok
openaire +2 more sources
The role of the initial surface density profiles of the disc on giant planet formation: comparing with observations [PDF]
, 2011 In order to explain the main characteristics of the observed population of extrasolar planets and the giant planets in the Solar System, we need to get a clear understanding of which are the initial conditions that allowed their formation. To this end we
A. Brunini +51 more
core +4 more sources
Dust photophoretic transport around a T Tauri star: Implications for comets composition [PDF]
, 2016 There is a growing body of evidences for the presence of crystalline material in comets. These crystals are believed to have been annealed in the inner part of the proto-solar nebula, while comets should have been formed in the outer regions.
Cordier, D. +2 more
core +4 more sources
A search for CO+ in planetary nebulae [PDF]
Mon.Not.Roy.Astron.Soc.382:1139-1144,2007, 2007 We have carried out a systematic search for the molecular ion CO+ in a sample of 8 protoplanetary and planetary nebulae in order to determine the origin of the unexpectedly strong HCO+ emission previously detected in these sources. An understanding of the HCO+ chemistry may provide direct clues to the physical and chemical evolution of planetary ...
arxiv +1 more source
Chemistry in Protoplanetary Disks [PDF]
, 2013 This comprehensive review summarizes our current understanding of the evolution of gas, solids and molecular ices in protoplanetary disks. Key findings related to disk physics and chemistry, both observationally and theoretically, are highlighted.
Henning, Thomas, Semenov, Dmitry
core +1 more source
A SUBMILLIMETER ARRAY SURVEY OF PROTOPLANETARY DISKS IN THE ORION NEBULA CLUSTER [PDF]
The Astrophysical Journal, 2010 Accepted for publication in ApJ, 36 pages, 10 ...
Rita K. Mann, Jonathan P. Williams
openalex +5 more sources
Breathing Life Into Dead-Zones
EPJ Web of Conferences, 2013 The terrestrial planet formation regions of protoplanetary disks are generally sufficiently cold to be con- sidered non-magnetized and, consequently, dynamically inactive.
Gressel Oliver +2 more
doaj +1 more source
Isolating Dust and Free–Free Emission in ONC Proplyds with ALMA Band 3 Observations
The Astrophysical Journal, 2023 The Orion Nebula Cluster (ONC) hosts protoplanetary disks experiencing external photoevaporation by the cluster’s intense UV field. These “proplyds” are comprised of a disk surrounded by an ionization front.
Nicholas P. Ballering +8 more
doaj +1 more source
Mechanical Modification of Chondrule Fine-grained Rims by Dusty Nebular Shocks
The Planetary Science Journal, 2023 The mechanical processes that convert an initially fluffy chondrule fine-grained rim (FGR) into a more compact structure remain poorly characterized.
Augusto Carballido +3 more
doaj +1 more source
A REMODEL OF THE ENVELOPE AROUND THE 21 μm PROTOPLANETARY NEBULA IRAS 07134+1005 [PDF]
, 2011 Recently, the CO J = 3–2 observational result of the envelope of the 21 μm protoplanetary nebula (PPN) IRAS 07134+1005 has been reported. Assuming that the CO J = 3–2 line was optically thin, the mass-loss rate of the superwind in this PPN was found to ...
ChunYi Yang, Chin-Fei Lee
semanticscholar +1 more source