Detection of Vibrationally Excited CO in IRC+10216Using the Submillimeter Array we have detected the J=3-2 and 2-1 rotational transitions from within the first vibrationally excited state of CO toward the extreme carbon star IRC+10216 (CW Leo). The…Nimesh A. Patel, Ken H. Young, Sandra Brünken et al.·Nov 28, 2008SaveLearn
Swift follow-up observations of 17 INTEGRAL sources of uncertain or unknown nature(abridged) We analysed data from observations of 17 INTEGRAL sources made with the Swift satellite. We refine the position of the hard X-ray sources to an accuracy of a few arcsec. We then browsed…J. Rodriguez, J. A. Tomsick, S. Chaty·Nov 28, 2008SaveLearn
2.5-dimensional solution of the advective accretion disk: A self-similar approachWe provide a 2.5-dimensional solution to a complete set of viscous hydrodynamical equations describing accretion-induced outflow and then plausible jet around black holes/compact objects. We…Shubhrangshu Ghosh, Banibrata Mukhopadhyay·Nov 28, 2008SaveLearn
Rapid Formation of Icy Super-Earths and the Cores of Gas Giant PlanetsWe describe a coagulation model that leads to the rapid formation of super-Earths and the cores of gas giant planets. Interaction of collision fragments with the gaseous disk is the crucial element…Scott J. Kenyon, Benjamin C. Bromley·Nov 28, 2008SaveLearn
Complete nucleosynthesis calculations for low-mass stars from NuGridMany nucleosynthesis and mixing processes of low-mass stars as they evolve from the Main Sequence to the thermal-pulse Asymptotic Giant Branch phase (TP-AGB) are well understood (although of course…Marco Pignatari, Falk Herwig, Michael Bennett et al.·Nov 28, 2008SaveLearn
Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion ModelsWe examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D explosion models and…Patrick Young, Carola I. Ellinger, Francis X. Timmes et al.·Nov 28, 2008SaveLearn
NuGrid: s process in massive starsThe s-process production in massive stars at very low metallicities is expected to be negligible due to the low abundance of the neutron source 22Ne, to primary neutron poisons and decreasing iron…Raphael Hirschi, Urs Frischknecht, F. -K. Thielemann et al.·Nov 28, 2008SaveLearn
Nucleosynthesis simulations for a wide range of nuclear production sites from NuGridSimulations of nucleosynthesis in astrophysical environments are at the intersection of nuclear physics reaction rate research and astrophysical applications, for example in the area of galactic…Falk Herwig, Michael Bennett, Steven Diehl et al.·Nov 28, 2008SaveLearn
44Ti and 56Ni in core-collapse supernovaeWe investigate the physical conditions where 44Ti and 56Ni are created in core-collapse supernovae. In this preliminary work we use a series of post-processing network calculations with parametrized…Georgios Magkotsios, Francis X. Timmes, Michael Wiescher et al.·Nov 28, 2008SaveLearn
Nucleosynthetic Yields from "Collapsars"The "collapsar" engine for gamma-ray bursts invokes as its energy source the failure of a normal supernova and the formation of a black hole. Here we present the results of the first…Gabriel Rockefeller, Christopher L. Fryer, Patrick Young et al.·Nov 28, 2008SaveLearn
Nucleosynthesis Calculations from Core-Collapse SupernovaeWe review some of the uncertainties in calculating nucleosynthetic yields, focusing on the explosion mechanism. Current yield calculations tend to either use a piston, energy injection, or…Christopher L. Fryer, Patrick Young, Michael Bennett et al.·Nov 28, 2008SaveLearn
NuGrid: Toward High Precision Double-Degenerate Merger Simulations with SPH in 3DWe present preliminary results from recent high-resolution double-degenerate merger simulations with the Smooth Particle Hydrodynamics (SPH) technique. We put particular emphasis on verification and…Steven Diehl, Christopher L. Fryer, Aimee Hungerford et al.·Nov 28, 2008SaveLearn
Difficulties in Probing Nuclear Physics: A Study of 44Ti and 56NiThe nucleosynthetic yield from a supernova explosion depends upon a variety of effects: progenitor evolution, explosion process, details of the nuclear network, and nuclear rates. Especially in…Aimee Hungerford, Christopher L. Fryer, Francis X. Timmes et al.·Nov 28, 2008SaveLearn
Dynamic non-null magnetic reconnection in three dimensions - II. Composite solutionsIn this series of papers we examine magnetic reconnection in a domain where the magnetic field does not vanish and the non-ideal region is localised in space. In a previous paper we presented a…A. L. Wilmot-Smith, G. Hornig, E. R. Priest·Nov 28, 2008SaveLearn
Direct Simulations of Particle Acceleration in Fluctuating Electromagnetic Field across a ShockWe simulate the acceleration processes of collisionless particles in a shock structure with magnetohydrodynamical (MHD) fluctuations. The electromagnetic field is represented as a sum of MHD shock…Takayuki Muranushi, Shu-ichiro Inutsuka·Nov 28, 2008SaveLearn
Angular correlations in the cosmic gamma-ray background from dark matter annihilation around intermediate-mass black holesDark matter (DM) annihilation could in principle contribute to the diffuse cosmic gamma-ray back- ground (CGB). While with standard assumptions for cosmological and particle physics parameters this…Marco Taoso, Shin'ichiro Ando, Gianfranco Bertone et al.·Nov 28, 2008SaveLearn
Primordial Nucleosynthesis: an updated comparison of observational light nuclei abundances with theoretical predictionsAn up to date review of Standard Big Bang Nucleosynthesis predictions vs the astrophysical estimates of light nuclei abundances is here presented. In particular the analysis reports the expected…G. Miele, O. Pisanti·Nov 28, 2008SaveLearn
Braneworlds with timelike extra-dimensionIn this work, we consider a braneworld model with a timelike extra-dimension. There are strong constraints to the parameter values of such a model resulting from the claim that there must be a…Marina Seikel, Max Camenzind·Nov 27, 2008SaveLearn
Chandra and Swift observations of the quasi-persistent neutron star transient EXO 0748-676 back to quiescenceThe quasi-persistent neutron star X-ray transient and eclipsing binary EXO 0748-676 recently started the transition to quiescence following an accretion outburst that lasted more than 24 years. We…N. Degenaar, R. Wijnands, M. T. Wolff et al.·Nov 27, 2008SaveLearn
Bayesian analysis of the backreaction modelsWe present the Bayesian analysis of four different types of backreation models, which are based on the Buchert equations. In this approach, one considers a solution to the Einstein equations for a…Aleksandra Kurek, Krzysztof Bolejko, Marek Szydlowski·Nov 27, 2008SaveLearn
On the growth and stability of Trojan planetsWe investigate the stability of those low-mass Trojan planets that form in a protoplanetary disc and subsequently accrete gas to become gas giants. We calculate their evolution before, during, and…Paul Cresswell, Richard P. Nelson·Nov 27, 2008SaveLearn
The Hubble flow around the Local GroupWe use updated data on distances and velocities of galaxies in the proximity of the Local Group (LG) in order to establish properties of the local Hubble flow. For 30 neighbouring galaxies with…I. D. Karachentsev, O. G. Kashibadze, D. I. Makarov et al.·Nov 27, 2008SaveLearn
The Barium Isotopic Abundance in the Metal-Poor Star HD140283We derive the mixture of odd to even barium isotopes in the atmosphere of the metal-poor subgiant HD140283 from the analysis of the Ba II transition at 455.4 nm in a high-resolution high…R. Collet, M. Asplund, P. E. Nissen·Nov 27, 2008SaveLearn
On burning regimes and long duration X-ray burstsHydrogen and helium accreted onto a neutron star undergo thermonuclear burning. Explosive burning is observed as a type I X-ray burst. We describe the different burning regimes and focus on some of…L. Keek, J. J. M. in 't Zand·Nov 27, 2008SaveLearn
Possible creation of net circular polarization and not only depolarization of spectral lines by isotropic collisionsWe will show that isotropic collisions of electrons and protons with neutral hydrogen can lead to creation of net orientation of the atomic levels in the presence of a magnetic field. Consequently,…Jiri Stepan, Sylvie Sahal-Brechot·Nov 27, 2008SaveLearn