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Astrophysics papers — page 163

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Ranges of Atmospheric Mass and Composition of Super Earth Exoplanets
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model…
L. Elkins-Tanton, S. SeagerAug 13, 2008
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Coreless Terrestrial Exoplanets
Differentiation in terrestrial planets is expected to include the formation of a metallic iron core. We predict the existence of terrestrial planets that have differentiated but have no metallic…
L. Elkins-Tanton, S. SeagerAug 13, 2008
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The Atmospheric Signatures of Super-Earths: How to Distinguish Between Hydrogen-Rich and Hydrogen-Poor Atmospheres
Extrasolar super-Earths (1-10 M) are likely to exist with a wide range of atmospheres. Some super-Earths may be able to retain massive hydrogen-rich atmospheres. Others might never…
E. Miller-Ricci, D. Sasselov, S. SeagerAug 13, 2008
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A Bursting Radio Transient in the Direction of the Galactic Center
The radio sky is poorly sampled for rapidly varying transients because of the narrow field-of-view of most imaging radio telescopes at cm and shorter wavelengths. The emergence of sensitive long…
Paul S. Ray, Scott D. Hyman, T. Joseph Lazio et al.Aug 13, 2008
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Mid-infrared spectra of optically selected type 2 quasars
Type 2 quasars are luminous Active Galactic Nuclei whose central engines are seen through large amounts of gas and dust. We present Spitzer spectra of twelve type 2 quasars selected on the basis of…
Nadia L. Zakamska, Laura Gomez, Michael A. Strauss et al.Aug 13, 2008
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Constraining Orbital Parameters Through Planetary Transit Monitoring
The orbital parameters of extra-solar planets have a significant impact on the probability that the planet will transit the host star. This was recently demonstrated by the transit detection of HD…
Stephen R. Kane, Kaspar von BraunAug 13, 2008
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On The Origin of the Blue Tilt in Extragalactic Globular Cluster Systems
Some early-type galaxies show a correlation between color and integrated magnitude among the brighter metal-poor globular clusters (GCs). This phenomenon, known as the blue tilt, implies a…
Jay Strader, Graeme SmithAug 13, 2008
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B-Pol: Detecting Primordial Gravitational Waves Generated During Inflation
B-Pol is a medium-class space mission aimed at detecting the primordial gravitational waves generated during inflation through high accuracy measurements of the Cosmic Microwave Background (CMB)…
Paolo de Bernardis, Martin Bucher, Carlo Burigana et al.Aug 13, 2008
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The NuMoon experiment: first results
The NuMoon project uses the Westerbork Synthesis Radio Telescope to search for short radio pulses from the Moon. These pulses are created when an ultra high energy cosmic ray or neutrino initiates a…
S. Buitink, J. Bacelar, R. Braun et al.Aug 13, 2008
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Chemical evolution of the Magellanic Clouds based on planetary nebulae
Planetary nebulae (PN) are an essential tool in the study of the chemical evolution of the Milky Way and galaxies of the Local Group, particularly the Magellanic Clouds. In this work, we present some…
W. J. Maciel, R. D. D. Costa, T. E. P. IdiartAug 13, 2008
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Comments on Accretion of Phantom Fields by Black Holes and the Generalized Second Law
The thermodynamic properties of a phantom fluid and accretion by a black hole were recently revisited by Pereira (2008) and Lima et al. (2008). In order to keep positive both the entropy and the…
J. A. de Freitas PachecoAug 13, 2008
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Luminosity-Colours relations for thin disc main-sequence stars
In this study we present the absolute magnitude calibrations of thin disc main-sequence stars in the optical (MV), and in the near-infrared (MJ). Thin disc stars are identified by means of…
S. Bilir, S. Karaali, S. Ak et al.Aug 13, 2008
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A test suite for quantitative comparison of hydrodynamics codes in astrophysics
We test four commonly used astrophysical simulation codes; Enzo, Flash, Gadget and Hydra, using a suite of numerical problems with analytic initial and final states. Situations similar to the…
Elizabeth J. Tasker, Riccardo Brunino, Nigel L. Mitchell et al.Aug 13, 2008
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The Morphology of Collisionless Galactic Rings Exterior to Evolving Bars
The morphology of the outer rings of early-type spiral galaxies is compared to integrations of massless collisionless particles initially in nearly circular orbits. Particles are perturbed by a…
Micaela Bagley, Ivan Minchev, Alice C. QuillenAug 13, 2008
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Velocity Curve Analysis of the Spectroscopic Binary Stars NSV 223, AB And, V2082 Cyg, HS Her, V918 Her, BV Dra, BW Dra, V2357 Oph, and YZ Cas by the Non-linear Least Squares
Using measured radial velocity data of nine double lined spectroscopic binary systems NSV 223, AB And, V2082 Cyg, HS Her, V918 Her, BV Dra, BW Dra, V2357 Oph, and YZ Cas, we find corresponding…
K. Karami, R. Mohebi, M. M. SoltanzadehAug 13, 2008
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Diffusion of cosmic-rays and the Gamma-ray Large Area Telescope: Phenomenology at the 1-100 GeV regime
This paper analyzes astrophysical scenarios that may be detected at the upper end of the energy range of the Gamma Ray Large Area Space Telescope (GLAST), as a result of cosmic-ray (CR) diffusion in…
Ana Y. Rodriguez Marrero, Diego F. Torres, Elsa de Cea del Pozo et al.Aug 13, 2008
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First bounds on the high-energy emission from isolated Wolf-Rayet binary systems
High-energy gamma-ray emission is theoretically expected to arise in tight binary star systems (with high mass loss and high velocity winds), although the evidence of this relationship has proven to…
MAGIC Collaboration, E. AliuAug 13, 2008
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Near-Infrared Photometry and Radio Continuum Study of the Massive Star Forming Regions IRAS 21413+5442 and IRAS 21407+5441
IRAS 21413+5442 and IRAS 21407+5441 are two massive star forming regions of high luminosity, likely associated with each other. Near-infrared photometry on these two IRAS sources was performed at…
B. G. Anandarao, V. Venkata Raman, S. K. Ghosh et al.Aug 13, 2008
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The NGC 672 and NGC 784 Galaxy Groups: Evidence for Galaxy Formation and Growth Along a Nearby Dark Matter Filament
(Abridged): We present U, B, V, R, I, H-alpha and NUV photometry of 14 galaxies in the very local Universe (within 10 Mpc that are dwarf irregular galaxies (dIrr), are at low redshift (51<v<610…
Adi Zitrin, Noah BroschAug 13, 2008
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The structure and dynamics of young star clusters: King 16, NGC 1931, NGC 637 and NGC 189
In this paper, using 2MASS photometry, we study the structural and dynamical properties of four young star clusters viz. King 16, NGC 1931, NGC 637 and NGC 189. For the clusters King 16, NGC 1931,…
Priya Hasan, S N Hasan, Urmi ShahAug 13, 2008
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Spectroscopic Confirmation of the Fifth Image of SDSS J1004+4112 and Implications for the MBH-sigma* Relation at z=0.68
We present the results of deep spectroscopy for the central region of the cluster lens SDSS J1004+4112 with the Subaru telescope. A secure detection of an emission line of the faint blue stellar…
Naohisa Inada, Masamune Oguri, Emilio E. Falco et al.Aug 13, 2008
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Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
Field star BD+20 307 is the dustiest known main sequence star, based on the fraction of its bolometric luminosity, 4%, that is emitted at infrared wavelengths. The particles that carry this large IR…
B. Zuckerman, Francis C. Fekel, Michael H. Williamson et al.Aug 13, 2008
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CMB polarimetry with BICEP: instrument characterization, calibration, and performance
BICEP is a ground-based millimeter-wave bolometric array designed to target the primordial gravity wave signature on the polarization of the cosmic microwave background (CMB) at degree angular…
Yuki D. Takahashi, Denis Barkats, John O. Battle et al.Aug 13, 2008
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Particle Acceleration in Solar Flares and Enrichment of 3He and Heavy Ions
We discuss possible mechanisms of acceleration of particles in solar flares and show that turbulence plays an important role in all the mechanism. It is also argued that stochastic particle…
Vahe' PetrosianAug 13, 2008
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Is "Spike" a Reliable Feature in Porb Distribution of AM HER Stars?
Orbital periods in AM Her stars (polars) are synchronized with spin periods of white dwarf by its high magnetic field. Since the last study of Porb distribution of these systems, the number of known…
Alex Golovin, Mykola Malygin, Elena PavlenkoAug 12, 2008
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