What do stars tell us about planets? Asteroseismology of exoplanet-host starsStudying the internal structure of exoplanet-host stars compared to that of similar stars without detected planets is particularly important for the understanding of planetary formation. The observed…Sylvie Vauclair·Sep 1, 2008SaveLearn
Abundance profiles in cooling-core clusters: a fossil record of past AGN-driven convection?Central peaks in the iron abundance of intracluster plasma are a common feature of cooling-core galaxy clusters. These abundance peaks have a much broader profile than the stars of the central…Yann Rasera, Bryan Lynch, Kushal Srivastava et al.·Sep 1, 2008SaveLearn
Satellite dynamics on the Laplace surfaceThe orbital dynamics of most planetary satellites is governed by the quadrupole moment from the equatorial bulge of the host planet and the tidal field from the Sun. On the Laplace surface, the…Scott Tremaine, Jihad Touma, Fathi Namouni·Sep 1, 2008SaveLearn
Constraints on core-collapse supernova progenitors from correlations with H-alpha emissionWe present observational constraints on the nature of the different core-collapse supernova types through an investigation of the association of their explosion sites with recent star formation, as…J. P. Anderson, P. A. James·Sep 1, 2008SaveLearn
Cross section measurements of α-induced reactions on 92,94Mo and 112Sn for p-process studiesThe 92Mo(α,n)95Ru, 94Mo(α,n)97Ru, and 112Sn(α,γ)116Te cross sections were measured at the upper end of the p-process Gamow window between 8.2 MeV and 11.1 MeV.…W. Rapp, I. Dillmann, F. Käppeler et al.·Sep 1, 2008SaveLearn
Gamma-ray polarization constraints on Planck scale violations of special relativityUsing recent polarimetric observations of the Crab Nebula in the hard X-ray band by INTEGRAL, we show that the absence of vacuum birefringence effects constrains O(E/M) Lorentz violation in QED to…Luca Maccione, Stefano Liberati, Annalisa Celotti et al.·Sep 1, 2008SaveLearn
Dynamical tomography of gravitationally bound systemsWe study the inverse problem of deducing the dynamical characteristics (such as the potential field) of large systems from kinematic observations. We show that, for a class of steady-state systems,…Mikko Kaasalainen·Sep 1, 2008SaveLearn
Subspace Techniques for Radio-Astronomical Data EnhancementRadio astronomical observations have very poor signal to noise ratios, unlike in other disciplines. On the other hand, it is possible to observe the object of interest for long time intervals as well…Sarod Yatawatta·Sep 1, 2008SaveLearn
The Concepts of "Age" and "Universality" in Cosmic Ray ShowersThe concept of "age" as a parameter for the description of the state of development of high energy showers in the atmosphere has been in use in cosmic ray studies for several decades. In this…Paolo Lipari·Sep 1, 2008SaveLearn
Temporal variability of GRB early X-ray afterglows and GRB080319B prompt emissionWe performed the first systematic search for the minimum variability time scale between 0.3 and 10 keV studying the 28 brightest early (<3000 s) afterglows detected by Swift-XRT up to March 2008. We…R. Margutti, C. Guidorzi, G. Chincarini et al.·Sep 1, 2008SaveLearn
CoRoT and stellar activity: preliminary results from the modelling of CoRoT-Exo-2aWe present a preliminary analysis of the photospheric activity of CoRoT-Exo-2a, a young G7V star accompanied by a transiting hot Jupiter recently discovered by CoRoT. We apply spot modelling…A. F. Lanza, I. Pagano, G. Leto et al.·Sep 1, 2008SaveLearn
A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832Precision Doppler velocity measurements from the Anglo-Australian Tele- scope reveal a planet with a 9.4+/-0.4 year period orbiting the M1.5 dwarf GJ 832. Within measurement uncertainty the orbit is…Jeremy Bailey, R. Paul Butler, C. G. Tinney et al.·Sep 1, 2008SaveLearn
An Instability in Triaxial Stellar SystemsThe radial-orbit instability is a collective phenomenon that has heretofore only been observed in spherical systems. We find that this instability occurs also in triaxial systems, as we checked by…Fabio Antonini, Roberto Capuzzo-Dolcetta, David Merritt·Sep 1, 2008SaveLearn
Cosmological Models and Latest Observational DataIn this note, we consider the observational constraints on some cosmological models by using the 307 Union type Ia supernovae (SNIa), the 32 calibrated Gamma-Ray Bursts (GRBs) at z>1.4, the updated…Hao Wei·Aug 31, 2008SaveLearn
Imaging Observations of Quasi-Periodic Pulsatory Non-Thermal Emission in Ribbon Solar FlaresUsing RHESSI and some auxiliary observations we examine possible connections between spatial and temporal morphology of the sources of non-thermal hard X-ray (HXR) emission which revealed minute…I. V. Zimovets, A. B. Struminsky·Aug 31, 2008SaveLearn
What Hubble really meant by late and early type: simply more or less complex in appearanceIt is widely written and believed that Edwin Hubble introduced the terms `early' and `late types' to suggest an evolutionary sequence for galaxies. This is incorrect. Hubble took these terms…I. K. Baldry·Aug 31, 2008SaveLearn
X-ray Halo Around the Spiral Galaxy NGC 4631 Observed with SuzakuSuzaku observation of the edge-on spiral galaxy NGC 4631 confirmed its X-ray halo extending out to about 10 kpc from the galactic disk. The XIS spectra yielded the temperature and metal abundance for…Noriko Y. Yamasaki, Kosuke Sato, Ikuyuki Mitsuishi et al.·Aug 31, 2008SaveLearn
Chemical abundances of late-type pre-main sequence stars in the σ-Orionis clusterThe young σ-Orionis cluster is an important location for understanding the formation and evolution of stars, brown dwarfs, and planetary-mass objects. Its metallicity, although being a fundamental…J. I. González Hernández, J. A. Caballero, R. Rebolo et al.·Aug 30, 2008SaveLearn
A Radio Survey of Seven Southern X-ray Luminous Clusters of GalaxiesThe Australia Telescope Compact Array (ATCA) has been used at 1.38 and 2.38 GHz to survey seven southern Abell clusters of galaxies with high X-ray luminosities: A2746, A2837, A3126, A3216, A3230,…O. B. Slee, H. Andernach, V. J. McIntyre et al.·Aug 30, 2008SaveLearn
High redshift galaxy surveysA brief overview on the current status of the census of the early universe population is given. Observational surveys of high redshift galaxies provide direct opportunities to witness the cosmic dawn…Masanori Iye·Aug 30, 2008SaveLearn
The Masses of Transition Circumstellar Disks: Observational Support for Photoevaporation ModelsWe report deep Sub-Millimeter Array observations of 26 pre-main-sequence (PMS) stars with evolved inner disks. These observations measure the mass of the outer disk (r ~20-100 AU) across every stage…Lucas A. Cieza, Jonathan J. Swift, Geoffrey S. Mathews et al.·Aug 30, 2008SaveLearn
Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICMWe report about the detection of 10 clusters of galaxies in the ongoing Swift/BAT all-sky survey. This sample, which comprises mostly merging clusters, was serendipitously detected in the 15--55 keV…M. Ajello, P. Rebusco, N. Cappelluti et al.·Aug 30, 2008SaveLearn
Needlet Detection of Features in WMAP CMB Sky and the Impact on Anisotropies and Hemispherical AsymmetriesWe apply spherical needlets to the Wilkinson Microwave Anisotropy Probe 5-year cosmic microwave background (CMB) dataset, to search for imprints of non-isotropic features in the CMB sky. We use the…Davide Pietrobon, Alexandre Amblard, Amedeo Balbi et al.·Aug 29, 2008SaveLearn
A model for the waveform behavior of accreting millisecond pulsars: Nearly aligned magnetic fields and moving emission regionsWe investigate further a model of the accreting millisecond X-ray pulsars we proposed earlier. In this model, the X-ray-emitting regions of these pulsars are near their spin axes but move. This is to…Frederick K. Lamb, Stratos Boutloukos, Sandor Van Wassenhove et al.·Aug 29, 2008SaveLearn
No Evidence for Variability of Intervening Absorption Lines toward GRB 060206: Implications for the Mg II Incidence ProblemWe examine variability of absorption line strength of intervening systems along the line of sight to GRB 060206 at z = 4.05, by the low-resolution optical spectra obtained by the Subaru telescope…Kentaro Aoki, Tomonori Totani, Takashi Hattori et al.·Aug 29, 2008SaveLearn