RISE: a fast-readout imager for exoplanet transit timingBy the precise timing of the low amplitude (0.005 - 0.02 magnitude) transits of exoplanets around their parent star it should be possible to infer the presence of other planetary bodies in the system…I. A. Steele, S. D. Bates, N. Gibson et al.·Sep 19, 2008SaveLearn
Vsop2/Astro-G ProjectWe introduce a new space VLBI project, the Second VLBI Space Observatory Program (VSOP2), following the success of the VLBI Space Observatory Program (VSOP1). VSOP2 has 10 times higher angular…Masato Tsuboi·Sep 19, 2008SaveLearn
Turbulent magnetic Prandtl numbers obtained with MHD Taylor-Couette flow experimentsThe stability problem of MHD Taylor-Couette flows with toroidal magnetic fields is considered in dependence on the magnetic Prandtl number. Only the most uniform (but not current-free) field with…M. Gellert, G. Ruediger·Sep 19, 2008SaveLearn
Predicting spin of compact objects from their QPOs: A global QPO modelWe establish a unified model to explain Quasi-Periodic-Oscillation (QPO) observed from black hole and neutron star systems globally. This is based on the accreting systems thought to be damped…Banibrata Mukhopadhyay·Sep 19, 2008SaveLearn
Aligning VLBI Images of Active Galactic Nuclei at Different FrequenciesMany important techniques for investigating the properties of extragalactic radio sources, such as spectral-index and rotation-measure mapping, involve the comparison of images at two or more…S. M. Croke, D. C. Gabuzda·Sep 19, 2008SaveLearn
High Resolution Spectropolarimetry of the H-alpha Line: Obscured Stars and Absorptive PolarizationThe near-star environment around obscured stars is very dynamic. Many classes of stars show evidence for winds, disks, inflows and outflows with many phenomena occurring simultaneously. These…D. M. Harrington, J. R. Kuhn·Sep 19, 2008SaveLearn
Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714In this paper, we report results of our near-infrared (NIR) photometric variability studies of the BL Lacertae object S5 0716+714. NIR photometric observations spread over 7 nights during our…Alok C. Gupta, Sang-Mok Cha, Sungho Lee et al.·Sep 19, 2008SaveLearn
Magnetic Properties of Young Stars in the TW Hydrae AssociationWe present an analysis of infrared (IR) echelle spectra of five stars in the TW Hydrae Association (TWA). We model the Zeeman broadening in four magnetic-sensitive Ti1 lines near 2.2 μm and…Hao Yang, Christopher M. Johns-Krull, Jeff A. Valenti·Sep 19, 2008SaveLearn
A Survey for a Coeval, Comoving Group Associated with HD 141569We present results of a search for a young stellar moving group associated with the star HD 141569, a nearby, isolated Herbig AeBe primary member of a 5+/-3 Myr-old triple star system on the…Alicia N. Aarnio, Alycia J. Weinberger, Keivan G. Stassun et al.·Sep 19, 2008SaveLearn
Radial velocities, dynamics of stars and nebulosities with GAIA and VLT-GIRAFFEThis document is divided in two parts. The first part deals with the radial velocities (RV) distributions for B-type stars and nebulosities observed with the VLT-GIRAFFE in the Large and Small…Christophe Martayan, Yves Fremat, Ronny Blomme et al.·Sep 19, 2008SaveLearn
SDSS J092712.65+294344.0: Recoiling Black Hole or A Sub-parsec Binary Candidate?A search for recoiling supermassive black hole candidates recently yielded the best candidate thus far, SDSS J092712.65+294344.0 reported by Komossa et al. Here we propose the alternative hypothesis…Tamara Bogdanovic, Michael Eracleous, Steinn Sigurdsson·Sep 18, 2008SaveLearn
A model of the TeV flare of Cygnus X-1: electron acceleration and extended pair cascadesWe consider theoretical models of emission of TeV photons by Cyg X-1 during a flare discovered by the MAGIC detector. We study acceleration of electrons to energies sufficient for TeV emission, and…A. A. Zdziarski, J. Malzac, W. Bednarek·Sep 18, 2008SaveLearn
The radiative transfer for polarized radiation at second order in cosmological perturbationsThis article investigates the full Boltzmann equation up to second order in the cosmological perturbations. Describing the distribution of polarized radiation by using a tensor valued distribution…Cyril Pitrou·Sep 18, 2008SaveLearn
Radio constraints on dark matter annihilation in the galactic halo and its substructuresAnnihilation of Dark Matter usually produces together with gamma rays comparable amounts of electrons and positrons. The e+e- gyrating in the galactic magnetic field then produce secondary…Enrico Borriello, Alessandro Cuoco, Gennaro Miele·Sep 18, 2008SaveLearn
Magnification Bias Corrections to Galaxy-Lensing Cross-CorrelationsGalaxy-galaxy or galaxy-quasar lensing can provide important information on the mass distribution in the Universe. It consists of correlating the lensing signal (either shear or magnification) of a…R. Ziour, L. Hui·Sep 18, 2008SaveLearn
Transient outburst mechanisms in Supergiant Fast X-ray TransientsThe recent discovery of a new class of recurrent and fast X-ray transient sources, the Supergiant Fast X-ray Transients, poses interesting questions on the possible mechanisms responsible for their…L. Sidoli·Sep 18, 2008SaveLearn
Stratorotational instability in Taylor-Couette flow heated from aboveWe investigate the instability and nonlinear saturation of temperature-stratified Taylor-Couette flows in a finite height cylindrical gap and calculate angular-momentum transport in the nonlinear…M. Gellert, G. Rüdiger·Sep 18, 2008SaveLearn
Diversity of supernovae Ia determined using equivalent widths of Si II 4000Spectroscopic and photometric properties of low and high-z supernovae Ia (SNe Ia) have been analyzed in order to achieve a better understanding of their diversity and to identify possible SN Ia…V. Arsenijevic, S. Fabbro, A. M. Mourao et al.·Sep 18, 2008SaveLearn
Dynamics and constraints of the Unified Dark Matter flat cosmologiesWe study the dynamics of the scalar field FLRW flat cosmological models within the framework of the Unified Dark Matter (UDM) scenario. In this model we find that the main cosmological functions such…S. Basilakos, G. Lukes-Gerakopoulos·Sep 18, 2008SaveLearn
HI and CO in the circumstellar environment of the oxygen-rich AGB star RX LepCircumstellar shells around AGB stars are built over long periods of time that may reach several million years. They may therefore be extended over large sizes (~1 pc, possibly more), and different…Y. Libert, T. Le Bertre, E. Gérard et al.·Sep 18, 2008SaveLearn
HW Vir's Companion: a M-type Dwarf, or maybe a giant rotating spherical Mirror?From optical high-resolution spectra the nature of the unseen companion of HW Vir is determined without detection of any spectral features originating from the secondary itself. Using radial velocity…Heinz Edelmann·Sep 18, 2008SaveLearn
The Cosmic Crystallinity Conundrum: Clues from IRAS 17495-2534Since their discovery, cosmic crystalline silicates have presented several challenges to understanding dust formation and evolution. The mid-infrared spectrum of IRAS 17495-2534, a highly obscured…Angela K. Speck, Alan G. Whittington, Josh B. Tartar·Sep 18, 2008SaveLearn
Exposition to Staggered Multi-Field InflationI investigate multi-field inflationary models with fields that decay during inflation, leading to staggered inflation. This feature is natural in many models motivated by string theory, for instance…Thorsten Battefeld·Sep 18, 2008SaveLearn
O-like Stars in the Direction of the North America and Pelican NebulaeIn the area covering the complex of the North America and Pelican nebulae we identified 13 faint stars with J-H and H-Ks color indices which simulate heavily reddened O-type stars. One of these stars…V. Straizys, V. Laugalys·Sep 18, 2008SaveLearn
Evidence for a Photoevaporated Circumbinary Disk in OrionWe have found a photoevaporated disk in the Orion Nebula that includes a wide binary. HST/ACS observations of the proplyd 124-132 show two point-like sources separated by 0".15, or about 60 AU at…M. Robberto, L. Ricci, N. Da Rio et al.·Sep 18, 2008SaveLearn