Now showing items 281-300 of 853

  • A gamma-ray burst at a redshift of z approximate to 8.2 

    Tanvir, N.R.; Fox, D.B.; Levan, A.J.; Berger, E.; Wiersema, K.; Fynbo, J.P.U.; Cucchiara, A.; Kruehler, T.; Gehrels, N.; Bloom, J.S.; Greiner, J.; Evans, P.A.; Rol, E.; Olivares, F.; Hjorth, J.; Jakobsson, P.; Farihi, J.; Willingale, R.; Starling, R.L.C.; Cenko, S.B.; Perley, D.; Maund, J.R.; Duke, J.; Wijers, R.A.M.J.; Adamson, A.J.; Allan, Alasdair; Bremer, M.N.; Burrows, D.N.; Castro-Tirado, A.J.; Cavanagh, B.; de Ugarte Postigo, A.; Dopita, M.A.; Fatkhullin, T.A.; Fruchter, A.S.; Foley, R.J.; Gorosabel, J.; Kennea, J.; Kerr, T.; Klose, S.; Krimm, H.A.; Komarova, V.N.; Kulkarni, S.R.; Moskvitin, A.S.; Mundell, C.G.; Naylor, Tim; Page, K.; Penprase, B.E.; Perri, M.; Podsiadlowski, P.; Roth, K.; Rutledge, R.E.; Sakamoto, T.; Schady, P.; Schmidt, B.P.; Soderberg, A.M.; Sollerman, J.; Stephens, A.W.; Stratta, G.; Ukwatta, T.N.; Watson, D.; Westra, E.; Wold, T.; Wolf, C. (Nature Publishing Group, 2009)
  • Gas accretion on to planetary cores: Three-dimensional self-gravitating radiation hydrodynamical calculations 

    Ayliffe, Benjamin A.; Bate, Matthew R. (Oxford University Press / Royal Astronomical Society, 2009)
    We present results from three-dimensional, self-gravitating radiation hydrodynamical models of gas accretion by planetary cores. In some cases, the accretion flow is resolved down to the surface of the solid core – the ...
  • Gemini planet imager observational calibrations V: Astrometry and distortion 

    Konopacky, QM; Thomas, SJ; MacIntosh, BA; Dillon, D; Sadakuni, N; Maire, J; Fitzgerald, M; Hinkley, S; Kalas, P; Esposito, T; Marois, C; Ingraham, PJ; Marchis, F; Perrin, MD; Graham, JR; Wang, JJ; De Rosa, RJ; Morzinski, K; Pueyo, L; Chilcote, JK; Larkin, JE; Fabrycky, D; Goodsell, SJ; Oppenheimer, BR; Patience, J; Saddlemyer, L; Sivaramakrishnan, A (Society of Photo-optical Instrumentation Engineers (SPIE), 2014-06-22)
    We present the results of both laboratory and on sky astrometric characterization of the Gemini Planet Imager (GPI). This characterization includes measurement of the pixel scale∗ of the integral field spectrograph (IFS), ...
  • General relativity in electrical engineering 

    Leonhardt, Ulf; Philbin, Thomas G. (Institute of Physics, 2006)
    In electrical engineering metamaterials have been developed that offer unprecedented control over electromagnetic fields. Here we show that general relativity lends the theoretical tools for designing devices made of such ...
  • Generalized coherent states 

    Philbin, TG (American Association of Physics Teachers, 2014)
    In the coherent state of the harmonic oscillator, the probability density is that of the ground state subjected to an oscillation along a classical trajectory. Senitzky and others pointed out that there are states of the ...
  • Generation of propagating spin waves from regions of increased dynamic demagnetising field near magnetic antidots 

    Davies, CS; Sadovnikov, AV; Grishin, SV; Sharaevskii, YP; Nikitov, SA; Kruglyak, VV (American Institute of Physics (AIP), 2015-10-20)
    We have used Brillouin Light Scattering and micromagnetic simulations to demonstrate a point-like source of spin waves created by the inherently nonuniform internal magnetic field in the vicinity of an isolated antidot ...
  • A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b 

    Ehrenreich, D.; Bourrier, V.; Wheatley, P.J.; Lecavelier des Etangs, A.; Hebrard, G.; Udry, S.; Bonfils, X.; Delfosse, X.; Desert, J.-M.; Sing, David K.; Vidal-Madjar, A. (Nature Publishing Group, 2015-06-25)
    Exoplanets orbiting close to their parent stars may lose some fraction of their atmospheres because of the extreme irradiation. Atmospheric mass loss primarily affects low-mass exoplanets, leading to the suggestion that ...
  • Global-scale Magnetism (and Cycles) in Dynamo Simulations of Stellar Convection Zones 

    Brown, Benjamin P.; Browning, Matthew K.; Brun, Allan Sacha; Miesch, Mark S.; Toomre, Juri (Astronomical Society of the Pacific, 2011-01)
    Young solar-type stars rotate rapidly and are very magnetically active. The magnetic fields at their surfaces likely originate in their convective envelopes where convection and rotation can drive strong dynamo action. ...
  • Graded-index magnonics 

    Davies, Carl S.; Kruglyak, V.V. (American Institute of Physics (AIP), 2015-08-25)
    The wave solutions of the Landau–Lifshitz equation (spin waves) are characterized by some of the most complex and peculiar dispersion relations among all waves. For example, the spin-wave (“magnonic”) dispersion can range ...
  • Graded-index magnonics 

    Davies, CS; Kruglyak, VV (American Institute of Physics, 2015-10-01)
    © 2015 AIP Publishing LLC. The wave solutions of the Landau-Lifshitz equation (spin waves) are characterized by some of the most complex and peculiar dispersion relations among all waves. For example, the spin-wave ...
  • Grain boundaries in granular materials-A fundamental limit for thermal stability 

    Saharan, L; Morrison, C; Ikeda, Y; Takano, K; Miles, JJ; Thomson, T; Schrefl, T; Hrkac, G (American Institute of Physics (AIP), 2013)
    We show that thermal-stability and the associated switching field in well segregated, nanoscale granular materials is explained by grain boundary and interface effects. Grain boundaries pose a fundamental limit on scaling ...
  • Grain-size dependent demagnetizing factors in permanent magnets 

    Bance, S; Seebacher, B; Schrefl, T; Exl, L; Winklhofer, M; Hrkac, G; Zimanyi, G; Shoji, T; Yano, M; Sakuma, N; Ito, M; Kato, A; Manabe, A (American Institute of Physics (AIP), 2014)
    The coercive field of permanent magnets decreases with increasing grain size. The grain size dependence of coercivity is explained by a size dependent demagnetizing factor. In Dy free Nd$_2$Fe$_{14}$B magnets the size ...
  • Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: Detection of potassium in XO-2b from narrowband spectrophotometry 

    Sing, David K.; Desert, J.-M.; Fortney, J.J.; Lecavelier des Etangs, A.; Ballester, G.; Cepa, J.; Ehrenreich, D.; Lopez-Morales, M.; Pont, F.; Shabram, M.; Vidal-Madjar, A. (EDP Sciences, 2011)
    We present Gran Telescopio Canarias (GTC) optical transit narrowband photometry of the hot-Jupiter exoplanet XO-2b using the OSIRIS instrument. This unique instrument has the capabilities to deliver high-cadence narrowband ...
  • Grating-coupled surface plasmons at microwave frequencies 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 1999)
    This work presents a detailed investigation of electromagnetic coupling to the surface plasmon-polariton (SPP) at microwave frequencies. We have recorded the wavelength-dependent reflectivity from a metallic sinusoidal ...
  • Gratingless enhanced microwave transmission through a subwavelength aperture in a thick metal plate 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R. (American Institute of Physics, 2002)
    Remarkably enhanced transmission of microwave radiation through a single subwavelength slit in a thick metallic substrate surrounded by just a pair of parallel deep and narrow grooves is recorded. By also patterning the ...
  • Grazing-incidence iridescence from a butterfly wing 

    Lawrence, Christopher R.; Vukusic, Peter; Sambles, J. Roy (Optical Society of America, 2002)
    The Troides magellanus butterfly exhibits a specialized iridescence that is visible only when its hind wings are both illuminated and viewed at near-grazing incidence. The effect is due to the presence of a constrained ...
  • A ground-based optical transmission spectrum of WASP-6b 

    Jordán, A; Espinoza, N; Rabus, M; Eyheramendy, S; Sing, DK; Désert, JM; Bakos, GA; Fortney, JJ; López-Morales, M; Maxted, PFL; Triaud, AHMJ; Szentgyorgyi, A (American Astronomical Society, 2013-11-13)
    We present a ground-based optical transmission spectrum of the inflated sub-Jupiter-mass planet WASP-6b. The spectrum was measured in 20 spectral channels from 480 nm to 860 nm using a series of 91 spectra over a complete ...
  • Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission 

    Deeg, H. J.; Gillon, M.; Shporer, A.; Rouan, D.; Stecklum, B.; Aigrain, Suzanne; Alapini, Aude; Almenara, J.-M.; Alonso, R.; Barbieri, M.; Bouchy, F.; Eislöffel, J.; Erikson, A.; Fridlund, M.; Eigmüller, P.; Handler, G.; Hatzes, A.; Kabath, P.; Lendl, M.; Mazeh, T.; Moutou, C.; Queloz, D.; Rauer, H.; Rabus, M.; Tingley, B.; Titz, R. (EDP Sciences, 2009)
    The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d'être arises from the much higher spatial resolution ...
  • Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b 

    Sing, David K.; Lopez-Morales, M. (EDP Sciences, 2009)
    We report on the detection of the secondary eclipse of the very-hot Jupiter OGLE-TR-56b from combined z'-band time series photometry obtained with the VLT and Magellan telescopes. We measure a flux decrement of 0.0363 ± ...
  • GTC OSIRIS transiting exoplanet atmospheric survey: detection of potassium in HAT-P-1b from narrow-band spectrophotometry 

    Wilson, Paul A.; Sing, David K.; Nikolov, N.; Lecavelier des Etangs, A.; Pont, F.; Fortney, J.J.; Ballester, G.; Desert, J.-M.; Vidal-Madjar, A. (Oxford University Press for Royal Astronomical Society, 2015-04-15)
    We present the detection of potassium in the atmosphere of HAT-P-1b using optical transit narrow-band photometry. The results are obtained using the 10.4-m Gran Telescopio Canarias together with the OSIRIS instrument in ...