Now showing items 168-187 of 479

  • Hawking radiation and the boomerang behaviour of massive modes near a horizon 

    Jannes, Gil; Maissa, Philippe; Philbin, Thomas G.; Rousseaux, Germain (American Physical Society, 2011)
    We discuss the behaviour of massive modes near a horizon based on a study of the dispersion relation and wave packet simulations of the Klein-Gordon equation. We point out an apparent paradox between two (in principle ...
  • Hawking tunneling and boomerang behaviour of massive particles with E < m 

    Jannes, Gil; Philbin, Thomas G.; Rousseaux, Germain (American Institute of Physics, 2012)
    Massive particles are radiated from black holes through the Hawking mechanism together with the more familiar radiation of massless particles. For E ≥ m, the emission rate is identical to the massless case. But E < m ...
  • Heavily loaded ferrite-polymer composites to produce high refractive index materials at centimetre wavelengths 

    Parke, L.; Hooper, Ian R.; Hicken, R.J.; Dancer, C.E.J.; Grant, P.S.; Youngs, I.J.; Sambles, J. Roy; Hibbins, Alastair P. (American Institute of Physics (AIP), 2013)
    A cold-pressing technique has been developed for fabricating composites composed of a polytetrafluoroethylene-polymer matrix and a wide range of volume-fractions of MnZn-ferrite filler (0%–80%). The electromagnetic properties ...
  • The Herschel and JCMT Gould belt surveys: Constraining dust properties in the Perseus B1 clump with PACS, SPIRE, and SCUBA-2 

    Sadavoy, S.I.; Di Francesco, J.; Johnstone, D.; Currie, M.J.; Drabek, E.; Hatchell, Jennifer; Nutter, D.; André, P.; Arzoumanian, D.; Benedettini, M.; Bernard, J-P.; Duarte-Cabral, A.; Fallscheer, C.; Friesen, R.; Greaves, J.; Hennemann, M.; Hill, T.; Jenness, T.; Könyves, V.; Matthews, B.C.; Mottram, J.C.; Pezzuto, S.; Roy, A.; Rygl, K.; Schneider-Bontemps, N.; Spinoglio, L.; Testi, L.; Tothill, N.; Ward-Thompson, D.; White, G.J. (American Astronomical Society / IOP Publishing, 2013)
    We present Herschel observations from the Herschel Gould Belt Survey and SCUBA-2 science verification observations from the JCMT Gould Belt Survey of the B1 clump in the Perseus molecular cloud. We determined the dust ...
  • High-frequency dielectric relaxation of liquid crystals: THz time-domain spectroscopy of liquid crystal colloids 

    Oh-e, Masahito; Yokoyama, Hiroshi; Koeberg, Mattijs; Hendry, Euan; Bonn, Mischa (Optical Society of America, 2006)
    Terahertz time-domain spectroscopy has been used to study the dielectric relaxation of pure 4’–n-pentyl–4–cyanobiphenyl (5CB) liquid crystal (LC) and its mixtures with 10 µm SiO2 particles in the frequency range 0.2–2 THz. ...
  • Hint of a transiting extended atmosphere on 55 Cancri b 

    Ehrenreich, D.; Bourrier, V.; Bonfils, X.; Lecavelier des Etangs, A.; Hebrard, G.; Sing, David K.; Wheatley, P.J.; Vidal-Madjar, A.; Delfosse, X.; Udry, S.; Forveille, T.; Moutou, C. (EDP Sciences for European Southern Observatory (ESO), 2012)
    The naked-eye star 55 Cancri hosts a planetary system with five known planets, including a hot super-Earth (55 Cnc e) extremely close to its star and a farther out giant planet (55 Cnc b), found in milder irradiation ...
  • Holographic imaging of interlayer coupling in Co/Pt/NiFe 

    Duckworth, Thomas A.; Ogrin, Feodor Y.; Beutier, Guillaume; Dhesi, Sarnjeet S.; Cavill, Stuart A.; Langridge, Sean; Whiteside, Amy; Moore, Thomas; Dupraz, Maxime; Yakhou, Flora; Van Der Laan, Gerrit (Institute of Physics, 2013)
    We present a method to determine the magnetic configuration of an in-plane magnetized permalloy layer using Fourier transform holography with extended references in an off-normal geometry. We use a narrow slit as an extended ...
  • Horizon effects with surface waves on moving water 

    Rousseaux, Germain; Maissa, Philippe; Mathis, Christian; Coullet, Pierre; Philbin, Thomas G.; Leonhardt, Ulf (Institute of Physics, 2010)
    Surface waves on a stationary flow of water are considered, in a linear model that includes the surface tension of the fluid. The resulting gravity-capillary waves experience a rich array of horizon effects when propagating ...
  • HST hot Jupiter transmission spectral survey: detection of water in HAT-P-1b from WFC3 near-IR spatial scan observations 

    Wakeford, H.R.; Sing, David K.; Deming, D.; Gibson, N.; Fortney, J.J.; Burrows, A.S.; Ballester, G.; Nikolov, N.; Aigrain, Suzanne; Henry, G.; Knutson, H.; Lecavelier des Etangs, A.; Pont, F.; Showman, A.P.; Vidal-Madjar, A.; Zahnle, K. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
    We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting hot-Jupiter HAT-P-1b. We observed one transit with Wide Field Camera 3 using the G141 low-resolution grism to cover the wavelength ...
  • HST hot-Jupiter transmission spectral survey: detection of potassium in WASP-31b along with a cloud deck and Rayleigh scattering 

    Sing, David K.; Wakeford, H.R.; Showman, A.P.; Nikolov, N.; Fortney, J.J.; Burrows, A.S.; Ballester, G.; Deming, D.; Aigrain, Suzanne; Desert, J.-M.; Gibson, N.; Henry, G.; Knutson, H.; Lecavelier des Etangs, A.; Pont, F.; Vidal-Madjar, A.; Williamson, M.W.; Wilson, Paul A. (Oxford University Press on behalf of the Royal Astronomical Society, 2015)
    We present Hubble Space Telescope optical and near-IR transmission spectra of the transiting hot-Jupiter WASP-31b. The spectrum covers 0.3–1.7 μm at a resolution R ∼ 70, which we combine with Spitzer photometry to cover ...
  • HST hot-Jupiter transmission spectral survey: Evidence for aerosols and lack of TiO in the atmosphere of WASP-12b 

    Sing, David K.; Lecavelier des Etangs, A.; Fortney, J.J.; Burrows, A.S.; Pont, F.; Wakeford, H.R.; Ballester, G.; Nikolov, N.; Henry, G.; Aigrain, Suzanne; Deming, D.; Evans, T.M.; Gibson, N.; Huitson, Catherine M.; Knutson, H.; Showman, A.P.; Vidal-Madjar, A.; Wilson, Paul A.; Williamson, M.H.; Zahnle, K. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
    We present Hubble Space Telescope (HST) optical transmission spectra of the transiting hot-Jupiter WASP-12b, taken with the Space Telescope Imaging Spectrograph instrument. The resulting spectra cover the range 2900–10 300 Å ...
  • HST hot-Jupiter transmission spectral survey: Haze in the atmosphere of WASP-6b 

    Nikolov, N.; Sing, David K.; Burrows, A.S.; Fortney, J.J.; Henry, G.; Pont, F.; Ballester, G.; Aigrain, Suzanne; Wilson, Paul A.; Huitson, Catherine M.; Gibson, N.; Desert, J.-M.; Lecavelier des Etangs, A.; Showman, A.P.; Vidal-Madjar, A.; Wakeford, H.R.; Zahnle, K. (Oxford University Press on behalf of the Royal Astronomical Society, 2014)
    We report Hubble Space Telescope optical to near-infrared transmission spectroscopy of the hot-Jupiter WASP-6b, measured with the Space Telescope Imaging Spectrograph and Spitzer's InfraRed Array Camera. The resulting ...
  • An HST optical-to-near-IR transmission spectrum of the hot Jupiter WASP-19b: detection of atmospheric water and likely absence of TiO 

    Huitson, Catherine M.; Sing, David K.; Pont, F.; Fortney, J.J.; Burrows, A.S.; Wilson, Paul A.; Ballester, G.; Nikolov, N.; Gibson, N.; Deming, D.; Aigrain, Suzanne; Evans, T.M.; Henry, G.; Lecavelier des Etangs, A.; Showman, A.P.; Vidal-Madjar, A.; Zahnle, K. (Oxford University Press / Royal Astronomical Society, 2013)
    We measure the transmission spectrum of WASP-19b from three transits using low-resolution optical spectroscopy from the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS). The STIS spectra cover a ...
  • Hubble Space Telescope hot Jupiter transmission spectral survey: A detection of Na and strong optical absorption in HAT-P-1b 

    Nikolov, N.; Sing, David K.; Pont, F.; Burrows, A.S.; Fortney, J.J.; Ballester, G.; Evans, T.M.; Huitson, Catherine M.; Wakeford, H.R.; Wilson, Paul A.; Aigrain, Suzanne; Deming, D.; Gibson, N.; Henry, G.; Knutson, H.; Lecavelier des Etangs, A.; Showman, A.P.; Vidal-Madjar, A.; Zahnle, K. (Oxford University Press / Royal Astronomical Society, 2013)
    We present an optical to near-infrared transmission spectrum of the hot Jupiter HAT-P-1b, based on Hubble Space Telescope observations, covering the spectral regime from 0.29 to 1.027 μm with Space Telescope Imaging ...
  • Hubble Space Telescope STIS optical transit transmission spectra of the hot Jupiter HD 209458b 

    Sing, David K.; Vidal-Madjar, A.; Desert, J.-M.; Lecavelier des Etangs, A.; Ballester, G. (American Astronomical Society / IOP Publishing, 2008)
    We present the transmission spectra of the hot Jupiter HD 209458b taken with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. Our analysis combines data at two resolutions and applies a complete ...
  • Hubble Space Telescope transmission spectroscopy of the exoplanet HD 189733b: high-altitude atmospheric haze in the optical and near-ultraviolet with STIS 

    Sing, David K.; Pont, F.; Aigrain, Suzanne; Charbonneau, D.; Desert, J.-M.; Gibson, N.; Gilliland, R.L.; Hayek, W.; Henry, G.; Knutson, H.; Lecavelier des Etangs, A.; Mazeh, T.; Shporer, A. (Oxford University Press / Royal Astronomical Society, 2011)
    We present Hubble Space Telescope (HST) optical and near-ultraviolet transmission spectra of the transiting hot Jupiter HD 189733b, taken with the repaired Space Telescope Imaging Spectrograph (STIS) instrument. The resulting ...
  • Imaging collective magnonic modes in 2D arrays of magnetic nanoelements 

    Kruglyak, V.V.; Keatley, Paul Steven; Neudert, A.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2010)
    We have used time resolved scanning Kerr microscopy to image collective spin wave modes within a 2D array of magnetic nanoelements. Long wavelength spin waves are confined within the array as if it was a continuous element ...
  • Imaging small-amplitude magnetization dynamics in a longitudinally magnetized microwire 

    Kruglyak, V.V.; Keatley, Paul Steven; Neudert, A.; Delchini, M.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2008)
    We have used time-resolved scanning Kerr microscopy to study spin waves in a magnetic microwire subjected to a bias magnetic field applied parallel to its long axis. The spin-wave spectra obtained from different points ...
  • Imaging the dephasing of spin wave modes in a square thin film magnetic element 

    Barman, A.; Kruglyak, V.V.; Hicken, R.J.; Rowe, J.M.; Kundrotaite, A.; Scott, J.; Rahman, M. (American Physical Society, 2004)
    We have used time-resolved scanning Kerr effect microscopy to study dephasing of spin wave modes in a square Ni81Fe19 element of 10 μm width and 150 nm thickness. When a static magnetic field H was applied parallel to an ...
  • Imaging the uptake of gold nanoshells in live cells using plasmon resonance enhanced four wave mixing microscopy 

    Garrett, Natalie; Whiteman, Matt; Moger, Julian (Optical Society of America, 2011)
    Gold nanoshells (GNS) are novel metal nanoparticles exhibiting attractive optical properties which make them highly suitable for biophotonics applications. We present a novel investigation using plasmon-enhanced four wave ...