Now showing items 1-20 of 1143

  • A 1.9 Earth radius rocky planet and the discovery of a non-transiting planet in the Kepler-20 system 

    Buchhave, Lars A.; Dressing, Courtney D.; Dumusque, Xavier; Rice, Ken; Vanderburg, Andrew; Mortier, Annelies; Lopez-Morales, Mercedes; Lopez, Eric; Lundkvist, Mia S.; Kjeldsen, Hans; Affer, Laura; Bonomo, Aldo S.; Charbonneau, David; Cameron, Andrew Collier; Cosentino, Rosario; Figueira, Pedro; Fiorenzano, Aldo F. M.; Harutyunyan, Avet; Haywood, Raphaëlle D.; Johnson, John Asher; Latham, David W.; Lovis, Christophe; Malavolta, Luca; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Motalebi, Fatemeh; Nascimbeni, Valerio; Pepe, Francesco; Phillips, David F.; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Sasselov, Dimitar; Ségransan, Damien; Sozzetti, Alessandro; Udry, Stéphane; Watson, Chris (2016-11-11) - Journal article
    Kepler-20 is a solar-type star (V = 12.5) hosting a compact system of five transiting planets, all packed within the orbital distance of Mercury in our own Solar System. A transition from rocky to gaseous planets with a ...
  • 1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite 

    Vasiliev, A; Volkova, O; Zvereva, E; Ovchenkov, E; Munao', Irene; Clark, Lucy Mary; Lightfoot, Philip; Vavilova, E; Kamusella, S; Klaus, H; Werner, J; Koo, C; Klingeler, R; Tsirlin, A (2016-04-01) - Journal article
    The sodium-iron phosphite NaFe3(HPO3)2(H2PO3)6 is studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer ...
  • 220GHz wideband 3D imaging radar for concealed object detection technology development and phenomenology studies 

    Robertson, Duncan Alexander; Macfarlane, David Graham; Bryllert, Tomas (SPIE-The International Society for Optical Engineering, 2016-05-12) - Conference item
    We present a 220 GHz 3D imaging ‘Pathfinder’ radar developed within the EU FP7 project CONSORTIS (Concealed Object Stand-Off Real-Time Imaging for Security) which has been built to address two objectives: (i) to de-risk ...
  • 3D MHD modeling of twisted coronal loops 

    Reale, F.; Orlando, S.; Guarrasi, M.; Mignone, A.; Peres, G.; Hood, A. W.; Priest, E. R. (2016-10-10) - Journal article
    We perform MHD modeling of a single bright coronal loop to include the interaction with a non-uniform magnetic field. The field is stressed by random footpoint rotation in the central region and its energy is dissipated ...
  • 3D Monte Carlo radiation transfer modelling of photodynamic therapy 

    Campbell, Catherine Louise; Christison, C.; Brown, C Tom A; Wood, Kenny; Valentine, Ronan Martin; Moseley, H. (SPIE, 2015-06) - Conference item
    The effects of ageing and skin type on Photodynamic Therapy (PDT) for different treatment methods have been theoretically investigated. A multilayered Monte Carlo Radiation Transfer model is presented where both daylight ...
  • 3D PiC code investigations of Auroral Kilometric Radiation mechanisms 

    Gillespie, K. M.; McConville, S. L.; Speirs, D. C.; Ronald, K.; Phelps, A. D. R.; Bingham, R.; Cross, A. W.; Robertson, C. W.; Whyte, C. G.; He, W.; Vorgul, I.; Cairns, R. A.; Kellett, B. J. (IOP PUBLISHING LTD, 2014) - Conference item
    Efficient (similar to 1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the ...
  • 3D whole-prominence fine structure modeling. II. Prominence evolution 

    Gunar, Stanislav; Mackay, Duncan Hendry (2015-10-20) - Journal article
    We use the new three-dimensional (3D) whole-prominence fine structure model to study the evolution of prominences and their fine structures in response to changes in the underlying photospheric magnetic flux distribution. ...
  • A 6% measurement of the Hubble parameter at z~0.45 : direct evidence of the epoch of cosmic re-acceleration 

    Moresco, Michele; Pozzetti, Lucia; Cimatti, Andrea; Jimenez, Raul; Maraston, Claudia; Verde, Licia; Thomas, Daniel; Citro, Annalisa; Tojeiro, Rita; Wilkinson, David (2016-05-04) - Journal article
    Deriving the expansion history of the Universe is a major goal of modern cosmology. To date, the most accurate measurements have been obtained with Type Ia Supernovae and Baryon Acoustic Oscillations, providing evidence ...
  • 94 GHz pulsed coherent radar for high power amplifier evaluation 

    Robertson, Duncan Alexander; Hunter, Robert Iain; Gallacher, Thomas (SPIE-The International Society for Optical Engineering, 2016-05-12) - Conference item
    We present the design and characterization of a 94 GHz pulsed coherent radar to be used for the evaluation and demonstration of novel wideband, high power vacuum tube amplifier technology. The radar is designed to be fully ...
  • Abiotic ozone and oxygen in atmospheres similar to prebiotic earth 

    Domagal-Goldman, S.D.; Segura, A.; Claire, M.W.; Robinson, T.D.; Meadows, V.S. (2014-09-10) - Journal article
    The search for life on planets outside our solar system will use spectroscopic identification of atmospheric biosignatures. The most robust remotely detectable potential biosignature is considered to be the detection of ...
  • Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001) 

    McKeown Walker, S; Riccò, S; Bruno, F Y; de la Torre, A; Tamai, A; Golias, E; Varykhalov, A; Marchenko, D; Hoesch, M; Bahramy, M S; King, Philip David; Sánchez-Barriga, J; Baumberger, F (2016-06-22) - Journal article
    We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander-Syro et al. [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented ...
  • The abundance and thermal history of water ice in the disk surrounding HD 142527 from the DIGIT Herschel Key Program 

    Min, M.; Bouwman, J.; Dominik, C.; Waters, L. B. F. M.; Pontoppidan, K. M.; Hony, S.; Mulders, G. D.; Henning, Th.; van Dishoeck, E. F.; Woitke, P.; Evans II, Neal J.; The DIGIT Team (2016-09-01) - Journal article
    Context. The presence or absence of ice in protoplanetary disks is of great importance to the formation of planets. By enhancing solid surface density and increasing sticking efficiency, ice catalyzes the rapid formation ...
  • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

    Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
    Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
  • Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga 

    Davies, Claire; Gregory, Scott; Greaves, Jane Sophia (2014-10-21) - Journal article
    In light of recent substantial updates to spectral type estimations and newly established intrinsic colours, effective temperatures, and bolometric corrections for pre-main sequence (PMS) stars, we re-address the theory ...
  • The accretion dynamics of EX Lupi in quiescence : the star, the spot, and the accretion column 

    Sicilia-Aguilar, Aurora; Fang, Min; Roccatagliata, Veronica; Collier Cameron, Andrew; Kóspál, Ágnes; Henning, Thomas; Ábrahám, Peter; Sipos, Nikoletta (2015-08-06) - Journal article
    Context. EX Lupi is a young, accreting M0 star and the prototype of EXor variable stars. Its spectrum is very rich in emission lines, including many metallic lines with narrow and broad components. The presence of a close ...
  • The accumulation and trapping of grains at planet gaps : effects of grain growth and fragmentation 

    Gonzalez, J.-F.; Laibe, G.; Maddison, S.T.; Pinte, C.; Ménard, F. (2015) - Journal article
    We model the dust evolution in protoplanetary disks with full 3D, Smoothed Particle Hydrodynamics (SPH), two-phase (gas+dust) hydrodynamical simulations. The gas+dust dynamics, where aerodynamic drag leads to the vertical ...
  • Active region emission measure distributions and implications for nanoflare heating 

    Cargill, P.J. (2014-03-20) - Journal article
    The temperature dependence of the emission measure (EM) in the core of active regions coronal loops is an important diagnostic of heating processes. Observations indicate that EM(T) ~ T a below approximately 4 MK, with 2 < ...
  • Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237 

    Alvarado-Gómez, J.D.; Hussain, Gaitee Ara Jaffer; Grunhut, J.; Fares, Rim; Donati, J.-F.; Alecian, E.; Kochukhov, O.; Oksala, M.; Morin, J.; Redfield, S.; Cohen, O.; Drake, J.J.; Jardine, Moira Mary; Matt, S.; Petit, P.; Walter, F.M. (2015-10) - Journal article
    We analyse the magnetic activity characteristics of the planet-hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational modulation of the magnetic longitudinal field ...
  • Advanced application of flexible metamaterials at visible frequencies 

    Kirkpatrick, B.C.; Reader-Harris, P.; Shen, Y.; Wu, J.; Di Falco, A. (SPIE, 2015-02-27) - Conference item
    Flexible metamaterials (FMMs) at optical frequencies can conform to a wide range of target geometries whilst allowing their optical properties to be tuned post-fabrication. Here we discuss this potential by presenting our ...
  • Advances in small lasers 

    Hill, Martin T; Gather, Malte Christian (2014-12) - Journal article
    Small lasers have dimensions or modes sizes close to or smaller than the wavelength of emitted light. In recent years there has been significant progress towards reducing the size and improving the characteristics of these ...