Now showing items 1015-1034 of 1403

  • Radial velocity eclipse mapping of exoplanets 

    Nikolov, Nikolay; Sainsbury-Martinez, Felix (American Astronomical Society / IOP Publishing, 2015-07-17)
    Planetary rotation rates and obliquities provide information regarding the history of planet formation, but have not yet been measured for evolved extrasolar planets. Here we investigate the theoretical and observational ...
  • Radiation damping in atomic photonic crystals 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2011)
    The force exerted on a material by an incident beam of light is dependent upon the material’s velocity in the laboratory frame of reference. This velocity dependence is known to be difficult to measure, as it is proportional ...
  • Radiation damping optical enhancement in cold atoms 

    Wu, Jin-Hui; Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Nature Publishing Group, 2013)
    The typically tiny effect of radiation damping on a moving body can be amplified to a favorable extent by exploiting the sharp reflectivity slope at one edge of an optically induced stop-band in atoms loaded into an optical ...
  • Radiation hydrodynamics simulations of massive star formation using Monte Carlo radiation transfer 

    Harries, TJ; Haworth, TJ; Acreman, D (Springer, 2014-01-28)
    We present a radiation hydrodynamics simulation of the formation of a massive star using a Monte Carlo treatment for the radiation field. We find that strong, high speed bipolar cavities are driven by the radiation from ...
  • Radiation pressure in stratified moving media 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2012)
    A general theory of optical forces on moving bodies is here developed in terms of generalized 4×4 transfer and scattering matrices. Results are presented for a planar dielectric of arbitrary refractive index placed in an ...
  • Radiation pressure on a moving body: Beyond the Doppler effect 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Optical Society of America, 2012)
    The dependence of macroscopic radiation pressure on the velocity of the object being pushed is commonly attributed to the Doppler effect. This need not be the case, and here we highlight velocity-dependent radiation pressure ...
  • Radiation-hydrodynamical simulations of massive star formation using Monte Carlo radiative transfer - I. Algorithms and numerical methods 

    Harries, Tim J. (Oxford University Press for Royal Astronomical Society, 2015-03-10)
    We present a set of new numerical methods that are relevant to calculating radiation pressure terms in hydrodynamics calculations, with a particular focus on massive star formation. The radiation force is determined from ...
  • Radiation-hydrodynamical simulations of massive star formation using Monte Carlo radiative transfer II. The formation of a 25 solar-mass star 

    Harries, TJ; Douglas, T; Ali, A (Oxford University Press (OUP), 2017-06-16)
    We present a numerical simulation of the formation of a massive star using Monte- Carlo-based radiation hydrodynamics (RHD). The star forms via stochastic disc ac- cretion and produces fast, radiation-driven bipolar ...
  • Radiative frequency shifts in nanoplasmonic dimers 

    Downing, CA; Mariani, E; Weick, G (American Physical Society, 2017-10-09)
    We study the effect of the electromagnetic environment on the resonance frequency of plasmonic excitations in dimers of interacting metallic nanoparticles. The coupling between plasmons and vacuum electromagnetic fluctuations ...
  • Radical-Pair-Based Magnetoreception Amplified by Radical Scavenging: Resilience to Spin Relaxation 

    Kattnig, DR (American Chemical Society, 2017-10-26)
    Birds and several other species are equipped with the remarkable ability to sense the geomagnetic field for the purpose of navigation and orientation. The primary detection mechanism of this compass sense is uncertain but ...
  • The radius and entropy of a magnetized, rotating fully-convective star: analysis with depth-dependent mixing length theories 

    Ireland, LG; Browning, MKM (American Astronomical Society / IOP Publishing, 2018-04-02)
    Some low-mass stars appear to have larger radii than predicted by standard 1D structure models; prior work has suggested that inefficient convective heat transport, due to rotation and/or magnetism, may ultimately be ...
  • Raman spectroscopy and multivariate analysis for the non invasive diagnosis of clinically inconclusive vulval lichen sclerosus. 

    Frost, J; Ludeman, L; Hillaby, K; Gornall, R; Lloyd, G; Kendall, C; Shore, AC; Stone, N (Royal Society of Chemistry, 2016-11-03)
    Vulval lichen sclerosus (LS) is a common inflammatory condition associated with an increased risk of developing vulval carcinoma. Diagnosis is usually clinical although biopsy is necessary if the diagnosis is uncertain or ...
  • Raman spectroscopy for medical diagnostics - From in-vitro biofluid assays to in-vivo cancer detection 

    Kong, K; Kendall, C; Stone, N; Notingher, I (Elsevier, 2015)
    Raman spectroscopy is an optical technique based on inelastic scattering of light by vibrating molecules and can provide chemical fingerprints of cells, tissues or biofluids. The high chemical specificity, minimal or lack ...
  • Raman spectroscopy: elucidation of biochemical changes in carcinogenesis of oesophagus. 

    Shetty, G; Kendall, C; Shepherd, N; Stone, N; Barr, H (Cancer Research UK, 2006-04-18)
    Several techniques are under development to diagnose oesophageal adenocarcinoma at an earlier stage. We have demonstrated the potential of Raman spectroscopy, an optical diagnostic technique, for the identification and ...
  • Rapid circumstellar disk evolution and an accelerating star formation rate in the Infrared Dark Cloud M17 SWex 

    Povich, Matthew S.; Townsley, Leisa K.; Robitaille, Thomas P.; Broos, Patrick S.; Orbin, Wesley T.; King, Robert R.; Naylor, Tim; Whitney, Barbara A. (American Astronomical Society, 2016-07-11)
    We present a catalog of 840 X-ray sources and rst results from a 100 ks Chandra X-ray Observatory imaging study of the lamentary infrared dark cloud G014.225{00.506, which forms the central regions of a larger cloud complex ...
  • Rapid switching in a dual-frequency hybrid aligned nematic liquid crystal cell 

    Jewell, Sharon A.; Taphouse, T. S.; Sambles, J. Roy (American Institute of Physics, 2005)
    We report the optical characterization of a dual-frequency hybrid aligned nematic (HAN) liquid crystal cell driven between two states using a multiple-frequency sinusoidal pulse. The complex dynamic director structure ...
  • Rate and nature of false positives in the CoRoT exoplanet search 

    Almenara, J.-M.; Deeg, H. J.; Aigrain, Suzanne; Alonso, R.; Auvergne, M.; Baglin, A.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Bruntt, H.; Cabrera, J.; Carone, L.; Carpano, S.; Catala, C.; Csizmadia, Sz.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gandolfi, D.; Gillon, M.; Gondoin, P.; Guenther, E. W.; Guillot, T.; Hatzes, A.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Loeillet, B.; Magain, P.; Mayor, M.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Schneider, J.; Shporer, A.; Wuchterl, G.; Zucker, S. (EDP Sciences, 2009)
    Context. The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12,000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of ...
  • Rayleigh scattering by H2 in the extrasolar planet HD 209458b 

    Lecavelier des Etangs, A.; Vidal-Madjar, A.; Desert, J.-M.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    Transiting planets, such as HD 209458b, offer a unique opportunity to scrutinize the planetary atmospheric content. Although molecular hydrogen is expected to be the main atmospheric constituent, H2 remains uncovered ...
  • Rayleigh scattering in the transit spectrum of HD 189733b 

    Lecavelier des Etangs, A.; Pont, F.; Vidal-Madjar, A.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    The transit spectrum of the exoplanet HD 189733b has recently been obtained between 0.55 and 1.05 m. Here we present an analysis of this spectrum. We develop first-order equations to interpret absorption spectra. In the ...
  • Reconnaissance of the HR 8799 exosolar system. II. Astrometry and orbital motion 

    Pueyo, L; Soummer, R; Hoffmann, J; Oppenheimer, R; Graham, JR; Zimmerman, N; Zhai, C; Wallace, JK; Vescelus, F; Veicht, A; Vasisht, G; Truong, T; Sivaramakrishnan, A; Shao, M; Roberts, LC; Roberts, JE; Rice, E; Parry, IR; Nilsson, R; Lockhart, T; Ligon, ER; King, D; Hinkley, S; Hillenbrand, L; Hale, D; Dekany, R; Crepp, JR; Cady, E; Burruss, R; Brenner, D; Beichman, C; Baranec, C (American Astronomical Society / IOP Publishing, 2015-04-10)
    We present an analysis of the orbital motion of the four substellar objects orbiting HR 8799. Our study relies on the published astrometric history of this system augmented with an epoch obtained with the Project 1640 ...