Now showing items 407-426 of 851

  • An M-dwarf star in the transition disk of Herbig HD 142527 

    Lacour, S; Biller, B; Cheetham, A; Greenbaum, A; Pearce, T; Marino, S; Tuthill, P; Pueyo, L; Mamajek, EE; Girard, JH; Sivaramakrishnan, A; Bonnefoy, M; Baraffe, I; Chauvin, G; Olofsson, J; Juhasz, A; Benisty, M; Pott, J-U; Sicilia-Aguilar, A; Henning, T; Cardwell, A; Goodsell, S; Graham, JR; Hibon, P; Ingraham, P; Konopacky, Q; Macintosh, B; Oppenheimer, R; Perrin, M; Rantakyrö, F; Sadakuni, N; Thomas, S (EDP Sciences, 2016-06)
    Aims. HD 142527A is one of the most studied Herbig Ae/Be stars with a transitional disk, as it has the largest imaged gap in any protoplanetary disk: the gas is cleared from 30 to 90 AU. The HD 142527 system is also unique ...
  • Macroscopic ordering of polystyrene carboxylate-modified nanospheres self-assembled at the water-air interface 

    Sirotkin, Evgeny; Apweiler, Julius D.; Ogrin, Feodor Y. (American Chemical Society, 2010)
    We present results from an experimental study of ordering characteristics in monolayers of polystyrene nanospheres self-assembled at a water-air interface. We demonstrate that the interaction of spheres, governed by the ...
  • Magnesium in the atmosphere of the planet HD 209458 b: Observations of the thermosphere-exosphere transition region 

    Vidal-Madjar, A.; Huitson, Catherine M.; Bourrier, V.; Desert, J.-M.; Ballester, G.; Lecavelier des Etangs, A.; Sing, David K.; Ehrenreich, D.; Ferlet, R.; Hebrard, G.; McConnell, J.C. (EDP Sciences for European Southern Observatory (ESO), 2013)
    The planet HD 209458 b is one of the most well studied hot-Jupiter exoplanets. The upper atmosphere of this planet has been observed through ultraviolet/optical transit observations with H i observation of the exosphere ...
  • Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star 

    Lanza, A. F.; Pagano, I.; Leto, G.; Messina, S.; Aigrain, Suzanne; Alonso, R.; Auvergne, M.; Baglin, A.; Barge, P.; Bonomo, A. S.; Boumier, P.; Collier Cameron, A.; Comparato, M.; Cutispoto, G.; De Medeiros, J. R.; Foing, B.; Kaiser, A.; Moutou, C.; Parihar, P. S.; Silva-Valio, A.; Weiss, W. W. (EDP Sciences, 2009)
    Context. The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoTExo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 ...
  • Magnetic Braking Formulation for Sun-like Stars: Dependence on Dipole Field Strength and Rotation Rate 

    Matt, Sean P.; MacGregor, Keith B.; Pinsonneault, Marc H.; Greene, Thomas P. (American Astronomical Society / IoP Publishing, 2012)
    We use two-dimensional axisymmetric magnetohydrodynamic simulations to compute steady-state solutions for solar-like stellar winds from rotating stars with dipolar magnetic fields. Our parameter study includes 50 simulations ...
  • Magnetic braking formulation for Sun-like stars: dependence on dipole field strength and rotation rate 

    Matt, Sean P.; MacGregor, Keith B.; Pinsonneault, Marc H.; Greene, Thomas P. (American Astronomical Society, 2012-06-11)
    We use two-dimensional axisymmetric magnetohydrodynamic simulations to compute steady-state solutions for solar-like stellar winds from rotating stars with dipolar magnetic fields. Our parameter study includes 50 simulations ...
  • Magnetic Cycles in a Convective Dynamo Simulation of a Young Solar-type Star 

    Brown, Benjamin P.; Miesch, Mark S.; Browning, Matthew K.; Brun, Allan Sacha; Toomre, Juri (American Astronomical Society / IOP Publishing, 2011)
    Young solar-type stars rotate rapidly and many are magnetically active. Some appear to undergo magnetic cycles similar to the 22 yr solar activity cycle. We conduct simulations of dynamo action in rapidly rotating suns ...
  • Magnetic games between a planet and its host star: the key role of topology 

    Strugarek, Antoine; Brun, Allan Sacha; Matt, Sean P.; Réville, Victor (Institute of Physics Publishing, 2015-12-20)
    Magnetic interactions between a star and a close-in planet are postulated to be a source of enhanced emissions and to play a role in the secular evolution of the orbital system. Close-in planets generally orbit in the ...
  • Magnetic imaging by x-ray holography using extended references 

    Duckworth, Thomas A.; Ogrin, Feodor Y.; Dhesi, Sarnjeet S.; Langridge, Sean; Whiteside, Amy; Moore, Thomas; Beutier, Guillaume; van der Laan, Gerrit (Optical Society of America, 2011)
    We demonstrate magnetic lensless imaging by Fourier transform holography using extended references. A narrow slit milled through an opaque gold mask is used as a holographic reference and magnetic contrast is obtained by ...
  • Magnetic processes in astrophysics: theory, simulations, experiments 

    Browning, Matthew K. (Taylor & Francis, 2014-10-21)
    Book Review Magnetic processes in astrophysics: theory, simulations, experiments, by Gunther Rudiger, Rainer Hollerbach, and Leonid L. Kitchatinov, Wiley-VCH Verlag GmbH & Co. KGaA, Boschstr. 12, 69469 Weinheim, Germany, ...
  • Magnetic second harmonic generation at the Co2MnSi/AlO x interface 

    Shelford, L.R.; Liu, Y.; Hicken, R.J.; Sakuraba, Y.; Oogane, M.; Ando, Y. (American Institute of Physics, 2008)
    We have studied magnetic second harmonic generation (MSHG) at the Co2MnSi/AlOx interface. The variation of the MSHG intensity was consistent with the nonvanishing components of the nonlinear susceptibility tensor expected ...
  • Magnetization reversal processes in epitaxial Fe/GaAs(001) films 

    Daboo, C.; Hicken, R.J.; Eley, D.E.P.; Gester, M.; Gray, S.J.; Ives, A.J.R.; Bland, J.A.C. (American Institute of Physics, 1994)
    In this article we present the results of a detailed study of the switching behavior observed in epitaxial single Fe films of thickness between 30 and 450 Å, and a wedge shaped Fe film with a thickness range of 10–60 Å ...
  • Magnetometry of low-dimensional electron and hole systems 

    Usher, Alan; Elliott, Martin (Institute of Physics, 2009)
    The high-magnetic-field, low-temperature magnetic properties of low-dimensional electron and hole systems reveal a wealth of fundamental information. Quantum oscillations of the thermodynamic equilibrium magnetization yield ...
  • Magnonic beam splitter: The building block of parallel magnonic circuitry 

    Sadovnikov, AV; Davies, CS; Grishin, SV; Kruglyak, VV; Romanenko, DV; Sharaevskii, YP; Nikitov, SA (American Institute of Physics, 2015-05-13)
    © 2015 AIP Publishing LLC. We demonstrate a magnonic beam splitter that works by inter-converting magnetostatic surface and backward-volume spin waves propagating in orthogonal sections of a T-shaped yttrium iron garnet ...
  • Making geometrical optics exact 

    Philbin, Thomas G. (Taylor and Francis, 2014-03-17)
    Geometrical optics (GO) is widely used in studies of electromagnetic materials because of its ease of use compared to full-wave numerical simulations. Exact solutions for waves can, however, differ significantly from the ...
  • Making microscopy count: quantitative light microscopy of dynamic processes in living plants 

    Fricker, Mark D.; Moger, Julian; Littlejohn, George; Deeks, Michael (Wiley / Royal Microscopical Society, 2016)
    Cell theory has officially reached 350 years of age as the first use of the word ‘cell’ in a biological context can be traced to a description of plant material by Robert Hooke in his historic publication “Micrographia: ...
  • Making Tunnel Barriers (Including Metals) Transparent 

    Hooper, Ian R.; Preist, T. W.; Sambles, J. Roy (American Physical Society, 2006)
    The classical "brick wall," which may, according to quantum mechanics, leak via tunneling, is here shown to be completely transparent when appropriate impedance matching media are placed both in front of and behind the ...
  • Marginalizing instrument systematics in HST WFC3 transit light curves 

    Wakeford, H; Sing, David K.; Evans, T; Deming, D; Mandell, A (American Astronomical Society, 2016-02-23)
    Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) infrared observations at 1.1–1.7 μm probe primarily the H2O absorption band at 1.4 μm, and have provided low-resolution transmission spectra for a wide range of ...
  • The Mass-Dependence of Angular Momentum Evolution in Sun-Like Stars 

    Matt, Sean P.; Brun, Allan Sacha; Baraffe, I.; Bouvier, Jerome; Chabrier, G. (American Astronomical Society, 2015)
    To better understand the observed distributions of rotation rate and magnetic activity of sun-like and low-mass stars, we derive a physically motivated scaling for the dependence of the stellar-wind torque on Rossby number. ...
  • The masses, radii and luminosities of the components of U Geminorum 

    Naylor, T; Allan, A; Long, KS (Oxford University Press, 2005-08-01)
    We present a phase-resolved spectroscopic study of the secondary star in the cataclysmic variable (CV) U Gem. We use our data to measure the radial velocity semi-amplitude, systemic velocity and rotational velocity of the ...