Now showing items 1-20 of 574

  • 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 (2016-08-24) - 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 ...
  • 3D MHD modeling of twisted coronal loops 

    Reale, F.; Orlando, S.; Guarrasi, M.; Mignone, A.; Peres, G.; Hood, A. W.; Priest, E. R. (2016-07-16) - 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 whole-prominence fine structure modeling 

    Gunar, Stanislav; Mackay, Duncan Hendry (2015-04-20) - Journal article
    We present the first 3D whole-prominence fine structure model. The model combines a 3D magnetic field configuration of an entire prominence obtained from nonlinear force-free field simulations, with a detailed description ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • The advantages of using a Lucky Imaging camera for observations of microlensing events 

    Sajadian, Sedighe; Rahvar, Sohrab; Dominik, Martin; Hundertmark, Markus (2016-05-21) - Journal article
    In this work, we study the advantages of using a Lucky Imaging camera for the observations of potential planetary microlensing events. Our aimis to reduce the blending effect and enhance exoplanet signals in binary lensing ...
  • Alfven wave phase-mixing and damping in the ion cyclotron range of frequencies 

    Threlfall, J.; McClements, K. G.; De Moortel, I. (2011-01) - Journal article
    Aims. We determine the effect of the Hall term in the generalised Ohm's law on the damping and phase mixing of Alfven waves in the ion cyclotron range of frequencies in uniform and non-uniform equilibrium plasmas. Methods. ...
  • Alignment in star-debris disc systems seen by Herschel 

    Greaves, Jane Sophia; Kennedy, G. M.; Thureau, N.; Eiroa, C.; Marshall, J. P.; Maldonado, J.; Matthews, B. C.; Olofsson, G.; Barlow, M. J.; Moro-Martin, A.; Sibthorpe, B.; Absil, O.; Ardila, D. R.; Booth, M.; Broekhoven-Fiene, H.; Brown, David John Alexander; Collier Cameron, A.; del Burgo, C.; Di Francesco, J.; Duchene, G.; Eisloffel, J.; Ertel, S.; Holland, W. S.; Horner, J.; Kalas, P.; Kavelaars, J. J.; Lestrade, J. -F.; Vican, L.; Wilner, D. J.; Wolf, S.; Wyatt, M. C. (2014-02-11) - Journal article
    Many nearby main-sequence stars have been searched for debris using the far-infrared Herschel satellite, within the DEBRIS, DUNES and Guaranteed-Time Key Projects. We discuss here 11 stars of spectral types A–M where the ...
  • ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38 

    Farihi, J.; Wyatt, M. C.; Greaves, J. S.; Bonsor, A.; Sibthorpe, B.; Panic, O. (2014-10-21) - Journal article
    ALMA Cycle 0 and Herschel PACS observations are reported for the prototype, nearest, and brightest example of a dusty and polluted white dwarf, G29-38. These long-wavelength programmes attempted to detect an outlying, ...
  • ALMA images of discs : are all gaps carved by planets? 

    Gonzalez, J.-F.; Laibe, Guillaume; Maddison, S.T.; Pinte, C.; Ménard, F. (2015-11-21) - Journal article
    Protoplanetary discs are now routinely observed and exoplanets, after the numerous indirect discoveries, are starting to be directly imaged. To better understand the planet formation process, the next step is the detection ...
  • Analysis of spin-orbit alignment in the WASP-32, WASP-38, and HAT-P-27/WASP-40 systems 

    Brown, David John Alexander; Cameron, Andrew Collier; Díaz, R. F.; Doyle, A. P.; Gillon, M.; Lendl, M.; Smalley, B.; Triaud, A. H. M. J.; Anderson, D. R.; Enoch, Becky; Hellier, C.; Maxted, P. F. L.; Miller, G. R. M.; Pollacco, D.; Queloz, D.; Boisse, I.; Hébrard, G. (2012-12-01) - Journal article
    We present measurements of the spin-orbit alignment angle, λ, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyze the Rossiter-McLaughlin ...
  • Anomalous motions in the Local Group : evidence of a past Milky Way–Andromeda flyby? 

    Banik, Indranil; Zhao, Hongsheng (2016-05-26) - Conference paper
    The expansion of the Universe is not homogeneous. In the Local Group (LG), Andromeda (M31) is approaching the Milky Way (MW) at ~110 km/s. To turn around the cosmic expansion locally to this extent, their combined mass ...
  • Apparent cross-field superslow propagation of magnetohydrodynamic waves in solar plasmas 

    Kaneko, T; Goossens, Marcel; Soler, Roberto; Terradas, Jaume; Van Doorsselaere, Tom; Yokoyama, T; Wright, Andrew Nicholas (2015-10-15) - Journal article
    In this paper we show that the phase mixing of continuum Alfvén waves and/or continuum slow waves in magnetic structures of the solar atmosphere as, e.g., coronal arcades, can create the illusion of wave propagation across ...