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Interplanetary magnetic field structure at Saturn inferred from nanodust measurements during the 2013 aurora campaign
Kempf, S.; Kurth, W. S.; Postberg, F. +3 more
Interactions between the solar wind and planetary magnetospheres provide important diagnostic information about the magnetospheric dynamics. The lack of monitoring of upstream solar wind conditions at the outer planets, however, restrains the overall scientific output. Here we apply a new method, using Cassini nanodust stream measurements, to deri…
Utilizing Synthetic UV Spectra to Explore the Physical Basis for the Classification of Lambda Boötis Stars
Cheng, Kwang-Ping; Tarbell, Erik S.; Neff, James E. +6 more
Lambda Boo-type stars are a group of late B to early F-type Population I dwarfs that show mild to extreme deficiencies of iron-peak elements (up to 2 dex), but their C, N, O, and S abundances are near solar. This intriguing stellar class has recently regained the spotlight because of the directly imaged planets around a confirmed Lambda Boo star, …
Reconstructing merger timelines using star cluster age distributions: the case of MCG+08-11-002
Kewley, Lisa J.; Davies, Rebecca L.; U, Vivian +3 more
We present near-infrared imaging and integral field spectroscopy of the centre of the dusty luminous infrared galaxy merger MCG+08-11-002, taken using the Near InfraRed Camera 2 (NIRC2) and the OH-Suppressing InfraRed Imaging Spectrograph (OSIRIS) on Keck II. We achieve a spatial resolution of ∼25 pc in the K band, allowing us to resolve 41 star c…
Eclipsing the innermost accretion disc regions in AGN
Miniutti, G.; Dovčiak, M.; Sanfrutos, M. +1 more
Variable X-ray absorption has been observed in active galactic nuclei (AGN) on several time scales. Observations allow us to identify the absorber with clouds associated either with the clumpy torus (parsec scales, long timescales) or with the broad line region (BLR) (short timescales). In the latter, the cloud size has been estimated to be of the…
Probing the Lambda-DGP Braneworld model
Ravanpak, Arvin; Farajollahi, Hossein; Fadakar, Golnaz
We study cosmic dynamics in the context of the normal branch of the DGP braneworld model. Using current Planck data, we find the best fitting model and associated cosmological parameters in non-flat ΛDGP. With the transition redshift as a basic variable and statefinder parameters, our result shows that the Universe starts its accelerated expansion…
Spectroscopy from the Hubble Space Telescope Cosmic Origins Spectrograph of the Southern Nova-like BB Doradus in an Intermediate State
Szkody, Paula; Sion, Edward M.; Godon, Patrick +6 more
We present a spectral analysis of the spectrum from the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) of the southern VY Scl nova-like variable BB Doradus, obtained as part of a Cycle 20 HST/COS survey of accreting white dwarfs (WDs) in cataclysmic variables. BB Dor was observed with COS during an intermediate state with a low mass …
94 Ceti: a triple star with a planet and dust disc
Faramaz, V.; Wiegert, J.; Cruz-Saenz de Miera, F.
94 Ceti is a triple star system with a circumprimary gas giant planet and far-infrared excess. Such excesses around main sequence stars are likely due to debris discs, and are considered as signposts of planetary systems and, therefore, provide important insights into the configuration and evolution of the planetary system. Consequently, to learn …
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster NGC 362
Thompson, I. B.; Schwarzenberg-Czerny, A.; Rozyczka, M. +2 more
The field of the globular cluster NGC 362 was monitored between 1997 and 2015 in a search for variable stars. BV light curves were obtained for 151 periodic or likely periodic variable stars, over a hundred of which are new detections. Twelve newly detected variable stars are proper-motion members of the cluster: two SX Phe and two RR Lyr pulsator…
Nonlinear Waves in the Terrestrial Quasiparallel Foreshock
Nakariakov, V. M.; Hnat, B.; Kolotkov, D. Y. +2 more
We provide strongly conclusive evidence that the cubic nonlinearity plays an important part in the evolution of the large amplitude magnetic structures in the terrestrial foreshock. Large amplitude nonlinear wave trains at frequencies above the proton cyclotron frequency are identified after nonharmonic slow variations are filtered out by applying…
LOTUS: a low-cost, ultraviolet spectrograph
Marchant, J. M.; Steele, I. A.; Snodgrass, C. +10 more
We describe the design, construction and commissioning of a simple, low-cost long-slit spectrograph for the Liverpool Telescope. The design is optimized for near-UV and visible wavelengths and uses all transmitting optics. It exploits the instrument focal plane field curvature to partially correct axial chromatic aberration. A stepped slit provide…