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Local bow shock environment during magnetosheath jet formation: results from a hybrid-Vlasov simulation
Pfau-Kempf, Yann; Ganse, Urs; Battarbee, Markus +11 more
Magnetosheath jets are plasma structures that are characterised by enhanced dynamic pressure and/or plasma velocity. In this study, we investigate the formation of magnetosheath jets in four two-dimensional simulation runs of the global magnetospheric hybrid-Vlasov model Vlasiator. We focus on jets whose origins were not clearly determined in a pr…
The broadening of the main sequence in the open cluster M38
Salaris, M.; Bedin, L. R.; Cassisi, S. +1 more
Our recent multiband photometric study of the colour width of the lower main sequence of the open cluster M37 has revealed the presence of a sizeable initial chemical composition spread in the cluster. If initial chemical composition spreads are common amongst open clusters, this would have major implications for cluster formation models and the f…
Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40
Donati, J. -F.; Collier Cameron, A.; Hussain, G. A. J. +3 more
We present a Zeeman-Doppler imaging study of two weak-line T Tauri stars TAP 4 and TAP 40, based on the high-resolution spectropolarimetric observations with ESPaDOnS at the Canada-France-Hawaii Telescope in November 2013, in the framework of the Magnetic Topologies of Young Stars and Survival of close-in giant Exoplanets large programme. We apply…
Spectral study of the Galactic ridge X-ray emission with Suzaku: Comparison of the spectral shape with point sources
Nobukawa, Masayoshi; Uchiyama, Hideki; Nobukawa, Kumiko K. +2 more
The Galactic ridge X-ray emission (GRXE) is unresolved X-ray emission located on the Galactic plane, and whether the GRXE comes from truly diffuse plasma or unresolved point sources is still debatable. We present results of spectral analysis of the GRXE with Suzaku. In order to examine the point source origin, we fitted the GRXE spectra in the 1.2…
Testing quasi-linear modified Newtonian dynamics theory with Galactic globular clusters in a weak external field
Calura, F.; Baumgardt, H.; Sollima, A. +2 more
We developed self-consistent dynamical models of stellar systems in the framework of quasi-linear modified Newtonian dynamics (QUMOND). The models are constructed from the anisotropic distribution function of Gunn and Griffin, combined with the modified Poisson equation defining this gravitation theory and take into account the external field effe…
ALMA Millimeter/Submillimeter Sources among Spitzer SMUVS Galaxies at z > 2 in the COSMOS Field
Caputi, Karina I.; Suzuki, Tomoko L.; van Mierlo, Sophie E.
Submillimeter observations reveal the star formation activity obscured by dust in the young Universe. It still remains unclear how galaxies detected at submillimeter wavelengths are related to ultraviolet/optical-selected galaxies in terms of their observed quantities, physical properties, and evolutionary stages. Deep near- and mid-infrared obser…
A multiyear photopolarimetric study of the semi-regular variable V CVn and identification of analog sources
Ignace, R.; Simpson, J.; Shrestha, M. +4 more
The semi-regular variable star V Canum Venaticorum (V CVn) is well known for its unusual linear polarization position angle (PA). Decades of observing V CVn reveal a nearly constant PA spanning hundreds of pulsation cycles. This phenomenon has persisted through variability that has varied by two magnitudes in optical brightness and through variabi…
Investigation of mid-infrared long-term variability of dusty AGB stars using multi-epoch scan data of AKARI and WISE
Takita, Satoshi; Ita, Yoshifusa; Tachibana, Kengo +5 more
Asymptotic giant branch (AGB) stars are one of the main sources of dust in the Universe. They form and supply dust triggered by stellar pulsations, but the details of the mechanism are still unknown. Among all AGB stars, dusty AGB stars are the most important in terms of dust supply because they contain the star with a high mass-loss rate. To inve…
A spectroscopic measurement of high velocity spray plasma from an M-class flare and coronal mass ejection
Young, Peter R.
The M1.5-class flare and associated coronal mass ejection (CME) of 16 February 2011 was observed with the Extreme ultraviolet Imaging Spectrometer on board the Hinode spacecraft. Spray plasma associated with the CME is found to exhibit a Doppler blue-shift of 850 km s-1 - one of the largest values reported from spectroscopy of the solar…
Effect of the Eccentricity of the Planet's Orbit on the Limb Darkening Coefficients of the Eclipsed Star
Cherepashchuk, A. M.; Bekesov, E. V.
It is shown that the introduction of a small orbital eccentricity into the model of a binary system with an exoplanet, which is allowed by errors in determining the radial velocities of the eclipsed star, makes possible to significantly reduce and even eliminate the difference in the wavelength dependences between the observed and theoretical valu…