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Influence of an Upstream Dynamic Pressure Pulse on Venus-Solar Wind Interaction by Multispecies Magnetohydrodynamic Simulation
Cao, Jinbin; Li, Yun; Xiong, Ruijing +4 more
As an unmagnetized planet, Venus does not have a global dipole magnetic field like Earth. The solar wind interacts directly with the Venusian ionosphere. In this paper, the interaction between solar wind and the Venusian upper atmosphere is investigated by conducting a three-dimensional multispecies magnetohydrodynamic (MHD) model, in which the Ve…
Study of a sample of faint Be stars in the exofield of CoRoT. III. Global spectroscopic characterization and astrophysical parameters of the central stars
Frémat, Y.; Zorec, J.; Hubert, A. M. +1 more
Context. The search and interpretation of non-radial pulsations from Be star light curves observed with the CoRoT satellite requires high-quality stellar astrophysical parameters.
Aims: The present work is devoted to the spectroscopic study of a sample of faint Be stars observed by CoRoT in the fourth long run (LRA02).
Methods: The astro…
Characterising the interior of five inner Saturnian moons using Cassini ISS data
Lainey, V.; Rambaux, N.; Zhang, Q. +2 more
Context. The Cassini-Huygens space mission provided a huge amount of data for the Saturnian system. While the mission ended in September 2017, there is still much information to be retrieved from the data.
Aims: Here, from their orbital motion, we infer the interior of the five inner Saturnian moons, Atlas, Prometheus, Pandora, Janus, and Epi…
A statistical analysis of the structure of the interstellar medium in the disc of the Milky Way
Whitworth, A. P.; Bates, M. L.
We construct Convolutional Neural Networks (CNNs) trained on exponentiated fractional Brownian motion (xfBm) images, and use these CNNs to analyse Hi-GAL images of surface density in the Galactic Plane. The CNNs estimate the Hurst parameter, ${\cal H}$ (a measure of the power spectrum), and the scaling exponent, ${\cal S}$ (a measure of the range …
Debris rings from extrasolar irregular satellites
Hansen, Bradley M. S.; Hayakawa, Kevin T.
Irregular satellites are the minor bodies found orbiting all four Solar system giant planets, with large semimajor axes, eccentricities, and inclinations. Previous studies have determined that the Solar system's irregular satellites are extremely collisionally evolved populations today, having lost ~99 per cent of their initial mass over the cours…
L 363-38 b: A planet newly discovered with ESPRESSO orbiting a nearby M dwarf star
Sartori, Lia F.; Lendl, Monika; Cugno, Gabriele +7 more
Context. Planets around stars in the solar neighbourhood will be prime targets for characterisation with upcoming large space- and ground-based facilities. Since large-scale exoplanet searches will not be feasible with such telescopes, it is crucial to use currently available data and instruments to find possible target planets before next-generat…
VISIONS: the VISTA Star Formation Atlas. II. The data processing pipeline
Meingast, Stefan; Rottensteiner, Alena; Bouy, Hervé +3 more
The VISIONS public survey provides large-scale, multi-epoch imaging of five nearby star-forming regions at sub-arcsecond resolution in the near-infrared. All data collected within the program and provided by the European Southern Observatory (ESO) science archive are processed with a custom end-to-end pipeline infrastructure to provide science-rea…
The Large Imaging Spectrometer for Solar Accelerated Nuclei (LISSAN): A Next-Generation Solar γ-ray Spectroscopic Imaging Instrument Concept
Volpara, Anna; Massa, Paolo; Krucker, Säm +34 more
Models of particle acceleration in solar eruptive events suggest that roughly equal energy may go into accelerating electrons and ions. However, while previous solar X-ray spectroscopic imagers have transformed our understanding of electron acceleration, only one resolved image of γ-ray emission from solar accelerated ions has ever been produced. …
The Chemodynamical Nature of the Triangulum-Andromeda Overdensity
Placco, Vinicius M.; Limberg, Guilherme; Rossi, Silvia +7 more
We present a chemodynamical study of the Triangulum-Andromeda overdensity (TriAnd) employing a sample of 31 candidate stars observed with the GRACES high-resolution (R = 40,000) spectrograph at the Gemini North (8.1 m) telescope. TriAnd is a stellar substructure found toward the outer disk of the Milky Way, located at R GC ~ 18 kpc from…
Topographical analysis of a candidate subglacial water region in Ultimi Scopuli, Mars
Mitri, Giuseppe; Genova, Antonio; Sulcanese, Davide +3 more
Radar signals of the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) instrument at the base of the South Polar Layered Deposits (SPLD) in the region known as Ultimi Scopuli, on Mars, have been interpreted as reflections from putative subglacial standing bodies of liquid water. The interpretation of the MARSIS radar signals is n…