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Perturbed distribution functions with accurate action estimates for the Galactic disc
Monari, G.; Ramos, P.; Siebert, A. +8 more
In the Gaia era, understanding the effects of the perturbations of the Galactic disc is of major importance in the context of dynamical modelling. In this theoretical paper we extend previous work in which, making use of the epicyclic approximation, the linearized Boltzmann equation had been used to explicitly compute, away from resonances, the pe…
Catalog of Wide Binary, Trinary and Quaternary Candidates from the Gaia Data Release 2 (Region ∣b∣ > 25°)
Zavada, Petr; Píška, Karel
The occurrence of multiple stars, dominantly binaries, is studied using the Gaia-ESA DR2 catalog. We apply the optimized statistical method that we previously developed for the analysis of 2D patterns. The field of stars is divided into a mosaic of small pieces that represent a statistical set for analysis. Specifically, data input is represented …
Observing EAGLE galaxies with JWST: predictions for Milky Way progenitors and their building blocks
Fattahi, Azadeh; Deason, Alis J.; Frenk, Carlos S. +1 more
We present predictions, derived from the EAGLE ΛCDM cosmological hydrodynamical simulations, for the abundance and properties of galaxies expected to be detected at high redshift by the James Webb Space Telescope (JWST). We consider the galaxy population as a whole and focus on the sub-population of progenitors of Milky Way (MW) analogues, defined…
Modeling a Coronal Mass Ejection as a Magnetized Structure with EUHFORIA
Singh, Jagdev; Asvestari, E.; Sindhuja, G. +1 more
We studied an Earth-directed coronal mass ejection (CME) that erupted on 2015 March 15. Our aim was to model the CME flux rope as a magnetized structure using the European Heliospheric Forecasting Information Asset (EUHFORIA). The flux rope from eruption data (FRED) output was applied to the EUHFORIA spheromak CME model. In addition to the geometr…
Millisecond Pulsars in Dense Star Clusters: Evolution, Scaling Relations, and the Galactic-center Gamma-Ray Excess
Ye, Claire S.; Fragione, Giacomo
The number of millisecond pulsars (MSPs) observed in Milky Way globular clusters has increased explosively in recent years, but the underlying population is still uncertain due to observational biases. We use state-of-the-art N-body simulations to study the evolution of MSP populations in dense star clusters. These cluster models span a wide range…
An Updated View of the Milky Way from Maser Astrometry
Immer, Katharina; Rygl, Kazi L. J.
Astrometric observations of maser sources in the Milky Way, using the Very Long Baseline Interferometry (VLBI) technique, have been exploited to determine the spiral structure of our Galaxy. Several major spiral arms have now been pinpointed in the first and second Galactic quadrants. Fundamental Galactic parameters such as the distance to the Gal…
Analysis of four solar occultations by Titan's atmosphere with the infrared channel of the VIMS instrument: Haze, CH4, CH3D, and CO vertical profiles
Rannou, P.; Vinatier, S.; Coutelier, M. +1 more
Titan, the largest satellite of Saturn, has a dense atmosphere mainly composed of nitrogen, methane at a percent level, and minor species. It is also covered by a thick and global photochemical organic haze. In the last two decades, the observations made by the Cassini orbiter and the Huygens probe have greatly improved our knowledge of Titan's sy…
Multiwavelength Mitigation of Stellar Activity in Astrometric Planet Detection
Solanki, Sami K.; Macintosh, Bruce; Krivova, Natalie +4 more
Astrometry has long been a promising technique for exoplanet detection. At the theoretical limits, astrometry would allow for the detection of smaller planets than previously seen by current exoplanet search methods, but stellar activity may make these theoretical limits unreachable. Astrometric jitter of a Sun-like star due to magnetic activity i…
Automated Detection of coronaL MAss Ejecta origiNs for Space Weather AppliCations (ALMANAC)
Morgan, Huw; Williams, Thomas
Alerts of potentially hazardous coronal mass ejection (CME) are based on the detection of rapid changes in remote observations of the solar atmosphere. This paper presents a method that detects and estimates the central coordinates of CME eruptions in Extreme Ultraviolet data, with the dual aim of providing an early alert, and giving an initial es…
An arid-semiarid climate during the Noachian-Hesperian transition in the Huygens region, Mars: Evidence from morphological studies of valley networks
Xiao, Long; Zhao, Jiannan; Yang, Yong +2 more
Fluvial activities play important roles in the geologic evolution of early Mars. As one of the most ancient fluvial features on Mars, the widely distributed valley networks (VNs) provide clues for understanding the early martian climate. Our study focuses on the morphological and hydrological features of VNs around the Huygens basin in the ancient…