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Is near-surface ice the driver of dust activity on 67P/Churyumov-Gerasimenko
Keller, H. U.; Hartogh, P.; Rezac, L. +1 more
Context. Mainly for historical reasons, nearly all of the current thermophysical models of dust activity rely on the poorly justified assumption of cohesionless dust lifted by a gas drag force against the weak nucleus gravity. The interpretation of Rosetta data and our understanding of comet activity is particularly sensitive to this assumption. <…
Origin of the wide-orbit circumbinary giant planet HD 106906. A dynamical scenario and its impact on the disk
Ducourant, C.; Teixeira, R.; Lagrange, A. -M. +4 more
Context. A giant planet has been recently resolved at a projected distance of 730 au from the tight pair of young (~13 Myr) intermediate-mass stars HD 106906AB in the Lower Centaurus Crux (LCC) group. The stars are surrounded by a debris disk which displays a ring-like morphology and strong asymmetries at multiple scales.
Aims: We aim to stud…
A neural network gravitational arc finder based on the Mediatrix filamentation method
Bom, C. R.; Makler, M.; Brandt, C. H. +1 more
Context. Automated arc detection methods are needed to scan the ongoing and next-generation wide-field imaging surveys, which are expected to contain thousands of strong lensing systems. Arc finders are also required for a quantitative comparison between predictions and observations of arc abundance. Several algorithms have been proposed to this e…
Boulder abundances and size-frequency distributions on Oxia Planum-Mars: Scientific implications for the 2020 ESA ExoMars rover
Quantin, Cathy; Pajola, Maurizio; Carter, John +4 more
This paper presents the abundances and the size-frequency distributions (SFD) of boulders identified on a sector of the prime landing site for the ExoMars 2020 rover, in Oxia Planum region. By means of a HiRISE image, boulders ≥ 1.75 m across have been identified and subdivided according to the two main Oxia Planum geological units: the Noachian c…
CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs
Harris, Hugh C.; Vrba, Frederick J.; Munn, Jeffrey A. +16 more
New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the program operated. For 124 of the stars, parallax determinations from other investigators have alr…
CLASH-VLT: constraints on f(R) gravity models with galaxy clusters using lensing and kinematic analyses
Grillo, C.; Balestra, I.; Rosati, P. +10 more
We perform a maximum likelihood kinematic analysis of the two dynamically relaxed galaxy clusters MACS J1206.2-0847 at z=0.44 and RXC J2248.7-4431 at z=0.35 to determine the total mass profile in modified gravity models, using a modified version of the MAMPOSSt code of Mamon, Biviano and Bou&apose. Our work is based on the kinematic and lensin…
Disproving the validated planets K2-78b, K2-82b, and K2-92b. The importance of independently confirming planetary candidates
Zucker, S.; Alonso, R.; Deleuil, M. +13 more
Context. Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres.
Aims: While selecting super-Earths suitable for further characterisation from the ground from a list of confirmed and validated exoplanets detected by K2, we found some suspicious cases that led to us…
Non-Gaussian Velocity Distributions in Solar Flares from Extreme Ultraviolet Lines: A Possible Diagnostic of Ion Acceleration
Fletcher, Lyndsay; Jeffrey, Natasha L. S.; Labrosse, Nicolas
In a solar flare, a large fraction of the magnetic energy released is converted rapidly to the kinetic energy of non-thermal particles and bulk plasma motion. This will likely result in non-equilibrium particle distributions and turbulent plasma conditions. We investigate this by analyzing the profiles of high temperature extreme ultraviolet emiss…
On the Collision Nature of Two Coronal Mass Ejections: A Review
Wang, Yuming; Shen, Fang; Shen, Chenglong +1 more
Observational and numerical studies have shown that the kinematic characteristics of two or more coronal mass ejections (CMEs) may change significantly after a CME collision. The collision of CMEs can have a different nature, i.e. inelastic, elastic, and superelastic processes, depending on their initial kinematic characteristics. In this article,…
Stellar Dynamics and Star Formation Histories of z ∼ 1 Radio-loud Galaxies
Bell, Eric F.; Maseda, Michael V.; van Dokkum, Pieter G. +18 more
We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L 3 GHz > 1023 W Hz-1) at 0.6 < z < 1. This sample is constructed by cross-matching galaxies from the deep VLT/VIMOS LEGA-C spectroscopic survey with the VLA 3 GHz data set. The LEGA-C cont…