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The ExoMars Schiaparelli Entry, Descent and Landing Demonstrator Module (EDM) System Design
Bayle, Olivier; Ball, Andrew J.; Blancquaert, Thierry +3 more
The Entry, Descent and Landing Demonstrator Module (EDM) named Schiaparelli, was the ESA-led Mars lander element of the ESA-Roscosmos ExoMars 2016 mission. Following launch on 14 March 2016 with the ExoMars Trace Gas Orbiter (TGO) and cruise to Mars, Schiaparelli separated for encounter with Mars to demonstrate entry, descent and landing technolog…
XMM and NuSTAR Observations of an Optically Quiescent Quasar
Gandhi, Poshak; Stern, Daniel; Mainieri, Vincenzo +3 more
Optically quiescent quasars (OQQs) represent a recently systematized class of infrared-luminous active galactic nuclei (AGNs) that have galaxy-like optical continua. They may represent an interesting, brief phase in the AGN life cycle, e.g., either cocooned within high-covering-factor media or indicative of recent triggering, though their nature r…
Solar System Science with the Orbiting Astronomical Satellite Investigating Stellar Systems (OASIS) Observatory
Hartogh, Paul; Anderson, Carrie M.; Tielens, Alexander +6 more
The overarching theme of the Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS), an Astrophysics MIDEX-class mission concept, is Following water from galaxies, through protostellar systems, to Earth's oceans. The OASIS science objectives address fundamental questions raised in "Pathways to Discovery in Astronomy and Astrophy…
Distances, extinctions, and stellar parameters for stars in SkyMapper DR3
Lin, Jane; Casagrande, Luca; Asplund, Martin
We present a Bayesian isochrone fitting machinery to derive distances, extinctions, and stellar parameters (Teff, log g, and $\rm [Fe/H]$) for stars in the SkyMapper data release 3 (DR3) survey. We complement the latter with photometry from Gaia, 2MASS, and AllWISE, in addition to priors on parallaxes and interstellar extinction. We fin…
Quantification of O2 formation during UV photolysis of water ice: H2O and H2O:CO2 ices
Linnartz, H.; Chuang, K. -J.; Fedoseev, G. +4 more
Context. The Rosetta and Giotto missions investigated the composition of the cometary comae of 67P/Churyumov-Gerasimenko and 1P/Halley, respectively. In both cases, a surprisingly large amount of molecular oxygen (O2) was detected and was well correlated with the observed abundances of H2O. Laboratory experiments simulating c…
Development of a cometosheath at comet 67P/Churyumov-Gerasimenko. A case study comparison of Rosetta observations
Nilsson, H.; Goetz, C.; Stenberg Wieser, G. +2 more
Context. The ionosphere of a comet is known to deflect the solar wind through mass loading, but the interaction is dependent on cometary activity. We investigate the details of this process at comet 67P using the Rosetta Ion Composition Analyzer.
Aims: This study aims to compare the interaction of the solar wind and cometary ions during two d…
The SDSS-Gaia View of the Color-Magnitude Relation for Blue Horizontal-branch Stars
Limberg, Guilherme; Rossi, Silvia; Perottoni, Hélio D. +3 more
We present an updated sample of blue horizontal-branch (BHB) stars selected from the photometric and spectroscopic data from Sloan Digital Sky Survey and its associated project Sloan Extension for Galactic Understanding and Exploration (SEGUE). With these data, we selected candidates for A-type stars in the color-color space and then a mixture mod…
Winter Weakening of Titan's Stratospheric Polar Vortices
Toigo, A. D.; Teanby, N. A.; Newman, C. E. +3 more
Polar vortices are a prominent feature in Titan's stratosphere. The Cassini mission has provided a detailed view of the breakdown of the northern polar vortex and formation of the southern vortex, but the mission did not observe the full annual cycle of the evolution of the vortices. Here we use a TitanWRF general circulation model simulation of a…
A multi-instrument investigation of the frequency stability of oscillations above the acoustic cut-off frequency with solar activity
Broomhall, A. -M.; Kiefer, R.; Kosak, K.
Below the acoustic cut-off frequency, oscillations are trapped within the solar interior and become resonant. However, signatures of oscillations persist above the acoustic cut-off frequency, and these travelling waves are known as pseudo-modes. Acoustic oscillation frequencies are known to be correlated with the solar cycle, but the pseudo-mode f…
IGR J18249-3243: a new GeV-emitting FR II and the emerging population of high-energy radio galaxies
Ricci, R.; Wieringa, M. H.; Giroletti, M. +10 more
The advent of new all-sky radio surveys such as the VLA Sky Survey and the Rapid ASKAP Continuum Survey, performed with the latest generation radio telescopes, is opening new possibilities on the classification and study of extragalactic γ-ray sources, specially the underrepresented ones like radio galaxies. In particular, the enhanced sensitivity…