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Plateaus and sinuous ridges as the fingerprints of lava flow inflation in the Eastern Tharsis Plains of Mars
Williams, David A.; Bleacher, Jacob E.; Crumpler, Larry S. +5 more
The Tharsis Montes rift aprons are composed of outpourings of lava from chaotic terrains to the northeast and southwest flank of each volcano. Sinuous and branching channel networks that are present on the rift aprons suggest the possibility of fluvial processes in their development, or erosion by rapidly emplaced lavas, but the style of lava flow…
A Challenging View of the 2015 Summer V404 Cyg Outburst at High Energy with INTEGRAL/SPI: The Finale
Jourdain, Elisabeth; Roques, Jean-Pierre; Rodi, James
During its strong outburst of 2015 June/July, the X-ray transient V404 Cygni (=GS2023+338) was observed up to a level of 50 Crab in the hard X-ray domain. We focus here on a particularly intense episode preceeding a definitive decline of the source activity. We benefit from large signal-to-noise ratios to investigate the source spectral variabilit…
Sulphur isotope mass-independent fractionation observed in comet 67P/Churyumov-Gerasimenko by Rosetta/ROSINA
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +12 more
The knowledge about sulphur isotopic fractionation in volatile cometary species is limited as only measurements in five comets have been done and only for 34S/32S. The lack of information about the fractionation of 33S/32S makes it impossible to compare them with what is known from refractories. We prese…
CONSERT constrains the internal structure of 67P at a few metres size scale
Plettemeier, Dirk; Kofman, Wlodek; Herique, Alain +6 more
The internal properties of cometary nuclei are the best clues to the size distribution and properties of the early planetesimals that formed the planets during the early Solar system nebula processes. The CONSERT radar was designed to probe the interior of comet 67P/Churyumov-Gerasimenko with a wavelength of about 3 m. It was successfully operated…
Global permittivity mapping of the Martian surface from SHARAD
Mège, Daniel; Gurgurewicz, Joanna; Castaldo, Luigi +2 more
SHARAD is a subsurface sounding radar aboard NASA's Mars Reconnaissance Orbiter, capable of detecting dielectric discontinuities in the subsurface caused by compositional and/or structural changes. Echoes coming from the surface contain information on geometric properties at metre scale and on the permittivity of the upper layers of the Martian cr…
A Controlled Study of Cold Dust Content in Galaxies from z = 0-2
Kartaltepe, Jeyhan S.; Kirkpatrick, Allison; Kocevski, Dale D. +12 more
At z=1{--}3, the formation of new stars is dominated by dusty galaxies whose far-IR emission indicates they contain colder dust than local galaxies of a similar luminosity. We explore the reasons for the evolving IR emission of similar galaxies over cosmic time using (1) local galaxies from GOALS ({L}{IR}={10}11{--}{10}1…
Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation
Rizzi, L.; Karachentsev, I. D.; Makarova, L. N. +2 more
We present a photometric study of the Andromeda XVIII dwarf spheroidal galaxy associated with M31, and situated well outside of the virial radius of the M31 halo. The galaxy was resolved into stars with Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) revealing the old red giant branch and red clump. With the new observational data, we…
The near-surface electron radiation environment of Saturn's moon Mimas
Coates, A. J.; Jones, G. H.; Hendrix, A. R. +4 more
Saturn's inner mid-size moons are exposed to a number of external weathering processes, including charged particle bombardment and UV photolysis, as well as deposition of E-ring grains and interplanetary dust. While optical remote sensing observations by several instruments onboard the Cassini spacecraft have revealed a number of weathering patter…
Inversion of the decay of the cyclotron line energy in Hercules X-1
Harrison, F.; Klochkov, D.; Wilms, J. +3 more
Recent observations of Her X-1 with NuSTAR and INTEGRAL in 2016 have provided evidence that the 20-year decay of the cyclotron line energy found between 1996 and 2015 has ended and that an inversion with a new increase, possibly similar to the one observed around 1990-1993, has started. We consider this a strong motivation for further observations…
The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica
Christille, J. -M.; Lagrange, A. -M.; Chapellier, E. +13 more
Aims: The Antarctica Search for Transiting Extrasolar Planets (ASTEP), an automatized 400 mm telescope located at Concordia station in Antarctica, monitored β Pictoris continuously to detect any variability linked to the transit of the Hill sphere of its planet β Pictoris b. The long observation sequence, from March to September 2017, combine…