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The color and binarity of (486958) 2014 MU69 and other long-range New Horizons Kuiper Belt targets
Stern, S. A.; Kavelaars, J. J.; Weaver, H. A. +9 more
The Hubble Space Telescope (HST) measured the colors of eight Kuiper Belt Objects (KBOs) that will be observed by the New Horizons spacecraft including its 2019 close fly-by target the Cold Classical KBO (486958) 2014 MU69. We find that the photometric colors of all eight objects are red, typical of the Cold Classical dynamical populati…
Heavy negative ion growth in Titan's polar winter
Coates, A. J.; Jones, G. H.; Wellbrock, A. +4 more
A significant but unexpected result of the Cassini mission was the discovery of heavy organic negative ions in Titan's ionosphere at altitudes between about 950 and 1400 km by the CAPS Electron Spectrometer (ELS). The heaviest ions were observed during the T16 fly-by with masses over 13 000 u/q. This is significantly higher than the maximum masses…
Gemini Imaging of the Host Galaxies of Changing-look Quasars
Anderson, Scott F.; Eracleous, Michael; Haggard, Daryl +4 more
Changing-look (CL) quasars are a newly discovered class of luminous active galactic nuclei that undergo rapid (≲10 yr) transitions between Type 1 and Type 1.9/2, with an associated change in their continuum emission. We characterize the host galaxies of four faded CL quasars using broadband optical imaging. We use gri images obtained with the Gemi…
Solar wind charge exchange in cometary atmospheres. I. Charge-changing and ionization cross sections for He and H particles in H2O
Alho, Markku; Simon Wedlund, Cyril; Nilsson, Hans +7 more
Context. Solar wind charge-changing reactions are of paramount importance to the physico-chemistry of the atmosphere of a comet, mass-loading the solar wind through an effective conversion of fast light solar wind ions into slow heavy cometary ions.
Aims: To understand these processes and place them in the context of a solar wind plasma inter…
MOA-bin-29b: A Microlensing Gas-giant Planet Orbiting a Low-mass Host Star
Soszyński, I.; Szymański, M. K.; Mróz, P. +34 more
We report the discovery of a gas-giant planet orbiting a low-mass host star in the microlensing event MOA-bin-29 that occurred in 2006. We find five degenerate solutions with the planet/host-star mass ratio of q ∼ 10-2. The Einstein radius crossing time of all models are relatively short (∼4-7 days), which indicates that the mass of hos…
Observations of solar small-scale magnetic flux-sheet emergence
Bello González, N.; Borrero, J. M.; Fischer, C. E. +1 more
Aims: Two types of flux emergence were recently discovered in numerical simulations: magnetic loops and magnetic sheet emergence. While magnetic loop emergence has been documented well in recent years using high-resolution full Stokes data from ground-based telescopes as well as satellites, magnetic sheet emergence is still an understudied pr…
LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode
Mendes, L.; Russano, G.; Nofrarias, M. +75 more
We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a series of "impulse" forces lasting a few seconds and separated by roughly 350 s periods of true free fall. This represents an al…
Supergiant Fast X-ray Transients uncovered by the EXTraS project: flares reveal the development of magnetospheric instability in accreting neutron stars
Esposito, Paolo; Belfiore, Andrea; Salvaterra, Ruben +5 more
The low luminosity, X-ray flaring activity, of the sub-class of high-mass X-ray binaries called Supergiant Fast X-ray Transients, has been investigated using XMM-Newton public observations, taking advantage of the products made publicly available by the EXTraS project. One of the goals of EXTraS was to extract from the XMM-Newton public archive in…
The CEMP star SDSS J0222-0313: the first evidence of proton ingestion in very low-metallicity AGB stars?
Salvadori, S.; Bonifacio, P.; Caffau, E. +9 more
Context. Carbon-enhanced metal-poor (CEMP) stars are common objects in the metal-poor regime. The lower the metallicity we look at, the larger the fraction of CEMP stars with respect to metal-poor stars with no enhancement in carbon. The chemical pattern of CEMP stars is diversified, strongly suggesting a different origin of the C enhancement in t…
Searching for g modes. II. Unconfirmed g-mode detection in the power spectrum of the time series of round-trip travel time
Corbard, T.; Appourchaux, T.
Context. The recent claims of g-mode detection have restarted the search for these potentially extremely important modes. The claimed detection of g modes was obtained from the analysis of the power spectrum of the time series of round-trip travel time of p modes.
Aims: The goal of this paper is to reproduce these results on which the claims …