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Magnetic Doppler imaging of the chemically peculiar star HD 125248
Ilyin, I.; Ryabchikova, T.; Kochukhov, O. +1 more
Context. Intermediate-mass, chemically peculiar stars with strong magnetic fields provide an excellent opportunity to study the topology of their surface magnetic fields and the interplay between magnetic geometries and abundance inhomogeneities in the atmospheres of these stars.
Aims: We reconstruct detailed maps of the surface magnetic fiel…
Coronal mass ejection-related particle acceleration regions during a simple eruptive event
Rouillard, Alexis P.; Klein, Karl-Ludwig; Salas-Matamoros, Carolina
An intriguing feature of many solar energetic particle (SEP) events is the detection of particles over a very extended range of longitudes in the heliosphere. This may be due to peculiarities of the magnetic field in the corona, to a broad accelerator, to cross-field transport of the particles, or to a combination of these processes. The eruptive …
Constraining the physical properties of Titan's empty lake basins using nadir and off-nadir Cassini RADAR backscatter
Zebker, H. A.; Hayes, A. G.; Malaska, M. J. +5 more
We use repeat synthetic aperture radar (SAR) observations and complementary altimetry passes acquired by the Cassini spacecraft to study the scattering properties of Titan's empty lake basins. The best-fit coefficients from fitting SAR data to a quasi-specular plus diffuse backscatter model suggest that the bright basin floors have a higher dielec…
The NuSTAR view of the non-thermal emission from PSR J0437-4715
Harrison, F. A.; Boggs, S.; Stern, D. +11 more
We present a hard X-ray Nuclear Spectroscopic Telescope Array (NuSTAR) observation of PSR J0437-4715, the nearest millisecond pulsar. The known pulsations at the apparent pulse period {∼ }5.76{ ms} are observed with a significance of 3.7σ, at energies up to 20 keV above which the NuSTAR background dominates. We measure a photon index Γ = 1.50 ± 0.…
HD 41641: A classical δ Sct-type pulsator with chemical signatures of an Ap star
Ryabchikova, T.; Poretti, E.; Michel, E. +8 more
Context. Among the known groups of pulsating stars, δ Sct stars are one of the least understood. Theoretical models do not predict the oscillation frequencies that observations reveal. Complete asteroseismic studies are necessary to improve these models and better understand the internal structure of these targets.
Aims: We study the δ Sct st…
The bulge-disc decomposition of AGN host galaxies
Dunlop, J. S.; Kocevski, D. D.; Rosario, D. J. +3 more
We present the results from a study of the morphologies of moderate luminosity X-ray-selected active galactic nuclei (AGN) host galaxies in comparison to a carefully mass-matched control sample at 0.5 < z < 3 in the CANDELS GOODS-S field. We apply a multiwavelength morphological decomposition analysis to these two samples and report on the d…
A Stellar Velocity Dispersion for a Strongly-lensed, Intermediate-mass Quiescent Galaxy at z=2.8
Franx, Marijn; Muzzin, Adam; van de Sande, Jesse +1 more
Measuring stellar velocity dispersions of quiescent galaxies beyond z∼ 2 is observationally challenging. Such measurements require near-infrared spectra with a continuum detection of at least moderate signal to noise, often necessitating long integrations. In this paper, we present deep X-Shooter spectroscopy of one of only two known gravitational…
Complex explosive volcanic activity on the Moon within Oppenheimer crater
Bell, James F.; Horgan, Briony H. N.; Hayne, Paul O. +5 more
Oppenheimer crater is a floor-fractured crater located within the South Pole-Aitken basin on the Moon, and exhibits more than a dozen localized pyroclastic deposits associated with the fractures. Localized pyroclastic volcanism on the Moon is thought to form as a result of intermittently explosive Vulcanian eruptions under low effusion rates, in c…
Searching for calcium-aluminum-rich inclusions in cometary particles with Rosetta/COSIMA
Stenzel, Oliver; Kissel, Jochen; Hilchenbach, Martin +2 more
The calcium-aluminum-rich inclusions (CAIs) found in chondritic meteorites are probably the oldest solar system solids, dating back to 4567.30 ± 0.16 million years ago. They are thought to have formed in the protosolar nebula within a few astronomical units of the Sun, and at a temperature of around 1300 K. The Stardust mission found evidence of C…
Constraints on LISA Pathfinder’s self-gravity: design requirements, estimates and testing procedures
Mendes, L.; Madden, S.; Russano, G. +96 more
LISA Pathfinder satellite was launched on 3 December 2015 toward the Sun-Earth first Lagrangian point (L1) where the LISA Technology Package (LTP), which is the main science payload, will be tested. LTP achieves measurements of differential acceleration of free-falling test masses (TMs) with sensitivity below 3× {10}-14 {{m}} {{{s}}}