Search Publications
Cometary science after Rosetta
Knight, Matthew M.; Jones, Geraint H.; Fitzsimmons, Alan +1 more
The European Space Agency's Rosetta mission ended operations on 30 September 2016 having spent over 2 years in close proximity to its target comet, 67P/Churyumov-Gerasimenko. Shortly before this, in summer 2016, a discussion meeting was held to examine how the results of the mission could be framed in terms of cometary and solar system science in …
Suzaku observations of spectral variations of the ultra-luminous X-ray source Holmberg IX X-1
Makishima, Kazuo; Nakazawa, Kazuhiro; Kobayashi, Shogo B.
Observations of the ultra-luminous X-ray source (ULX) Holmberg IX X-1 were carried out with Suzaku twice, once on 2012 April 13 and then on 2012 October 24, with exposures of 180 ks and 217 ks, respectively. The source showed a hard power-law shaped spectrum with a mild cutoff at ∼8 keV, which is typical of ULXs when they are relatively dim. On bo…
Turbulent processes in Earth's magnetosheath by Cluster mission measurements
Lui, A. T. Y.; Kronberg, E. A.; Kozak, L. V. +1 more
Methods and approaches which can be used for the analysis of hydrodynamic and magnetohydrodynamic turbulent flows are chosen for this study. It is defined that the best methods for determination of turbulent process types are the methods of statistical physics. Within the statistical approach the fractal analysis (height of the maximum of probabil…
Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst
Udalski, A.; Coe, M. J.; Bird, A. J. +6 more
We present simultaneous, multiwavelength observations of the Small Magellanic Cloud Be/XRB IGR J01217-7257 (=SXP 2.16) during outbursts in 2014, 2015 and 2016. We also present the results of the RXTE observations of the Small Magellanic Cloud during which the source was initially discovered with a periodicity of 2.1652 ± 0.0001 s that we associate…
Ionospheric Electron Densities at Mars: Comparison of Mars Express Ionospheric Sounding and MAVEN Local Measurements
Gurnett, D. A.; Němec, F.; Morgan, D. D. +5 more
We present the first direct comparison of Martian ionospheric electron densities measured by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) topside radar sounder on board the Mars Express spacecraft and by the Langmuir Probe and Waves (LPW) instrument on board the Mars Atmosphere and Volatile Evolution Mission (MAVEN) spa…
A Jupiter-mass planet around the K0 giant HD 208897
Yılmaz, M.; Sato, B.; Bikmaev, I. +9 more
For over 10 years, we have carried out a precise radial velocity (RV) survey to find substellar companions around evolved G, K-type stars to extend our knowledge of planet formation and evolution. We performed high precision RV measurements for the giant star
Time Evolution of Elemental Ratios in Solar Energetic Particle Events
Dalla, S.; Cohen, C. M. S.; Mewaldt, R. A. +1 more
Heavy ion ratio abundances in solar energetic particle (SEP) events, e.g., Fe/O, often exhibit decreases over time. Using particle instruments on the Advanced Composition Explorer, Solar and Heliospheric Observatory and Solar Terrestrial Relations Observatory spacecraft, we analyzed heavy ion data from 4 SEP events taking place between 2006 Decemb…
De-noising the galaxies in the Hubble XDF with EMPCA
Maturi, Matteo
We present a method to model optical images of galaxies using expectation maximization principal components analysis. The method returns de-noised images, it relies on the data alone and does not assume any pre-established model or fitting formula. It preserves the statistical properties of the sample, minimizing possible biases. The precision of …
Just how hot are the ω Centauri extreme horizontal branch pulsators?
Ely, J.; Latour, M.; Chayer, P. +5 more
Context. Past studies based on optical spectroscopy suggest that the five
Study of ice-related flow features around Tanaica Montes, Mars: Implications for late amazonian debris-covered glaciation
Vijayan, S.; Sinha, Rishitosh K.; Bharti, Rajiv R.
Lobate debris aprons (LDA) and lineated valley fill (LVF) have been broadly recognized in the mid-latitudes of Mars and their subsequent analyses using data from the SHAllow RADar (SHARAD) instrument has suggested evidence for contemporary ice preserved beneath these features. In this study, we conduct detailed characterization of newly identified…