Search Publications
Mapping of the water ice content within the Martian surficial soil on the periphery of the retreating seasonal northern polar cap based on the TES and the OMEGA data
Christensen, P. R.; Kuzmin, R. O.; Zabalueva, E. V. +1 more
Analysis of seasonal data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) shows a significant increase in thermal inertia during autumn, winter and spring in the middle and high latitudes of Mars. At each stage of the northern seasonal polar cap's recession in spring a distinct high thermal inertia (HTI) annulus arises around the…
Micro-arcsecond Celestial Reference Frames: definition and realization — Impact of the recent IAU Resolutions
Capitaine, Nicole
The adoption of the International Celestial Reference System (ICRS), based on Very Long Baseline Interferometry (VLBI) observations of extragalactic radiosources by the International Astronomical Union (IAU) since 1998 January 1, opened a new era for astronomy. The ICRS and the corresponding frame, the International Celestial Reference Frame (ICRF…
Retrograde wind accretion - an alternative mechanism for long spin-period of SFXTs
Wang, J.; Chang, H. -K.
A new class of high-mass X-ray binaries (HMXBs) - supergiant fast X-ray transients (SFXTs) - are discovered by INTEGRAL, which are associated with OB supergiants and present long spin periods. Observational evidence indicates that some accreting neutron stars in HMXBs display accretion reversals. It has been suggested that the inverted torque can …
An X-ray/optical study of the geometry and dynamics of MACS J0140.0-0555, a massive post-collision cluster merger
Richard, Johan; Ho, I. -Ting; Ebeling, Harald
We investigate the physical properties, geometry and dynamics of the massive cluster merger MACS J0140.0-0555 (z = 0.451) using X-ray and optical diagnostics. Featuring two galaxy overdensities separated by about 250 kpc in projection on the sky, and a single peak in the X-ray surface brightness distribution located between them, MACS J0140.0-0555…
The first results from the Herschel-HIFI mission
van der Tak, Floris
This paper contains a summary of the results from the first years of observations with the HIFI instrument onboard ESA's Herschel space observatory. The paper starts by outlining the goals and possibilities of far-infrared and submillimeter astronomy, the limitations of the Earth's atmosphere, and the scientific scope of the Herschel-HIFI mission.…
HST/STIS observations and simulation of Io's emission spectrum in Jupiter shadow: Probing Io's Jupiter-facing eclipse atmosphere
Trafton, L. M.; McGrath, M. A.; Goldstein, D. B. +2 more
We report the detection of SO2 emission from Io in Jupiter's shadow, peaking near 26 Rayleigh/Å around 3150 Å, and emission from its associated excitation-dissociation products, SO in the 2550 Å band and S I in the 1800 and 1900 Å multiplets. In addition, an unidentified emission spectrum was discovered between ∼4100 Å and ∼5700 Å, whic…
Decametric radio bursts associated with the 13 July 2004 CME event at frequencies 10-30 MHz
Rucker, H. O.; Konovalenko, A. A.; Melnik, V. N. +3 more
We report on the observations of solar type IV burst and its precursors on the 13 of July 2004 at frequencies 10-30 MHz. The radio telescope UTR-2 observational data compiled from SOHO, WIND, NDA, RHESSI, GOES data were used. The main properties (frequency drift rate, duration, flux) of type IV burst and its precursors, namely solar type III and t…
Misleading variations in estimated rotational frequency splittings of solar p modes: consequences for helioseismology and asteroseismology
Chaplin, William J.; García, Rafael A.; Mathur, Savita +4 more
The aim of this paper is to investigate whether there are any 11-yr or quasi-biennial solar-cycle-related variations in solar rotational splitting frequencies of low-degree solar p modes. Although no 11-yr signals were observed, variations on a shorter time-scale (∼2 yr) were apparent. We show that the variations arose from complications/artefacts…
Super resolution from diffraction limited images with kernel-phases
Martinache, Frantz
Kernel-phase is a recently developed paradigm to tackle the classical problem of image deconvolution, based on an interferometric point of view of image formation. Kernel-phase inherits and borrows from the notion of closure-phase, especially as it is used in the context of non-redundant Fizeau interferometry, but extends its application to pupils…
Dramatic Infrared Variability of WISE J1810-3305: Catching Early-time Dust Ejection During the Thermal Pulse of an Asymptotic Giant Branch Star?
Gandhi, Poshak; Yamamura, Issei; Takita, Satoshi
We present the discovery of a source with broadband infrared photometric characteristics similar to Sakurai's object. WISE J180956.27-330500.2 (hereafter J1810-3305) shows very red WISE colors, but a very blue 2MASS [K] versus WISE [W1 (3.4 µm)] color. It was not visible during the IRAS era, but now has a 12 µm flux well above the IRAS…