Search Publications
Incomplete cooling down of Saturn's A ring at solar equinox: Implication for seasonal thermal inertia and internal structure of ring particles
Spilker, Linda; Deau, Estelle; Morishima, Ryuji +2 more
At the solar equinox in August 2009, the Composite Infrared Spectrometer (CIRS) onboard Cassini showed the lowest Saturn's ring temperatures ever observed. Detailed radiative transfer models show that the observed equinox temperatures of Saturn's A ring are much higher than model predictions as long as only the flux from Saturn is taken into accou…
Near-infrared spectra of liquid/solid acetylene under Titan relevant conditions and implications for Cassini/VIMS detections
Le Mouélic, S.; Cornet, T.; McCord, T. B. +6 more
Acetylene is thought to be abundant on Titan according to most photochemical models. While detected in the atmosphere, its likely presence at the surface still lacks physical evidence. It is thought that solid acetylene could be a major component of Titan's lakes shorelines and dry lakebed, detected as the 5 µm-bright deposits with the Cassi…
Evidence for Non-stellar Rest-frame Near-IR Emission Associated with Increased Star Formation in Galaxies at z ~ 1
van Dokkum, Pieter G.; Franx, Marijn; Brammer, Gabriel +5 more
We explore the presence of non-stellar rest-frame near-IR (2-5 µm) emission in galaxies at z ∼ 1. Previous studies identified this excess in relatively small samples and suggested that such non-stellar emission, which could be linked to the 3.3 µm polycyclic aromatic hydrocarbons feature or hot dust emission, is associated with an incr…
Ground-based observation of the cyclic nature and temporal variability of planetary-scale UV features at the Venus cloud top level
Watanabe, Makoto; Imai, Masataka; Takahashi, Yukihiro +4 more
A planetary-scale bright and dark UV feature, known as the ;Y-feature,; rotates around Venus with a period of 4-5 days and has been long-time interpreted as planetary waves. When assuming this, its rotation period and spatial structure might help to understand the propagation of the planetary-scale waves and find out their role in the acceleration…
Data processing and visualisation in the Rosetta Science Ground Segment
Geiger, Bernhard
Rosetta is the first space mission to rendezvous with a comet. The spacecraft encountered its target 67P/Churyumov-Gerasimenko in 2014 and currently escorts the comet through a complete activity cycle during perihelion passage. The Rosetta Science Ground Segment (RSGS) is in charge of planning and coordinating the observations carried out by the s…
The extreme ultraviolet spectra of low-redshift radio-loud quasars
O'Dea, Christopher P.; Punsly, Brian; Reynolds, Cormac +1 more
This paper reports on the extreme ultraviolet (EUV) spectrum of three low-redshift (z ∼ 0.6) radio-loud quasars, 3C 95, 3C 57 and PKS 0405-123. The spectra were obtained with the Cosmic Origins Spectrograph of the Hubble Space Telescope. The bolometric thermal emission, Lbol, associated with the accretion flow is a large fraction of the…
On the Nature of the Small-scale Structure in the Cosmic Microwave Background Observed by PLANCK and WMAP
Verschuur, G. L.; Schmelz, J. T.
Small-scale features observed by Wilkinson Microwave Anisotropy Probe (WMAP) and PLANCK in the frequency range of 22-90 GHz show a nearly flat spectrum, which meets with expectations that they originate in the early universe. However, free-free emission from electrons in small angular scale galactic sources that suffer beam dilution very closely m…
Narrow-line X-Ray-selected Galaxies in the Chandra-COSMOS Field. II. Optically Elusive X-Ray AGNs
Civano, F.; Elvis, M.; Watson, M. G. +1 more
In the Chandra-COSMOS (C-COSMOS) survey, we have looked for X-ray-selected active galactic nuclei (AGNs), which are not detected as such in the optical, the so-called elusive AGNs. A previous study based on XMM-Newton and Sloan Digital Sky Survey observations has found a sample of 31 X-ray AGNs optically misclassified as star-forming (SF) galaxies…
Obliquities of Exoplanet Host Stars from Precise Distances and Stellar Angular Diameters
Quinn, Samuel N.; White, Russel J.
The next generation of exoplanet space photometry missions proposed by both NASA and ESA promise to discover small transiting planets around the nearest and brightest main-sequence stars. The physical and rotational properties of these stars, in conjunction with Gaia-precision distances, can be used to determine the inclination of the stellar rota…
Current sheet flapping in the near-Earth magnetotail: peculiarities of propagation and parallel currents
Nakamura, Rumi; Petrukovich, Anatoly A.; Artemyev, Anton V. +1 more
We consider series of tilted current sheet crossings, corresponding to flapping waves in the near-Earth magnetotail. We analyse Cluster observations from 2005 to 2009, when spacecraft visited the magnetotail neutral plane near X ∈ [ - 17, - 8], Y ∈ [ - 16, - 2] RE (in the GSM system). Large separation of spacecraft allows us …