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A possible architecture of the planetary system HR 8799
Krivov, A. V.; Löhne, T.; Neuhäuser, R. +4 more
HR 8799 is a nearby A-type star with a debris disk and three planetary candidates, which have been imaged directly. We undertake a coherent analysis of various observational data for all known components of the system, including the central star, imaged companions, and dust. Our goal is to elucidate the architecture and evolutionary status of the …
A "Firework" of H2 Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)
Smith, M. D.; Tanaka, I.; Zijlstra, A. A. +6 more
We present a deep and wide field-of-view (4' × 7') image of the planetary nebula (PN) NGC 7293 (the Helix Nebula) in the 2.12 µm H2 v = 1 → 0 S(1) line. The excellent seeing (0farcs4) at the Subaru Telescope, allows the details of cometary knots to be examined. The knots are found at distances of 2farcm2-6farcm4 from the central s…
Detection of Water Ice Grains on the Surface of the Circumstellar Disk Around HD 142527
Tamura, M.; Ishii, M.; Kudo, T. +11 more
Coronagraphic imaging for the Herbig Ae star, HD 142527, was performed using the Coronagraphic Imager with Adaptive Optics (CIAO) on the 8.2 m Subaru Telescope. The images were obtained in the H2O ice filter (λ = 3.08 µm) using adaptive optics (AO), and in the L' band without AO. Combining these data with previous observational re…
Rivers, Lakes, Dunes, and Rain: Crustal Processes in Titan's Methane Cycle
Lorenz, Ralph D.; Lunine, Jonathan I.
Titan exhibits ample surface and crustal processes including lakes and seas, fluvial erosive features, possibly subsurface reservoirs of liquid, and rainfall. Together these constitute strong evidence for a multicomposition hydrological system, composed mostly of methane and ethane as well as trace amounts of other alkanes. Estimates of the volume…
VLT-FLAMES analysis of 8 giants in the bulge metal-poor globular cluster NGC 6522: oldest cluster in the Galaxy?. Analysis of 8 giants in NGC 6522
Minniti, D.; Zoccali, M.; Bica, E. +5 more
Context: NGC 6522 has been the first metal-poor globular cluster identified in the bulge by Baade. Despite its importance, very few high-resolution abundance analyses of stars in this cluster are available. The bulge metal-poor clusters may be important tracers of the early chemical enrichment of the Galaxy.
Aims: The main purpose of this stud…
NTT, Spitzer, and Chandra Spectroscopy of SDSSJ095209.56+214313.3: The Most Luminous Coronal-line Supernova Ever Observed, or a Stellar Tidal Disruption Event?
Greiner, J.; Gal-Yam, A.; Salvato, M. +9 more
The galaxy SDSSJ095209.56+214313.3 (SDSSJ0952+2143 hereafter) showed remarkable emission-line and continuum properties and strong emission-line variability first reported in 2008 (Paper I). The spectral properties and low-energy variability are the consequence of a powerful high-energy flare which was itself not observed directly. Here we report f…
Revealing X-ray obscured quasars in SWIRE sources with extreme mid-IR/optical flux ratios
Salvato, M.; Fiore, F.; Vignali, C. +4 more
Recent works have suggested that selection criteria based on mid-IR properties, i.e. extreme colors and bright flux levels, can be used to reveal a population of dust-enshrouded, extremely-luminous quasars at z ∼ 1-2. However, the X-ray spectral properties of these intriguing objects still remain largely unexplored. We have performed an X-ray stud…
Small-scale oscillations in a quiescent prominence observed by HINODE/SOT. Prominence oscillations
Ichimoto, K.; Cao, W.; Qu, Z. Q. +2 more
Context: Investigations of the behavior of small-scale threads can provide an alternative approach to studying prominence dynamics and understanding its origin and nature.
Aims: The behavior of threads are analyzed in a quiescent prominence, including drifting and both the horizontally and vertically oscillating motions. These indicate waves i…
The HST/ACS Coma Cluster Survey - V. Compact stellar systems in the Coma Cluster
Ferguson, H. C.; Huxor, A.; Smith, R. J. +14 more
The Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) Coma Cluster Treasury Survey is a deep two-passband imaging survey of the nearest very rich cluster of galaxies, covering a range of galaxy density environments. The imaging is complemented by a recent wide field redshift survey of the cluster conducted with Hectospec on the 6.5-m Mo…
Testing evidence of recent hydration state change in sulfates on Mars
Bibring, J. -P.; Mustard, J. F.; Forget, F. +6 more
The East Candor Interior Layered Deposit (ILD) has signatures of mono- and polyhydrated sulfate in alternating layers that give insight into the processes which formed these layered deposits and on the environmental conditions acting on them since then. We use orbital data to explore multiple hypotheses for how these deposits formed: (1) sulfate-b…