Physical studies of Centaurs and Trans-Neptunian Objects with the Atacama Large Millimeter Array

Once completed, the Atacama Large Millimeter Array (ALMA) will be the most powerful (sub)millimeter interferometer in terms of sensitivity, spatial resolution and imaging. This paper presents the capabilities of ALMA applied to the observation of Centaurs and Trans-Neptunian Objects, and their possible output in terms of physical properties. Realistic simulations were performed to explore the performances of the different frequency bands and array configurations, and several projects are detailed along with their feasibility, their limitations and their possible targets. Determination of diameters and albedos via the radiometric method appears to be possible on ~500 objects, while sampling of the thermal lightcurve to derive the bodies' ellipticity could be performed at least 30 bodies that display a significant optical lightcurve. On a limited number of objects, the spatial resolution allows for direct measurement of the size or even surface mapping with a resolution down to 13 milliarcseconds. Finally, ALMA could separate members of multiple systems with a separation power comparable to that of the HST. The overall performance of ALMA will make it an invaluable instrument to explore the outer solar system, complementary to space-based telescopes and spacecrafts.Comment: Accepted for publication in Icarus (23 pages, 7 figures

Expansion of Regulatory T Cells in Patients with Langerhans Cell Histiocytosis

Frederic Geissmann and colleagues find that Langerhans cell accumulation in Langerhans cell histiocytosis results from survival rather than uncontrolled proliferation, and is associated with the expansion of regulatory T cells

PAF-acether et choc anaphylactique : correlations histologiques et pharmacologiques au niveau du poumon de cobaye

CNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Etude des atmosphères et des surfaces planétaires par interférométrie millimétrique (du plateau de Bure à ALMA)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Monitoring Venus' mesospheric winds in support of Venus Express: IRAM 30-m and APEX observations

International audienceWe report on direct wind measurements in Venus' mesosphere (90-115 km), performed in support of Venus Express, and based on CO millimeter observations. Most observations, sampling the CO(2-1) and CO(1-0) lines, were acquired with the IRAM 30-m telescope, over four distinct periods: (i) Summer 2006; (ii) May-June 2007, in association with the coordinated ground-based campaign; (iii) August 2007 inferior conjunction and (iv) September 2007. In the latter period, additional measurements (CO(3-2)) were obtained with the APEX 12-m telescope. Overall, the measurements indicate a large body of temporal variability of the Venus mesospheric field, but general features emerge: (i) winds strongly increase with altitude within the mesosphere, by a factor of 2-3 over a decade in pressure; (ii) many, but not all, of our observations can be viewed as the superposition of zonal retrograde and subsolar-to-antisolar (SSAS) flows of comparable speeds, typically 30-50 m/s near 0.1 mbar ( ˜93km) and 90-120 m/s near 0.01 mbar ( ˜102km) (iii) the wind field was very stable over three consecutive observing days in May-June 2007, but much more variable on a similar time base in August 2007 (iv) at a ˜2000km resolution, the nightside wind field appears very complex, with evidence that the SSAS flow does not reach high latitudes, and possible evidence for additional meridional winds. Our Summer 2006 observations, which sample Venus' dayside, seem to suggest that a prograde zonal flow is superimposed to the SSAS circulation for this period. This surprising result, which implies a pre-midnight convergence of the wind field, requires confirmation, and fruitful comparisons may be obtained from the analysis of motions in the O 2 emission images, as observed by Venus Express

Constrains on the 12C/13C and 14N/15N Isotopic Ratio in Neptune's Atmosphere from ALMA Observations of HCN and its Isotops

International audienceWe report the detection of H13CN, HCN and upper limits of HC15N in Neptune's atmosphere with our ALMA observations. These measurements will allow us to constrain the 12C/13C and 14N/15N Isotopic ratio in Neptune's stratosphere. Our observations -performed on April 30, 2016- used the ALMA interferometer to search in Neptune's atmosphere for HCN(4-3), H13CN(4-3) and HC15N(4-3) rotational lines at 354.505, 345.339, and 344.200 GHz, respectively. These measurements were obtained using about 41 antenna of the 12m array, despite the angular resolution of 0.6'' and Neptune's angular surface diameter was 2.24'', only disk-averaged measurements allowed to detect with sufficient signal-to-noise ratio the H13CN line, while only upper limits of HC15N were obtained. We will present the analysis of these observations, which will include i) the vertical profile of HCN, ii) the isotopic ratio of 12C/13C and 14N/15N and finally discuss the origin of HCN in Neptune's stratosphere

The mm/submm spectrum of Galilean satellites

International audienc

The mm/submm spectrum of Galilean satellites

International audienc

Observing Kuiper Belt Objects With Alma: Detection And Imaging Simulations

International audienc