Search Publications
Measurement of dust optical depth using the solar irradiance sensor (SIS) onboard the ExoMars 2016 EDM
Rannou, P.; Toledo, D.; Gómez, L. +5 more
The solar irradiance sensor (SIS) was included in the DREAMS package onboard the ExoMars 2016 Entry Descent and Landing Demonstrator Module, and has been selected in the METEO meteorological station onboard the ExoMars 2020 Lander. This instrument is designed to measure at different time intervals the scattered flux or the sum of direct flux and s…
Discovery of an H I-rich Gas Reservoir in the Outskirts of SZ-effect-selected Clusters
Nagai, Daisuke; Schaye, Joop; Muzahid, Sowgat +2 more
We report on the detection of three strong H I absorbers originating in the outskirts (I.e., impact parameter, {ρ }{cl} ≈ (1.6-4.7)r 500) of three massive ({M}500∼ 3× {10}14 M ⊙) clusters of galaxies at redshift {z}{cl}≈ 0.46, in the Hubble Space Telescope Cosmic Origins Spectrograp…
Observations of Lyα and O VI: Signatures of Cooling and Star Formation in a Massive Central Cluster Galaxy
Donahue, Megan; Voit, G. Mark; Connor, Thomas +1 more
We report new Hubble Space Telescope COS and Space Telescope Imaging Spectrograph spectroscopy of a star-forming region (∼ 100 {M}⊙ yr-1) in the center of the X-ray cluster RX J1532.9+3021 (z = 0.362), to follow-up the CLASH team discovery of luminous UV filaments and knots in the central massive galaxy. We detect broad (∼50…
Interchange Reconnection Associated with a Confined Filament Eruption: Implications for the Source of Transient Cold-dense Plasma in Solar Winds
Li, Gang; Chen, Yao; Zheng, Ruisheng +2 more
The cold-dense plasma is occasionally detected in the solar wind with in situ data, but the source of the cold-dense plasma remains illusive. Interchange reconnections (IRs) between closed fields and nearby open fields are known to contribute to the formation of solar winds. We present a confined filament eruption associated with a puff-like coron…
Bidirectional reflectance of laboratory cometary analogues to interpret the spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko
Thomas, Nicolas; Fornasier, Sonia; Pommerol, Antoine +5 more
In this work we provide measurements of the bidirectional reflectance in the VIS-NIR spectral range for a selection of laboratory samples to deduce parameters such as their visible spectrum, phase curve, hemispheric albedo and phase reddening. The aim is to simulate the reflectance of the comet nucleus in order to aid the interpretation of data fr…
Cometary coma dust size distribution from in situ IR spectra
Fulle, M.; Mottola, S.; D'Aversa, E. +16 more
Dust is the most abundant component in cometary comae. Here, we investigate the dust size distribution in 67P/Churyumov-Gerasimenko (67P/CG) using data from the Rosetta spacecraft that was in close proximity to the comet from 2014 August to 2016 September. The Visual, Infrared and Thermal Imaging Spectrometer (VIRTIS-M), spectral range of 0.25-5 &…
Monopole and dipole estimation for multi-frequency sky maps by linear regression
Banday, A. J.; Dickinson, C.; Eriksen, H. K. +9 more
We describe a simple but efficient method for deriving a consistent set of monopole and dipole corrections for multi-frequency sky map data sets, allowing robust parametric component separation with the same data set. The computational core of this method is linear regression between pairs of frequency maps, often called T-T plots. Individual cont…
ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm
Solanki, Sami K.; Shimojo, Masumi; White, Stephen M. +2 more
We report the discovery of a brightness enhancement in the center of a large sunspot umbra at a wavelength of 3 mm using the Atacama Large Millimeter/sub-millimeter Array (ALMA). Sunspots are among the most prominent features on the solar surface, but many of their aspects are surprisingly poorly understood. We analyzed a λ = 3 mm (100 GHz) mosaic…
Expanding and Contracting Coronal Loops as Evidence of Vortex Flows Induced by Solar Eruptions
Aulanier, G.; Schmieder, B.; Démoulin, P. +2 more
Eruptive solar flares were predicted to generate large-scale vortex flows at both sides of the erupting magnetic flux rope. This process is analogous to a well-known hydrodynamic process creating vortex rings. The vortices lead to advection of closed coronal loops located at the peripheries of the flaring active region. Outward flows are expected …
Chemical composition of the stellar cluster Gaia1: no surprise behind Sirius
Bonifacio, P.; Saviane, I.; Monaco, L. +1 more
We observed six He-clump stars of the intermediate-age stellar cluster Gaia1 with the MIKE/Magellan spectrograph. A possible extra-galactic origin of this cluster, recently discovered thanks to the first data release of the ESA Gaia mission, has been suggested, based on its orbital parameters. Abundances for Fe, α, proton- and neutron-capture elem…