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Modelling the evolution of a comet subsurface: implications for 67P/Churyumov-Gerasimenko
Guilbert-Lepoutre, Aurélie; Rosenberg, Eric D.; Prialnik, Dina +1 more
Modelling the evolution of comets is a complex task aiming at providing constraints on physical processes and internal properties that are inaccessible to observations, although they could potentially bring key elements to our understanding of the origins of these primitive objects. This field has made a tremendous step forward in the post-Giotto …
Sublimation of icy aggregates in the coma of comet 67P/Churyumov-Gerasimenko detected with the OSIRIS cameras on board Rosetta
Jorda, L.; Lamy, P. L.; Lara, L. M. +58 more
Beginning in 2014 March, the OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) cameras began capturing images of the nucleus and coma (gas and dust) of comet 67P/Churyumov-Gerasimenko using both the wide angle camera (WAC) and the narrow angle camera (NAC). The many observations taken since July of 2014 have been used to study th…
Transition Region Abundance Measurements During Impulsive Heating Events
Warren, Harry P.; Doschek, George A.; Brooks, David H. +1 more
It is well established that elemental abundances vary in the solar atmosphere and that this variation is organized by first ionization potential (FIP). Previous studies have shown that in the solar corona, low-FIP elements such as Fe, Si, Mg, and Ca, are generally enriched relative to high-FIP elements such as C, N, O, Ar, and Ne. In this paper we…
DC and low-frequency double probe electric field measurements in space
Mozer, F. S.
The double probe technique for measuring DC and low-frequency electric fields in space plasmas is described with an emphasis on uncertainties in the measurements, data analysis techniques, and methods for improving the electric field measurements in future missions.
Inner disk clearing around the Herbig Ae star HD 139614: Evidence for a planet-induced gap?
Thi, W. F.; Carmona, A.; Labadie, L. +8 more
Spatially resolving the inner dust cavity (or gap) of the so-called (pre-)transitional disks is a key to understanding the connection between the processes of planetary formation and disk dispersal. The disk around the Herbig star HD 139614 is of particular interest since it presents a pretransitional nature with an au-sized gap structure that is …
Evidence for Reflected Light from the Most Eccentric Exoplanet Known
Butler, R. Paul; Mahadevan, Suvrath; Henry, Gregory W. +16 more
Planets in highly eccentric orbits form a class of objects not seen within our solar system. The most extreme case known among these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitorin…
Planck intermediate results. XLV. Radio spectra of northern extragalactic radio sources
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +184 more
Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous ground-based radio observations between 1.1 and 37 GHz.…
IC 3639—a New Bona Fide Compton-Thick AGN Unveiled by NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +19 more
We analyze high-quality NuSTAR observations of the local (z = 0.011) Seyfert 2 active galactic nucleus (AGN) IC 3639, in conjunction with archival Suzaku and Chandra data. This provides the first broadband X-ray spectral analysis of the source, spanning nearly two decades in energy (0.5-30 keV). Previous X-ray observations of the source below 10 k…
The Gaia spectrophotometric standard stars survey - III. Short-term variability monitoring
Jordi, C.; Figueras, F.; Marinoni, S. +14 more
We present the results of the short-term constancy monitoring of candidate Gaia Spectrophotometric Standard Stars (SPSS). We obtained time series of typically 1.24 h - with sampling periods from 1-3 min to a few hours, depending on the case - to monitor the constancy of our candidate SPSS down to 10 mmag, as required for the calibration of Gaia ph…
The Chandra ACIS Timing Survey Project: glimpsing a sample of faint X-ray pulsators
Sidoli, L.; Esposito, P.; Israel, G. L. +1 more
We report on the discovery of 41 new pulsating sources in the data of the Chandra Advanced CCD Imaging Spectrometer, which is sensitive to X-ray photons in the 0.3-10 keV band. The archival data of the first 15 yr of Chandra observations were retrieved and analysed by means of fast Fourier transforms, employing a peak-detection algorithm able to s…