Search Publications
High-resolution X-ray spectroscopy: The coming-of-age
Kaastra, J. S.
Since the launch of Chandra and XMM-Newton, high-resolution X-ray spectra of cosmic sources of all kinds have become available. These spectra have resulted in major scientific breakthroughs. However, due to the techniques used, in general high-quality spectra can only be obtained for the brightest few sources of each class. Moreover, except for th…
Suprathermal helium in corotating interaction regions: combined observations from SOHO/CELIAS/STOF and ACE/SWICS
Bochsler, P.; Klecker, B.; Berger, L. +4 more
Context. Energetic particle enhancements that are associated with corotating interaction regions (CIRs) are typically believed to arise from the sunward propagation of particles that are accelerated by CIR-driven shocks beyond 1 AU. It is expected that these sunward-travelling particles will lose energy and scatter, resulting in a turnover of the …
Gaia eclipsing binary and multiple systems. A study of detectability and classification of eclipsing binaries with Gaia
Rimoldini, L.; Holl, B.; Mowlavi, N. +5 more
Context. In the new era of large-scale astronomical surveys, automated methods of analysis and classification of bulk data are a fundamental tool for fast and efficient production of deliverables. This becomes ever more important as we enter the Gaia era.
Aims: We investigate the potential detectability of eclipsing binaries with Gaia using a…
The Formation of IRIS Diagnostics. IX. The Formation of the C I 135.58 NM Line in the Solar Atmosphere
Carlsson, Mats; Leenaarts, Jorrit; Lin, Hsiao-Hsuan
The C I 135.58 nm line is located in the wavelength range of NASA’s Interface Region Imaging Spectrograph (IRIS) small explorer mission. We study the formation and diagnostic potential of this line by means of non local-thermodynamic-equilibrium modeling, employing both 1D and 3D radiation-magnetohydrodynamic models. The C I/C II ionization balanc…
DREAMS-SIS: The Solar Irradiance Sensor on-board the ExoMars 2016 lander
Toledo, D.; Gómez, L.; Apéstigue, V. +10 more
The Solar Irradiance Sensor (SIS) was part of the DREAMS (Dust characterization, Risk assessment, and Environment Analyzer on the Martian Surface) payload package on board the ExoMars 2016 Entry and Descent Module (EDM), "Schiaparelli". DREAMS was a meteorological station aimed at the measurement of several atmospheric parameters, as well as the p…
General relativistic observable for gravitational astrometry in the context of the Gaia mission and beyond
Geralico, Andrea; Lattanzi, Mario G.; Crosta, Mariateresa +1 more
With the launch of the Gaia mission, general relativity (GR) is now at the very core of astrometry. Given the high level of accuracy of the measurements, the development of a suitable relativistic model for carrying out the correct data processing and analysis has become a critical necessity; its primary goal is to have a consistent set of stellar…
The anatomy of a wrinkle ridge revealed in the wall of Melas Chasma, Mars
Andrews-Hanna, Jeffrey C.; Cole, Hank M.
Wrinkle ridges are among the most common tectonic structures on the terrestrial planets and provide important records of the history of planetary strain and geodynamics. The observed broad arches and superposed narrow wrinkles are thought to be the surface manifestation of blind thrust faults, which terminate in near-surface volcanic sequences and…
Energy-angle dispersion of accelerated heavy ions at 67P/Churyumov-Gerasimenko: implication in the mass-loading mechanism
Yamauchi, M.; Behar, E.; Nilsson, H. +4 more
The Rosetta spacecraft studied the comet 67P/Churyumov-Gerasimenko for nearly two years. The Ion Composition Analyzer instrument on board Rosetta observed the positive ion distributions in the environment of the comet during the mission. A portion of the comet's neutral coma is expected to get ionized, depending on the comet's activity and positio…
Primordial power spectrum features in phenomenological descriptions of inflation
Mena, Olga; Boubekeur, Lotfi; Gariazzo, Stefano +1 more
We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of e-folds and four phenomenological parameters. This approach captures a number of possible inflationary models, including those with non-canonical kinetic terms or scale-dependent non-gaussiani…
Signatures of the Martian rotation parameters in the Doppler and range observables
Yseboodt, Marie; Dehant, Véronique; Péters, Marie-Julie
The position of a Martian lander is affected by different aspects of Mars' rotational motions: the nutations, the precession, the length-of-day variations and the polar motion. These various motions have a different signature in a Doppler observable between the Earth and a lander on Mars' surface. Knowing the correlations between these signatures …