Search Publications
Geomorphology and spectrophotometry of Philae's landing site on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Bertaux, J. -L.; Lamy, P. +52 more
Context. On 12 November 2014 the European mission Rosetta succeeded in delivering a lander, named Philae, on the surface of one of the smallest, low-gravity and most primitive bodies of the solar system, the comet 67P/Churyumov-Gerasimenko (67P).
Aims: The aim of this paper is to provide a comprehensive geomorphological and spectrophotometric…
Non-conservative evolution in Algols: where is the matter?
Baes, M.; Jorissen, A.; Siess, L. +3 more
Context. There is indirect evidence of non-conservative evolutions in Algols. However, the systemic mass-loss rate is poorly constrained by observations and generally set as a free parameter in binary-star evolution simulations. Moreover, systemic mass loss may lead to observational signatures that still need to be found.
Aims: Within the "ho…
Stellar cycles from photometric data: CoRoT stars
Catelan, M.; Ferreira Lopes, C. E.; De Medeiros, J. R. +3 more
Context. Until a few years ago, the amplitude variation in the photometric data had been explored to a limited extent mainly because of time resolution and photometric sensitivity limitations. This investigation is now possible thanks to the Kepler and CoRoT databases which provide a unique set of data for studying the nature of stellar variabilit…
ALMA observations of α Centauri. First detection of main-sequence stars at 3 mm wavelength
Olofsson, G.; Eiroa, C.; Marshall, J. P. +19 more
Context. The precise mechanisms that provide the non-radiative energy for heating the chromosphere and the corona of the Sun and those of other stars constitute an active field of research. By studying stellar chromospheres one aims at identifying the relevant physical processes. Defining the permittable extent of the parameter space can also serv…
Close encounters of the stellar kind
Bailer-Jones, C. A. L.
Stars which pass close to the Sun can perturb the Oort cloud, injecting comets into the inner solar system where they may collide with the Earth. Using van Leeuwen's re-reduction of the Hipparcos data complemented by the original Hipparcos and Tycho-2 catalogues, along with recent radial velocity surveys, I integrate the orbits of over 50 000 star…
Depth-dependent global properties of a sunspot observed by Hinode using the Solar Optical Telescope/Spectropolarimeter
Lagg, Andreas; Solanki, Sami K.; Tiwari, Sanjiv K. +1 more
Context. For the past two decades, the three-dimensional structure of sunspots has been studied extensively. A recent improvement in the Stokes inversion technique prompts us to revisit the depth-dependent properties of sunspots.
Aims: In the present work, we aim to investigate the global depth-dependent thermal, velocity, and magnetic proper…
Linking radio and gamma-ray emission in Ap Librae
Hervet, O.; Boisson, C.; Sol, H.
Ap Lib is one of the rare low-synchrotron-peaked blazars detected so far at TeV energies. This type of source is not properly modelled by standard one-zone leptonic synchrotron self-Compton (SSC) emission scenarios. The aim of this paper is to study the relevance of additional components that should naturally occur in an SSC scenario for a better …
Physical properties of solar polar jets. A statistical study with Hinode XRT data
Bemporad, A.; Sterling, A. C.; Paraschiv, A. R.
Aims: The target of this work is to investigate the physical nature of polar jets in the solar corona and their possible contribution to coronal heating and solar wind flow based on the analysis of X-ray images acquired by the Hinode XRT telescope. We estimate the different forms of energy associated with many of these small-scale eruptions, …
Parameter estimation of superdiffusive motion of energetic particles upstream of heliospheric shocks
Zimbardo, Gaetano; Perri, Silvia; Fichtner, Horst +1 more
Context. In-situ spacecraft observations recently suggested that the transport of energetic particles accelerated at heliospheric shocks can be anomalous, i.e. the mean square displacement can grow non-linearly in time. In particular, a new analysis technique has permitted the study of particle transport properties from energetic particle time pro…
Multitechnique testing of the viscous decretion disk model. I. The stable and tenuous disk of the late-type Be star β CMi
Carciofi, A. C.; Rivinius, Th.; Štefl, S. +10 more
Context. The viscous decretion disk (VDD) model is able to explain most of the currently observable properties of the circumstellar disks of Be stars. However, more stringent tests, focusing on reproducing multitechnique observations of individual targets via physical modeling, are needed to study the predictions of the VDD model under specific ci…