Search Publications
The recent dynamical history of comet 67P/Churyumov-Gerasimenko
Maquet, L.
This paper presents the past evolution of the orbital elements of comet 67P/Churyumov-Gerasimenko, target of the Rosetta spacecraft. The gravitational orbit of the comet is affected by the sublimation of ice from the nucleus that triggers non-gravitational forces. The comet also experienced several close encounters with Jupiter, especially notable…
Gas and dust in the star-forming region ρ Oph A. The dust opacity exponent β and the gas-to-dust mass ratio g2d
Olofsson, G.; Liseau, R.; Justtanont, K. +6 more
Aims: We aim at determining the spatial distribution of the gas and dust in star-forming regions and address their relative abundances in quantitative terms. We also examine the dust opacity exponent β for spatial and/or temporal variations.
Methods: Using mapping observations of the very dense ρ Oph A core, we examined standard 1D and n…
A spectroscopic investigation of the O-type star population in four Cygnus OB associations. II. Determination of the fundamental parameters
Rauw, G.; De Becker, M.; Mahy, L. +2 more
Aims: Having established the binary status of nineteen O-type stars located in four Cygnus OB associations, we now determine their fundamental parameters to constrain their properties and their evolutionary status. We also investigate their surface nitrogen abundances, which we compare with other results from the literature obtained for galac…
Anatomy of the AGN in NGC 5548. III. The high-energy view with NuSTAR and INTEGRAL
Harrison, F.; Kriss, G. A.; Bianchi, S. +15 more
We describe the analysis of the seven broad-band X-ray continuum observations of the archetypal Seyfert 1 galaxy NGC 5548 that were obtained with XMM-Newton or Chandra, simultaneously with high-energy (>10 keV) observations with NuSTAR and INTEGRAL. These data were obtained as part of a multiwavelength campaign undertaken from the summer of 201…
Morphology and dynamics of the jets of comet 67P/Churyumov-Gerasimenko: Early-phase development
Jorda, L.; Lamy, P. L.; Lara, L. M. +47 more
Aims: The OSIRIS camera onboard the Rosetta spacecraft obtained close-up views of the dust coma of comet 67P. The jet structures can be used to trace their source regions and to examine the possible effect of gas-surface interaction.
Methods: We analyzed the wide-angle images obtained in the special dust observation sequences between Aug…
Dark side of comet 67P/Churyumov-Gerasimenko in Aug.-Oct. 2014. MIRO/Rosetta continuum observations of polar night in the southern regions
Jorda, L.; Sierks, H.; Keller, H. U. +20 more
The high obliquity (~50°) of comet 67P/Churyumov-Gerasimenko (67P) is responsible for a long-lasting winter polar night in the southern regions of the nucleus. We report observations made with the submillimeter and millimeter continuum channels of the Microwave Instrument onboard the Rosetta Orbiter (MIRO) of the thermal emission from these region…
Spatially resolved vertical vorticity in solar supergranulation using helioseismology and local correlation tracking
Birch, A. C.; Gizon, L.; Langfellner, J.
Flow vorticity is a fundamental property of turbulent convection in rotating systems. Solar supergranules exhibit a preferred sense of rotation, which depends on the hemisphere. This is due to the Coriolis force acting on the diverging horizontal flows. We aim to spatially resolve the vertical flow vorticity of the average supergranule at differen…
Luminosity-dependent spectral and timing properties of the accreting pulsar GX 304-1 measured with INTEGRAL
Klochkov, D.; Santangelo, A.; Staubert, R. +1 more
Context. Be/X-ray binaries show outbursts with peak luminosities up to a few times 1037 erg/s, during which they can be observed and studied in detail. Most (if not all) Be/X-ray binaries harbor accreting pulsars, whose X-ray spectra in many cases contain cyclotron resonant scattering features related to the magnetic field of the source…
Kinematics of Haro 11: The miniature Antennae
Östlin, G.; Hayes, M.; Adamo, A. +5 more
Luminous blue compact galaxies are among the most active galaxies in the local Universe in terms of their star formation rate per unit mass. They are rare at the current cosmic epoch, but were more abundant in the past and may be seen as the local analogues of higher red shift Lyman break galaxies. Studies of their kinematics is key to understandi…
The evolved circumbinary disk of AC Herculis: a radiative transfer, interferometric, and mineralogical study
Min, M.; de Vries, B. L.; Van Winckel, H. +3 more
Context. Many post-asymptotic giant branch (post-AGB) stars in binary systems have an infrared (IR) excess arising from a dusty circumbinary disk. The disk formation, current structure, and further evolution are, however, poorly understood.
Aims: We aim to constrain the structure of the circumstellar material around the post-AGB binary and RV…