Search Publications
Spectral imaging of the thermal Sunyaev-Zel'dovich effect in X-COP galaxy clusters: method and validation
Baldi, A. S.; Bourdin, H.; Mazzotta, P. +4 more
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe the thermal pressure of the intra-cluster gas, especially in the outermost regions where X-ray observations suffer from photon statistics. For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm fo…
Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +37 more
Aims: We provide a detailed quantitative analysis of isolated boulder fields situated in three different regions of comet 67P/Churyumov-Gerasimenko: Imhotep, Hapi, and Hatmehit. This is done to supply a useful method for analyzing the morphology of the boulders and to characterize the regions themselves.
Methods: We used OSIRIS Narrow An…
Quest for the tertiary component in Cyg OB2 #5
Nazé, Yaël; Rauw, Gregor; Campos, Fran
Aims: The Cyg OB2 #5 system is thought to consist of a short-period (6.6 d) eclipsing massive binary orbited by an OB-star with a period of 6.7 yr; these stars in turn are orbited by a distant early B-star with a period of thousands of years. However, while the inner binary has been studied many times, information is missing on the other star…
Spitzer Space Telescope observations of bilobate comet 8P/Tuttle
Jorda, L.; Lamy, P. L.; Groussin, O. +4 more
Context. Comet 8P/Tuttle is a nearly isotropic comet whose physical properties are poorly known and might be different from those of ecliptic comets owing to their different origin. Two independent observations have shown that 8P/Tuttle has a bilobate nucleus.
Aims: Our goal is to determine the physical properties of the nucleus (size, shape,…
UV slope of z ∼ 3 bright (L > L*) Lyman-break galaxies in the COSMOS field
Castellano, M.; Pentericci, L.; Santini, P. +7 more
Context. The analysis of the UV slope β of Lyman-break galaxies (LBG) at different luminosities and redshifts is fundamental for understanding their physical properties, and in particular, their dust extinction.
Aims: We analyse a unique sample of 517 bright (L > L*) LBGs at redshift z ∼ 3 in order to characterise the distributi…
QSO2 outflow characterization using data obtained with OSIRIS at the Gran Telescopio Canarias
Cabrera-Lavers, Antonio; Bellocchi, Enrica; Emonts, Bjorn +1 more
Context. Ionized outflows are ubiquitous in non-radio-loud obscured quasars (QSO2s) at different redshifts. However, the actual size of the outflows and their efficiency for gas ejection and star formation truncation are controversial. Large-scale (exceeding several kiloparsec) extended radio structures might be necessary to identify (even to trig…
Shape evolution of cometary nuclei via anisotropic mass loss
Vavilov, D. E.; Eggl, S.; Medvedev, Yu. D. +1 more
Context. Breathtaking imagery recorded during the European Space Agency Rosetta mission confirmed the bilobate nature of the nucleus of comet 67P/Churyumov-Gerasimenko. The peculiar appearance of the nucleus is not unique among comets. The majority of cometary cores imaged at high resolution exhibit a similar build. Various theories have been brou…
Prospects for detecting the astrometric signature of Barnard's Star b
Zucker, S.; Reiners, A.; Ribas, I. +2 more
A low-amplitude periodic signal in the radial velocity (RV) time series of Barnard's Star was recently attributed to a planetary companion with a minimum mass of 3.2 M⊕ at an orbital period of 233 days. The relatively long orbital period and the proximity of Barnard's Star to the Sun raises the question whether the true mass of the plan…
X-ray emission in the enigmatic CVSO 30 system
Schmitt, J. H. M. M.; Schmidt, T. O. B.; Czesla, S. +3 more
CVSO 30 is a young, active, weak-line T Tauri star; it possibly hosts the only known planetary system with both a transiting hot-Jupiter and a cold-Jupiter candidate (CVSO 30 b and CVSO 30 c). We analyzed archival ROSAT, Chandra, and XMM-Newton data to study the coronal emission in the system. According to our modeling, CVSO 30 shows a quiescent X…
Spectral analysis of the barium central star of the planetary nebula Hen 2-39
Boffin, H. M. J.; Jones, D.; Löbling, L.
Context. Barium stars are peculiar red giants characterized by an overabundance of the elements synthesized in the slow neutron-capture nucleosynthesis (s-process elements) along with an enrichment in carbon. These stars are discovered in binaries with white dwarf companions. The more recently formed of these stars are still surrounded by a planet…