Search Publications
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…
Multiwavelength study of the G345.5+1.5 region
Zavagno, A.; Hervías-Caimapo, C.; Bronfman, L. +4 more
Context. The star formation process requires the dust and gas present in the Milky Way to self-assemble into dense reservoirs of neutral material where the new generation of stars will emerge. Star-forming regions are usually studied in the context of Galactic surveys, but dedicated observations are sometimes needed when the study reaches beyond t…
Spectral characterization of newly detected young substellar binaries with SINFONI
Calissendorff, Per; Janson, Markus; Köhler, Rainer +1 more
We observe 14 young low-mass substellar objects using the VLT/SINFONI integral field spectrograph with laser guide star adaptive optics to detect and characterize three candidate binary systems. All three binary candidates show strong signs of youth, with two of them likely belonging to young moving groups. Together with the adopted young-moving-g…
Revisiting the magnetization of comet 67P/Churyumov-Gerasimenko
Richter, I.; Glassmeier, K. H.; Heinisch, P. +1 more
Context. The landing of the Philae probe as part of the ESA Rosetta mission made it possible to study the magnetization of comet 67P/Churyumov-Gerasimenko (67P) by combining observations from the lander and orbiter. In this work, we revisit the magnetic properties with information gained during the progression of the mission for a comprehensive un…
Multiwavelength campaign on Mrk 509. XVI. Continued HST/COS monitoring of the far-ultraviolet spectrum
Kaastra, J. S.; Kriss, G. A.; Arav, N. +10 more
Aims: To elucidate the location, physical conditions, mass outflow rate, and kinetic luminosity of the outflow from the active nucleus of the Seyfert 1 galaxy Mrk 509, we used coordinated UV and X-ray spectral observations in 2012 to follow up our lengthier campaign conducted in 2009.
Methods: We observed Mrk 509 with the Cosmic Origins …