Search Publications
Polarization of the changing-look quasar J1011+5442
Ramos Almeida, C.; Sluse, D.; Hutsemékers, D. +2 more
If the disappearance of the broad emission lines observed in changing-look quasars were caused by the obscuration of the quasar core through moving dust clouds in the torus, high linear polarization typical of type 2 quasars would be expected. We measured the polarization of the changing-look quasar J1011+5442 in which the broad emission lines hav…
Is near-surface ice the driver of dust activity on 67P/Churyumov-Gerasimenko
Keller, H. U.; Hartogh, P.; Rezac, L. +1 more
Context. Mainly for historical reasons, nearly all of the current thermophysical models of dust activity rely on the poorly justified assumption of cohesionless dust lifted by a gas drag force against the weak nucleus gravity. The interpretation of Rosetta data and our understanding of comet activity is particularly sensitive to this assumption. <…
Origin of the wide-orbit circumbinary giant planet HD 106906. A dynamical scenario and its impact on the disk
Ducourant, C.; Teixeira, R.; Lagrange, A. -M. +4 more
Context. A giant planet has been recently resolved at a projected distance of 730 au from the tight pair of young (~13 Myr) intermediate-mass stars HD 106906AB in the Lower Centaurus Crux (LCC) group. The stars are surrounded by a debris disk which displays a ring-like morphology and strong asymmetries at multiple scales.
Aims: We aim to stud…
A neural network gravitational arc finder based on the Mediatrix filamentation method
Bom, C. R.; Makler, M.; Brandt, C. H. +1 more
Context. Automated arc detection methods are needed to scan the ongoing and next-generation wide-field imaging surveys, which are expected to contain thousands of strong lensing systems. Arc finders are also required for a quantitative comparison between predictions and observations of arc abundance. Several algorithms have been proposed to this e…
Disproving the validated planets K2-78b, K2-82b, and K2-92b. The importance of independently confirming planetary candidates
Zucker, S.; Alonso, R.; Deleuil, M. +13 more
Context. Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres.
Aims: While selecting super-Earths suitable for further characterisation from the ground from a list of confirmed and validated exoplanets detected by K2, we found some suspicious cases that led to us…
Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
Umana, G.; Moore, T. J. T.; Palmeirim, P. +35 more
We present a comprehensive statistical analysis of star-forming objects located in the vicinities of 1360 bubble structures throughout the Galactic plane and their local environments. The compilation of ~70 000 star-forming sources, found in the proximity of the ionized (HII) regions and detected in both Hi-GAL and GLIMPSE surveys, provided a broa…
A concordant scenario to explain FU Orionis from deep centimeter and millimeter interferometric observations
Henning, Thomas; Dong, Ruobing; Tamura, Motohide +13 more
Aims: The aim of this work is to constrain properties of the disk around the archetype FU Orionis object, FU Ori, with as good as 25 au resolution.
Methods: We resolved FU Ori at 29-37 GHz using the Karl G. Jansky Very Large Array (JVLA) in the A-array configuration, which provided the highest possible angular resolution to date at this …
An observational study of dust nucleation in Mira (o Ceti). II. Titanium oxides are negligible for nucleation at high temperatures
Menten, K. M.; Müller, H. S. P.; Patel, N. A. +7 more
Context. The formation of silicate dust in oxygen-rich envelopes of evolved stars is thought to be initiated by the formation of seed particles that can withstand the high temperatures close to the stellar photosphere and act as condensation cores farther away from the star. TiO and TiO2 are among the candidate species considered as fir…
AGN spectral states from simultaneous UV and X-ray observations by XMM-Newton
Merloni, A.; Guainazzi, M.; Svoboda, J.
Context. It is generally believed that the supermassive black holes in active galactic nuclei (AGN) and stellar-mass black holes in X-ray binaries (XRBs) work in a similar way.
Aims: While XRBs evolve rapidly and several sources have undergone a few complete cycles from quiescence to an outburst and back, most AGN remain in the same state ove…
The ASTRODEEP Frontier Fields catalogues. III. Multiwavelength photometry and rest-frame properties of MACS-J0717 and MACS-J1149
Elbaz, D.; McLure, R. J.; Dunlop, J. S. +14 more
Aims: We present the multiwavelength photometry of two Frontier Fields massive galaxy clusters, MACS-J0717 and MACS-J1149, and their parallel fields, ranging from Hubble Space Telescope (HST) to ground-based K and Spitzer IRAC bands, and the public release of photometric redshifts and rest-frame properties of galaxies found in cluster and par…