Search Publications
The near-infrared companion to HD 94660 (=KQ Vel)
Hubrig, S.; Robrade, J.; Hummel, C. A. +4 more
Context. The Bp star HD 94660 is a single-lined spectroscopic binary. Some authors have suggested that the unseen companion of at least 2 M⊙ may be a compact object.
Aims: We intend to study this multiple system in detail, especially to learn more about the thus far unseen companion.
Methods: We have collected and analyzed PIO…
Contribution of polar plumes to fast solar wind
Zangrilli, L.; Giordano, S. M.
Context. Several physical properties of solar polar plumes have been identified by different published studies, however such studies are rare and sometimes in disagreement.
Aims: The purpose of the present work is to analyze a set of SOHO/UVCS data dedicated to the observation of plumes and to obtain a picture of the physical properties of pl…
VLT/SPHERE survey for exoplanets around young early-type stars, including systems with multi-belt architectures
Minniti, D.; Bayo, A.; Girard, J. +21 more
Context. Dusty debris disks around pre- and main-sequence stars are potential signposts for the existence of planetesimals and exoplanets. Giant planet formation is therefore expected to play a key role in the evolution of the disk. This is indirectly confirmed by extant submillimeter near-infrared images of young protoplanetary and cool dusty deb…
MUSE observations of comet 67P/Churyumov-Gerasimenko. A reference for future comet observations with MUSE
Snodgrass, C.; Besse, S.; Opitom, C. +2 more
Aims: Observations of comet 67P/Churyumov-Gerasimenko were performed with MUSE at large heliocentric distances post-perihelion between 3 and 7 March 2016. These observations are part of a simultaneous ground-based campaign aimed at providing broad-scale information about comet 67P to complement the ESA/Rosetta mission.
Methods: We obtain…
Light-time effect detected in fourteen eclipsing binaries
Mašek, M.; Uhlař, R.; Zasche, P. +2 more
The available minima timings of 14 selected eclipsing binaries (V1297 Cas, HD 24105, KU Aur, GU CMa, GH Mon, AZ Vel, DI Lyn, DK Her, GQ Dra, V624 Her, V1134 Her, KIC 6187893, V1928 Aql, V2486 Cyg) were collected and analyzed. Using the automatic telescopes, surveys, and satellite data, we derived more than 2500 times of eclipses, accompanied with …
Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities
Milvang-Jensen, B.; Fynbo, J. P. U.; Christensen, L. +10 more
We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Si IV, C IV, and Al III, a redshift of z = 2.41 was …
A comparative analysis of denoising algorithms for extragalactic imaging surveys
Castellano, M.; Merlin, E.; Fontana, A. +4 more
Aims: We present a comprehensive analysis of the performance of noise-reduction (denoising) algorithms to determine whether they provide advantages in source detection, mitigating noise on extragalactic survey images.
Methods: The methods we analyze here are representative of different algorithmic families: Perona-Malik filtering, bilate…
Shape model and spin state of non-principal axis rotator (5247) Krylov
Duffard, R.; Marciniak, A.; Ďurech, J. +12 more
Context. The study of non-principal axis (NPA) rotators can provide important clues to the evolution of the spin state of asteroids. However, very few studies to date have focused on NPA-rotating main belt asteroids (MBAs). One MBA known to be in an excited rotation state is asteroid (5247) Krylov.
Aims: By using disk-integrated photometric d…
ISO-ChaI 52: a weakly accreting young stellar object with a dipper light curve
Fedele, D.; Alcalá, J. M.; Manara, C. F. +6 more
We report the discovery of periodic dips in the multiband light curve of ISO-ChaI 52, a young stellar object in the Chamaeleon I dark cloud. This is one of the peculiar objects that display very low or negligible accretion in their UV continuum and spectral lines, although they present a remarkable infrared excess emission characteristic of optica…
Spatial distribution of exoplanet candidates based on Kepler and Gaia data
Budaj, J.; Maliuk, A.
Context. Surveying the spatial distribution of exoplanets in the Galaxy is important for improving our understanding of planet formation and evolution.
Aims: We aim to determine the spatial gradients of exoplanet occurrence in the Solar neighbourhood and in the vicinity of open clusters.
Methods: We combined Kepler and Gaia DR2 data for …