Search Publications
Searching for the nature of stars with debris disks and planets
Cifuentes, C.; Cruz, P.; Roca-Fàbrega, S. +3 more
The nature of the few known solar-mass stars simultaneously containing debris disks and planets remains an open question. A number of works have shown that this property appears to be independent of planetary masses as well as of stellar age, but possible correlations with stellar kinematics and metallicity have not been investigated. In this pape…
Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +76 more
Aims: DE Boo is a unique system, with an edge-on view through the debris disk around the star. The disk, which is analogous to the Kuiper belt in the Solar System, was reported to extend from 74 to 84 AU from the central star. The high photometric precision of the Characterising Exoplanet Satellite (CHEOPS) provided an exceptional opportunity…
CCD astrometric measurements for the dwarf planet Haumea by ground-based telescopes
Vienne, A.; Peng, Q. Y.; Zheng, Z. J. +3 more
Aims: The purpose of this work is to investigate an astrometric method to accurately measure the precise position of the center of mass of the dwarf planet Haumea and its satellites, based on the unresolved images taken by ground-based telescopes.
Methods: A total of 29 nights of CCD observations are reported of the dwarf planet Haumea, …
Polarisation of molecular lines in the circumstellar envelope of the post-asymptotic giant branch star OH 17.7-2.0
Tafoya, D.; Vlemmings, W. H. T.
Context. The role of magnetic field in shaping planetary nebulae (PNe), either directly or indirectly after being enhanced by binary interaction, has long been a topic of debate. Large-scale magnetic fields around pre-PNe have been inferred from polarisation observations of masers. However, because masers probe very specific regions, it is still u…
Orbit determination for the binary Cepheid V1344 Aql
Szabados, L.; Cseh, B.; Kovács, J. +4 more
Context. Binary Cepheids play an important role in the investigation of the calibration of the classical Cepheid period-luminosity relationship. Therefore, a thorough study of individual Cepheids belonging to binary systems is necessary.
Aims: Our aim is to determine the orbit of the binary system V1344 Aql using newly observed and earlier pu…
The M 101 galaxy group as a node in a nearby cosmic filament
Karachentsev, Igor D.; Karachentseva, Valentina E.; Kaisina, Elena I. +1 more
We performed a search for faint low-surface-brightness dwarf galaxies around the major spiral galaxy M 101 and in the large rectangular area within SGL = [30-80]° and SGB = [10-37]° spanning a chain of galaxies: M 63, M 51, M 101, and NGC 6503. We based our search on data from DESI Legacy Imaging Surveys. We discovered six new probable dwarf membe…
A 600 kpc complex radio source at the center of Abell 3718 discovered by the EMU and POSSUM surveys
Filipović, M. D.; Lovisari, L.; Boschin, W. +10 more
Context. Multifrequency studies of galaxy clusters are crucial for inferring their dynamical states and physics. Moreover, these studies allow us to investigate cluster-embedded sources, whose evolution is affected by the physical and dynamical condition of the cluster itself. So far, these kinds of studies have been preferentially conducted on cl…
A re-analysis of equilibrium chemistry in five hot Jupiters
Drossart, P.; Panek, E.; Beaulieu, J. -P. +4 more
Aims: Studies of chemistry and chemical composition are fundamental to exploring the formation histories of planets and planetary systems. We propose having another look at five targets to better determine their composition and the chemical mechanisms taking place in their atmospheres. We present a re-analysis of five hot Jupiters, combining …
Multi-epoch variability of AT 2000ch (SN 2000ch) in NGC 3432. A radio continuum and optical study
Bomans, Dominik J.; Weis, Kerstin; Dettmar, Ralf-Jürgen +5 more
Context. AT 2000ch is a highly variable massive star and supernova imposter in NGC 3432 first detected in 2000. It is similar and often compared to SN 2009ip, and it is therefore expected to undergo a core-collapse supernova (SN) - a SN imposter of similar brightness - in the near future.
Aims: We characterize the long-term variability of AT …
Simplifying asteroseismic analysis of solar-like oscillators. An application of principal component analysis for dimensionality reduction
Chaplin, W. J.; Davies, G. R.; Nielsen, M. B. +5 more
Context. The asteroseismic analysis of stellar power density spectra is often computationally expensive. The models used in the analysis may require several dozen parameters to accurately describe features in the spectra caused by the oscillation modes and surface granulation. Many of these parameters are often highly correlated, making the parame…