Search Publications
ULISSE: A tool for one-shot sky exploration and its application for detection of active galactic nuclei
Paolillo, Maurizio; Brescia, Massimo; Cavuoti, Stefano +5 more
Context. Modern sky surveys are producing ever larger amounts of observational data, which makes the application of classical approaches for the classification and analysis of objects challenging and time consuming. However, this issue may be significantly mitigated by the application of automatic machine and deep learning methods.
Aims: We p…
CORALIE radial-velocity search for companions around evolved stars (CASCADES). III. A new Jupiter host-star: in-depth analysis of HD 29399 using TESS data
Buldgen, G.; Eggenberger, P.; Ségransan, D. +11 more
Context. Increasing the number of detected exoplanets is far from anecdotal, especially for long-period planets that require a long duration of observation. More detections imply a better understanding of the statistical properties of exoplanet populations, and detailed modelling of their host stars also enables thorough discussions of star-planet…
Post-Newtonian gravity and Gaia-like astrometry. Effect of PPN γ uncertainty on parallaxes
Bucciarelli, Beatrice; Lattanzi, Mario G.; Crosta, Mariateresa +3 more
Context. Relativistic models of light propagation adopted for high-precision astrometry are based on the parametrised post-Newtonian formalism, which provides a framework for examining the effects of a hypothetical violation of general relativity on astrometric data. Astrometric observations are strongly affected by the post-Newtonian (PPN) parame…
Three-dimensional analyses of an aspherical coronal mass ejection and its driven shock
Feng, Li; Lu, Lei; Gan, Weiqun +4 more
Context. Observations reveal that shocks can be driven by fast coronal mass ejections (CMEs) and play essential roles in particle accelerations. A critical ratio, δ, derived from a shock standoff distance normalized by the radius of curvature (ROC) of a CME, allows us to estimate shock and ambient coronal parameters. However, true ROCs of CMEs are…
A probabilistic method for detecting solar-like oscillations using meaningful prior information. Application to TESS 2-minute photometry
Chaplin, W. J.; Davies, G. R.; Nielsen, M. B. +2 more
Context. Current and future space-based observatories such as the Transiting Exoplanet Survey Satellite (TESS) and PLATO are set to provide an enormous amount of new data on oscillating stars, and in particular stars that oscillate similar to the Sun. Solar-like oscillators constitute the majority of known oscillating stars and so automated analys…
The mid-infrared aliphatic bands associated with complex hydrocarbons
Peeters, E.; Sloan, G. C.; Stock, D. J. +2 more
Context. The mid-infrared emission features commonly attributed to polycyclic aromatic hydrocarbons (PAHs) vary in profile and peak position. These profile variations form the basis of their classification: Classes A, B, C reflect profiles with increasing central wavelength while Class D has similar central wavelength as Class B but a similar broa…
Chemical composition of the young massive cluster NGC 1569-B
Larsen, S. S.; Beasley, M. A.; Brodie, J. +1 more
Context. The chemical composition of young massive clusters (YMCs) provides stellar population information on their host galaxy. As potential precursors of globular clusters (GCs), their properties can help us understand the origins of GCs and their evolution.
Aims: We present a detailed chemical abundance analysis of the YMC NGC 1569-B. The …
eROSITA X-ray scan of the η Chamaeleontis cluster. Member study and search for dispersed low-mass stars
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
Context. The nearby young open cluster η Chamaeleontis has been observed by eROSITA/SRG during its CalPV phase for 150 ks. The extended ROentgen Survey with an Imaging Telescope Array (eROSITA) data were taken in the field-scan mode, an observing mode of Spectrum-Roentgen-Gamma (SRG) that follows a rectangular grid-like pattern, here covering a 5 …
Unveiling wide-orbit companions to K-type stars in Sco-Cen with Gaia EDR3
Henning, Thomas; Brown, Anthony G. A.; Ginski, Christian +12 more
Context. The detection of low-mass companions to stellar hosts is important for testing the formation scenarios of these systems. Companions at wide separations are particularly intriguing objects as they are easily accessible for variability studies of the rotational dynamics and cloud coverage of these brown dwarfs or planetary-mass objects.
Infrared-radio relation in the local Universe
De Zotti, G.; Tisanić, K.; Amiri, A. +3 more
Context. The Square Kilometer Array (SKA) is expected to detect high-redshift galaxies with star formation rates (SFRs) up to two orders of magnitude lower than Herschel surveys and will thus boost the ability of radio astronomy to study extragalactic sources. The tight infrared-radio correlation offers the possibility of using radio emission as a…