Search Publications
Deriving star cluster parameters with convolutional neural networks. I. Age, mass, and size
Narbutis, D.; Vansevičius, V.; Bialopetravičius, J.
Context. Convolutional neural networks (CNNs) have been proven to perform fast classification and detection on natural images and have the potential to infer astrophysical parameters on the exponentially increasing amount of sky-survey imaging data. The inference pipeline can be trained either from real human-annotated data or simulated mock obser…
The spectacular cluster chain Abell 781 as observed with LOFAR, GMRT, and XMM-Newton
Brunetti, G.; Shimwell, T. W.; Gastaldello, F. +20 more
Context. A number of merging galaxy clusters show the presence of large-scale radio emission associated with the intra-cluster medium (ICM). These synchrotron sources are generally classified as radio haloes and radio relics.
Aims: Whilst it is commonly accepted that mergers play a crucial role in the formation of radio haloes and relics, not…
Scattering, absorption, and thermal emission by large cometary dust particles: Synoptic numerical solution
Agarwal, Jessica; Markkanen, Johannes
Context. Remote light scattering and thermal infrared observations provide clues about the physical properties of cometary and interplanetary dust particles. Identifying these properties will lead to a better understanding of the formation and evolution of the Solar System.
Aims: We present a numerical solution for the radiative and conductiv…
Venus Express radio occultation observed by PRIDE
Wang, W.; Zheng, W.; Bocanegra-Bahamón, T. M. +18 more
Context. Radio occultation is a technique used to study planetary atmospheres by means of the refraction and absorption of a spacecraft carrier signal through the atmosphere of the celestial body of interest, as detected from a ground station on Earth. This technique is usually employed by the deep space tracking and communication facilities (e.g.…
Gaia DR2 orbital properties for field stars with globular cluster-like CN band strengths
Posti, L.; Savino, A.
Context. Large spectroscopic surveys of the Milky Way have revealed that a small population of stars in the halo have light element abundances comparable to those found in globular clusters. The favoured explanation for the peculiar abundances of these stars is that they originated inside a globular cluster and were subsequently lost.
Aims: U…
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell
Olofsson, H.; Mecina, M.; Kerschbaum, F. +4 more
Aims: The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like structure in thermal dust emission. We investigate the molecular counterpart in high resolution, aiming t…
First detection of oscillations in the Halo giant HD 122563: Validation of seismic scaling relations and new parameters
Andersen, M. F.; Grundahl, F.; Pallé, P. L. +8 more
Aims: The nearby metal-poor giant HD 122563 is an important astrophysical laboratory in which to test stellar atmospheric and interior physics. It is also a benchmark star for which to calibrate methods to apply to large scale surveys. Recently it has been remeasured using various methodologies given the new high precision instruments at our …
The Close AGN Reference Survey (CARS). Discovery of a global [C II] 158 µm line excess in AGN HE 1353-1917
Gaspari, M.; Groves, B.; Combes, F. +15 more
The [C II]λ158 µm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [C II] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [C II] excess with respect…
Discovery of a second pulsating intermediate helium-enriched sdOB star
Latour, M.; Green, E. M.; Fontaine, G.
We present the discovery of long-period, low-amplitude, g-mode pulsations in the intermediate He-rich hot subdwarf (sdOB) star Feige 46. So far, only one other He-enriched sdOB star (LS IV-14 ° 116) was known to exhibit such pulsations. From our ground-based light curves of Feige 46, we extracted five independent periodicities ranging from 2294 s …
Masses of the Hyades white dwarfs. A gravitational redshift measurement
Pasquini, L.; Pala, A. F.; Ludwig, H. -G. +3 more
Context. It is possible to accurately measure the masses of the white dwarfs (WDs) in the Hyades cluster using gravitational redshift, because the radial velocity of the stars can be obtained independently of spectroscopy from astrometry and the cluster has a low velocity dispersion.
Aims: We aim to obtain an accurate measurement of the Hyade…