Search Publications
X-ray flares of the young planet host Ds Tucanae A
Micela, G.; Reale, F.; Benatti, S. +5 more
The discovery of planets around young stars has spurred novel studies of the early phases of planetary formation and evolution. Stars are strong emitters at X-ray and UV wavelengths in their first billion of years and this strongly affects the evaporation, thermodynamics, and chemistry in the atmospheres of the young planets orbiting around them. …
Shock-accelerated electrons during the fast expansion of a coronal mass ejection
Vainio, R.; Kilpua, E. K. J.; Kumari, A. +2 more
Context. Some of of the most prominent sources for energetic particles in our Solar System are huge eruptions of magnetised plasma from the Sun called coronal mass ejections (CMEs), which usually drive shocks that accelerate charged particles up to relativistic energies. In particular, energetic electron beams can generate radio bursts through the…
The properties of the X-ray corona in the distant (z = 3.91) quasar APM 08279+5255
Cappi, M.; Vignali, C.; Gilli, R. +7 more
We present new joint XMM-Newton and NuSTAR observations of APM 08279+5255, a gravitationally-lensed, broad-absorption line quasar (z = 3.91). After showing a fairly stable flux (f2 − 10 ≃ 4 − 5.5 × 10−13 erg s−1) from 2000 to 2008, APM 08279+5255 was found in a fainter state in the latest X-ray exposures (f2 −…
Identification of three cataclysmic variables detected by the ART-XC and eROSITA telescopes on board the SRG during the all-sky X-ray survey
Sunyaev, R.; Sazonov, S.; Burenin, R. +6 more
We report the discovery of three cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were selected for their brightness in the 4-12 keV band in the data of the Mikhail Pavlinsky ART-XC telescope. They are also detected by the eROSITA telescope, which provides accurate localiza…
Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT
De Cat, P.; Frasca, A.; Wang, J. X. +7 more
Aims: In this work we present the results of our analysis of 16 300 medium-resolution LAMOST spectra of late-type stars in the Kepler field with the aim of determining the stellar parameters, activity level, lithium atmospheric content, and binarity.
Methods: We have used a version of the code ROTFIT specifically developed for the LAMOST…
On the dynamical evolution of Cepheids in star clusters
Anderson, Richard I.; Kroupa, Pavel; Dinnbier, František
We investigated the occurrence of classical (type-I) Cepheid variable stars (henceforth Cepheids) in dynamically evolving star clusters from birth to an age of approximately 300 Myr. The clusters are modelled by the Aarseth code NBODY6, and they feature a realistic stellar initial mass function and initial binary star population, single star and b…
Automatic detection of small-scale EUV brightenings observed by the Solar Orbiter/EUI
Barczynski, K.; Chitta, L. P.; Zhukov, A. N. +23 more
Context. Accurate detections of frequent small-scale extreme ultraviolet (EUV) brightenings are essential to the investigation of the physical processes heating the corona.
Aims: We detected small-scale brightenings, termed campfires, using their morphological and intensity structures as observed in coronal EUV imaging observations for statis…
The APEX Large CO Heterodyne Orion Legacy Survey (ALCOHOLS). I. Survey overview
Smith, M. D.; Eislöffel, J.; Williams, J. P. +29 more
Context. The Orion molecular cloud complex harbours the nearest Giant Molecular Clouds (GMCs) and the nearest site of high-mass star formation. Its young star and protostar populations are thoroughly characterized. The region is therefore a prime target for the study of star formation.
Aims: Here, we verify the performance of the SuperCAM 64 …
A warm super-Neptune around the G-dwarf star TOI-1710 revealed with TESS, SOPHIE, and HARPS-N
Deleuil, M.; Moutou, C.; Carmona, A. +50 more
We report the discovery and characterization of the transiting extrasolar planet TOI-1710 b. It was first identified as a promising candidate by the Transiting Exoplanet Survey Satellite. Its planetary nature was then established with SOPHIE and HARPS-N spectroscopic observations via the radial-velocity method. The stellar parameters for the host …
Exploring X-ray variability with unsupervised machine learning. I. Self-organizing maps applied to XMM-Newton data
Salvaterra, R.; Belfiore, A.; Marelli, M. +3 more
Context. XMM-Newton provides unprecedented insight into the X-ray Universe, recording variability information for hundreds of thousands of sources. Manually searching for interesting patterns in light curves is impractical, requiring an automated data-mining approach for the characterization of sources.
Aims: Straightforward fitting of tempor…