Search Publications
The dawn of a new era for dustless HdC stars with Gaia eDR3
Kasliwal, M. M.; Karambelkar, V.; Tisserand, P. +7 more
Context. Decades after their discovery, only four hydrogen-deficient carbon (HdC) stars were known to have no circumstellar dust shell. This is in complete contrast to the ∼130 known Galactic HdC stars that are notorious for being heavy dust producers, that is the R Coronae Borealis (RCB) stars. Together, they form a rare class of supergiant stars…
X-ray studies of the Abell 3158 galaxy cluster with eROSITA
Pacaud, F.; Ramos-Ceja, M. E.; Bulbul, E. +13 more
Context. The most nearby clusters are the best places for studying physical and enrichment effects in the faint cluster outskirts. The Abell 3158 cluster (A3158), located at z = 0.059, is quite extended with a characteristic radius r200 = 23.95 arcmin. The metal distribution in the outskirts of this cluster has previously been studied w…
Stellar population of the Rosette Nebula and NGC 2244. Application of the probabilistic random forest
Peña Ramírez, K.; Bouy, H.; Krone-Martins, A. +5 more
Context. Measurements of internal dynamics of young clusters and star-forming regions are crucial to fully understand the process of their formation. A basic prerequisite for this is a well-established and robust list of probable members.
Aims: In this work, we study the 2.8° ×2.6° region in the emblematic Rosette Nebula, centred in the young…
Flares and rotation of M dwarfs with habitable zones accessible to TESS planet detections
Stelzer, B.; Raetz, St.; Magaudda, E. +1 more
Context. More than 4000 exoplanets have been discovered to date, providing the search for a place capable of hosting life with a large number of targets. With the Transiting Exoplanet Survey Satellite (TESS) having completed its primary mission in July 2020, the number of planets confirmed by follow-up observations is growing further. Crucial for …
Evidence of ram-pressure stripping of WLM, a dwarf galaxy far away from any large host galaxy
Józsa, Gyula I. G.; McConnachie, Alan W.; Hammer, Francois +5 more
Dwarf galaxies are affected by all the evolutionary processes normally at work in galaxies of any mass. As fainter and less massive galaxies, however, dwarf galaxies are particularly susceptible to environmental mechanisms that can more easily perturb these systems. Importantly, the presence of nearby large galaxies is expected to have a profound …
The VVV survey: Long-period variable stars. I. Photometric catalog of ten VVV/OGLE tiles
Minniti, D.; Zoccali, M.; Rojas-Arriagada, A. +7 more
Context. Long-period variable stars (LPVs) are pulsating red giants, primarily in the asymptotic giant branch phase, and they include both Miras and semi-regular variables (SRVs). Their period-age and period-luminosity relations enable us to trace different stellar populations, as they are intrinsically very bright and cover a wide range in distan…
Apsidal motion in massive eccentric binaries: The case of CPD-41° 7742, and HD 152218 revisited
Gosset, E.; Sterken, C.; Nazé, Y. +2 more
Context. This paper is part of a study of the apsidal motion in close eccentric massive binary systems, which aims to constrain the internal structure of the stars. We focus on the binary CPD-41° 7742 and briefly revisit the case of HD 152218.
Aims: Independent studies of CPD-41° 7742 in the past showed large discrepancies in the longitude of…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XII. Ionised gas emission in the inner regions of lenticular galaxies
Andreani, P.; Ferrarese, L.; Buat, V. +24 more
As part of the Virgo Cluster Survey Tracing Ionised Gas Emission, a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT, we discovered eight massive (1010 ≲ Mstar ≲ 1011 M⊙) lenticular galaxies with prominent ionised gas emission features in their inner (a …
MINCE. I. Presentation of the project and of the first year sample
Hansen, C. J.; Bonifacio, P.; Caffau, E. +20 more
Context. In recent years, Galactic archaeology has become a particularly vibrant field of astronomy, with its main focus set on the oldest stars of our Galaxy. In most cases, these stars have been identified as the most metal-poor. However, the struggle to find these ancient fossils has produced an important bias in the observations - in particula…
Electron dynamics in small magnetospheres. Insights from global, fully kinetic plasma simulations of the planet Mercury
Henri, Pierre; André, Nicolas; Aizawa, Sae +4 more
Context. The planet Mercury possesses a small but highly dynamic magnetosphere in which the role and dynamics of electrons are still largely unknown.
Aims: We aim to model the global dynamics of solar-wind electrons impinging on Mercury's magnetosphere. Particular relevance is given to local acceleration processes and the global circulation p…