Search Publications
X-ray emission from cosmic web filaments in SRG/eROSITA data
Aghanim, N.; Douspis, M.; Malavasi, N. +1 more
Using the publicly available eROSITA Final Equatorial Depth Survey (eFEDS) data, we detected the stacked X-ray emissions at the position of 463 filaments at a significance of 3.8σ based on the combination of all energy bands. In parallel, we found that the probability of the measurement under the null hypothesis is ∼0.0017. The filaments were iden…
Detection of period-spacing patterns due to the gravity modes of rotating dwarfs in the TESS southern continuous viewing zone
Garcia, S.; De Ridder, J.; Aerts, C. +3 more
Context. The theory of stellar evolution presents shortcomings when confronted with asteroseismic probes of interior physical properties. The differences between observations and theory are often great because stellar models have mainly been calibrated from observables connected to the surface of stars. Period-spacing patterns caused by gravity mo…
A self-consistent dynamical model of the Milky Way disc adjusted to Gaia data
Figueras, F.; Reylé, C.; Mor, R. +6 more
Context. Accurate astrometry achieved by Gaia for many stars in the Milky Way provides an opportunity to reanalyse the Galactic stellar populations from a large and homogeneous sample and to revisit the Galaxy gravitational potential.
Aims: This paper shows how a self-consistent dynamical model can be obtained by fitting the gravitational pot…
Gaia EDR3 distances of the young stellar clusters in the extended Carina Nebula complex
Preibisch, T.; Göppl, C.
Context. The Carina Nebula complex (CNC) is one of the most massive and active star-forming regions in our Galaxy and it contains several large young star clusters. The distances of the individual clusters and their physical connection were poorly known up to now, with strongly discrepant results reported in the literature.
Aims: We want to d…
Two long-period transiting exoplanets on eccentric orbits: NGTS-20 b (TOI-5152 b) and TOI-5153 b
Bouchy, F.; Queloz, D.; Henning, T. +50 more
Context. Long-period transiting planets provide the opportunity to better understand the formation and evolution of planetary systems. Their atmospheric properties remain largely unaltered by tidal or radiative effects of the host star, and their orbital arrangement reflects a different and less extreme migrational history compared to close-in obj…
[Mg/Fe] ratios in the solar neighbourhood: Stellar yields and chemical evolution scenarios
Recio-Blanco, Alejandra; Matteucci, Francesca; Palla, Marco +1 more
Context. The [Mg/Fe] abundance ratios are a fundamental fossil signature used to trace the chemical evolution of the disc and to divide it into low-α and high-α populations. Despite the huge observational and theoretical efforts, discrepancies between models and data are still present and several explanations have been put forward to explain the […
The VLT-FLAMES survey of massive stars. NGC 2004#115: A triple system hosting a possible short period B+BH binary
Dufton, P. L.; Lennon, D. J.; Monageng, I. M. +5 more
Context. NGC 2004#115 was classified as a single lined Be spectroscopic binary in the Large Magellanic Cloud. Its Hα morphology is reminiscent of the Galactic systems LB-1 and HR 6819, both of which are proposed as either Be+BH or Be+stripped He-star systems.
Aims: Multi-epoch optical spectra of NGC 2004#115 are used to determine if this bina…
Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS
Alonso, R.; Deleuil, M.; Erikson, A. +79 more
Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipses lead to the measurement of the planetary geometric albedo, Ag, which is an indicator of the prese…
Radial velocity variability and the evolution of hot subdwarf stars
Geier, S.; Heber, U.; Irrgang, A. +3 more
Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars, since they are likely formed by close binary interactions. In this work, we perform a radial velocity (RV) variability study of a sample of 646 hot subdwarfs with multi-epoch radial velocities based on spectra from Sloan Digital Sky Survey (SDSS) and Large S…
Coronal condensation as the source of transition-region supersonic downflows above a sunspot
Tian, Hui; Peter, Hardi; Hou, Zhenyong +3 more
Context. Plasma loops or plumes rooted in sunspot umbrae often harbor downflows with speeds of 100 km s−1. These downflows are supersonic at transition region temperatures of ∼0.1 MK. The source of these flows is not well understood.
Aims: We aim to investigate the source of sunspot supersonic downflows (SSDs) in active region 1274…