Search Publications
Origin of the diffuse 4-8 keV emission in M 82
Gilli, R.; Iwasawa, K.; Gandhi, P. +2 more
We present the first spatially resolved, X-ray spectroscopic study of the 4−8 keV diffuse emission found in the central part of the nearby starburst galaxy M 82 on a few arcsecond scales. The new details that we see allow a number of important conclusions to be drawn on the nature of the hot gas and its origin as well as feedback on the interstell…
Rotational radial shear in the low solar photosphere
Corbard, T.; Faurobert, M.; Gelly, B. +2 more
Context. Radial differential rotation is an important physical ingredient in stellar dynamo theory. In the case of the Sun, heliosismology techniques have revealed the existence of a near-surface shear layer covering 15-20% of the upper convection zone. It was recently shown that the rotation velocity gradient is not uniform in this layer and that…
RXCJ1111.6+4050 galaxy cluster: Observational evidence of a transitional fossil group
Böhringer, H.; Chon, G.; Barrena, R. +2 more
We present a detailed kinematical and dynamical study of the galaxy cluster RXCJ1111.6+4050 (RXCJ1111), at z = 0.0756 using 104 new spectroscopic redshifts of galaxies observed at the Telescopio Nazionale Galileo and SDSS DR16 public archive. Our analysis is performed in a multiwavelength context in order to study and compare mainly optical and X-…
Coronal voids and their magnetic nature
Schmidt, W.; Woch, J.; Barczynski, K. +68 more
Context. Extreme ultraviolet (EUV) observations of the quiet solar atmosphere reveal extended regions of weak emission compared to the ambient quiescent corona. The magnetic nature of these coronal features is not well understood.
Aims: We study the magnetic properties of the weakly emitting extended regions, which we name coronal voids. In p…
No random transits in CHEOPS observations of HD 139139
Guterman, P.; Alonso, R.; Deleuil, M. +77 more
Context. The star HD 139139 (a.k.a. `the Random Transiter') is a star that exhibited enigmatic transit-like features with no apparent periodicity in K2 data. The shallow depth of the events (~200 ppm - equivalent to transiting objects with radii of ~1.5 R⊕ in front of a Sun-like star) and their non-periodicity constitute a challenge for…
The planetary system around HD 190622 (TOI-1054). Measuring the gas content of low-mass planets orbiting F-stars
Alonso, R.; Deleuil, M.; Erikson, A. +107 more
Context. Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constraints improve our understanding of planetary formation processes such as the delivery of volatile-rich planetesima…
Statistical study of extreme-ultraviolet nanoflares in the quiet-Sun transition region
Fludra, A.
Aims: We carried out a large statistical study of ubiquitous small-scale extreme-ultraviolet (EUV) brightenings in the nanoflare energy range in the quiet-Sun transition region to derive their properties, estimate their contribution to the heating of the solar atmosphere, and compare their numbers to the coronal events published in the litera…
Uncovering the MIR emission of quiescent galaxies with JWST
Gómez-Guijarro, C.; Magdis, G. E.; Rigopoulou, D. +15 more
We present a study of the mid-IR (MIR) emission of quiescent galaxies (QGs) beyond the local universe. Using deep JWST imaging in the SMACS-0723 cluster field we identify a mass-limited (M* > 109 M⊙) sample of intermediate redshift QGs (0.2 < z < 0.7) and perform modelling of their rest-frame UV to MIR pho…
The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association
Pinte, C.; Ménard, F.; Augereau, J. -C. +17 more
Context. Circumstellar debris disks provide insight into the formation and early evolution of planetary systems. Resolved belts in particular help to locate planetesimals in exosystems, and can hint at the presence of disk-sculpting exoplanets.
Aims: We study the circumstellar environment of HD 112810 (HIP 63439), a mid-F-type star in the Sco…
Multi-instrument analysis of 67P/Churyumov-Gerasimenko coma particles: COPS-GIADA data fusion
Altwegg, K.; Rubin, M.; Hänni, N. +6 more
Context. The European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko has offered scientists the opportunity to study a comet in unprecedented detail. Four instruments of the Rosetta orbiter, namely, the Micro-Imaging Dust Analysis System (MIDAS), the Grain Impact Analyzer and Dust Accumulator (GIADA), the COmetary Secondary Ion …