Search Publications
The multiplicity of massive stars in the Scorpius OB1 association through high-contrast imaging
Pauwels, T.; Sana, H.; Reggiani, M. +2 more
Context. Despite past efforts, a comprehensive theory of massive star formation is still lacking. One of the most remarkable properties of massive stars is that almost all of them are found in binaries or higher-order multiple systems. Since multiplicity is an important outcome parameter of a star formation process, observations that cover the ful…
Gas kinematics around filamentary structures in the Orion B cloud
Peretto, Nicolas; Hughes, Annie; Kainulainen, Jouni +27 more
Context. Understanding the initial properties of star-forming material and how they affect the star formation process is key. From an observational point of view, the feedback from young high-mass stars on future star formation properties is still poorly constrained.
Aims: In the framework of the IRAM 30m ORION-B large program, we obtained ob…
OH mid-infrared emission as a diagnostic of H2O UV photodissociation. II. Application to interstellar photodissociation regions
Le Petit, F.; van Dishoeck, E. F.; Bron, E. +3 more
Context. Water photodissociation in the 114-143 nm UV range forms excited OH which emits at mid-infrared (MIR) wavelengths via highly excited rotational lines. These lines have only been detected with Spitzer in proto-planetary disks and shocks. Previous studies have shown that they are a unique diagnostic for water photodissociation. Thanks to it…
Effect of the initial mass function on the dynamical SMBH mass estimate in the nucleated early-type galaxy FCC 47
Fahrion, Katja; van de Ven, Glenn; Nguyen, Dieu D. +4 more
Supermassive black holes (SMBHs) and nuclear star clusters (NSCs) co-exist in many galaxies. While the formation history of the black hole is essentially lost, NSCs preserve their evolutionary history imprinted onto their stellar populations and kinematics. Studying SMBHs and NSCs in tandem might help us to ultimately reveal the build-up of galaxy…
Temporal albedo variability in the phase curve of KELT-1b
Parviainen, H.
The dayside brightness spectrum of a highly irradiated transiting brown dwarf KELT-1b is challenging to explain based on current brown dwarf atmosphere models. The spectrum has been measured from observations spanning ten years and covering high-precision secondary eclipses and phase curves from space in blue-visible (CHaracterising ExOPlanet Sate…
Accounting for differential rotation in calculations of the Sun's angular momentum-loss rate
Brun, A. S.; Finley, A. J.
Context. Sun-like stars shed angular momentum due to the presence of magnetised stellar winds. Magnetohydrodynamic models have been successful in exploring the dependence of this `wind-braking torque' on various stellar properties; however the influence of surface differential rotation is largely unexplored. As the wind-braking torque depends on t…
The JWST view of the barred galaxy population in the SMACS0723 galaxy cluster
Costantin, L.; Méndez-Abreu, J.; Kruk, S.
Context. The cosmic evolution of the barred galaxy population provides key information about the secular evolution of galaxies and the settling of rotationally dominated discs.
Aims: We study the bar fraction in the SMACSJ0723.37323 (SMACS0723) cluster of galaxies at z = 0.39 using the Early Release Observations obtained with the NIRCam instr…
Reconstructing the extended structure of multiple sources strongly lensed by the ultra-massive elliptical galaxy SDSS J0100+1818
Grillo, C.; Christensen, L.; Suyu, S. H. +2 more
We study the total and baryonic mass distributions of the deflector SDSS J0100+1818 through a full strong lensing analysis. The system is composed of an ultra-massive early-type galaxy at z = 0.581, with a total stellar mass of (1.5 ± 0.3)×1012 M⊙ and a stellar velocity dispersion of (450 ± 40) km s−1, surrounded b…
The Kormendy relation of early-type galaxies as a function of wavelength in Abell S1063, MACS J0416.1-2403, and MACS J1149.5+2223
Grillo, C.; Rosati, P.; Vanzella, E. +9 more
Context. The wavelength dependence of the projection of the fundamental plane along the velocity dispersion axis, namely the Kormendy relation, is well characterised at low redshift but poorly studied at intermediate redshifts. The Kormendy relation provides information on the evolution of the population of early-type galaxies (ETGs). Therefore, b…
Planets around evolved intermediate-mass stars. III. Planet candidates and long-term activity signals in six open clusters
Sousa, S. G.; Lovis, C.; Santos, N. C. +6 more
Context. We carried out a long-term campaign spanning 17 year to obtain high-precision radial velocities (RVs) with the HARPS spectrograph for a large sample of evolved stars in open clusters.
Aims: The aim of this work is to search for planets around evolved stars, with a special focus on stars more massive than 2 M⊙ in light of p…