Search Publications
Gaia search for early-formed andesitic asteroidal crusts
Galluccio, L.; Delbo, M.; Avdellidou, C. +2 more
Context. Andesitic meteorites are among the oldest achondrites known to date. They record volcanic events and crust formation episodes in primordial planetesimals that took place about 4.565 Myr ago. However, no analogue for these meteorites has been found in the asteroid population to date.
Aims: We searched for spectroscopic analogues of th…
Galactic population synthesis of radioactive nucleosynthesis ejecta
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +3 more
Diffuse γ-ray line emission traces freshly produced radioisotopes in the interstellar gas, providing a unique perspective on the entire Galactic cycle of matter from nucleosynthesis in massive stars to their ejection and mixing in the interstellar medium (ISM). We aim to construct a model of nucleosynthesis ejecta on a galactic scale that is speci…
Binary star population of the Sculptor dwarf galaxy
McConnachie, Alan W.; Tolstoy, Eline; Irwin, Michael J. +3 more
Aims: We aim to compute the binary fraction of "classical" dwarf spheroidal galaxies (dSphs) that are satellites of the Milky Way (MW). This value can offer insights into the binary fraction in environments that are less dense and more metal-poor than our own galaxy. Additionally, knowledge of the binary fraction in dwarf galaxies is importan…
Asteroids seen by JWST-MIRI: Radiometric size, distance, and orbit constraints
Müller, T. G.; Micheli, M.; Bartczak, P. +3 more
Infrared measurements of asteroids are crucial for the determination of physical and thermal properties of individual objects, and for understanding the small-body populations in the solar system as a whole. However, standard radiometric methods can only be applied if the orbit of an object is known, hence its position at the time of the observati…
Refining the properties of the TOI-178 system with CHEOPS and TESS
Alonso, R.; Deleuil, M.; Erikson, A. +84 more
Context. The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with radii ranging from ~1.1 to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All planets but the innermost one form a chain of Laplace resonances. Mass estimates derived from a preliminary radial vel…
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…