Search Publications
UNIONS: The impact of systematic errors on weak-lensing peak counts
Gavazzi, Raphaël; Hudson, Michael J.; Kilbinger, Martin +6 more
Context. The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is an ongoing deep photometric multiband survey of the northern sky. As part of UNIONS, the Canada-France Imaging Survey (CFIS) provides r-band data, which we use to study weak-lensing peak counts for cosmological inference.
Aims: We assess systematic effects for weak-len…
The GRAVITY young stellar object survey. X. Probing the inner disk and magnetospheric accretion region of CI Tau
Lutz, D.; Sturm, E.; Tacconi, L. J. +52 more
Context. T Tauri stars are known to be the cradle of planet formation. Most exoplanets discovered to date lie at the very inner part of the circumstellar disk (<1 au). The innermost scale of young stellar objects is therefore a compelling region to be addressed, and long-baseline interferometry is a key technique to unveil their mysteries.
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The role of radial migration in open cluster and field star populations with Gaia DR3
Randich, S.; Spina, L.; Magrini, L. +4 more
Context. The survival time of a star cluster depends on its total mass, density, and thus size, as well as on the environment in which it was born and in which lies. Its dynamical evolution is influenced by various factors such as gravitational effects of the Galactic bar, spiral structures, and molecular clouds. Overall, the factors that determin…
Gaia Data Release 3. Surface brightness profiles of galaxies and host galaxies of quasars
Ducourant, C.; Gavras, P.; Pourbaix, D. +13 more
Context. Since July 2014, the Gaia space mission has been continuously scanning the sky and observing the extragalactic Universe with unprecedented spatial resolution in the optical domain (∼180 mas by the end of the mission). Gaia provides an opportunity to study the morphology of the galaxies of the local Universe (z < 0.45) with much higher …
Characterising fast-time variations in the hard X-ray time profiles of solar flares using Solar Orbiter's STIX
Krucker, Säm; Harra, Louise K.; Hayes, Laura A. +2 more
Aims: The aim of this work is to develop a method to systematically detect and characterise fast-time variations (≳1 s) in the non-thermal hard X-ray (HXR) time profiles of solar flares using high-resolution data from Solar Orbiter's Spectrometer/Telescope for Imaging X-rays (STIX).
Methods: The HXR time profiles were smoothed using Gaus…
Properties of luminous red supergiant stars in the Magellanic Clouds
Boutsia, K.; Zapartas, E.; de Wit, S. +5 more
Context. There is evidence that some red supergiants (RSGs) experience short-lived phases of extreme mass loss, producing copious amounts of dust. These episodic outburst phases help strip the hydrogen envelope from evolved massive stars, drastically affecting their evolution. However, to date, the observational data of episodic mass loss is limit…
GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth
Amado, P. J.; Caballero, J. A.; Reiners, A. +63 more
One of the main scientific goals of the TESS mission is the discovery of transiting small planets around the closest and brightest stars in the sky. Here, using data from the CARMENES, MAROON-X, and HIRES spectrographs together with TESS, we report the discovery and mass determination of aplanetary system around the M1.5 V star GJ 806 (TOI-4481). …
Large Interferometer For Exoplanets (LIFE). X. Detectability of currently known exoplanets and synergies with future IR/O/UV reflected-starlight imaging missions
Beichman, Charles A.; García Muñoz, Antonio; Stapelfeldt, Karl R. +10 more
Context. The next generation of space-based observatories will characterize the atmospheres of low-mass, temperate exoplanets with the direct-imaging technique. This will be a major step forward in our understanding of exoplanet diversity and the prevalence of potentially habitable conditions beyond the Earth.
Aims: We compute a list of curre…
Multi-probe analysis of the galaxy cluster CL J1226.9+3332. Hydrostatic mass and hydrostatic-to-lensing bias
Berta, S.; Aussel, H.; Adam, R. +50 more
The precise estimation of the mass of galaxy clusters is a major issue for cosmology. Large galaxy cluster surveys rely on scaling laws that relate cluster observables to their masses. From the high-resolution observations of ∼45 galaxy clusters with the NIKA2 and XMM-Newton instruments, the NIKA2 Sunyaev-Zel'dovich Large Program should provide an…
M giants with IGRINS. I. Stellar parameters and α-abundance trends of the solar neighborhood population
Ryde, N.; Casagrande, L.; Nandakumar, G. +1 more
Context. Cool stars, such as M giants, can only be analyzed in the near-infrared (NIR) regime due to the ubiquitous titanium oxide features in optical spectra of stars with Teff < 4000 K. In dust-obscured regions, the inner bulge and Galactic center region, the intrinsically bright M giants observed in the NIR are an optimal option f…