Search Publications
The Gaia-ESO Survey: Old super-metal-rich visitors from the inner Galaxy
Gilmore, G.; Guiglion, G.; Randich, S. +12 more
Context. The solar vicinity is currently populated by a mix of stars with various chemo-dynamic properties, including stars with a high metallicity compared to the Sun. Dynamical processes such as churning and blurring are expected to relocate such metal-rich stars from the inner Galaxy to the solar region.
Aims: We report the identification …
Comparing the host galaxy ages of X-ray selected AGN in COSMOS. Obscured AGN are associated with older galaxies
Georgantopoulos, I.; Lanzuisi, G.; Mountrichas, G. +3 more
We explore the properties of the host galaxies of X-ray selected AGN in the COSMOS field using the Chandra Legacy sample and the LEGA-C survey VLT optical spectra. Our main goal is to compare the relative ages of the host galaxies of the obscured and unobscured AGN by means of the calcium break Dn(4000) and the Hδ Balmer line…
A characterization of ASAS-SN core-collapse supernova environments with VLT+MUSE. I. Sample selection, analysis of local environments, and correlations with light curve properties
Lyman, J. D.; Galbany, L.; Gutiérrez, C. P. +17 more
Context. The analysis of core-collapse supernova (CCSN) environments can provide important information on the life cycle of massive stars and constrain the progenitor properties of these powerful explosions. The MUSE instrument at the Very Large Telescope (VLT) enables detailed local environment constraints of the progenitors of large samples of C…
Spitzer thermal phase curve of WASP-121 b
Morello, G.; Lagage, P. -O.; Tan, J. C. +2 more
Aims: We analyse unpublished Spitzer observations of the thermal phase-curve of WASP-121 b, a benchmark ultra-hot Jupiter.
Methods: We adopted the wavelet pixel-independent component analysis technique to remove challenging instrumental systematic effects in these datasets and we fit them simultaneously with parametric light-curve models…
Spectroscopy of the supernova H0pe host galaxy at redshift 1.78
Ryan, R. E.; Yun, M. S.; Dole, H. +42 more
Supernova (SN) H0pe was discovered as a new transient in James Webb Space Telescope (JWST) NIRCam images of the galaxy cluster
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…