Search Publications
Galaxy cluster strong lensing cosmography. Cosmological constraints from a sample of regular galaxy clusters
Grillo, C.; Rosati, P.; Caminha, G. B. +1 more
Cluster strong lensing cosmography is a promising probe of the background geometry of the Universe and several studies have emerged thanks to the increased quality of observations using space- and ground-based telescopes. For the first time, we used a sample of five cluster strong lenses to measure the values of cosmological parameters and combine…
Asteroseismology of the multiple stellar populations in the globular cluster M4
Milone, A. P.; Tailo, M.; Bragaglia, A. +6 more
We present a new asteroseismic analysis of the stars in the globular cluster (GC) M4 based on the data collected by the K2 mission. We report the detection of solar-like oscillation in 37 stars, 32 red giant branch (RGB) and six red horizontal branch (rHB) stars, which is the largest sample for this kind of study in GCs up to date. Combining infor…
Improved strong lensing modelling of galaxy clusters using the Fundamental Plane: Detailed mapping of the baryonic and dark matter mass distribution of Abell S1063
Grillo, C.; Rosati, P.; Meneghetti, M. +6 more
Aims: From accurate photometric and spectroscopic information, we build the Fundamental Plane (FP) relation for the early-type galaxies of the cluster Abell S1063. We use this relation to develop an improved strong lensing model of the cluster, and we decompose the cluster's cumulative projected total mass profile into its stellar, hot gas, a…
The structure of jets launched from post-AGB binary systems
De Marco, O.; Verhamme, O.; Van Winckel, H. +4 more
Context. In this paper, we focus on post-asymptotic giant branch (post-AGB) binaries and study the interaction between the different components of these complex systems. These components comprise the post-AGB primary, a main sequence secondary, a circumbinary disk, as well as a fast bipolar outflow (jet) launched by the companion. We obtained well…
MUSE spectroscopy of the ULX NGC 1313 X-1: A shock-ionised bubble, an X-ray photoionised nebula, and two supernova remnants
Godet, O.; Contini, T.; Olive, J. -F. +2 more
Context. The presence of large ionised gaseous nebulae found around some ultraluminous X-ray sources (ULXs) provides the means to assess the mechanical and radiative feedback of the central source, and hence constrain the efficiency and impact on the surroundings of the super-Eddington regime powering most of these sources. NGC 1313 X-1 is an arch…
The Gaia EDR3 view of Johnson-Kron-Cousins standard stars: the curated Landolt and Stetson collections
Rainer, M.; Marinoni, S.; Marrese, P. M. +7 more
Context. In the era of large surveys and space missions, it is necessary to rely on large samples of well-characterized stars for inter-calibrating and comparing measurements from different surveys and catalogues. Among the most employed photometric systems, the Johnson-Kron-Cousins has been used for decades and for a large amount of important dat…
The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc
Amado, P. J.; Caballero, J. A.; Pallé, E. +64 more
We report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of Rb = 1.240 ± 0.023 R⊕, a mass of Mb = 2.14 ± 0.34 M⊕, and a bulk density of ρb
J-PLUS: Spectral evolution of white dwarfs by PDF analysis
Hernández-Monteagudo, C.; Gänsicke, B. T.; Carrasco, J. M. +17 more
Aims: We estimated the spectral evolution of white dwarfs with effective temperature using the Javalambre Photometric Local Universe Survey (J-PLUS) second data release (DR2), which provides 12 photometric optical passbands over 2176 deg2.
Methods: We analyzed 5926 white dwarfs with r ≤ 19.5 mag in common between a white dwarf…
LAMOST meets Gaia: The Galactic open clusters
Fu, Xiaoting; Xu, Yan; Chang, Jiang +14 more
Open clusters (OCs) are born and evolve along the Milky Way (MW) plane. On them is imprinted the history of the Galactic disc, including its chemical and dynamical evolution. Chemical and dynamical properties of OCs can be derived from photometric, spectroscopic, and astrometric data of their member stars. Based on the photometric and astrometric …
TOI-3884 b: A rare 6-RE planet that transits a low-mass star with a giant and likely polar spot
Bouchy, F.; Bonfils, X.; Ciardi, D. R. +19 more
The Transiting Exoplanet Survey Satellite mission identified a deep and asymmetric transit-like signal with a periodicity of 4.5 days orbiting the M4 dwarf star TOI-3884. The signal has been confirmed by follow-up observations collected by the ExTrA facility and Las Cumbres Observatory Global Telescope, which reveal that the transit is chromatic. …