Search Publications
Variable stars in the VVV globular clusters: III. RR Lyrae stars in the inner Galactic globular clusters
Carballo-Bello, Julio A.; Smith, Leigh C.; Minniti, Dante +13 more
Context. High reddening near the Galactic plane hampers observations and proper characterization of the globular clusters (GCs) located toward the inner regions of the Milky Way. Aims. The VISTA Variables in the Vía Láctea (VVV) survey observed the Galactic bulge and adjacent disk for several years, providing multi-epoch, near-infrared images for …
Possible contributions of two nearby blazars to the NGC 4151 neutrino hotspot
Barnier, S.; Inoue, Y.; Omeliukh, A.
Context. The origin of the high-energy astrophysical neutrinos discovered by IceCube remains unclear, with both blazars and Seyfert galaxies emerging as potential sources. Recently, the IceCube Collaboration reported a ∼3σ neutrino signal from the direction of the nearby Seyfert galaxy NGC 4151. However, two gamma-ray-loud BL Lac objects, 4FGL 121…
A theoretical framework for BL Her stars: III. A case study: Robust light curve optimization in the Large Magellanic Cloud
Marconi, Marcella; Ripepi, Vincenzo; Joyce, Meridith +8 more
Context. In the era of precision stellar astrophysics, classical pulsating stars play a crucial role in determinations of the cosmological distance scale thanks to their period-luminosity (PL) relations. Therefore, it is important to constrain their stellar evolution and pulsation models not only through a comparison of empirical and theoretical P…
Characterization of seven transiting systems, including four warm Jupiters from SOPHIE and TESS
Deleuil, M.; Moutou, C.; Carmona, A. +65 more
While several thousand exoplanets are now confirmed, the number of known transiting warm Jupiters (10 d < period < 200 d) remains relatively small. These planets are generally believed to have formed outside the snowline and migrated to their current orbits. Because they are sufficiently distant from their host stars, they mitigate proximity…
ALMA observations of CO isotopologues towards six obscured post-asymptotic giant branch stars
Olofsson, H.; Sahai, R.; Sánchez Contreras, C. +13 more
Context. Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB) when an efficient mass-loss process removes a significant fraction of their initial mass. For most sources, this mass-loss process relies on the interplay between convection, stellar pulsations, and dust formation. However, predicting the mass-loss history o…
Discovery of a persistent radio source associated with FRB 20240114A
Piro, L.; Palazzi, E.; Rossi, A. +6 more
Aims. We present the discovery of a fourth persistent radio source (PRS) associated with a fast radio burst (FRB). Methods. Following previous indications of a candidate PRS associated with FRB 20240114A, we performed deep Very Long Baseline Array observations at 5 GHz to test the presence of a compact radio source within the uncertainty position …
A novel method for estimating the far-ultraviolet flux, and a catalogue for disc-hosting stars in nearby star-forming regions
Testi, Leonardo; Rosotti, Giovanni; Zari, Eleonora +4 more
When protoplanetary discs are externally irradiated by far-ultraviolet (FUV) photons from OBA-type stars, they lose material through photoevaporative winds. This reduces the amount of material that is available to form planets. Understanding the link between the environmental irradiation and the observed disc properties requires accurately evaluat…
A new method for determining the onset times of solar energetic particles and their uncertainties: Poisson-CUSUM bootstrap hybrid method
Gutiérrez, C. P.; Vainio, R.; Dresing, N. +2 more
Context. Solar energetic particle (SEP) events are a type of space weather phenomena in which highly energetic charged particles are released from the Sun into interplanetary space by violent and eruptive phenomena, such as solar flares and coronal mass ejections. In order to assess the origin of SEPs, an accurate timing of their arrival at spacec…
The IACOB project: XIV. New clues on the location of the TAMS in the massive star domain
Simón-Díaz, S.; Urbaneja, M. A.; de Burgos, A. +4 more
Context. Massive stars play a very important role in many astrophysical fields. Despite their scarcity with respect to less-massive counterparts, their influence on the chemo-dynamical evolution of the galaxies is substantial. Yet, some fundamental aspects of their evolution remain poorly constrained. In this regard, there is an open debate on the…
The wide binary frequency of metal-poor stars
Clavero, R.; Martín, E. L.; Nespral, D. +5 more
Context. This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Aims. Our goal is to look for wide common proper motion companions to metal-p…