Search Publications
The influence of small bipolar magnetic regions on basic solar quantities
Solanki, S. K.; Krivova, N. A.; Jiang, J. +2 more
Context. Understanding the evolution of the solar magnetic field is of great importance for heliosphere, dynamo, and irradiance studies, for example. While the contribution of the field in active regions (ARs) hosting sunspots to the Sun's large-scale field has been extensively modelled, we still lack a realistic model of the contribution of small…
Detailed cool star flare morphology with CHEOPS and TESS***
Alonso, R.; Deleuil, M.; Erikson, A. +79 more
Context. White-light stellar flares are proxies for some of the most energetic types of flares, but their triggering mechanism is still poorly understood. As they are associated with strong X and ultraviolet emission, their study is particularly relevant to estimate the amount of high-energy irradiation onto the atmospheres of exoplanets, especial…
JWST observations of the Horsehead photon-dominated region. I. First results from multi-band near- and mid-infrared imaging
Abergel, A.; Bouchet, P.; Brandl, B. R. +14 more
Context. The James Webb Space Telescope (JWST) has captured the sharpest infrared images ever taken of the Horsehead nebula, a prototypical moderately irradiated photon-dominated region (PDR) that is fully representative of most of the UV-illuminated molecular gas in the Milky Way and star-forming galaxies.
Aims: We investigate the impact of …
V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system
Ménard, François; Ribas, Álvaro; Macías, Enrique +8 more
Context. V892 Tau is a young binary star surrounded by a circumbinary disc that shows hints of an interaction with the low-mass nearby star V892 Tau NE.
Aims: The goal of this paper is to constrain the orbit of V892 Tau NE and to determine the resulting circumbinary disc dynamics.
Methods: We present new ALMA observations of the V892 Tau…
Accretion rates of 42 nova-like stars with IUE and Gaia data
Selvelli, Pierluigi; Gilmozzi, Roberto
We analyzed more than 700 ultraviolet spectra of 45 nova-like stars (NLs) observed with the International Ultraviolet Explorer (IUE) satellite, obtaining reliable data for 42 of them. Combining these with the distances from the Gaia Early Data Release 3 (EDR3) and with results from the literature, for each object we determined the reddening E…
Application of Convolutional Neural Networks to time domain astrophysics. 2D image analysis of OGLE light curves
Bayo, A.; Angeloni, R.; Monsalves, N. +4 more
In recent years the amount of publicly available astronomical data has increased exponentially, with a remarkable example being large-scale multiepoch photometric surveys. This wealth of data poses challenges to the classical methodologies commonly employed in the study of variable objects. As a response, deep learning techniques are increasingly …
Stellar Population Astrophysics (SPA) with TNG. Fluorine abundances in seven open clusters
Bragaglia, A.; Sanna, N.; D'Orazi, V. +9 more
Context. The age, evolution, and chemical properties of the Galactic disk can be effectively ascertained using open clusters. Within the large program Stellar Populations Astrophysics at the Telescopio Nazionale Galileo, we specifically focused on stars in open clusters, to investigate various astrophysical topics, from the chemical content of ver…
Revisiting the dynamical masses of the transiting planets in the young AU Mic system: Potential AU Mic b inflation at 20 Myr
Aigrain, S.; Nagel, E.; Amado, P. J. +26 more
Context. Understanding planet formation is important in the context of the origin of planetary systems in general and of the Solar System in particular, as well as to predict the likelihood of finding Jupiter, Neptune, and Earth analogues around other stars. Aims. We aim to precisely determine the radii and dynamical masses of transiting planets o…
12C/13C of Kepler giant stars: The missing piece of the mixing puzzle
Reylé, C.; Lagarde, N.; Miglio, A. +6 more
Context. Despite a rich observational background, few spectroscopic studies have dealt with the measurement of the carbon isotopic ratio in giant stars. However, it is a key element in understanding the mixing mechanisms that occur in the interiors of giant stars.
Aims: We present the CNO and 12C/13C abundances derived f…
Spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during its 2023 outburst
Sanna, A.; Papitto, A.; Di Salvo, T. +13 more
We present a comprehensive study of the spectral properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during its 2023 outburst. Similar to other accreting millisecond X-ray pulsars, the broadband spectral emission observed quasi-simultaneously by NICER and NuSTAR is well described by an absorbed Comptonized emission with an electro…