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D.D. 555/2025 Pubblica selezione per titoli e colloquio per il conferimento di n. 1 borsa di studio, della durata di 12 mesi, eventualmente rinnovabile, dal titolo “Studio di metodologie di Machine Learning e Visualizzazione per l’analisi di Dati Astrofisici da SKA”

Pubblica selezione per titoli e colloquio per il conferimento di n. 1 borsa di studio, della durata di 12 mesi, eventualmente rinnovabile, dal titolo “Studio di metodologie di Machine Learning e […]

Magnetic activity nesting on the Sun and low-mass stars: Results from nearly continuous monitoring of solar active nests with ESA’s Solar Orbiter

Sede A. Riccò Via Santa Sofia 78, Catania

The magnetic activity of low-mass stars, driven by the interplay of convection and rotation in their interiors, is fundamental to their evolution and significantly affects the search for habitable exoplanets. Magnetic activity manifests at the surface as "spots" (or active regions) that influence the circumstellar environment through energetic radiation and eruptive events (flares and coronal mass-ejections, collectively termed “space weather”). The Sun exhibits a well-known 11-year activity cycle where spot emergence drifts from mid to low latitudes. However, one puzzling feature of the solar dynamo is the repeated emergence of spots in close proximity, which leads to long-lived sources of magnetic activity known as active nests. Nesting is observed on other low-mass stars, suggesting it is an innate, universal feature of stellar dynamos. It is theorized that non-axisymmetries in the generation and storage of the magnetic field preference the emergence of spots at specific latitudes and longitudes, leading to nesting. This phenomenon has consequences for predicting space weather near Earth and understanding the secular evolution of exoplanetary atmospheres. Studies of solar active nests have been limited by our single viewpoint from Earth. But with ESA’s Solar Orbiter now monitoring the Sun's far-side for several months each year, multi-viewpoint observations provide a pathway to study the formation and evolution of active nests. So far we have identified an active nest in 2022 that was responsible for 50–70% of all solar flares across the entire solar surface over five months (a prolific flare factory). In addition, we saw a dramatic intensification of solar flare activity in 2024 following the collision of two active nests. These continuous, multi-viewpoint observations strengthen the connection between solar activity and the nesting observed on other low-mass stars, a link that will be further explored with ESA’s PLATO mission.

Inferring past accretion bursts from asteroseismic imprints

Sede A. Riccò Via Santa Sofia 78, Catania

Stars form during the collapse of dense molecular cloud cores. However, most of their final mass comes from the ensuing protostellar disk, owing to non-zero angular momentum in the cloud. Here, the protostar gains up to 50% of its final mass in episodic bursts of mass accretion, while having quiescent phases between the bursts. In this presentation I present a study of how the occurrence of such bursts may be inferred using asteroseismology - the study of stellar pulsations. Specifically, I show how these intense episodes leave a detectable asteroseismic imprint in the deep stellar interior.

L’Office of Astronomy for Education Center Italy: che cosa è, che cosa fa e perché lo fa in quel modo.

Sede A. Riccò Via Santa Sofia 78, Catania

Fondato nel marzo 2021, l’Office of Astronomy for Education Center Italy (I-OAE) è un ufficio internazionale della IAU, coordinato e finanziato da INAF. I-OAE promuove e sostiene pratiche di insegnamento innovativo, centrato sulla persona, e di corsi di formazione docenti.
Nei suoi primi anni di esistenza, I-OAE ha sviluppato processi collaborativi, a cui hanno partecipato rappresentanti di Albania, Cipro, Croazia, Egitto, Francia, Grecia, Israele, Italia, Marocco, Montenegro, Palestina, Portogallo, Slovenia, Siria, Spagna e Turchia. Non solo il network è costante crescita, ma si sta dimostrando anche di attrarre fondi europei.
I-OAE coordina anche l’edizione internazionale di astroEDU, la piattaforma di attività didattiche peer-reviewed della IAU.
I-OAE è un ufficio aperto alla collaborazione di volontari che ne condividano valori e metodi.

The EWOCS view of supermassive stellar clusters

Sede A. Riccò Via Santa Sofia 78, Catania

Star formation in our Galaxy typically occurs in environments less massive than 10^4 solar masses. However, a few more extreme star forming environments on the Milky Way exist, where hundreds of thousands to millions of stars form in dense regions. Often called “supermassive star clusters”, they are rare in our Galaxy today, while they are common in galaxies experiencing epochs of starburst. The international project EWOCS (Extendend Westerlund 1 and 2 Open Clusters Survey) is targeting the two closest superstar clusters in the Milky Way with a multi-wavelengtht survey which is based on an extensive set of data from radio to X-rays, with the main objective of studying the formation and early evolution of stars over the whole mass spectrum in a starburst environment.
In this talk, I will discuss the motivations and objectives of the project, the published results, ongoing studies and the future developments.