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X-ORIGINAL-URL:https://www.oact.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astrofisico di Catania
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260122T110000
DTEND;TZID=UTC:20260122T120000
DTSTAMP:20260417T051910
CREATED:20260115T110917Z
LAST-MODIFIED:20260120T171121Z
UID:19332-1769079600-1769083200@www.oact.inaf.it
SUMMARY:Magnetic activity nesting on the Sun and low-mass stars: Results from nearly continuous monitoring of solar active nests with ESA’s Solar Orbiter
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Thursday\, January 22\, 11:30 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Adam Finley (ESA Noordwijk) \nABSTRACT: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. \n  \nA few rules:— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/magnetic-activity-nesting-on-the-sun-and-low-mass-stars-results-from-nearly-continuous-monitoring-of-solar-active-nests-with-esas-solar-orbiter/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2026/01/Finley_titleslide.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250327T110000
DTEND;TZID=UTC:20250327T120000
DTSTAMP:20260417T051910
CREATED:20250324T093404Z
LAST-MODIFIED:20250324T093407Z
UID:17877-1743073200-1743076800@www.oact.inaf.it
SUMMARY:How is magnetism affecting the properties of solar and stellar acoustic modes?
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Thursday\, March 27\, 11:00 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dr. Eva Panetier (CEA Saclay\, Université Paris Cité) \nABSTRACT:Outside of solar neutrinos\, the only way to directly probing solar and stellar interiors is to use seismic techniques\, i.e. studying the waves propagating inside them. In the case of the Sun\, acoustic waves are excited by turbulent motion in the convective envelope\, and propagate towards the interior\, creating a variety of standing pressure modes (p modes). By investigating how small perturbations influence the modes parameters\, it is possible to probe the structural and dynamical properties of the star such as internal rotation and mixing\, chemical composition\, density\, convection zone depth\, etc. In the stellar case\, asteroseismology allows the inference of the stellar fundamental parameters such as mass\, radius\, and age. Although\, solar p-modes frequency\, amplitude\, and energy vary in relation with the solar magnetic cycle and similar variations were observed for other magnetically active solar-type stars\, such a variability is often overlooked in stellar modelling. In the context of the preparation of the PLATO mission\, whose aim is to characterize Earth-like planets orbiting solar-like stars in part thanks to asteroseismology\, we need to better understand the relation between magnetic variations and modes parameters. In this seminar\, I will focus on the excitation of the solar p modes using the last 28 years of data from the SoHO/GOLF instrument\, with a method gathering a better temporal resolution compared to classical approaches. In this framework\, I was able to perform a statistical study of the energy of the modes. Summing the energy of all studied modes\, I will demonstrate that there is a discrepancy between the observed excitation rate and the expected rate under the hypothesis of excitation driven entirely by turbulent convection. I will discuss the link between this discrepancy and surface magnetism effects such as flares and coronal mass ejection. In conclusion\, I will explain how a better understanding of the relation between the dynamo mechanism and modes properties variation across time would allow us to improve the constraint we have on stellar dynamics and obtained refined stellar fundamental parameters. \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/how-is-magnetism-affecting-the-properties-of-solar-and-stellar-acoustic-modes/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/03/Locandine-eventi-OACT.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20240923T110000
DTEND;TZID=UTC:20240923T120000
DTSTAMP:20260417T051910
CREATED:20240913T081704Z
LAST-MODIFIED:20240913T081707Z
UID:16744-1727089200-1727092800@www.oact.inaf.it
SUMMARY:The Hot Neptune Desert
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, September 23\, 11:00 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dott. Christian Magliano (Università di Napoli Federico II\, Naples\, Italy) \nABSTRACT:The vast majority of close-in planets are either massive hot Jupiters capable of holding their atmosphere against the stellar photoevaporation or small rocky planets completely drained by the stellar radiation. We observe an unexpected dearth of highly irradiated Neptune- and Saturn-like planets orbiting their host star in less than 4-10 days\, called “Hot Neptune Desert”. In this talk\, I will present our recent findings from uniformly vetting 250 hot Neptune TESS candidates using a two-step vetting technique\, as well as discuss a cutting-edge approach to examine the problem under a new perspective. I will also discuss how the PLATO mission may enhance our understanding of the Hot Neptunes. \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/the-hot-neptune-desert/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/09/Locandina_page-0001.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20240514T090000
DTEND;TZID=UTC:20240516T180000
DTSTAMP:20260417T051910
CREATED:20240424T094724Z
LAST-MODIFIED:20240424T094727Z
UID:16168-1715677200-1715882400@www.oact.inaf.it
SUMMARY:ESP2024 - PLATO PLANETARY SYSTEMS: Formation to Observed architectures
DESCRIPTION:PLATO is the 3rd mission of class M in the ESA Cosmic Vision program. Its main goal is detecting terrestrial planets in the habitable zone of  solar type stars. With its huge FOV\, most of the PLATO targets are bright stars that will be monitored with high cadence (25 s) for at least 2-3 years during the long duration observing program\, while contemporary a number of very bright stars in the sample will be observed with 2.5 s cadence. The collected data\, photometry from space and high resolution spectroscopy from the ground\, will provide accurate planetary structures as well as  architectures and evolutionary stage – via asteroseismic analysis – of a large number of planetary systems. PLATO is planned for a launch in Dec 2026. \nMore information on PLATO are on the ESA website and in PLATO Mission Consortium website. \nWith  PLATO Mission due for launch soon  this would seem a good time to review the present state of knowledge of exoplanet systems and the objectives of the mission. PLATO is optimized for the detection and characterization of small planets in the habitable zones of Sun-like stars. By combining two cutting-edge approaches: planetary transits and the study of the internal structure of stars using stellar seismology\, supported by a dedicated ground-based observation programme.In combination with a dedicated ground based observation programme\, PLATO will provide accurate planetary parameters (including age) for a large sample of exoplanets which could be used to answer many scientific questions eg if there are favoured evolutionary paths for exoplanets by comparison with theoretical population models PLATO will provide accurate and complete planetary parameters (including age) for a large sample of exoplanets\, allowing to address a variety of scientific questions: planet occurrences\, trends in composition\, dynamical evolution\, favoured evolutionary paths\, etc. \nThe aim of this conference is to review the current state of the art in the field and to examine the range of scientific questions PLATO data could prove useful. Themed sessions will examine planetary systems at all stages of their evolution as well as give an overview of the PLATO mission\, its  future data\, and how to become involved. \n  \nSESSION THEMES \n1 – PLATO mission – where are we?2 – PLATO Science – From Stars to Planets3 – System architectures from observations4 – Advances in planet formation5 – Exoplanets Evolution6 – Relevant Stellar Science \n\n  \nMore info
URL:https://www.oact.inaf.it/event/esp2024-plato-planetary-systems-formation-to-observed-architectures/
LOCATION:Department of Physics and Astronomy “Ettore Majorana” (DFA) of the Catania University\, Via Santa Sofia 64\, Catania\, 95123\, Italia
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/04/PLATOESP2024_Poster-2.jpg
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