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X-WR-CALNAME:Osservatorio Astrofisico di Catania
X-ORIGINAL-URL:https://www.oact.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astrofisico di Catania
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DTSTART:20230101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20231201T113000
DTEND;TZID=UTC:20231201T123000
DTSTAMP:20260407T063912
CREATED:20231123T111413Z
LAST-MODIFIED:20231130T223527Z
UID:15007-1701430200-1701433800@www.oact.inaf.it
SUMMARY:Astronomical Observations & Optical Communication through Atmospheric Turbulence
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Friday\, December 1\, 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: Dr. Aziz Ziad (Université Côte d’Azur) \nABSTRACT:The atmospheric parameters have a strong impact on the image formation through the atmosphere. Indeed\, the effect of atmospheric turbulence on wavefronts reduces severely the resolution of ground-based astronomical observations. Thus\, in the context of astronomical observations\, the site-selection has now become essential with the advent of the next generation of Extremely Large Telescopes (ELT). Indeed\, it is important to choose sites with reduced cloud coverage\, weak turbulence and low aerosol distribution in order to enhance observations time and to improve their scientific performance. It is also important to remember that the choice of sites hosting astronomical projects must meet very strict criteria in terms of optical quality. Future optical communications and telemetry stations will be forced to meet the same requirements. \nBeyond Site-Testing and Site-Selection for Astronomical Observations or Optical Communications\, precise knowledge of atmospheric turbulence parameters is of interest for the technical specifications of the Adaptive Optics (AO) systems dedicated to real-time correction of the atmospheric turbulence. In addition\, the CN2(h) profiles (as well as wind and outer scale profiles) with high vertical resolution is necessary for a better evaluation of the performance of AO systems. A large number of monitors have been developed for this purpose\, particularly with the emergence of ELT projects\, but very few meet the required need. Recently\, a new station has been developed in the framework of a European consortium and a contract with the European Space Agency (ESA). This ANAtOLIA station is a compact mobile high-performance station\, equipped with the most performing instruments leading to the whole atmospheric parameters. \nANATOLIA is a ESA funded project aimed to study\, among other topics\, the  effects of aerosols and atmospheric turbulence on optical communication. Master students in Physics\, Engineering\, Geology are solicited to attend if interested to conduct research on (one/more) topic(s) in optical communication (internship and PhD level). \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/astronomical-observations-optical-communication-through-atmospheric-turbulence/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2023/11/seminario_Aziz_Ziad.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20231206T113000
DTEND;TZID=UTC:20231206T123000
DTSTAMP:20260407T063912
CREATED:20231130T090026Z
LAST-MODIFIED:20231205T183935Z
UID:15074-1701862200-1701865800@www.oact.inaf.it
SUMMARY:Space-Weathering on Primitive Asteroids
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Wednesday\, December 6\, 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: Dr. Stefano Rubino (INAF-IAPS) \nABSTRACT:Studying small bodies in our solar system is fundamental for understanding its youth and evolution. These small “primitive” bodies are “undifferentiated” (they did not undergo phase density separation\, irreversibly altering their mineralogy). They have evolved little since their creation\, spurring a composition relatively close to the primordial proto-planetary disk. However\, other processes\, such as thermal alteration\, aqueous alteration\, shocks\, or space-weathering\, can affect these bodies’ surfaces. This issue is because remote-sensed data acquired while studying these bodies target these surfaces. If these surfaces have been altered\, they can induce a particular bias in the study of the composition of these small bodies. Therefore\, it is paramount to understand the processes affecting the surface of primitive asteroids to assess their composition correctly.There are several ways to study the surface of primitive asteroids\, such as remotely\, from the Earth or a satellite orbiting the body of interest\, by acquiring spectroscopic data (gaining access to surface chemical and mineralogical composition). It is also possible to study these bodies in a laboratory environment by working on analogous materials\, such as certain classes of “primitive” meteorites (carbonaceous chondrites)\, on terrestrial analogs (simpler to study than meteorites but less closely related to extraterrestrial materials)\, or directly on extraterrestrial materials brought back by sample return missions.In this work\, we replicate the effects of space weathering (SpWe) on the surface of primitive asteroids in a laboratory environment. More specifically\, we focus on the effects of solar wind\, the dominant SpWe process on “young” surfaces of the solar system. We have chosen three terrestrial minerals analogous to a “primitive” surface – three hydrated minerals (two serpentines and one saponite) – of which we have produced several pellets which have been bombarded using He and Ar ions\, to investigate the effects of two different solar wind. In doing so\, we made analogous materials of weathered primitive surface matter.These analogs were then characterized by infrared spectroscopy\, from the visible to the far-infrared range\, to study chemical changes prompted by ion bombardment. This was done by investigating how certain spectroscopic features – characteristic of hydrated silicates – changed upon ion bombardment. We detected several effects\, such as darkening in the visible range\, visible slope reddening and bluing\, and a systematic shift towards longer wavelength affecting the position of several spectroscopic features.This spectroscopic characterization was followed by a study at a smaller scale using electron microscopy. We first characterized the surface of our weathered analogs using scanning electron microscopy. Then\, we investigated the morphological and physicochemical changes in the bombarded layer\, at a nanometer scale using transmission electron microscopy. Strong vesiculation effects of various kinds were identified in the ion-bombarded amorphized layers\, textural changes\, and some elemental concentration evolution (such as the loss of oxygen in the utmost top surfaces\, preferential amorphization of magnesium\, etc.). The coupling between these two techniques\, IR spectroscopy\, and electron microscopy acting at different scales\, has allowed for a better understanding of SpWe effects on primitive bodies and will be able to support current and future studies of primitive bodies\, whether they are carried out remotely or in a laboratory environment on returned samples. \n  \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/space-weathering-on-primitive-asteroids/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2023/11/Rubino_locandina_6.12.23jpg.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20231218T113000
DTEND;TZID=UTC:20231218T123000
DTSTAMP:20260407T063912
CREATED:20231207T152850Z
LAST-MODIFIED:20231207T153032Z
UID:15146-1702899000-1702902600@www.oact.inaf.it
SUMMARY:The Gravitational-Wave breakthrough we can('t) wait for
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, December 18\, 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: Dr. Gianluca Pagliaro (Max Planck Institute for Gravitational Physics\, AEI Hannover) \nABSTRACT:Less than a decade after the first historical Gravitational Wave (GW) detection GW150914\, the field of GW astronomy has grown at a phenomenal pace\, going from less than an event per month\, to the currently observed rate of few events a week.Despite the exceptional contributions the field has brought to fundamental physics\, astronomy\, cosmology\, computational physics as well as the unavoidable collateral progress in fields related to the experimental development of GW detectors\, the picture is anything but complete.Amongst the missing pieces of the puzzle we find Continuous Gravitational Waves (CGWs). In this seminar I am going to talk about CGWs\, what are they and what astrophysical sources and mechanisms can produce them\, with a particular focus on non-axisymmetric spinning Neutron Stars. I will also briefly discuss the different search implementations\, what is done\, or can be done\, to increase our chances to arrive to what is probably going to be the next breakthrough in GW Astronomy\, the first CGW detection\, including a discussion about prospects in view of future observation runs as well as GW detectors operational in the close future. \n  \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-gravitational-wave-breakthrough-we-cant-wait-for/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2023/12/seminar_catania_cover_2_page-0001.jpg
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