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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:20240101T000000
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DTSTART;TZID=UTC:20240122T110000
DTEND;TZID=UTC:20240122T120000
DTSTAMP:20260405T063008
CREATED:20240109T144134Z
LAST-MODIFIED:20240117T113936Z
UID:15391-1705921200-1705924800@www.oact.inaf.it
SUMMARY:The contribution of laboratory experiments in the study of organic matter in Solar-system bodies
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, January 22\, 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. Riccardo Giovanni Urso (INAF-Osservatorio Astrofisico di Catania) \nABSTRACT:Organic matter is revealed in a variety of extraterrestrial bodies\, including comets\, asteroids\, satellites\, and trans-Neptunian objects. On atmosphere-less surfaces\, organics are detected in the visible and near-infrared thanks to observations performed with the instruments on-board space probes and telescopes. Further information on the properties of organics comes from the analysis of meteorites\, interplanetary dust particles\, and unique samples collected on comets and asteroids during dedicated space missions. \nUnderstanding the properties of organic matter present in small bodies would allow us to shed light on processes that happened at the dawn of the Solar System\, when these objects formed by the aggregation of the materials available in the protoplanetary disk. However\, since their formation\, atmosphere-less surfaces were continuously exposed to energetic photons\, solar particles\, and cosmic rays that cause the alteration of organics\, hindering to draw firm conclusions on their pristine composition and origin. \nWith the aim to support the interpretation of recent remote sensing observations and the analysis of extraterrestrial samples\, we performed laboratory experiments to study the spectral properties of organics revealed in Solar System bodies\, to shed light on the alteration induced by energetic charged particles\, and to suggest possible pathways for the organics’ formation thanks to processes that involved molecular precursors already available in the pre-solar cloud. \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-contribution-of-laboratory-experiments-in-the-study-of-organic-matter-in-solar-system-bodies/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/01/Seminario-OACT-1.2024.jpg
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DTSTART;TZID=UTC:20240130T113000
DTEND;TZID=UTC:20240130T120000
DTSTAMP:20260405T063008
CREATED:20240123T222903Z
LAST-MODIFIED:20240124T084338Z
UID:15478-1706614200-1706616000@www.oact.inaf.it
SUMMARY:RU Lup: the accretion environment of a prototypical Classical T Tauri star
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Tuesday\, January 30\, 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. Antonio Armeni (Tuebingen University) \nABSTRACT: \nWhile it is well established that Classical T Tauri stars accrete material from a circumstellar disk through magnetic fields\, the physics regulating the processes in the inner (0.1 AU) disk is still not well understood. With its long observational history and its rich emission line spectrum\, RU Lup is a prime example to study this environment. \nRU Lup is a monitoring target within the ULLYSES survey for Classical T Tauri stars. Optical spectroscopic observations with CHIRON and ESPRESSO were obtained simultaneously with the two epochs of the ULLYSES monitoring program for RU Lup. \nIn this talk\, I will discuss the main results obtained by analyzing this collection of data\, supplemented by the two TESS observations and the archival AAVSO photometry of RU Lup.Using the high resolution ESPRESSO spectra\, we improved the measurements of the stellar parameters\, especially the projected rotational velocity (vsini).We determined the veiling fraction for the ESPRESSO spectra\, showing that the veiling consists of two components: a continuum emission likely originating in the accretion shock and line emission that fills in the photospheric absorption lines.We detected a periodic modulation in the narrow component (NC) of the He I 5876 line with a period that is compatible with the stellar rotation period\, indicating the presence of a compact region on the stellar surface that we identified as the footprint of the accretion shock. Although the brightness of RU Lup changed drastically both on daily and yearly timescales\, this region is overall stable over the 3 years covered by the observations.An analysis of the high-cadence TESS light curves revealed quasi-periodic oscillations (QPO) on timescales shorter than the stellar rotation period. This suggests that the accretion disk in RU Lup extends inward of the corotation radius and the star accretes through a magnetic boundary layer (MBL). The rich metallic emission line spectrum of RU Lup might be characteristic of this accretion regime. \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/ru-lup-the-accretion-environment-of-a-prototypical-classical-t-tauri-star/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/01/RU_Lup_cover_page-0001.jpg
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