Calendar

Mag
8
mer
Riunione PRIN 2022 operativa
Mag 8@11:30–13:30
Seminario: Andrea Bonfanti (Austrian Academy of Sciences, Graz, Austria)
Mag 8@15:00–16:30

Speaker: Andrea Bonfanti (Austrian Academy of Sciences, Graz, Austria)
Title: Insights into the M-dwarf radius and density valley
Abstract
M dwarfs are quite attractive in the domain of exoplanetology: Because of their low mass and small
radius, it is easier to detect low-mass planets with the transit method and the radial velocity (RV)
technique. In addition, it is more likely that the hosted planets are within the so-called habitable
zone (HZ). In fact, the HZ around M dwarfs is located closer to the host star than in stars of earlier
spectral type, and it is well known that both the transit method and the RV technique preferentially
detect close-in planets.
The first part of my talk will focus on the case of TOI-732, an M dwarf orbited by an ultra-short
period super-Earth and an outer mini-Neptune likely rich in volatiles. I will specifically show you
the full characterisation of the system with the determination of the stellar parameters followed by a
MCMC joint analysis of ground- and space-based lightcurves and RV time series. In particular, the
analysed dataset contain CHEOPS, TESS, and MAROON-X observations, among others.
TOI-732 is an interesting system also because its planets are located on the two opposite sides of
the so called radius valley. The nature of the radius valley has been deeply investigated in the
literature by mainly focusing on FGK stars, while only a few works specifically drew attention to
low-mass stars. These considerations open the second part of my talk, where I will compare both
evolution and formation mechanisms in shaping the M-dwarf radius valley. By complementing the
results of TOI-732 with literature data of well characterised M-dwarf exoplanets, I will explore the
topology of both the radius and the density valleys using a support vector machine procedure. I will
show you that the formation likely shapes the radius and density gaps more strongly than the
evolution mechanisms.

Mag
9
gio
Riunione Spinelli
Mag 9@21:30–22:30
Mag
14
mar
Seminario: Dominique Meyer (Institute of Space Sciences ICE, CSIC, Campus UAB, Barcelona, Spain)
Mag 14@15:00–16:30

Speaker Dominique Meyer (Institute of Space Sciences ICE, CSIC, Campus UAB, Barcelona, Spain)

Titolo: “Supernova remnants of massive stars”

Abstract: Stars more massive than our Sun by at least a factor of ten are rare but seminal objects in galaxies such our Milky Way. Their powerful radiation, stellar winds, and explosive deaths are dominant engines driving the cycle of matter in the interstellar medium by ionizing and chemically enriching it, inducing turbulence, and producing cosmic rays. The direct surroundings of massive stars (circumstellar medium) appear as gaseous nebulae visible accross the electromagnetic spectrum.  The shapes of the nebulae and their physical charcteristics are the important fingerprints of past stellar evolution and the ambient medium properties. However, to understand how massive stars interact with their surrownding during their lives and after their deaths the sophysitacted multi-dimensional magneto-hydrodynamical and radiative transfer numerical simulations are required. In this talk we will take a journey throughout the lives of massive stars, from their infant to defunct evolutionary phases. We will employ some of the most complex numeric models exisiting to date to discover how interstellar medium morphology is sculptured by massive stars and what does it tell us about stellar feedback in galaxies. Particularly, we will present simulations tailored to the surroundings of evolved massive stars like the red supergiant Betelgeuse and Wolf-Rayet stars, to constrain their past evolution. Finally, we will explore what the asymmetries in non-thermal remnants left behind massive stars which died in a supernova explosion, like the Cygnus Loop nebula and pulsar wind nebulae, tell us about stellar lives.

Mag
16
gio
Seminario: F. Mirabello (INAF)
Mag 16@15:00–16:30

Speaker: F. Mirabello  (INAF)
Titolo: Il Cerchio di Ramsden, un prodigio tecnologico
Abstract:  IL CERCHIO DI RAMSDEN, UN PRODIGIO TECNOLOGICO 

Più di 30 anni fa, Paolo Brenni (1954-2021), esperto di strumentazione scientifica di fama internazionale, si recava a Palermo presso l’Osservatorio Astronomico “G. S. Vaiana” per valutare lo stato conservativo del più importante strumento storico dell’Osservatorio, il cerchio astronomico altazimutale realizzato dal costruttore londinese Jesse Ramsden (1735-1800), e gestirne la spedizione a Firenze per un intervento di restauro presso la Fondazione Scienza e Tecnica. Il relatore ha avuto l’onore di collaborare con Brenni in quella circostanza e con questo articolo vuole rendergli un meritato tributo. Presso la Fondazione fiorentina, sotto la supervisione di Brenni, lo strumento fu smontato e ogni parte revisionata e pulita, preservando, ove presente, la lacca protettiva originaria. I due cerchi che costituiscono le parti più complesse dello strumento, ovvero il grande cerchio verticale e il cerchio orizzontale, non furono disassemblati: Brenni, infatti, non ritenne necessario effettuare questo tipo di intervento, sostenendo che scomporre un manufatto assemblato con grande lavoro di aggiustaggio manuale potesse provocare danni irreversibili allo strumento. Nel 1992, lo strumento, tornato a Palermo, fu collocato nella sua sede originaria presso l’Osservatorio Astronomico.

Con questo strumento, padre Giuseppe Piazzi (1746-1826), fondatore e primo direttore dell’Osservatorio Astronomico di Palermo, scoprì nel 1801 il primo asteroide, Cerere Ferdinandea, e svolse le osservazioni per le due edizioni del suo famoso catalogo stellare (pubblicate nel 1803 e nel 1814). Piazzi considerava il cerchio di Ramsden un capolavoro della tecnica. Ancora oggi, dopo più di due secoli, il talento di un costruttore come Ramsden stupisce chiunque. Egli seppe infatti realizzare, con gli strumenti dell’epoca, uno strumento genialmente progettato, inserendo un telescopio in una scala circolare per ottenere una maggiore precisione nelle misurazioni della posizione delle stelle.

In questo seminario verranno presentati dettagli inediti relativi alla tecnica costruttiva, soluzioni che ancora oggi, a distanza di secoli, squarciano l’alone del tempo e rivelano la genialità di Ramsden. Considerando le conoscenze tecnologiche dell’epoca, la sua costruzione fu davvero impegnativa (Ramsden stesso la definì “titanica”).

Interpretando gli indizi presenti sul Cerchio e ripercorrendo la storia della tecnologia del XVIII secolo con i suoi illustri protagonisti, verranno presentati i risultati di un lungo (e ancora non concluso) studio, frutto di ricerche, passione e competenze tecniche del relatore, che cerca di chiarire come Ramsden sia riuscito nella costruzione di uno strumento unico nel suo genere e che ha fornito importanti contributi allo sviluppo dell’astronomia.

Mag
22
mer
RIUNIONE PROCEDURA ACQUISTI OAPA
Mag 22@9:30–10:30
Mag
23
gio
Seminario: Manami Sasaki (Universita’ di Bamberg – Germania)
Mag 23@15:00–16:30

Speaker: Manami Sasaki (Universita’ di Bamberg – Germania)
Titolo: The hot phase of the interstellar medium
Abstract:
The interstellar medium (ISM) is heated and ionized by radiation, by stellar winds, and finally, by supernova explosions of massive stars. Since these processes are often correlated in space and time, they can form large interstellar structures called superbubbles, which are filled with hot thin plasma. Supernova remnants and superbubbles can be studied best in X-rays since the plasma in their interiors is very hot (10^6 − 10^7 K), while particles are also accelerated in the shock waves. I will present recent results of studies of the hot phase of the ISM in the Milky Way and nearby galaxies, in particular in the Magellanic Clouds, and discuss the physics of the hot plasma, the evolution and energetics of supernova remnants and superbubbles, and the implications for the star formation history of the galaxies.

Mag
27
lun
Seminario: Paolo Saracco (INAF)
Mag 27@11:00–12:30

SHARP – A Near-IR Multi-mode Spectrograph Conceived for the Multi-Conjugate Adaptive Optics Module MORFEO@ELT

Abstract:

The world’s largest aperture combined with state-of-the-art Adaptive Optics systems will enable the ELT to capture better data than the JWST in both sharpness and depth. Therefore, the spectrograph intended for the 2nd port of the Multi-Conjugate Adaptive Optics (MCAO) system MORFEO@ELT will be the most powerful instrument of the JWST era, revealing phenomena beyond the reach of others. SHARP (http://sharp.brera.inaf.it) is a near-IR spectrograph designed for the 2nd port of MORFEO@ELT, intended to be submitted in the upcoming ESO instrument call. Composed of a Multi-Object Spectrograph, NEXUS, and a multi-Integral Field Unit, VESPER, SHARP covers the wavelength range to 0.95-2.45 μ. Coupled with MCAO-assisted observations, it delivers unprecedented high angular (~30 mas) and spectral resolution, outperforming NIRSpec@JWST (100 mas). MORFEO-SHARP will allow us to study the nearby and the early Universe in unprecedented detail, resolving the first galaxies and the star forming regions within galaxies far back in cosmic time, and providing spectra of individual nearby young stellar objects. This presentation introduces the scientific rationale behind SHARP, showcasing its features and inviting those interested to join the SHARP team.

Giu
26
mer
COMMISSIONE PROVA ORALE CONCORSO
Giu 26@9:00–13:00
Set
12
gio
Seminario: Ileana Chinnici (INAF)
Set 12@15:00–16:30

Speaker: Ileana Chinnici (INAF)
Titolo: Warning from Mars: il restauro del globo di Marte del Museo della Specola
Abstract: TBD