Calendar

Nov
25
ven
Seminario: Gloria Guilluy (INAF-OATo)
Nov 25@11:00–12:30
Stanza Google Meet: https://meet.google.com/sxz-cctp-tsc
Speaker: Gloria Guilluy (INAF-OATo)
Titolo: Exoplanetary Atmospheres with GIANO@TNG.
Abstract: I will present the atmospheric characterization study of hot and warm giant planets using the Telescopio Nazionale Galileo (TNG) in the simultaneous GIARPS (GIANO-B + HARPS-N) observing mode. I will focus in particular on our ongoing efforts to probe both the lower and the upper exoplanetary atmospheres using the near-infrared (0.95-2.45 \mu m) arm of GIARPS: the high-resolution (R /sim 50 000) spectrograph GIANO-B. On the one hand, I will discuss our investigations of the deeper exo-atmospheric layers performed through the search of molecular species (e.g., water, methane, carbon dioxide, hydrogen cyanide) which, by constraining the planet’s C/O ratio, provide clear proxies on planetary formation. On the other hand, I will show our upper exoplanetary atmospheres’ analysis realized through the detection of the individual contributions of atoms (more precisely the metastable helium line at 1083.3 nm). The helium line, in addition to providing key insights into an exoplanetary exosphere, allows for putting constraints on evolutionary processes (i.e. hydrodynamic escape, the mass loss rate, and the morphology of the escaping material).
Nov
30
mer
prova orale concorso tecnologi pos.4
Nov 30@9:00–14:00
Dic
6
mar
Concorso @ concorso
Dic 6 giorno intero
Dic
7
mer
Laboratorio Save the Children
Dic 7@15:00–19:00
Dic
15
gio
Seminario: Ciro Pinto (INAF / IASF-Palermo)
Dic 15@15:00–16:30

Stanza Google Meet: https://meet.google.com/sxz-cctp-tsc

Speaker: Ciro Pinto (INAF / IASF-Palermo)

Titolo: “Fast growth and feedback of black holes accreting beyond the Eddington limit”

Abstract:
The detection of fully-grown supermassive black holes in active galactic nuclei at high redshift, when the Universe was young, challenges the theories of black holes growth, requiring long periods of high accretion, most likely above the Eddington limit. These objects will be difficult to study in detail, even with future advanced observatories. In the nearby Universe there are compact objects with a similar accretion regime that can be used as proxy for primordial black holes. Ultraluminous X-ray sources (ULXs) are mainly nearby stellar-mass black holes and neutron stars accreting above their Eddington limit. This was understood after the discovery of coherent pulsations and cyclotron lines in some ULXs, indicating that at least a fraction of them hosts neutron stars as compact objects and, finally, our discovery of powerful winds as predicted by theoretical models of super-Eddington accretion. ULX winds carry a huge amount of power owing to their mildly relativistic speeds (~0.2c) and are able to significantly affect the surrounding medium, producing the observed 100s pc super bubbles, and limit the amount of matter that can reach the central accretor. The study of ULX winds is therefore quintessential to understand 1) how much and how fast can matter be accreted by black holes and 2) how strong is their feedback onto the surrounding medium in the regime of high accretion rate such as for quasars and supermassive black holes at their peak of growth. I will provide an overview on this phenomenology and discuss how we can use similar techniques onto highly-accreting supermassive black holes to understand their fast growth and feedback onto the host galaxy.

Gen
10
mar
Riunione EXOPA
Gen 10@9:45–12:00
Gen
24
mar
Riunione EXOPA
Gen 24@9:45–12:00
Feb
7
mar
Riunione EXOPA
Feb 7@9:45–12:00
Feb
21
mar
Riunione EXOPA
Feb 21@9:45–12:00