Relatore
Descrizione
High-resolution spectroscopy has evolved over the past decade into a key technique for exoplanet atmospheric characterization, enabling detailed constraints on chemical composition, thermal structure, and atmospheric dynamics. Ultra-Hot Jupiters (UHJs), with their extreme irradiation and temperatures, offer unique laboratories for exploring atmospheric physics under conditions far beyond those found in the Solar System.
In this talk, I will present a new analysis of the hottest known UHJ, KELT‑9b (equilibrium temperature ~4000 K), observed in transmission with the GIARPS facility at the Telescopio Nazionale Galileo, combining simultaneous near‑infrared (GIANO‑B) and optical (HARPS‑N) spectroscopy. Through this case study, I will illustrate how high‑resolution observations are increasingly sensitive to both the underlying thermochemical assumptions, such as the choice between LTE and NLTE treatments, and the inherently three‑dimensional nature of UHJ atmospheres. Features such as strong day-night temperature contrasts, vertical thermal gradients, and high‑velocity winds can imprint detectable signatures on the spectra, influencing both the strength and interpretation of atmospheric signals.
These results highlight the broader need for atmospheric frameworks that jointly account for realistic chemistry, radiative processes, and multidimensional dynamics when interpreting high‑resolution datasets. Looking ahead, next‑generation instruments such as ANDES at the ELT will provide the sensitivity required to probe complex 3D atmospheric processes, chemical stratification, and dynamical regimes with unprecedented detail.
| Sessione | Pianeti extrasolari e astrobiologia |
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