Kolokium Daring KK & Prodi Astronomi
2 Juli 2020, 16.00 WIB
Unveiling the Atmosphere of Hot Jupiters using High-resolution Spectroscopy
Pembicara: Dr. Stevanus Kristianto Nugroho
Queen’s University Belfast, UK
Kami mengundang seluruh peminat kolokium untuk dapat bergabung melalui tautan:
Atas perhatian dan partisipasi aktifnya, kami sampaikan terima kasih.
Dr. Kiki Vierdayanti
Using high-resolution spectroscopy, the molecular bands in the spectrum of exoplanet atmosphere are resolved into individual absorption/emission lines. The variation of Doppler shifts caused by its orbital motion enables absorption/emission lines in the exoplanet spectrum to be distinguished from telluric lines and ensures the unambiguous detection of specific molecules (H2O, CO, TiO, Na I, K I, Fe I, Fe II). This technique has become one of the most robust approaches in the attempt to characterise the exoplanet atmosphere. Using this, we detected the first unambiguous signature of TiO emission in the dayside of WASP-33b. Since then, we have extended our research to colder hot Jupiters to find out if TiO is common in the atmosphere of extremely hot Jupiters or if there are other possible thermal inversion agents. Here, we share our latest findings. I will present our recent results in detecting Fe I in the atmosphere of several hot Jupiters which suggest that it is common in the atmosphere of hot Jupiters and could be the main caused for temperature inversion (stratosphere) in this planet regime. Then, I will also present the current state of the art techniques in characterising exoplanet which can potentially be applied to a 4 m class telescope, e.g. Timau National Observatory, or smaller.