TY - JOUR
T1 - High-resolution dayside spectroscopy of WASP-189 b: detection of iron during the GHOST/Gemini South System Verification Run
AU - Deibert, Emily K.
AU - Langeveld, Adam B.
AU - Young, Mitchell E.
AU - Flagg, Laura
AU - Turner, Jake D.
AU - Smith, Peter C. B.
AU - de Mooij, Ernst J. W.
AU - Jayawardhana, Ray
AU - Chiboucas, Kristin
AU - Gamen, Roberto
AU - Hayes, Christian R.
AU - Heo, Jeong-Eun
AU - Jeong, Miji
AU - Kalari, Venu
AU - Martioli, Eder
AU - Placco, Vinicius M.
AU - Xu, Siyi
AU - Diaz, Ruben
AU - Gomez-Jimenez, Manuel
AU - Quiroz, Carlos
AU - Ruiz-Carmona, Roque
AU - Simpson, Chris
AU - McConnachie, Alan W.
AU - Pazder, John
AU - Burley, Gregory
AU - Ireland, Michael
AU - Waller, Fletcher
AU - Berg, Trystyn A. M.
AU - Robertson, J. Gordon
AU - Jones, David O.
AU - Labrie, Kathleen
AU - Ridgway, Susan
AU - Thomas-Osip, Joanna
PY - 2024/10/1
Y1 - 2024/10/1
N2 - With high equilibrium temperatures and tidally locked rotation, ultra-hot Jupiters (UHJs) are unique laboratories within which to probe extreme atmospheric physics and chemistry. In this paper, we present high-resolution dayside spectroscopy of the UHJ WASP-189 b obtained with the new Gemini High-resolution Optical SpecTrograph (GHOST) at the Gemini South Observatory. The observations, which cover 3 hr of post-eclipse orbital phases, were obtained during the instrument’s System Verification run. We detect the planet’s atmosphere via the Doppler cross-correlation technique, and recover a detection of neutral iron in the planet’s dayside atmosphere at a significance of 7.5σ in the red arm of the data, verifying the presence of a thermal inversion. We also investigate the presence of other species in the atmosphere and discuss the implications of model injection/recovery tests. These results represent the first atmospheric characterization of an exoplanet with GHOST’s high-resolution mode, and demonstrate the potential of this new instrument in detecting and studying ultra-hot exoplanet atmospheres.
AB - With high equilibrium temperatures and tidally locked rotation, ultra-hot Jupiters (UHJs) are unique laboratories within which to probe extreme atmospheric physics and chemistry. In this paper, we present high-resolution dayside spectroscopy of the UHJ WASP-189 b obtained with the new Gemini High-resolution Optical SpecTrograph (GHOST) at the Gemini South Observatory. The observations, which cover 3 hr of post-eclipse orbital phases, were obtained during the instrument’s System Verification run. We detect the planet’s atmosphere via the Doppler cross-correlation technique, and recover a detection of neutral iron in the planet’s dayside atmosphere at a significance of 7.5σ in the red arm of the data, verifying the presence of a thermal inversion. We also investigate the presence of other species in the atmosphere and discuss the implications of model injection/recovery tests. These results represent the first atmospheric characterization of an exoplanet with GHOST’s high-resolution mode, and demonstrate the potential of this new instrument in detecting and studying ultra-hot exoplanet atmospheres.
KW - Exoplanet atmospheric composition
KW - Hot Jupiters
KW - Exoplanet atmospheres
KW - High resolution spectroscopy
U2 - 10.3847/1538-3881/ad643f
DO - 10.3847/1538-3881/ad643f
M3 - Article
SN - 0004-6256
VL - 168
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
M1 - 148
ER -