e-Article
The PEPSI Exoplanet Transit Survey. III: The detection of FeI, CrI and TiI in the atmosphere of MASCARA-1 b through high-resolution emission spectroscopy
Document Type
Working Paper
Author
Scandariato, G.; Borsa, F.; Bonomo, A. S.; Gaudi, B. S.; Henning, Th.; Ilyin, I.; Johnson, M. C.; Malavolta, L.; Mallonn, M.; Molaverdikhani, K.; Nascimbeni, V.; Patience, J.; Pino, L.; Poppenhaeger, K.; Schlawin, E.; Shkolnik, E. L.; Sicilia, D.; Sozzetti, A.; Strassmeier, K. G.; Veillet, C.; Wang, J.; Yan, F.
Source
A&A 674, A58 (2023)
Subject
Language
Abstract
Hot giant planets like MASCARA-1 b are expected to have thermally inverted atmospheres, that makes them perfect laboratory for the atmospheric characterization through high-resolution spectroscopy. Nonetheless, previous attempts of detecting the atmosphere of MASCARA-1 b in transmission have led to negative results. In this paper we aim at the detection of the optical emission spectrum of MASCARA-1 b. We used the high-resolution spectrograph PEPSI to observe MASCARA-1 (spectral type A8) near the secondary eclipse of the planet. We cross-correlated the spectra with synthetic templates computed for several atomic and molecular species. We obtained the detection of FeI, CrI and TiI in the atmosphere of MASCARA-1 b with a S/N ~7, 4 and 5 respectively, and confirmed the expected systemic velocity of ~13 km/s and the radial velocity semi-amplitude of MASCARA-1 b of ~200 km/s. The detection of Ti is of particular importance in the context of the recently proposed Ti cold-trapping below a certain planetary equilibrium temperature. We confirm the presence of an the atmosphere around MASCARA-1 b through emission spectroscopy. We conclude that the atmospheric non detection in transmission spectroscopy is due to the high gravity of the planet and/or to the overlap between the planetary track and its Doppler shadow.