TY - JOUR
T1 - ATMOSPHERIX
T2 - II- Characterizing exoplanet atmospheres through transmission spectroscopy with SPIRou
AU - Debras, Florian
AU - Klein, Baptiste
AU - Donati, Jean François
AU - Hood, Thea
AU - Moutou, Claire
AU - Carmona, Andres
AU - Charnay, Benjamin
AU - Bézard, Bruno
AU - Fouqué, Pascal
AU - Masson, Adrien
AU - Vinatier, Sandrine
AU - Baruteau, Clément
AU - Boisse, Isabelle
AU - Bonfils, Xavier
AU - Chiavassa, Andrea
AU - Delfosse, Xavier
AU - Hebrard, Guillaume
AU - Leconte, Jérémy
AU - Martioli, Eder
AU - Ould-Elkhim, Merwan
AU - Parmentier, Vivien
AU - Petit, Pascal
AU - Pluriel, William
AU - Selsis, Franck
AU - Teinturier, Lucas
AU - Tremblin, Pascal
AU - Turbet, Martin
AU - Venot, Olivia
AU - Wyttenbach, Aurélien
N1 - Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - In a companion paper, we introduced a publicly available pipeline to characterize exoplanet atmospheres through high-resolution spectroscopy. In this paper, we use this pipeline to study the biases and degeneracies that arise in atmospheric characterization of exoplanets in near-infrared ground-based transmission spectroscopy. We inject synthetic planetary transits into sequences of SPIRou spectra of the well known M dwarf star Gl 15 A, and study the effects of different assumptions on the retrieval. We focus on (i) mass and radius uncertainties, (ii) non-isothermal vertical profiles, and (iii) identification and retrieval of multiple species. We show that the uncertainties on mass and radius should be accounted for in retrievals and that depth-dependent temperature information can be derived from high-resolution transmission spectroscopy data. Finally, we discuss the impact of selecting wavelength orders in the retrieval and the issues that arise when trying to identify a single species in a multispecies atmospheric model. This analysis allows us to understand better the results obtained through transmission spectroscopy and their limitations in preparation to the analysis of actual SPIRou data.
AB - In a companion paper, we introduced a publicly available pipeline to characterize exoplanet atmospheres through high-resolution spectroscopy. In this paper, we use this pipeline to study the biases and degeneracies that arise in atmospheric characterization of exoplanets in near-infrared ground-based transmission spectroscopy. We inject synthetic planetary transits into sequences of SPIRou spectra of the well known M dwarf star Gl 15 A, and study the effects of different assumptions on the retrieval. We focus on (i) mass and radius uncertainties, (ii) non-isothermal vertical profiles, and (iii) identification and retrieval of multiple species. We show that the uncertainties on mass and radius should be accounted for in retrievals and that depth-dependent temperature information can be derived from high-resolution transmission spectroscopy data. Finally, we discuss the impact of selecting wavelength orders in the retrieval and the issues that arise when trying to identify a single species in a multispecies atmospheric model. This analysis allows us to understand better the results obtained through transmission spectroscopy and their limitations in preparation to the analysis of actual SPIRou data.
KW - methods: data analysis
KW - planets
KW - planets and satellites: atmospheres
KW - satellites: gaseous planets
KW - techniques: spectroscopic
U2 - 10.1093/mnras/stad2608
DO - 10.1093/mnras/stad2608
M3 - Article
AN - SCOPUS:85177495550
SN - 0035-8711
VL - 527
SP - 566
EP - 582
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -