TY - JOUR
T1 - Detection of Carbon Monoxide in the Atmosphere of WASP-39b Applying Standard Cross-correlation Techniques to JWST NIRSpec G395H Data
AU - Esparza-Borges, Emma
AU - López-Morales, Mercedes
AU - Adams Redai, Jéa I.
AU - Pallé, Enric
AU - Kirk, James
AU - Casasayas-Barris, Núria
AU - Batalha, Natasha E.
AU - Rackham, Benjamin V.
AU - Bean, Jacob L.
AU - Casewell, S. L.
AU - Decin, Leen
AU - Dos Santos, Leonardo A.
AU - Muñoz, Antonio García
AU - Harrington, Joseph
AU - Heng, Kevin
AU - Hu, Renyu
AU - Mancini, Luigi
AU - Molaverdikhani, Karan
AU - Morello, Giuseppe
AU - Nikolov, Nikolay K.
AU - Nixon, Matthew C.
AU - Redfield, Seth
AU - Stevenson, Kevin B.
AU - Wakeford, Hannah R.
AU - Alam, Munazza K.
AU - Benneke, Björn
AU - Blecic, Jasmina
AU - Crouzet, Nicolas
AU - Daylan, Tansu
AU - Inglis, Julie
AU - Kreidberg, Laura
AU - Petit dit de la Roche, Dominique J.M.
AU - Turner, Jake D.
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - Carbon monoxide was recently reported in the atmosphere of the hot Jupiter WASP-39b using the NIRSpec PRISM transit observation of this planet, collected as part of the JWST Transiting Exoplanet Community Early Release Science Program. This detection, however, could not be confidently confirmed in the initial analysis of the higher-resolution observations with NIRSpec G395H disperser. Here we confirm the detection of CO in the atmosphere of WASP-39b using the NIRSpec G395H data and cross-correlation techniques. We do this by searching for the CO signal in the unbinned transmission spectrum of the planet between 4.6 and 5.0 μm, where the contribution of CO is expected to be higher than that of other anticipated molecules in the planet’s atmosphere. Our search results in a detection of CO with a cross-correlation function (CCF) significance of 6.6σ when using a template with only 12C16O lines. The CCF significance of the CO signal increases to 7.5σ when including in the template lines from additional CO isotopologues, with the largest contribution being from 13C16O. Our results highlight how cross-correlation techniques can be a powerful tool for unveiling the chemical composition of exoplanetary atmospheres from medium-resolution transmission spectra, including the detection of isotopologues.
AB - Carbon monoxide was recently reported in the atmosphere of the hot Jupiter WASP-39b using the NIRSpec PRISM transit observation of this planet, collected as part of the JWST Transiting Exoplanet Community Early Release Science Program. This detection, however, could not be confidently confirmed in the initial analysis of the higher-resolution observations with NIRSpec G395H disperser. Here we confirm the detection of CO in the atmosphere of WASP-39b using the NIRSpec G395H data and cross-correlation techniques. We do this by searching for the CO signal in the unbinned transmission spectrum of the planet between 4.6 and 5.0 μm, where the contribution of CO is expected to be higher than that of other anticipated molecules in the planet’s atmosphere. Our search results in a detection of CO with a cross-correlation function (CCF) significance of 6.6σ when using a template with only 12C16O lines. The CCF significance of the CO signal increases to 7.5σ when including in the template lines from additional CO isotopologues, with the largest contribution being from 13C16O. Our results highlight how cross-correlation techniques can be a powerful tool for unveiling the chemical composition of exoplanetary atmospheres from medium-resolution transmission spectra, including the detection of isotopologues.
UR - https://www.scopus.com/pages/publications/85173938825
U2 - 10.3847/2041-8213/acf27b
DO - 10.3847/2041-8213/acf27b
M3 - Article
AN - SCOPUS:85173938825
SN - 2041-8205
VL - 955
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L19
ER -