A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor

Peter C.B. Smith; Michael R. Line; Jacob L. Bean; Matteo Brogi; Prune August; Luis Welbanks; Jean Michel Desert; Jonathan Lunine; Jorge Sanchez; Megan Mansfield; Lorenzo Pino; Emily Rauscher; Eliza Kempton; Joseph Zalesky; Martin Fowler

doi:10.3847/1538-3881/ad17bf

A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor

Peter C.B. Smith, Michael R. Line, Jacob L. Bean, Matteo Brogi, Prune August, Luis Welbanks, Jean Michel Desert, Jonathan Lunine, Jorge Sanchez, Megan Mansfield, Lorenzo Pino, Emily Rauscher, Eliza Kempton, Joseph Zalesky, Martin Fowler

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Abstract

Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combined JWST NIRSpec/G395H secondary eclipse spectra and Gemini South/IGRINS pre- and post-eclipse thermal emission observations of the hot Jupiter WASP-77A b. Our inferences from the IGRINS and NIRSpec data sets are consistent with each other, and combining the two allows us to measure the gas abundances of H₂O and CO, as well as the vertical thermal structure, with higher precision than either data set provided individually.

Original language	English
Article number	110
Journal	Astronomical Journal
Volume	167
Issue number	3
Number of pages	24
ISSN	0004-6256
DOIs	https://doi.org/10.3847/1538-3881/ad17bf
Publication status	Published - 2024

Keywords

Exoplanets
Exoplanet astronomy
Extrasolar gaseous planets
Hot Jupiters
Exoplanet atmospheres
Exoplanet atmospheric composition
Spectroscopy
High resolution spectroscopy

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Smith, P. C. B., Line, M. R., Bean, J. L., Brogi, M., August, P., Welbanks, L., Desert, J. M., Lunine, J., Sanchez, J., Mansfield, M., Pino, L., Rauscher, E., Kempton, E., Zalesky, J., & Fowler, M. (2024). A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor. Astronomical Journal, 167(3), Article 110. https://doi.org/10.3847/1538-3881/ad17bf

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title = "A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor",

abstract = "Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combined JWST NIRSpec/G395H secondary eclipse spectra and Gemini South/IGRINS pre- and post-eclipse thermal emission observations of the hot Jupiter WASP-77A b. Our inferences from the IGRINS and NIRSpec data sets are consistent with each other, and combining the two allows us to measure the gas abundances of H2O and CO, as well as the vertical thermal structure, with higher precision than either data set provided individually. ",

keywords = "Exoplanets, Exoplanet astronomy, Extrasolar gaseous planets, Hot Jupiters, Exoplanet atmospheres, Exoplanet atmospheric composition, Spectroscopy, High resolution spectroscopy",

author = "Smith, {Peter C.B.} and Line, {Michael R.} and Bean, {Jacob L.} and Matteo Brogi and Prune August and Luis Welbanks and Desert, {Jean Michel} and Jonathan Lunine and Jorge Sanchez and Megan Mansfield and Lorenzo Pino and Emily Rauscher and Eliza Kempton and Joseph Zalesky and Martin Fowler",

note = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",

year = "2024",

doi = "10.3847/1538-3881/ad17bf",

language = "English",

volume = "167",

journal = "Astronomical Journal",

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Smith, PCB, Line, MR, Bean, JL, Brogi, M, August, P, Welbanks, L, Desert, JM, Lunine, J, Sanchez, J, Mansfield, M, Pino, L, Rauscher, E, Kempton, E, Zalesky, J & Fowler, M 2024, 'A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor', Astronomical Journal, vol. 167, no. 3, 110. https://doi.org/10.3847/1538-3881/ad17bf

TY - JOUR

T1 - A Combined Ground-based and JWST Atmospheric Retrieval Analysis

T2 - Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor

AU - Smith, Peter C.B.

AU - Line, Michael R.

AU - Bean, Jacob L.

AU - Brogi, Matteo

AU - August, Prune

AU - Welbanks, Luis

AU - Desert, Jean Michel

AU - Lunine, Jonathan

AU - Sanchez, Jorge

AU - Mansfield, Megan

AU - Pino, Lorenzo

AU - Rauscher, Emily

AU - Kempton, Eliza

AU - Zalesky, Joseph

AU - Fowler, Martin

PY - 2024

Y1 - 2024

N2 - Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combined JWST NIRSpec/G395H secondary eclipse spectra and Gemini South/IGRINS pre- and post-eclipse thermal emission observations of the hot Jupiter WASP-77A b. Our inferences from the IGRINS and NIRSpec data sets are consistent with each other, and combining the two allows us to measure the gas abundances of H2O and CO, as well as the vertical thermal structure, with higher precision than either data set provided individually.

AB - Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combined JWST NIRSpec/G395H secondary eclipse spectra and Gemini South/IGRINS pre- and post-eclipse thermal emission observations of the hot Jupiter WASP-77A b. Our inferences from the IGRINS and NIRSpec data sets are consistent with each other, and combining the two allows us to measure the gas abundances of H2O and CO, as well as the vertical thermal structure, with higher precision than either data set provided individually.

KW - Exoplanets

KW - Exoplanet astronomy

KW - Extrasolar gaseous planets

KW - Hot Jupiters

KW - Exoplanet atmospheres

KW - Exoplanet atmospheric composition

KW - Spectroscopy

KW - High resolution spectroscopy

U2 - 10.3847/1538-3881/ad17bf

DO - 10.3847/1538-3881/ad17bf

M3 - Journal article

AN - SCOPUS:85185458659

SN - 0004-6256

VL - 167

JO - Astronomical Journal

JF - Astronomical Journal

IS - 3

M1 - 110

ER -

A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor

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