Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings

[2412.17072] Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Astrophysics > Earth and Planetary Astrophysics arXiv:2412.17072 (astro-ph) [Submitted on 22 Dec 2024] Title: Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings Authors: Marylou Fournier-Tondreau , Yanbo Pan , Kim Morel , David Lafrenière , Ryan J. MacDonald , Louis-Philippe Coulombe , Romain Allart , Loïc Albert , Michael Radica , Caroline Piaulet-Ghorayeb , Pierre-Alexis Roy , Stefan Pelletier , Lisa Dang , René Doyon , Björn Benneke , Nicolas B. Cowan , Antoine Darveau-Bernier , Olivia Lim , Étienne Artigau , Doug Johnstone , Lisa Kaltenegger , Jake Taylor , Laura Flagg View a PDF of the paper titled Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings, by Marylou Fournier-Tondreau and 22 other authors View PDF HTML (experimental) Abstract: In the era of exoplanet studies with JWST, the transiting, hot gas giant WASP-52 b provides an excellent target for atmospheric characterization through transit spectroscopy. WASP-52 b orbits an active K-type dwarf recognized for its surface heterogeneities, such as star-spots and faculae, which offers challenges to atmospheric characterization via transmission spectroscopy. Previous transit observations have detected active regions on WASP-52 through crossing events in transit light-curves and via the spectral imprint of unocculted magnetic regions on transmission spectra. Here, we present the first JWST observations of WASP-52 b. Our JWST NIRISS/SOSS transit observation, obtained through the GTO 1201 Program, detects two clear spot-crossing events that deform the 0.6-2.8 $\mu$m transit light-curves of WASP-52 b. We find that these two occulted spots combined cover about 2.4 % of the stellar surface and have temperatures about 400-500 K colder than the stellar photosphere. Our NIRISS/SOSS transmission spectrum is best-fit by an atmosphere with H$_2$O (10.8 $\sigma$), He (7.3 $\sigma$, with evidence of an escaping tail at $\sim$ 2.9 $\sigma$), hints of K (2.5 $\sigma$), and unocculted star-spots and faculae (3.6 $\sigma$). The retrieved H$_2$O abundance ($\log$ H$_2$O $\approx -4 \pm 1$) is consistent with a subsolar or solar atmospheric metallicity for two independent data reductions. Our results underscore the importance of simultaneously modelling planetary atmospheres and unocculted stellar heterogeneities when interpreting transmission spectra of planets orbiting active stars and demonstrate the necessity of considering different stellar contamination models that account for both cold and hot active regions. Comments: Submitted to MNRAS; 17 pages, 11 figures and 3 tables Subjects: Earth and Planetary Astrophysics (astro-ph.EP) Cite as: arXiv:2412.17072 [astro-ph.EP] (or arXiv:2412.17072v1 [astro-ph.EP] for this version) https://doi.org/10.48550/arXiv.2412.17072 Focus to learn more arXiv-issued DOI via DataCite Journal reference: MNRAS 539 (2025) 422-438 Related DOI : https://doi.org/10.1093/mnras/staf489 Focus to learn more DOI(s) linking to related resources Submission history From: Marylou Fournier-Tondreau [ view email ] [v1] Sun, 22 Dec 2024 15:51:50 UTC (4,909 KB) Full-text links: Access Paper: View a PDF of the paper titled Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings, by Marylou Fournier-Tondreau and 22 other authors View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.EP < prev | next > new | recent | 2024-12 Change to browse by: astro-ph References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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