The HUSTLE Program: The UV to Near-Infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b

(10) University of Bristol; (11) University of Michigan; (12) University of California); (2) University of Bristol; (3) University of Arizona; (4) Center for Astrophysics Harvard; 5); (5) Institut d'Estudis Espacials de Catalunya; (6) Space Telescope Science Institute; (7) University of Bristol

The HUSTLE Program: The UV to Near-Infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b

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arxiv 2410.17368 v1 pith:BPWWYA7M submitted 2024-10-22 astro-ph.EP

V. A. Boehm (1) , N. K. Lewis (1) , C. E. Fairman (2) , S. E. Moran (3) , C. Gascón (4 , 5) , H. R. Wakeford (2) , M. K. Alam (6)

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L. Alderson (7) J. Barstow (8) N. E. Batalha (9) D. Grant (10) M. López-Morales (4) R. J. MacDonald (11) M. S. Marley (3) K. Ohno (12) ((1) Cornell University (2) University of Bristol (3) University of Arizona (4) Center for Astrophysics Harvard Smithsonian (5) Institut d'Estudis Espacials de Catalunya (6) Space Telescope Science Institute (7) University of Bristol (8) The Open University (9) NASA Ames Research Center (10) University of Bristol (11) University of Michigan (12) University of California)

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keywords g280uviswfc3observationsprecisionspectrumtransmissionwasp-127b

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Ultraviolet wavelengths offer unique insights into aerosols in exoplanetary atmospheres. However, only a handful of exoplanets have been observed in the ultraviolet to date. Here, we present the ultraviolet-visible transmission spectrum of the inflated hot Jupiter WASP-127b. We observed one transit of WASP-127b with WFC3/UVIS G280 as part of the Hubble Ultraviolet-optical Survey of Transiting Legacy Exoplanets (HUSTLE), obtaining a transmission spectrum from 200-800 nm. Our reductions yielded a broad-band transit depth precision of 91 ppm and a median precision of 240 ppm across 59 spectral channels. Our observations are suggestive of a high-altitude cloud layer with forward modeling showing they are composed of sub-micron particles and retrievals indicating a high opacity patchy cloud. While our UVIS/G280 data only offers weak evidence for Na, adding archival HST WFC3/IR and STIS observations raises the overall Na detection significance to 4.1-sigma. Our work demonstrates the capabilities of HST WFC3/UVIS G280 observations to probe the aerosols and atmospheric composition of transiting hot Jupiters with comparable precision to HST STIS.

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The HUSTLE Program: The UV to Near-IR Transmission Spectrum of the Hot Jupiter KELT-7b
astro-ph.EP 2025-06 conditional novelty 5.0 of 10

The UV-to-IR transmission spectrum of the hot Jupiter KELT-7b requires a H- abundance about seven orders of magnitude above equilibrium chemistry, implying photochemical disequilibrium, and also reveals bright patches...

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