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

V. A. Boehm; N. K. Lewis; C. E. Fairman; S. E. Moran; C. Gascón; H. R. Wakeford; M. K. Alam; L. Alderson; J. Barstow; N. E. Batalha; D. Grant; M. López-Morales; R. J. MacDonald; Mark S. Marley; K. Ohno

doi:10.3847/1538-3881/ad8dde

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

V. A. Boehm, N. K. Lewis, C. E. Fairman, S. E. Moran, C. Gascón, H. R. Wakeford, M. K. Alam, L. Alderson, J. Barstow, N. E. Batalha, D. Grant, M. López-Morales, R. J. MacDonald, Mark S. Marley, K. Ohno

Planetary Sciences

Research output: Contribution to journal › Article › peer-review

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Abstract

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, obtaining a transmission spectrum from 200 to 800 nm. Our reductions yielded a broadband 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 submicron particles and retrievals indicating a high-opacity patchy cloud. While our UVIS/G280 data only offer weak evidence for Na, adding archival Hubble Space Telescope (HST) WFC3/IR and STIS observations raises the overall Na detection significance to 4.1σ. 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.

Original language	English (US)
Article number	23
Journal	Astronomical Journal
Volume	169
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/ad8dde
State	Published - Jan 1 2025

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Boehm, V. A., Lewis, N. K., Fairman, C. E., Moran, S. E., Gascón, C., Wakeford, H. R., Alam, M. K., Alderson, L., Barstow, J., Batalha, N. E., Grant, D., López-Morales, M., MacDonald, R. J., Marley, M. S., & Ohno, K. (2025). The HUSTLE Program: The UV to Near-infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b. Astronomical Journal, 169(1), Article 23. https://doi.org/10.3847/1538-3881/ad8dde

Boehm, VA, Lewis, NK, Fairman, CE, Moran, SE, Gascón, C, Wakeford, HR, Alam, MK, Alderson, L, Barstow, J, Batalha, NE, Grant, D, López-Morales, M, MacDonald, RJ, Marley, MS & Ohno, K 2025, 'The HUSTLE Program: The UV to Near-infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b', Astronomical Journal, vol. 169, no. 1, 23. https://doi.org/10.3847/1538-3881/ad8dde

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abstract = "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, obtaining a transmission spectrum from 200 to 800 nm. Our reductions yielded a broadband 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 submicron particles and retrievals indicating a high-opacity patchy cloud. While our UVIS/G280 data only offer weak evidence for Na, adding archival Hubble Space Telescope (HST) WFC3/IR and STIS observations raises the overall Na detection significance to 4.1σ. 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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AU - Boehm, V. A.

AU - Lewis, N. K.

AU - Fairman, C. E.

AU - Moran, S. E.

AU - Gascón, C.

AU - Wakeford, H. R.

AU - Alam, M. K.

AU - Alderson, L.

AU - Barstow, J.

AU - Batalha, N. E.

AU - Grant, D.

AU - López-Morales, M.

AU - MacDonald, R. J.

AU - Marley, Mark S.

AU - Ohno, K.

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Y1 - 2025/1/1

N2 - 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, obtaining a transmission spectrum from 200 to 800 nm. Our reductions yielded a broadband 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 submicron particles and retrievals indicating a high-opacity patchy cloud. While our UVIS/G280 data only offer weak evidence for Na, adding archival Hubble Space Telescope (HST) WFC3/IR and STIS observations raises the overall Na detection significance to 4.1σ. 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.

AB - 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, obtaining a transmission spectrum from 200 to 800 nm. Our reductions yielded a broadband 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 submicron particles and retrievals indicating a high-opacity patchy cloud. While our UVIS/G280 data only offer weak evidence for Na, adding archival Hubble Space Telescope (HST) WFC3/IR and STIS observations raises the overall Na detection significance to 4.1σ. 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-infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b

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