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 on the host star.
The HUSTLE Program: The UV to Near-Infrared HST WFC3/UVIS G280 Transmission Spectrum of WASP-127b
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
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 (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.
fields
astro-ph.EP 1years
2025 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
The HUSTLE Program: The UV to Near-IR Transmission Spectrum of the Hot Jupiter KELT-7b
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 on the host star.