English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Transits of exoplanets observed in the near-UV have been used to study thescattering properties of their atmospheres and possible star-planetinteractions. We observed the primary transits of 15 exoplanets (CoRoT-1b,GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-16b, HAT-P-22b, TrES-2b, TrES-4b, WASP-1b,WASP-12b, WASP-33b, WASP-36b, WASP-44b, WASP-48b, and WASP-77Ab) in the near-UVand several optical photometric bands to update their planetary parameters,ephemerides, search for a wavelength dependence in their transit depths toconstrain their atmospheres, and determine if asymmetries are visible in theirlight curves. Here we present the first ground-based near-UV light curves for12 of the targets (CoRoT-1b, GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-22b, TrES-2b,TrES-4b, WASP-1b, WASP-33b, WASP-36b, WASP-48b, and WASP-77Ab). We find thatnone of the near-UV transits exhibit any non-spherical asymmetries, this resultis consistent with recent theoretical predictions by Ben-Jaffel et al. andTurner et al. The multi-wavelength photometry indicates a constant transitdepth from near-UV to optical wavelengths in 10 targets (suggestive of clouds),and a varying transit depth with wavelength in 5 targets (hinting at Rayleighor aerosol scattering in their atmospheres). We also present the firstdetection of a smaller near-UV transit depth than that measured in the opticalin WASP-1b and a possible opacity source that can cause such radius variationsis currently unknown. WASP-36b also exhibits a smaller near-UV transit depth at2.6$\sigma$. Further observations are encouraged to confirm the transit depthvariations seen in this study.

Ground-based near-UV observations of 15 transiting exoplanets: Constraints on their atmospheres and no evidence for asymmetrical transits