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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the detection of two new systems containing transiting planets.Both were identified by WASP as worthy transiting planet candidates.Radial-velocity observations quickly verified that the photometric signals wereindeed produced by two transiting hot Jupiters. Our observations also show thepresence of additional Doppler signals. In addition to short-period hotJupiters, we find that the WASP-53 and WASP-81 systems also host brown dwarfs,on fairly eccentric orbits with semi-major axes of a few astronomical units.WASP-53c is over 16 $M_{\rm Jup} \sin i_{\rm c}$ and WASP-81c is 57 $M_{\rmJup} \sin i_{\rm c}$. The presence of these tight, massive companions restrictstheories of how the inner planets were assembled. We propose two alternativeinterpretations: a formation of the hot Jupiters within the snow line, or thelate dynamical arrival of the brown dwarfs after disc-dispersal.  We also attempted to measure the Rossiter--McLaughlin effect for both hotJupiters. In the case of WASP-81b we fail to detect a signal. For WASP-53b wefind that the planet is aligned with respect to the stellar spin axis. Inaddition we explore the prospect of transit timing variations, and of usingGaia's astrometry to measure the true masses of both brown dwarfs and alsotheir relative inclination with respect to the inner transiting hot Jupiters.

Peculiar architectures for the WASP-53 and WASP-81 planet-hosting systems