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

WASP-12b and Qatar-1b are transiting Hot Jupiters for which previous workshave suggested the presence of transit timing variations (TTVs) indicative ofadditional bodies in these systems - an Earth-mass planet in WASP-12 and abrown-dwarf mass object in Qatar-1. Here, we present 23 new WASP-12b and 18 newQatar-1b complete (or nearly complete) transit observations. We perform globalsystem fits to all of our light curves for each system, plus RV and stellarspectroscopic parameters from the literature. The global fits provide refinedsystem parameters and uncertainties for each system, including precise transitcenter times for each transit. The transit model residuals of the combined andfive minute binned light curves have a RMS of 183 and 255 parts per million(ppm) for WASP-12b and Qatar-1b, respectively. Most WASP-12b system parametervalues from this work are consistent with values from previous studies, buthave $\sim$ 40-50% smaller uncertainties. Most of the Qatar-1b system parametervalues and uncertainties from this work are consistent with values recentlyreported in the literature. We find no convincing evidence for sinusoidal TTVswith a semi-amplitude of more than $\sim$ 35 s and $\sim$ 25 s in the WASP-12band Qatar-1b systems, respectively.

Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets