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

Transit Timing Variations (TTVs) is currently the most successful method todetermine dynamical masses and orbital elements for Earth-sized transitingplanets. Precise mass determination is fundamental to restrict planetarydensities and thus infer planetary compositions. In this work, we presentNauyaca, a Python package dedicated to find planetary masses and orbitalelements through the fitting of observed mid-transit times from a N-bodyapproach. The fitting strategy consists in performing a sequence ofminimization algorithms (optimizers) that are used to identify high probabilityregions in the parameter space. These results from optimizers are used forinitialization of a Markov chain Monte Carlo (MCMC) method, using an adaptiveParallel-Tempering algorithm. A set of runs are performed in order to obtainposterior distributions of planetary masses and orbital elements. In order totest the tool, we created a mock catalog of synthetic planetary systems withdifferent number of planets where all of them transit. We calculate theirmid-transit times to give them as an input to Nauyaca, testing statisticallyits efficiency in recovering the planetary parameters from the catalog. For therecovered planets, we find typical dispersions around the real values of$\sim$1-14 M$_{\oplus}$ for masses, between 10-110 seconds for periods andbetween $\sim$0.01-0.03 for eccentricities. We also investigate the effects ofthe signal-to-noise and number of transits in the correct determination of theplanetary parameters. Finally, we suggest choices of the parameters that governthe tool, for the usage with real planets, according to the complexity of theproblem and computational facilities.

Nauyaca: a new tool to determine planetary masses and orbital elements through transit timing analysis