Exoplanets Prediction in Multiplanetary Systems

TL;DR

This study uses the Titius-Bode relation and MCMC analysis to predict 426 additional exoplanets in known multiplanetary systems, with many potentially habitable and smaller in size, improving orbital period estimates.

Contribution

It applies the TB relation with MCMC to predict new exoplanets in multiplanetary systems, enhancing previous predictions with better orbital period uncertainties.

Findings

53% of systems follow the TB relation better than the Solar System.

Predicted 426 new exoplanets, 47 within habitable zones.

Improved orbital period measurement accuracy.

Abstract

We present the results of a search for additional exoplanets in all multiplanetary systems discovered to date, employing a logarithmic spacing between planets in our Solar System known as the Titius-Bode (TB) relation. We use the Markov Chain Monte Carlo method and separately analyse 229 multiplanetary systems that house at least three or more confirmed planets. We find that the planets in $\sim53\%$ of these systems adhere to a logarithmic spacing relation remarkably better than the Solar System planets. Using the TB relation, we predict the presence of 426 additional exoplanets in 229 multiplanetary systems, of which 197 candidates are discovered by interpolation and 229 by extrapolation. Altogether, 47 predicted planets are located within the habitable zone (HZ) of their host stars, and five of the 47 planets have a maximum mass limit of 0.1-2$M_{\oplus}$ and a maximum radius lower than 1.25$R_{\oplus}$. Our results and prediction of additional planets agree with previous studies' predictions; however, we improve the uncertainties in the orbital period measurement for the predicted planets significantly.