Completeness and dynamical stability in exoplanet occurrence rates
Abstract
Exoplanet population studies are often quantified through the "occurrence rate" of certain types of planet. This value can be calculated from a survey of a sample of stars by taking the "detection rate" and correcting with a completeness factor. This completeness is calculated via detection limits on each individual star, and can be calculated either individually for each detected planet or averaged in a certain area of parameter space. We test whether either the average completeness or individual completeness performs better than the other. We also test whether including dynamical stability constraints in the detection limits improves the occurrence rate results. We use synthetic sets of exoplanetary systems and calculate occurrence rates for each and compare to what the value would be with perfect information. We compare how close each method is to the ground truth to assess which is most suitable. Overall, in our synthetic sets, the average completeness is more reliable though it can be a problem if there is a sharp change in the underlying population within the area of parameter-space considered. We find that using dynamical stability conditions causes a bias in the occurrence rate and do not recommend using these.
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BibTeX
@misc{baycroft2026completeness,
title = {{Completeness and dynamical stability in exoplanet occurrence rates}},
author = {Thomas A. Baycroft and Manu Stalport and Romain Eltschinger and Matteo Pinamonti and Jeanne Davoult and Khaled Al Moulla and Yann Alibert},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40964},
eprint = {2610.40964},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40964},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Completeness and dynamical stability in exoplanet occurrence rates
AU - Thomas A. Baycroft
AU - Manu Stalport
AU - Romain Eltschinger
AU - Matteo Pinamonti
AU - Jeanne Davoult
AU - Khaled Al Moulla
AU - Yann Alibert
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40964
UR - https://arxiv.org/abs/2610.40964
AB - Exoplanet population studies are often quantified through the "occurrence rate" of certain types of planet. This value can be calculated from a survey of a sample of stars by taking the "detection rate" and correcting with a completeness factor. This completeness is calculated via detection limits on each individual star, and can be calculated either individually for each detected planet or averaged in a certain area of parameter space. We test whether either the average completeness or individual completeness performs better than the other. We also test whether including dynamical stability constraints in the detection limits improves the occurrence rate results. We use synthetic sets of exoplanetary systems and calculate occurrence rates for each and compare to what the value would be with perfect information. We compare how close each method is to the ground truth to assess which is most suitable. Overall, in our synthetic sets, the average completeness is more reliable though it can be a problem if there is a sharp change in the underlying population within the area of parameter-space considered. We find that using dynamical stability conditions causes a bias in the occurrence rate and do not recommend using these.
ER -