Developing a Drift Rate Distribution for Technosignature Searches of Exoplanets

Abstract

A stable-frequency transmitter with relative radial acceleration to a receiver will show a change in received frequency over time, known as a "drift rate''. For a transmission from an exoplanet, we must account for multiple components of drift rate: the exoplanet's orbit and rotation, the Earth's orbit and rotation, and other contributions. Understanding the drift rate distribution produced by exoplanets relative to Earth, can a) help us constrain the range of drift rates to check in a Search for Extraterrestrial Intelligence (SETI) project to detect radio technosignatures and b) help us decide validity of signals-of-interest, as we can compare drifting signals with expected drift rates from the target star. In this paper, we modeled the drift rate distribution for $\sim$5300 confirmed exoplanets, using parameters from the NASA Exoplanet Archive (NEA). We find that confirmed exoplanets have drift rates such that 99\% of them fall within the $\pm$53 nHz range. This implies a distribution-informed maximum drift rate $\sim$4 times lower than previous work. To mitigate the observational biases inherent in the NEA, we also simulated an exoplanet population built to reduce these biases. The results suggest that, for a Kepler-like target star without known exoplanets, $\pm$0.44 nHz would be sufficient to account for 99\% of signals. This reduction in recommended maximum drift rate is partially due to inclination effects and bias towards short orbital periods in the NEA. These narrowed drift rate maxima will increase the efficiency of searches and save significant computational effort in future radio technosignature searches.

arXiv comment15 pages, 8 figures

References in corpus (23)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Transiting Exoplanet Survey Satellite
• The James Webb Space Telescope
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• The NASA Exoplanet Archive: Data and Tools for Exoplanet Research
• The Exoplanet Population Observation Simulator. I - The Inner Edges of Planetary Systems
• Architectures of Exoplanetary Systems. I: A Clustered Forward Model for Exoplanetary Systems around Kepler's FGK Stars
• Kepler-78 and the Ultra-Short-Period Planets
• The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars over 1.10-3.45 GHz
• Architectures of Exoplanetary Systems. III: Eccentricity and Mutual Inclination Distributions of AMD-stable Planetary Systems
• The Breakthrough Listen Search for Intelligent Life: Public Data, Formats, Reduction and Archiving
• Nitrogen Dioxide Pollution as a Signature of Extraterrestrial Technology
• Measuring Transit Signal Recovery in the Kepler Pipeline IV: Completeness of the DR25 Planet Candidate catalog
• Choosing a Maximum Drift Rate in a SETI Search: Astrophysical Considerations
• The Magellan-TESS Survey I: Survey Description and Mid-Survey Results
• Analysis of the Breakthrough Listen signal of interest blc1 with a technosignature verification framework
• The Nine Axes of Merit for Technosignature Searches
• A Search for Technosignatures Around 31 Sun-like Stars with the Green Bank Telescope at 1.15-1.73 GHz
• The implementation of a Fast-Folding pipeline for long-period pulsar searching in the PALFA survey
• The Breakthrough Listen Search for Intelligent Life: MeerKAT Target Selection
• Architectures of Compact Multi-planet Systems: Diversity and Uniformity
• The Breakthrough Listen Search for Intelligent Life: A Laser Search Pipeline for the Automated Planet Finder

Cited by in corpus (5)

• The Breakthrough Listen Search for Intelligent Life: Technosignature Search of 97 Nearby Galaxies
• A Radio Technosignature Search of TRAPPIST-1 with the Allen Telescope Array
• COSMIC's Large-Scale Search for Technosignatures during the VLA sky Survey: Survey Description and First Results
• Dual-Backend Multibeam Position Switching Targeted SETI Observations toward Nearby Active Planet-Hosting Systems with FAST
• The VLA and High-Frequency SETI: Expanding the Search for Life