The Breakthrough Listen Search for Intelligent Life: A Laser Search Pipeline for the Automated Planet Finder
Anna Zuckerman, Zoe Ko, Howard Isaacson, Steve Croft, Danny Price,, Matt Lebofsky, Andrew Siemion

TL;DR
This paper introduces an automated pipeline for optical laser searches in stellar spectra, enhancing sensitivity to technosignatures and applying it to 1983 spectra, but finds no evidence of extraterrestrial laser signals.
Contribution
It presents a novel data analysis pipeline using spectra-matching and multiple observations to improve laser detection sensitivity in optical SETI searches.
Findings
No convincing laser emission candidates detected.
Achieved sensitivity to 84 kW lasers at median star distance.
Validated pipeline performance with stellar property calibration.
Abstract
The Search for Extraterrestrial Intelligence (SETI) has traditionally been conducted at radio wavelengths, but optical searches are well-motivated and increasingly feasible due to the growing availability of high-resolution spectroscopy. We present a data analysis pipeline to search Automated Planet Finder (APF) spectroscopic observations from the Levy Spectrometer for intense, persistent, narrow bandwidth optical lasers. We describe the processing of the spectra, the laser search algorithm, and the results of our laser search on 1983 spectra of 388 stars as part of the Breakthrough Listen search for technosignatures. We utilize an empirical spectra-matching algorithm called SpecMatch-Emp to produce residuals between each target spectrum and a set of best-matching catalog spectra, which provides the basis for a more sensitive search than previously possible. We verify that SpecMatch-Emp…
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Taxonomy
TopicsSpace Science and Extraterrestrial Life · Astro and Planetary Science · Gamma-ray bursts and supernovae
