The Breakthrough Listen Search for Intelligent Life: No Evidence of Claimed Periodic Spectral Modulations in High Resolution Optical Spectra of Nearby Stars. (arXiv:1812.02258v1 [astro-ph.SR])

The Breakthrough Listen Search for Intelligent Life: No Evidence of Claimed Periodic Spectral Modulations in High Resolution Optical Spectra of Nearby Stars. (arXiv:1812.02258v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Isaacson_H/0/1/0/all/0/1">Howard Isaacson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Siemion_A/0/1/0/all/0/1">Andrew P. V. Siemion</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marcy_G/0/1/0/all/0/1">Geoffrey W. Marcy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hickish_J/0/1/0/all/0/1">Jack Hickish</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Price_D/0/1/0/all/0/1">Danny C. Price</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Enriquez_J/0/1/0/all/0/1">J. Emilio Enriquez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gizani_N/0/1/0/all/0/1">Nectaria Gizani</a>

We report on high-resolution spectra obtained by the Automated Planet Finder
and high resolution optical Levy Spectrometer and the search for periodic
spectral modulations, such as those reported in Borra (2016). In their analysis
of 2.5 million spectra from the Sloan Digital Sky Survey, Borra (2016) report
periodic spectral modulations in 234 stars, and suggest that these signals may
be evidence of extra-terrestrial civilizations. To further evaluate this claim,
we observed a total of three of the 234 stars with the Automated Planet Finder
Telescope and Levy Spectrometer including all stars brighter than a visual
magnitude of 14. Fourier analysis of the resultant spectra of these three
sources does not reveal any periodic spectral modulations at the reported
period, nor at any other period.

We report on high-resolution spectra obtained by the Automated Planet Finder
and high resolution optical Levy Spectrometer and the search for periodic
spectral modulations, such as those reported in Borra (2016). In their analysis
of 2.5 million spectra from the Sloan Digital Sky Survey, Borra (2016) report
periodic spectral modulations in 234 stars, and suggest that these signals may
be evidence of extra-terrestrial civilizations. To further evaluate this claim,
we observed a total of three of the 234 stars with the Automated Planet Finder
Telescope and Levy Spectrometer including all stars brighter than a visual
magnitude of 14. Fourier analysis of the resultant spectra of these three
sources does not reveal any periodic spectral modulations at the reported
period, nor at any other period.

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