Author Archives: Ryan Carl Terrien

Wavelength-dependent behavior of the HPF Fabry-Pérot

Posted on May 6, 2021 by Ryan Carl Terrien

The need for a good ruler HPF is a high-precision spectrograph; it is designed to make very precise measurements of the wavelengths of stellar spectral features, so that the subtle Doppler shifts related to any orbiting exoplanets can be detected. … Continue reading →

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The HPF Astro-Comb

Posted on February 19, 2019 by Ryan Carl Terrien

After beginning operations earlier this year, HPF continues to patiently watch for the subtle Doppler shifting of stellar spectra that hints at the back-and-forth tug of orbiting exoplanets. As described in previous blog posts, HPF records spectra on a detector … Continue reading →

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The 2 square-inch detector at the heart of HPF

Posted on January 21, 2015 by Ryan Carl Terrien

A little history Among the variety of components that make up HPF, the mammoth 10m Hobby-Eberly Telescope and the hefty 200lb diffraction grating are certainly the most imposing. Although these are among the best and most advanced tools in modern … Continue reading →

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