Author Archives: Samuel Peter Halverson

The Camera of HPF

Introduction: Spectrometer Cameras A spectrometer, as the name implies, records a ‘spectrum’ of an object. This spectrum, in its most basic form, is just a series of images of the instrument entrance aperture (whether it be a star, slit, optical … Continue reading

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What to do when your star wanders

As we’ve mentioned in prior blog posts, high precision Doppler radial velocity (RV) measurements require extraordinarily stable instruments to measure the spectral shifts in the stellar absorption features induced by orbiting planets. How small are these shifts? A 10 cm/s velocity signal, … Continue reading

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