Papers › The Rapid Imaging Planetary Spectrograph
The Rapid Imaging Planetary Spectrograph
Patrick Lierle, Carl Schmidt, Jeffrey Baumgardner, Luke Moore, Emma Lovett
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The Rapid Imaging Planetary Spectrograph (RIPS) was designed as a long-slit high-resolution spectrograph for the specific application of studying atmospheres of spatially extended solar system bodies. With heritage in terrestrial airglow instruments, RIPS uses an echelle grating and order-sorting filters to obtain optical spectra at resolving powers up to R~127,000. An ultra-narrowband image from the reflective slit jaws is captured concurrently with each spectrum on the same EMCCD detector. The "rapid" portion of RIPS' moniker stems from its ability to capture high frame rate data streams, which enables the established technique known as "lucky imaging" to be extended to spatially resolved spectroscopy. Resonantly scattered emission lines of alkali metals, in particular, are sufficiently bright to be measured in short integration times. RIPS has mapped the distributions of Na and K emissions in Mercury's tenuous exosphere, which exhibit dynamic behavior coupled to the planet's plasma and meteoroid environment. An important application is daylight observations of Mercury at solar telescopes since synoptic context on the exosphere's distribution comprises valuable ground-based support for the upcoming BepiColombo orbital mission. As a conventional long slit spectrograph, RIPS has targeted the Moon's surface-bound exosphere where structure in linewidth and brightness as a function of tangent altitude are observed. At the Galilean moons, RIPS can study the plasma interaction with Io and place new constraints on the sputtered atmosphere of Europa, which in turn provides insight into the salinity of Europa's subsurface ocean. The instrumental design and construction are described herein, and these astronomical observations are presented to illustrate RIPS' performance as a visiting instrument at three different telescope facilities.
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