Garreth Ruane

Observing Exoplanets with High Dispersion Coronagraphy. I. The Scientific Potential of Current and Next-generation Large Ground and Space Telescopes

Direct imaging of exoplanets presents a formidable technical challenge owing to the small angular separation and high contrast between exoplanets and their host stars. High Dispersion Coronagraphy (HDC) is a pathway to achieve unprecedented sensitivity to Earth-like planets in the habitable zone. Here, we present a framework to simulate HDC observations and data analyses. The goal of these simulations is to perform a detailed analysis of the trade-off between raw star light suppression and spectral resolution for various instrument configurations, target types, and science cases. We predict the performance of an HDC instrument at Keck observatory for characterizing directly imaged gas-giant planets in near infrared bands. We also simulate HDC observations of an Earth-like planet using next-generation ground-based (TMT) and spaced-base telescopes (HabEx and LUVOIR). We conclude that ground-based ELTs are more suitable for HDC observations of an Earth-like planet than future space-based missions owing to the considerable difference in collecting area. For ground-based telescopes, HDC observations can detect an Earth-like planet in the habitable zone around an M dwarf star at 10

Observing Exoplanets with High-Dispersion Coronagraphy. II. Demonstration of an Active Single-Mode Fiber Injection Unit

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Apodized vortex coronagraph designs for segmented aperture telescopes

starlight suppression level. Compared to the 10

Lyot-plane phase masks for improved high-contrast imaging with a vortex coronagraph

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Nodal areas in coherent beams

planet/star contrast, HDC relaxes the starlight suppression requirement by a factor of 10

Optical vortex coronagraphy with an elliptical aperture

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Deep imaging search for planets forming in the TW Hya protoplanetary disk with the Keck/NIRC2 vortex coronagraph

. For space-based telescopes, detector noise will be a major limitation at spectral resolutions higher than 10

Three years of harvest with the vector vortex coronagraph in the thermal infrared

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Keck Planet Imager and Characterizer: concept and phased implementation

. Considering detector noise and speckle chromatic noise, R=400 (1600) is the optimal spectral resolutions for HabEx(LUVOIR). The corresponding starlight suppression requirement to detect a planet with planet/star contrast=

Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758

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