[ { "id": "authors:ez8s6-r9906", "collection": "authors", "collection_id": "ez8s6-r9906", "cite_using_url": "https://authors.library.caltech.edu/records/ez8s6-r9906", "type": "conference_item", "title": "High-contrast spectroscopy testbed (HCST): tip/tilt sensing in reflection of the vector vortex coronagraph (VVC)", "author": [ { "family_name": "Bertrou-Cantou", "given_name": "Arielle", "clpid": "Bertrou-Cantou-Arielle" }, { "family_name": "Redmond", "given_name": "Susan F.", "orcid": "0000-0002-9618-4371", "clpid": "Redmond-Susan-F" }, { "family_name": "Mawet", "given_name": "Dimitri", "orcid": "0000-0002-8895-4735", "clpid": "Mawet-D" }, { "family_name": "Sercel", "given_name": "Greg P.", "clpid": "Sercel-Greg-P" }, { "family_name": "Echeverri", "given_name": "Daniel", "orcid": "0000-0002-1583-2040", "clpid": "Echeverri-D" }, { "family_name": "Desai", "given_name": "Niyati", "orcid": "0000-0002-2843-8325", "clpid": "Desai-Niyati" }, { "family_name": "Llop-Sayson", "given_name": "Jorge", "orcid": "0000-0002-3414-784X", "clpid": "Llop-Sayson-Jorge" }, { "family_name": "Ruane", "given_name": "Garreth", "orcid": "0000-0003-4769-1665", "clpid": "Ruane-G-J" }, { "family_name": "Serabyn", "given_name": "Eugene", "orcid": "0009-0009-2491-0694", "clpid": "Serabyn-Eugene" }, { "family_name": "Wallace", "given_name": "James Kent", "orcid": "0000-0001-5299-6899", "clpid": "Wallace-J-Kent" } ], "editor": [ { "family_name": "Coyle", "given_name": "Laura E." }, { "family_name": "Perrin", "given_name": "Marshall D." }, { "family_name": "Matsuura", "given_name": "Shuji" } ], "abstract": "

With the identified objective of enabling Earth-like exoplanets direct detection, and characterization of their atmospheric content, the Astro2020 report has placed the maturation of exoplanet imaging technology as a key priority for the coming decade. The High Contrast Spectroscopy Testbed (HCST) within the Caltech Exoplanet Technology laboratory serves as an in-air coronagraphic testbed demonstrator, integrating a high order deformable mirror for wavefront control and a vector vortex coronagraph (VVC). HCST has demonstrated excellent in-air contrast performance, achieving 1 × 10\u207b\u2078 raw contrast in broadband light, for both the apodized off-axis segmented pupil configuration and using single mode fiber planet injection. By introducing a low-order wavefront sensor (WFS) that utilizes either the in-band or out-of-band reflected light from the VVC coupled with a tip/tilt mirror, our objective is to address dynamic errors, thereby enhancing the wavefront stability of the experiment. We present in this proceeding the first steps towards a full tip/tilt control loop, starting with the optical design of our low-order camera. We performed a drift test overnight as a diagnostic of the coronagraphic performance stability and to possibly identify causes for the drift. Conclusions show that HCST demonstrate a remarkably stable environment to perform high-contrast imaging experiments, at the level of 1 × 10\u207b\u2078 contrast.

", "doi": "10.1117/12.3019237", "isbn": "9781510675070", "publisher": "SPIE", "place_of_publication": "Bellingham, WA", "publication": "Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave", "publication_date": "2024-08-23", "pages": "130926B" }, { "id": "authors:525rb-8xj03", "collection": "authors", "collection_id": "525rb-8xj03", "cite_using_url": "https://authors.library.caltech.edu/records/525rb-8xj03", "type": "conference_item", "title": "Recent upgrades to the Keck Planet Imager and Characterizer", "book_title": "Ground-based and Airborne Instrumentation for Astronomy X", "author": [ { "family_name": "Echeverri", "given_name": "Daniel", "orcid": "0000-0002-1583-2040", "clpid": "Echeverri-D" }, { "family_name": "Jovanovic", "given_name": "Nemanja", "orcid": "0000-0001-5213-6207", "clpid": "Jovanovic-N" }, { "family_name": "Delorme", "given_name": "Jacques-Robert", "orcid": "0000-0001-8953-1008" }, { "family_name": "Guthery", "given_name": "Charlotte", "orcid": "0009-0007-8340-6194" }, { "family_name": "Roberts", "given_name": "Mitsuko K.", "clpid": "Roberts-Mitsuko-K" }, { "family_name": "Nash", "given_name": "Reston", "clpid": "Nash-Reston" }, { "family_name": "Horstman", "given_name": "Katelyn", "orcid": "0000-0001-9708-8667", "clpid": "Horstman-Katelyn" }, { "family_name": "Xuan", "given_name": "Jerry W.", "orcid": "0000-0002-6618-1137", "clpid": "Xuan-Jerry-W" }, { "family_name": "Xin", "given_name": "Yinzi", "orcid": "0000-0002-6171-9081", "clpid": "Xin-Yinzi" }, { "family_name": "Finnerty", "given_name": "Luke", "orcid": "0000-0002-1392-0768" }, { "family_name": "Hsu", "given_name": "Chih-Chun", "orcid": "0000-0002-5370-7494" }, { "family_name": "Ruane", "given_name": "Garreth", "orcid": "0000-0003-4769-1665", "clpid": "Ruane-G-J" }, { "family_name": "Leifer", "given_name": "Stepahnie" }, { "family_name": "Zimmer", "given_name": "Jake", "orcid": "0009-0007-9419-5118", "clpid": "Zimmer-Jake" }, { "family_name": "Soda", "given_name": "Svarun", "clpid": "Soda-Svarun" }, { "family_name": "Schofield", "given_name": "Tobias", "clpid": "Schofield-Tobias" }, { "family_name": "Wallace", "given_name": "J. Kent", "orcid": "0000-0001-5299-6899", "clpid": "Wallace-J-Kent" }, { "family_name": "Wang", "given_name": "Jason", "orcid": "0000-0003-0774-6502", "clpid": "Wang-Jason-J" }, { "family_name": "Mawet", "given_name": "Dimitri", "orcid": "0000-0002-8895-4735", "clpid": "Mawet-D" }, { "family_name": "Marin", "given_name": "Eduardo", "orcid": "0009-0009-6982-2137" }, { "family_name": "Wizinowich", "given_name": "Peter", "orcid": "0000-0002-1646-442X" }, { "family_name": "Ge", "given_name": "Jinhao", "clpid": "Ge-Jinhao" }, { "family_name": "Gao", "given_name": "Maodong", "orcid": "0000-0002-7791-0008", "clpid": "Gao-Maodong" } ], "editor": [ { "family_name": "Vernet", "given_name": "Jo\u00ebl R." }, { "family_name": "Bryant", "given_name": "Julia J." }, { "family_name": "Motohara", "given_name": "Kentaro" } ], "abstract": "The Keck Planet Imager and Characterizer (KPIC) instrument at the Keck Observatory consists of a series of upgrades to the Keck II Adaptive Optics system and the NIRSPEC spectrograph to enable diffraction-limited, high-resolution (R\u223c35, 000) spectroscopy, originally in the K (\u223c2.0\u22122.5 \u03bcm) and L (\u223c3.2\u22123.7 \u03bcm) bands only. Phase I consisted of single-mode fiber injection/extraction units used in conjunction with an H band pyramid wavefront sensor. Using single-mode fibers provides a gain in stellar rejection, a substantial reduction in sky background, and a stable, well-defined line-spread function on the spectrograph. In 2022, Phase II brought a 1000-actuator deformable mirror, beam-shaping optics, a vortex fiber nulling mode, and more. In this paper we present the results of the latest upgrades to the KPIC instrument. Among these upgrades, a second fiber bundle with related injection/extraction optics and new dichroics were added to extend KPIC's science capabilities to y through H band, and to provide access to laser frequency combs for spectral calibration from y-K. Additionally, the charge 2 vortex mask for fiber nulling was supplemented with a charge 1 mask to enable spectroscopy of low mass companions at very small angular separations. Other upgrades included an atmospheric dispersion corrector, a new calibration source switching system, and an optimized tip/tilt control system. Here we show preliminary results of on-sky tests performed in the first few months of re-commissioning, along with the next steps for the instrument.", "doi": "10.1117/12.3019085", "isbn": "9781510675155", "publisher": "Society of Photo-Optical Instrumentation Engineers", "place_of_publication": "Bellingham, WA", "publication_date": "2024-08-14", "pages": "130962D" } ]