[
    {
        "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"
    }
]