A NEW GAS CELL FOR HIGH-PRECISION DOPPLER MEASUREMENTS IN THE NEAR-INFRARED

    Authors

    L. Valdivielso; P. Esparza; E. L. Martin; D. Maukonen;R. E. Peale

    Comments

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    Abbreviated Journal Title

    Astrophys. J.

    Keywords

    instrumentation: spectrographs; stars: low-mass; techniques: radial; velocities; RADIAL-VELOCITY MEASUREMENTS; LASER FREQUENCY COMBS; SPECTROGRAPHS; CALIBRATION; PLANETS; Astronomy & Astrophysics

    Abstract

    High-resolution spectroscopy in the near-infrared could become the leading method for discovering extra-solar planets around very low mass stars and brown dwarfs. In order to help to achieve an accuracy of similar to m s(-1), we are developing a gas cell which consists of a mixture of gases whose absorption spectral lines span all over the near-infrared region. We present the most promising mixture, made of acetylene, nitrous oxide, ammonia, chloromethanes, and hydrocarbons. The mixture is contained in a small size 13 cm long gas cell and covers most of the H and K bands. It also shows small absorptions in the J band, but they are few and not sharp enough for near-infrared wavelength calibration. We describe the working method and experiments, and compare our results with the state of the art for near-infrared gas cells.

    Journal Title

    Astrophysical Journal

    Volume

    715

    Issue/Number

    2

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    1366

    Last Page

    1369

    WOS Identifier

    WOS:000277642100051

    ISSN

    0004-637X

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