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Related Experiment Videos

Keck Imaging of Binary L Dwarfs.

Koerner, Kirkpatrick, McElwain

    The Astrophysical Journal
    |October 27, 1999
    PubMed
    Summary

    Binary L dwarf systems, likely substellar, were imaged using Keck near-infrared. These findings suggest companions to L dwarfs are common and similar in mass, similar to M dwarf binaries and Jovian planets.

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    Area of Science:

    • Astronomy
    • Astrophysics
    • Exoplanet Research

    Background:

    • L dwarfs are substellar objects with temperatures cooler than M dwarfs.
    • Binary systems are common in the galaxy, but their prevalence among L dwarfs is less understood.
    • Previous surveys have limited the detection of companions to L dwarf systems.

    Purpose of the Study:

    • To investigate the prevalence and characteristics of binary companions in L dwarf systems.
    • To determine if L dwarf binaries share similarities with M dwarf binaries and planetary system architectures.
    • To assess the potential for commonality and mass-sharing in L dwarf binary systems.

    Main Methods:

    • Keck near-infrared imaging was used to observe three binary L dwarf systems.
    • Trigonometric parallax measurements were utilized to estimate system distances.
    • Component flux ratios and projected physical separations were analyzed.

    Main Results:

    • Three binary L dwarf systems were identified, likely substellar.
    • One system, an L7 spectral type, is the coolest binary discovered to date.
    • Detected binaries exhibit component flux ratios near 1 and separations of 5-10 AU.

    Conclusions:

    • The detection rate suggests binary companions to L dwarfs may be common.
    • Similar-mass systems appear to predominate among L dwarf binaries.
    • The radial distribution of these binaries aligns with M dwarf binaries and Jovian planets.

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