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WISE 1405 5534

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Constellation
  
Ursa Major

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HD 78209, 4 Ursae Majoris

WISE 1405+5534 (full designation WISEPC J140518.40+553421.4) is a brown dwarf of spectral class Y0 (pec?), located in constellation Ursa Major at approximately 25.3 light-years from Earth. It is one of the Sun's nearest neighbors and was estimated to be only 12.4 light-years from the Sun in 2011.

Contents

Discovery

WISE 1405+5534 was discovered in 2011 from data collected by the Wide-field Infrared Survey Explorer (WISE) in the infrared at a wavelength of 40 cm (16 in). WISE 1405+5534 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.

  • Kirkpatrick et al. presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 1405+5534.
  • Cushing et al. presented discovery of seven brown dwarfs—one of T9.5 type, and six of Y-type—first members of the Y spectral class, ever discovered and spectroscopically confirmed, including "archetypal member" of the Y spectral class WISE 1828+2650, and WISE 1405+5534. These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).

    • Distance

    Currently the most accurate distance estimate of WISE 1405+5534 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.129 ± 0.019 arcsec, corresponding to a distance 7.8+1.3
    −1.0     pc, or 25.3+4.4
    −3.2     ly.

    WISE 1405+5534 distance estimates

    Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

    Space motion

    WISE 1405+5534 has a large proper motion of about 2281 milliarcseconds per year.

    WISE 1405+5534 proper motion estimates

    The most accurate estimates are marked in bold.

    Spectral class and temperature

    The object's temperature estimate is 350 K (about 77 °C / 170 °F). Its spectrum is similar with spectrum of another Y-dwarf WISE 1738+2732. However, WISE 1405+5534's spectrum has a red shift of H-band flux peak, suggesting that WISE 1405+5534 may be peculiar, therefore it is classified as Y0 (pec?).

    References

    WISE 1405+5534 Wikipedia
    (Text) CC BY-SA


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