WISE 0146+4234

WISE J014656.66+423410.0

Hubble images of WISE 0146+4234 AB over three epochs, showing the increasing separation of the pair
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Andromeda
Right ascension 01h 46m 56.66s[1]
Declination 42° 34′ 10″[1]
Characteristics
Spectral type T9/Y0[2]
Apparent magnitude (H) 18.71 ± 0.24[1]
Astrometry
Proper motion (μ) RA: -451.6 ±0.9 mas/yr[3]
Dec.: -33.1 ±0.9 mas/yr[3]
Parallax (π)51.7 ± 2.0 mas[3]
Distance63 ± 2 ly
(19.3 ± 0.7 pc)
Details[2]
WISE 0146+4234A
Mass11 ±4[4] MJup
Radius0.913+0.023
−0.025 RJup
Surface gravity (log g)4.69+0.13
−0.11 cgs
Temperature345 ± 45 K
Age5 ±3[4] Gyr
WISE 0146+4234B
Mass10 ±4[4] MJup
Radius0.919+0.034
−0.015 RJup
Surface gravity (log g)4.65+0.14
−0.12 cgs
Temperature330 ± 45 K
Position (relative to WISE 0146+4234A)[2]
ComponentWISE 0146+4234B
Angular distance0.0875 ± 0.0021″
Position angle259.7 ± 1.3°
Projected separation0.93+0.12
−0.16 AU
Other designations
WISE J014656.66+423410.0,[1]
WISE 0146+4234[1]
Database references
SIMBADdata

WISE J014656.66+423410.0 (designation abbreviated to WISE 0146+4234) is a binary brown dwarf of spectral classes T9 and Y0[2] located in the constellation Andromeda. It is approximately 60 light-years from Earth.[5]

Analysis of the spectrum shows that the binary is probably old and has a total mass of 32+5
−6 MJ for an age of 10 billion years. If it is however young (about 1 billion years), it would be a pair of planetary-mass objects with a total mass of 8.7+1.3
−1.6 MJ. For an old system an orbital period of ≤10 years was predicted.[2] Another work estimated an age of 5 ±3 billion years, which was then used to estimate masses of 7-15 MJ and 6-14 MJ.[4]

Discovery

WISE 0146+4234 was discovered in 2012 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 0146+4234.[1]

Distance

The distance of WISE 0146+4234 was initially estimated to be 20 light-years from earth.[1] Later measurements of its stellar parallax showed that it was actually 60 light-years away.[5]

See also

The other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):[1]

References

  1. ^ a b c d e f g h i Kirkpatrick, J. Davy; et al. (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal. 753 (2). 156. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. S2CID 119279752.
  2. ^ a b c d e Dupuy, Trent J.; et al. (2015). "Discovery of a Low-luminosity, Tight Substellar Binary at the T/Y Transition". The Astrophysical Journal. 803 (2). 102. arXiv:1502.04707. Bibcode:2015ApJ...803..102D. doi:10.1088/0004-637X/803/2/102. S2CID 118507808.
  3. ^ a b Kirkpatrick, J. Davy; Gelino, Christopher R.; Faherty, Jacqueline K.; Meisner, Aaron M.; Caselden, Dan; Schneider, Adam C.; Marocco, Federico; Cayago, Alfred J.; Smart, R. L.; Eisenhardt, Peter R.; Kuchner, Marc J.; Wright, Edward L.; Cushing, Michael C.; Allers, Katelyn N.; Bardalez Gagliuffi, Daniella C. (2021-03-01). "The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs". The Astrophysical Journal Supplement Series. 253 (1): 7. arXiv:2011.11616. Bibcode:2021ApJS..253....7K. doi:10.3847/1538-4365/abd107. ISSN 0067-0049.
  4. ^ a b c d Fontanive, Clémence; Biller, Beth; Bonavita, Mariangela; Allers, Katelyn (2018-09-01). "Constraining the multiplicity statistics of the coolest brown dwarfs: binary fraction continues to decrease with spectral type". Monthly Notices of the Royal Astronomical Society. 479 (2): 2702–2727. arXiv:1806.08737. Bibcode:2018MNRAS.479.2702F. doi:10.1093/mnras/sty1682. ISSN 0035-8711.
  5. ^ a b Leggett, Sandy K.; et al. (2017). "The Y-type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry, and Near-infrared Spectroscopy". The Astrophysical Journal. 842 (2). 118. arXiv:1704.03573. Bibcode:2017ApJ...842..118L. doi:10.3847/1538-4357/aa6fb5. S2CID 119249195.