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]
| 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] |
| Distance | 63 ± 2 ly (19.3 ± 0.7 pc) |
| Details[2] | |
| WISE 0146+4234A | |
| Mass | 11 ±4[4] MJup |
| Radius | 0.913+0.023 −0.025 RJup |
| Surface gravity (log g) | 4.69+0.13 −0.11 cgs |
| Temperature | 345 ± 45 K |
| Age | 5 ±3[4] Gyr |
| WISE 0146+4234B | |
| Mass | 10 ±4[4] MJup |
| Radius | 0.919+0.034 −0.015 RJup |
| Surface gravity (log g) | 4.65+0.14 −0.12 cgs |
| Temperature | 330 ± 45 K |
| Position (relative to WISE 0146+4234A)[2] | |
| Component | WISE 0146+4234B |
| Angular distance | 0.0875 ± 0.0021″ |
| Position angle | 259.7 ± 1.3° |
| Projected separation | 0.93+0.12 −0.16 AU |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
editWISE 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
editThe 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
editThe other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):[1]
- WISE 0350-5658 (Y1)
- WISE 0359-5401 (Y0)
- WISE 0535-7500 (≥Y1)
- WISE 0713-2917 (Y0)
- WISE 0734-7157 (Y0)
- WISE 2220-3628 (Y0)
References
edit- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.