WISEPC J112254.73+255021.5 (also called WISE J1122+25) is a brown dwarf with a spectral type T6. It co-moves with LHS 302 (LP 374-39), an M-dwarf, with a separation of around 4500 AU.[1] WISE J1122+25 was detected in radio emission with the Arecibo radio telescope[4] and the Very Large Array (VLA).[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 22m 55.50s |
| Declination | +25° 50′ 25.07″ |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | T6[1] |
| Astrometry | |
| Proper motion (μ) | RA: -980.1 ±1.2 mas/yr[2] Dec.: -312.0 ±0.8 mas/yr[2] |
| Parallax (π) | 66.3 ± 2.3 mas[2] |
| Distance | 49 ± 2 ly (15.1 ± 0.5 pc) |
| Details | |
| Mass | 16.72 ±16.58[3] MJup |
| Radius | 1.09 ±0.16[3] RJup |
| Surface gravity (log g) | 4.56 ±0.51[3] cgs |
| Temperature | 855 ±88[2] 790 ±58[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
WISE J1122+25 was discovered with the Wide-field Infrared Survey Explorer and spectroscopy with the NASA Infrared Telescope Facility confirmed it as a T6.[1] The object was first detected on 2013 May 8 with the Arecibo at 5 GHz. Five flares were detected in multiple week-long confirmation runs from December 2013 to January 2014. Observations in 2015 did not produce any detections. The magnetic field strength was estimated to be B≥1.8 kG. The pulses have a duration of 30–120 s and show a rapid frequency drift. The pulses are sporadic and have a left circular polarization fraction of 15% to 100%. Analysis of the data found an unusual short period of 17.26 minutes for the flares. This would mean that WISE J1122+25 is highly oblate and near its break-up rate.[4] Observation with the VLA did find a higher rotation period of about 116 minutes and infrared observations with Gemini did not detect variability. This would make the rotation period more similar to rotation periods found in other brown dwarfs. The handedness of the circular polarization changed twice in the VLA observation. This is likely due to the magnetic dipole being highly misaligned with its rotation axis.[5]
See also
editOther T-dwarfs with detected radio emission
- SIMP J013656.5+093347.3 T2.5, planetary-mass object
- 2MASS J10475385+2124234 T6.5
- WISEPA J101905.63+652954.2 T5.5+T7.0
- WISEPA J062309.94-045624.6 T8
References
edit- ^ a b c Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, A.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E. (2011-12-01). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement Series. 197 (2): 19. arXiv:1108.4677. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19. ISSN 0067-0049.
- ^ a b c 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 Sanghi, Aniket (November 8, 2023). "Table of Ultracool Fundamental Properties". zenodo. doi:10.5281/zenodo.10086810. Retrieved 2024-10-05.
- ^ a b Route, Matthew; Wolszczan, Alexander (2016-04-01). "Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with a Possible Ultra-short Periodicity". The Astrophysical Journal. 821 (2): L21. arXiv:1604.04543. Bibcode:2016ApJ...821L..21R. doi:10.3847/2041-8205/821/2/L21. ISSN 0004-637X.
- ^ a b Williams, P. K. G.; Gizis, J. E.; Berger, E. (2017-01-01). "Variable and Polarized Radio Emission from the T6 Brown Dwarf WISEP J112254.73+255021.5". The Astrophysical Journal. 834 (2): 117. arXiv:1608.04390. Bibcode:2017ApJ...834..117W. doi:10.3847/1538-4357/834/2/117. ISSN 0004-637X.