WISE J1122+25 is a brown dwarf with radio emission.
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Evolutionary stage
! style="text-align:left" | Spectral type
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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. WISE J1122+25 was detected in radio emission with the Arecibo radio telescope and the Very Large Array (VLA).
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. 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. 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.
See also.
Other T-dwarfs with detected radio emission
References.
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