WISEPA J101905.63+652954.2
 The binary WISE 1019+6529 with Keck AO | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 19m 05.75s |
| Declination | +65° 29′ 52.70″ |
| Characteristics | |
| Evolutionary stage | binary brown dwarf |
| Spectral type | T5.5 ±0.5 & T7.0 ±0.5[1] |
| Astrometry | |
| Parallax (π) | 41.25 ± 1.75 mas[2] |
| Distance | 79 ± 3 ly (24 ± 1 pc) |
| Details[1] | |
| WISE 1019+6529A | |
| Mass | 41 ±18 MJup |
| Luminosity (bolometric) | 10-4.994 ± 0.063 L☉ |
| Surface gravity (log g) | 5.5 cgs |
| Temperature | 1000 K |
| Rotation | 3.13+0.32 −0.27 hours |
| WISE 1019+6529B | |
| Mass | 32 ±16 MJup |
| Orbit[1] | |
| Primary | WISE 1019+6529A |
| Companion | WISE 1019+6529B |
| Period (P) | >30 yr |
| Semi-major axis (a) | >5.2 AU |
| Eccentricity (e) | <0.96 |
| Inclination (i) | <86° |
| Position (relative to WISE 1019+6529A)[1] | |
| Component | WISE 1019+6529B |
| Epoch of observation | 15 January 2015 |
| Angular distance | 423.0 ± 1.6 mas |
| Position angle | 161.71 ± 0.23° |
| Projected separation | 9.9 ± 0.4 AU |
| Other designations | |
| Database references | |
| SIMBAD | data |
WISEPA J101905.63+652954.2 (also called WISE 1019+6529) is a binary made up of two cold brown dwarfs. Both brown dwarfs have a late spectral type T. The pair was detected in radio emission, which is pulsed and periodic. The radio emission could, in principle, be powered by the interaction of the binary.[1]
WISE 1019+6529 was discovered in 2011 with the Wide-field Infrared Survey Explorer and spectroscopy from the NASA Infrared Telescope Facility, Palomar and Keck Observatory confirmed it as a T6 or T7-dwarf.[3] A preliminary parallax is published, placing it 24 parsec distant from the Solar System, and it has a proper motion of 150.6 ±1.1 mas/yr.[2] In 2023 a study was published, describing the 144 MHz highly circularly polarised radio emission detected with the Low Frequency Array. The same paper describes observations with Keck adaptive optics, which showed that the brown dwarf is a binary. The researchers find a polar dipole magnetic field strength of 660 ± 300 Gauss for the T5.5 dwarf and 460 ± 210 Gauss for the T5.5 dwarf. The surface magnetic field strength is constrained between 51.4–103 Gauss, which was constrained with cyclotron maser emission and the upper limit of H-alpha luminosity. The radio emission could, in principle, be powered by a binary interaction, if the mass loss rate is ≥25 tonnes per second. The researchers also find that the radio emission is consistent with a Jupiter-like aurora.[1]
See also
[edit]Other T-dwarfs with detected radio emission[4]
- SIMP J013656.5+093347.3 T2.5, planetary-mass object
- 2MASS J10475385+2124234 T6.5
- WISEPC J112254.73+255021.5 T6
- WISEPA J062309.94-045624.6 T8
References
[edit]- ^ a b c d e f Vedantham, H. K.; Dupuy, T. J.; Evans, E. L.; Sanghi, A.; Callingham, J. R.; Shimwell, T. W.; Best, W. M. J.; Liu, M. C.; Zarka, P. (2023-07-01). "Polarised radio pulsations from a new T-dwarf binary". Astronomy and Astrophysics. 675: L6. arXiv:2301.01003. Bibcode:2023A&A...675L...6V. doi:10.1051/0004-6361/202244965. ISSN 0004-6361.
- ^ a b Kirkpatrick, J. Davy; Martin, Emily C.; Smart, Richard L.; Cayago, Alfred J.; Beichman, Charles A.; Marocco, Federico; Gelino, Christopher R.; Faherty, Jacqueline K.; Cushing, Michael C.; Schneider, Adam C.; Mace, Gregory N.; Tinney, Christopher G.; Wright, Edward L.; Lowrance, Patrick J.; Ingalls, James G. (2019-02-01). "Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime". The Astrophysical Journal Supplement Series. 240 (2): 19. arXiv:1812.01208. Bibcode:2019ApJS..240...19K. doi:10.3847/1538-4365/aaf6af. ISSN 0067-0049.
- ^ 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.
- ^ Rose, Kovi; Pritchard, Joshua; Murphy, Tara; Caleb, Manisha; Dobie, Dougal; Driessen, Laura; Duchesne, Stefan W.; Kaplan, David L.; Lenc, Emil; Wang, Ziteng (2023-07-01). "Periodic Radio Emission from the T8 Dwarf WISE J062309.94-045624.6". The Astrophysical Journal. 951 (2): L43. arXiv:2306.15219. Bibcode:2023ApJ...951L..43R. doi:10.3847/2041-8213/ace188. ISSN 0004-637X.