WISE 0226−0211 (also known as WISEPA J022623.98−021142.8) is a brown dwarf binary with a combined spectral type of T7.[4] Its individual components have a spectral type that is as of now somewhat uncertain at T8-T8.5 for the primary and T9.5-Y0 for the secondary.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 26m 24.20s |
| Declination | −02° 11′ 37.66″ |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | T8+Y0[2] |
| Astrometry | |
| Proper motion (μ) | RA: -294.4 ±1.4 mas/yr[3] Dec.: -432.3 ±1.2 mas/yr[3] |
| Parallax (π) | 56.3 ± 2.5 mas[3] |
| Distance | 58 ± 3 ly (17.8 ± 0.8 pc) |
| Details[3] | |
| WISE 0226−0211A | |
| Temperature | 686 ± 79 K |
| WISE 0226−0211B | |
| Temperature | 511 ± 79 K |
| Position (relative to WISE 0226−0211A)[2] | |
| Component | WISE 0226−0211B |
| Angular distance | 2.1″ |
| Other designations | |
CNS5 617, WISEA J022623.99-021142.7, WISEP J022623.98-021142.8, WISE J022623.98-021142.8, EQ J0226-0211 | |
| Database references | |
| SIMBAD | data |
The object was first discovered in 2011 with the Wide-field Infrared Survey Explorer and follow-up observations with Keck revealed a spectral type of T7.[4] In 2019 the same team showed that the object is a common proper motion binary with a separation of 2.1 arcseconds from Spitzer images and one H-band Keck image (acquired by David Ciardi). The H-ch2 colors suggest a spectral type of about T8-T8.5 for the primary and about Y0 for the secondary. The absolute magnitudes on the other hand suggest spectral types of about T8-T8.5 for the primary and about T9.5-Y0 for the secondary. It is suspected that the combined spectral type of T7 is in error.[2]
See also
editother late T to Y dwarf binaries:
- WISE 1217+1626 T9+Y0
- WISE J0336−0143 Y+Y
- CFBDSIR J1458+1013 T9+Y0
- WISE 0146+4234 T9+Y0
- WISE J1711+3500 T8+T9.5
References
edit- ^ Brooks, Hunter; Kirkpatrick, J. Davy; Meisner, Aaron M.; Gelino, Christopher R.; Bardalez Gagliuffi, Daniella C.; Marocco, Federico; Schneider, Adam C.; Faherty, Jacqueline K.; Casewell, S. L.; Raghu, Yadukrishna; Kuchner, Marc J.; Backyard Worlds: Planet 9 Collaboration (2023-06-01). "Long-term 4.6 μm Variability in Brown Dwarfs and a New Technique for Identifying Brown Dwarf Binary Candidates". The Astronomical Journal. 165 (6): 232. arXiv:2304.05630. Bibcode:2023AJ....165..232B. doi:10.3847/1538-3881/acccf7. ISSN 0004-6256.
{{cite journal}}: CS1 maint: numeric names: authors list (link) - ^ a b c d 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.
- ^ 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: 7. arXiv:2011.11616. Bibcode:2021ApJS..253....7K. doi:10.3847/1538-4365/abd107. ISSN 0067-0049.
- ^ a b 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.