WISE J2209+2711 (WISE J220905.73+271143.9) is a brown dwarf of spectral type Y0:,[1] located in constellation Pegasus at 22 light-years from Earth.[6] Its discovery was published in 2014 by Cushing et al.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 09m 05.734s |
| Declination | +27° 11′ 44.00″ |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | Y0[1] |
| Astrometry | |
| Proper motion (μ) | RA: +1204.40±2.14 mas/yr[2] Dec.: −1362.08±1.34 mas/yr[2] |
| Parallax (π) | 161.7±2.0 mas[3] |
| Distance | 20.2 ± 0.2 ly (6.18 ± 0.08 pc) |
| Details | |
| Mass | 9±1[4] MJup |
| Radius | 1.06±0.01[4] RJup |
| Luminosity | 10−6.82±0.03[5] L☉ |
| Surface gravity (log g) | 4.28±0.05[4] cgs |
| Temperature | 350±3[4] K |
| Metallicity | = 0.47±0.05[4] |
| Age | 2[4] Gyr |
| Other designations | |
| WISE J220905.73+271143.9[1] | |
| Database references | |
| SIMBAD | data |
  WISE J2209+2711 Location of WISE J2209+2711 in the constellation Pegasus | |
Physical properties
editWISE J2209+2711 is one of a few Y-dwarfs observed with the NIRSpec and MIRI instruments aboard the James Webb Space Telescope. The modelling re-produced the spectrum with an excellent fit using phosphine-free and diabatic models. The excellent fit was achieved with a model that used an effective temperature of 350 K (77 °C; 170 °F) and a surface gravity of 104 cgs. This corresponds to a 5 MJ object with an age of 800 Myr.[7] An atmospherical retrieval of WISE J2209+1711's spectral energy distribution, collected by JWST's NIRSpec and MIRI instruments, derive a mass of 9 MJ, a radius of 1.06 RJ, an effective temperature of 350 K (77 °C; 170 °F) and a surface gravity of 104.28 cgs. The position of WISE J2209+2711 in the surface gravity-temperature diagram indicates an age close to two Gyr.[4]
See also
editReferences
edit- 1 2 3 4 Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Mace, Gregory N.; Skrutskie, Michael F.; Gould, Andrew (2014). "Three New Cool Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer (WISE) and an Improved Spectrum of the Y0 Dwarf WISE J041022.71+150248.4". The Astronomical Journal. 147 (5): 113. arXiv:1402.1378. Bibcode:2014AJ....147..113C. doi:10.1088/0004-6256/147/5/113. S2CID 5858277.
- 1 2 Fontanive, Clémence; Bedin, Luigi R.; Albert, Loïc; Gagliuffi, Daniella C. Bardalez (2024-12-21). "The Y Dwarf Population with HST: unlocking the secrets of our coolest neighbours -- II. Parallaxes and Proper Motions". Monthly Notices of the Royal Astronomical Society. 537 (1): 419. arXiv:2412.16679. Bibcode:2025MNRAS.537..419F. doi:10.1093/mnras/staf032.
- ↑ 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. (2021). "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. S2CID 227126954.
- 1 2 3 4 5 6 7 Kothari, Harshil; Cushing, Michael C.; Beiler, Samuel A.; Visscher, Channon; Marley, Mark S.; Burningham, Ben; Schneider, Adam C.; Kirkpatrick, J. Davy (2026-04-06). "A Comprehensive Atmospheric Retrieval Analysis of 22 James Webb Space Telescope Spectral Energy Distributions of Cool Brown Dwarfs". arXiv:2604.05104 [astro-ph.SR].
- ↑ Tu, Zhijun; Wang, Shu; Liu, Jifeng (2024). "Physical Parameters and Properties of 20 Cold Brown Dwarfs in JWST". The Astrophysical Journal. 976 (1): 82. arXiv:2409.19191. Bibcode:2024ApJ...976...82T. doi:10.3847/1538-4357/ad815a.
- ↑ Beichman, C.; Gelino, Christopher R.; Kirkpatrick, J. Davy; Cushing, Michael C.; Dodson-Robinson, Sally; Marley, Mark S.; Morley, Caroline V.; Wright, E. L. (2014). "WISE Y Dwarfs As Probes of the Brown Dwarf-Exoplanet Connection". The Astrophysical Journal. 783 (2): 68. arXiv:1401.1194v2. Bibcode:2014ApJ...783...68B. doi:10.1088/0004-637X/783/2/68. S2CID 119302072.
- ↑ Leggett, S. K.; Tremblin, Pascal (2024-01-01). "James Webb Space Telescope Spectra of Cold Brown Dwarfs are Well-reproduced by Phosphine-free, Diabatic, ATMO2020++ Models". Research Notes of the American Astronomical Society. 8 (1): 13. Bibcode:2024RNAAS...8...13L. doi:10.3847/2515-5172/ad1b61. ISSN 2515-5172.
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