CWISEP J1047+5457
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 47m 57.50s |
| Declination | +54° 57′ 42.17″ |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | Y1[1] |
| Astrometry | |
| Proper motion (μ) | RA: –447.9 ±41.7 mas/yr[2] Dec.: –65.5 ±35.2 mas/yr[2] |
| Parallax (π) | 68.1±4.9 mas[1] |
| Distance | 48 ± 3 ly (15 ± 1 pc) |
| Details | |
| Mass | 41±1[3] MJup |
| Radius | 0.88±0.01[3] RJup |
| Luminosity (bolometric) | 10−6.582 ± 0.063[1] L☉ |
| Temperature | 415±3[3] K |
| Metallicity | = 0.68±0.01[3] |
| Age | >10[3] Gyr |
| Other designations | |
| CWISEP J104756.81+545741.6 | |
| Database references | |
| SIMBAD | data |
![{\displaystyle {\begin{smallmatrix}\left[{\mathrm {M} }/{\mathrm {H} }\right]\end{smallmatrix}}}](./_assets_/eb734a37dd21ce173a46342d1cc64c92/d9a106d03666c72cc54c1dff07a5637d3adda9a1.svg)
CWISEP J1047+5457 (CWISEP J104756.81+545741.6, CWISEP J1047+54) is a Y-dwarf discovered in 2020.[4]
CWISEP J1047+5457 was discovered in 2020 from a preliminary CatWISE catalog, initially determined to have a spectral type of Y0.[4] Follow-up observations with JWST spectroscopy (NIRSpec and MIRI) showed that it had a spectral type of Y1. The observations showed that it had unusually strong carbon monoxide and carbon dioxide absorption. This causes the Spitzer ch1-ch2 color to be extremely blue (2.47 ±0.19 mag) for its spectral type and explains the misidentification as a Y0 in the discovery paper. The strong absorption might be explained with extreme disequilibrium chemistry, low surface gravity, or a low carbon to oxygen ratio. Other molecules, such as water vapor, methane and ammonia are also detected in the spectra. Phosphine is not detected.[1]
Another study suspects this object to be young and low mass. The researchers found that increased amount of CO and CO2 can be explained with a low gravity. A low gravity is commonly associated with a young age for brown dwarfs. The researchers estimated a mass of less than 3 MJ for an age of 200 Myr. The researchers also found a 52% likelihood that it belongs to the 40 Myr old Argus association, which would lower the mass to around 1 MJ.[5] However, atmospherical retrievals derive a mass of 41±1 MJ and radius of 0.88±0.01 RJ which, when compared to predictions of evolutionary models, imply an age of over 10 billion years.[3]
See also
- List of Y-dwarfs
- CWISE J1055+5443 is another Y-dwarf with blue ch1-ch2 color, here this is explained with a young age
- List of star systems within 45–50 light-years
References
- 1 2 3 4 Beiler, Samuel A.; Cushing, Michael C.; Kirkpatrick, J. Davy; Schneider, Adam C.; Mukherjee, Sagnick; Marley, Mark S.; Marocco, Federico; Smart, Richard L. (11 Jul 2024). "Precise Bolometric Luminosities and Effective Temperatures of 23 late-T and Y dwarfs Obtained with JWST". The Astrophysical Journal. 973 (2): 107. arXiv:2407.08518. Bibcode:2024ApJ...973..107B. doi:10.3847/1538-4357/ad6301.
- 1 2 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.
- 1 2 3 4 5 6 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].
- 1 2 Meisner, Aaron M.; Caselden, Dan; Kirkpatrick, J. Davy; Marocco, Federico; Gelino, Christopher R.; Cushing, Michael C.; Eisenhardt, Peter R. M.; Wright, Edward L.; Faherty, Jacqueline K.; Koontz, Renata; Marchese, Elijah J.; Khalil, Mohammed; Fowler, John W.; Schlafly, Edward F. (2020-02-01). "Expanding the Y Dwarf Census with Spitzer Follow-up of the Coldest CatWISE Solar Neighborhood Discoveries". The Astrophysical Journal. 889 (2): 74. arXiv:1911.12372. Bibcode:2020ApJ...889...74M. doi:10.3847/1538-4357/ab6215. ISSN 0004-637X.
- ↑ Albert, Loïc; Leggett, Sandy K.; Calissendorff, Per; Vandal, Thomas; Kirkpatrick, J. Davy; Gagliuffi, Daniella C. Bardalez; Furio, Matthew De; Meyer, Michael; Beichman, Charles A. (2025-01-23). "JWST 1.5 μm and 4.8 μm Photometry of Y Dwarfs". The Astronomical Journal. 169 (3): 163. arXiv:2501.14100. Bibcode:2025AJ....169..163A. doi:10.3847/1538-3881/adadf9.