WISEA J1141−3326 (WISE J114156.67-332635.5, W1141) is a Y-dwarf, which means it is one of the coldest directly imaged astronomical objects.[3] It is likely a free-floating planetary-mass object.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 41m 57.47s |
| Declination | −33° 26′ 34.57″ |
| Characteristics | |
| Evolutionary stage | sub-brown dwarf |
| Spectral type | Y0[1] |
| Astrometry | |
| Proper motion (μ) | RA: -910.9 ±1.9 mas/yr[2] Dec.: -76.4 ±1.8 mas/yr[2] |
| Parallax (π) | 104.0 ± 2.9 mas[2] |
| Distance | 31.4 ± 0.9 ly (9.6 ± 0.3 pc) |
| Details[1] | |
| Mass | 3–8 MJup |
| Surface gravity (log g) | 3.75–4.25 cgs |
| Temperature | 460±79[2] K |
| Age | 0.1–1.0 Gyr |
| Other designations | |
CNS5 2863, WISEA J114156.67-332635.5, WISE J114156.71-332635.8 | |
| Database references | |
| SIMBAD | data |
W1141 was discovered in 2014 from data of the Wide-field Infrared Survey Explorer and at first the spectral type was estimated to be Y0, but no spectroscopic confirmation was present at the time.[3] In 2017 a spectrum from Gemini South was published, confirming it as a Y0 spectral type. This work found it to be metal-rich, between 100 Myrs and 1 Gyr young and low-mass (3–8 MJ). It has a tangential velocity of about 41 km/s.[1] It was found that this object overlaps with a background galaxy in early observations, contaminating the measured brightness. This had led to a falsely detection of a blue color, which is attributed to the contamination.[4]
See also
editReferences
edit- ^ a b c d Leggett, S. K.; Tremblin, P.; Esplin, T. L.; Luhman, K. L.; Morley, Caroline V. (2017-06-01). "The Y-type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry, and Near-infrared Spectroscopy". The Astrophysical Journal. 842 (2): 118. arXiv:1704.03573. Bibcode:2017ApJ...842..118L. doi:10.3847/1538-4357/aa6fb5. ISSN 0004-637X.
- ^ 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 (1): 7. arXiv:2011.11616. Bibcode:2021ApJS..253....7K. doi:10.3847/1538-4365/abd107. ISSN 0067-0049.
- ^ a b Tinney, C. G.; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Cushing, Mike; Morley, Caroline V.; Wright, Edward L. (2014-11-01). "The Luminosities of the Coldest Brown Dwarfs". The Astrophysical Journal. 796 (1): 39. arXiv:1410.0746. Bibcode:2014ApJ...796...39T. doi:10.1088/0004-637X/796/1/39. ISSN 0004-637X.
- ^ 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.