Astronomy:WISE 2220−3628
Coordinates: 
22h 20m 55.31s, −36° 28′ 17.4″
250px WISE 2220-3628 Credit: NASA/ESA/CSA JWST MIRI | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 20m 55.31s[1] |
| Declination | −36° 28′ 17.4″[1] |
| Characteristics | |
| Spectral type | Y0[1] |
| Apparent magnitude (J (MKO-NIR filter system)) | 20.38 ± 0.17[1] |
| Apparent magnitude (H (MKO-NIR filter system)) | 20.81 ± 0.30[1] |
| Astrometry | |
| Radial velocity (Rv) | −53.2±2.8[2] km/s |
| Total velocity | 55.33±2.82[2] km/s |
| Proper motion (μ) | RA: 288.92 ±0.15[3] mas/yr Dec.: −97.10 ±0.16[3] mas/yr |
| Parallax (π) | 93.50 ± 1.02[3] mas |
| Distance | 34.9 ± 0.4 ly (10.7 ± 0.1 pc) |
| Details | |
| Mass | 6-35[2] MJup |
| Radius | 0.94±0.14[2] RJup |
| Surface gravity (log g) | 4.7±0.5[2] cgs |
| Temperature | 480±41[2] K |
| Age | 4.5±4.0[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
WISE J222055.31−362817.4 (designation abbreviated to WISE 2220−3628) is a brown dwarf of spectral class Y0,[1] located in constellation Grus at approximately 34.2 light-years from Earth.[4]
Discovery
WISE 2220−3628 was discovered in 2012 by J. Davy Kirkpatrick et al. from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite—NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. In 2012 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 2220−3628.[1]
Properties
Y-class dwarfs are among the coldest of all brown dwarfs.[1] WISE 2220-3628 was observed with JWST and found to be very similar to CWISEP J1935-1546, with the difference of having no signature of an aurora and no temperature inversion in its atmosphere.[2]
Distance
The most accurate distance estimate of WISE 2220−3628 was a trigonometric parallax, published in 2014 by Beichman et al.: 0.136 ± 0.017 arcsec, corresponding to a distance of 7.4 ± 0.9 pc (24.1 ± 2.9 ly).[5] Later the parallax measurement was improved revealing a larger distance of about 34 light years.[4]
See also
- List of star systems within 30–35 light-years
- List of Y-dwarfs
- WISE 0146+4234 (Y0)
- WISE 0350−5658 (Y1)
- WISE 0359−5401 (Y0)
- WISE 0535−7500 (≥Y1)
- WISE 0713−2917 (Y0)
- WISE 0734−7157 (Y0)
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L. et al. (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal 753 (2): 156. doi:10.1088/0004-637X/753/2/156. Bibcode: 2012ApJ...753..156K.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Faherty, Jacqueline K.; Burningham, Ben; Gagné, Jonathan; Suárez, Genaro; Vos, Johanna M.; Alejandro Merchan, Sherelyn; Morley, Caroline V.; Rowland, Melanie et al. (2024-04-17). "Methane emission from a cool brown dwarf" (in en). Nature 628 (8008): 511–514. doi:10.1038/s41586-024-07190-w. ISSN 1476-4687. PMID 38632480. Bibcode: 2024Natur.628..511F.
- ↑ 3.0 3.1 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. doi:10.1093/mnras/staf032. Bibcode: 2025MNRAS.537..419F.
- ↑ 4.0 4.1 Kirkpatrick, J. Davy et al. (December 2023). "The Initial Mass Function Based on the Full-sky 20-pc Census of ∼3,600 Stars and Brown Dwarfs" (in en). The Astrophysical Journal Supplement Series 271 (2): 55. doi:10.3847/1538-4365/ad24e2. Bibcode: 2024ApJS..271...55K.
- ↑ 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. doi:10.1088/0004-637X/783/2/68. Bibcode: 2014ApJ...783...68B.
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