WISE 2220−3628

WISE J222055.31−362817.4

WISE 2220-3628
Credit: NASA/ESA/CSA JWST MIRI
Observation data
Epoch J2000[1]      Equinox J2000[1]
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 velocity55.33±2.82[2] km/s
Proper motion (μ) RA: 288.92 ±0.15 mas/yr[3]
Dec.: −97.10 ±0.16 mas/yr[3]
Parallax (π)93.50 ± 1.02 mas[3]
Distance34.9 ± 0.4 ly
(10.7 ± 0.1 pc)
Details
Mass6-35[2] MJup
Radius0.94±0.14[2] RJup
Surface gravity (log g)4.7±0.5[2] cgs
Temperature480±41[2] K
Age4.5±4.0[2] Gyr
Other designations
WISE J222055.31−362817.4,[1]
WISE 2220−3628[1]
Database references
SIMBADdata

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

References

  1. ^ a b c d e f g h i j k l Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amy K.; Burgasser, Adam J.; Tinney, Chris G.; Parker, Stephen; Salter, Graeme (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. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. S2CID 119279752.
  2. ^ a b c d e f g h Faherty, Jacqueline K.; Burningham, Ben; Gagné, Jonathan; Suárez, Genaro; Vos, Johanna M.; Alejandro Merchan, Sherelyn; Morley, Caroline V.; Rowland, Melanie; Lacy, Brianna; Kiman, Rocio; Caselden, Dan; Kirkpatrick, J. Davy; Meisner, Aaron; Schneider, Adam C.; Kuchner, Marc Jason; Bardalez Gagliuffi, Daniella Carolina; Beichman, Charles; Eisenhardt, Peter; Gelino, Christopher R.; Gharib-Nezhad, Ehsan; Gonzales, Eileen; Marocco, Federico; Rothermich, Austin James; Whiteford, Niall (2024-04-17). "Methane emission from a cool brown dwarf". Nature. 628 (8008): 511–514. arXiv:2404.10977. doi:10.1038/s41586-024-07190-w. ISSN 1476-4687.
  3. ^ a b 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". arXiv:2412.16679 [astro-ph].
  4. ^ a b 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". The Astrophysical Journal Supplement Series. arXiv:2312.03639. Bibcode:2023arXiv231203639K.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  5. ^ 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.

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