WISE 2056+1459 was discovered in 2011 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. WISE 2056+1459 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.[1][4]
Cushing et al. presented discovery of seven brown dwarfs — one of T9.5 type, and six of Y-type — first members of the Y spectral class, ever discovered and spectroscopically confirmed, including "archetypal member" of the Y spectral class
WISE 1828+2650, and WISE 2056+1459.[4] These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).[1]
Distance
Currently the most accurate distance estimate of WISE 2056+1459 is a
trigonometric parallax, published in 2021 by Kirkpatrick et al.: 140.8±2.0
mas, corresponding to a distance 7.1±0.1
pc, or 23.2±0.3
ly.[3]
Space motion
WISE 2056+1459 has a proper motion of 980.6±1.1 milliarcseconds per year.[3]
Physical properties
The object's temperature estimate is 464±88
K.[3] The object was observed with
Gemini GMOS. The researchers used the archived spectrum from Cushing et al. and the new spectrum in this work. The cloudy model included cloud decks of
sulfide and
chloride condensates. The model did fit the spectra well except for some parts due to the model not including the atmospheric mixing of
ammonia (NH3) and lines of
methane (CH4) missing in the model.[5] WISE 2056+1459 was also observed with
NIRSpec and the
Mid-Infrared Instrument. An excellent fit between spectrum and model was produced with a
phosphine-free and
diabatic model using an
effective temperature of 450 Kevlin and a
surface gravity of log g = 4.0. These values correspond to a 300
Myr object with a mass of 5
MJ. The researchers also found a medium probability (47%) of this object belonging to the Carina-Near group of stars. [6]
^These 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: six discoveries were published earlier (however, also listed in Kirkpatrick et al. (2011)) in Mainzer et al. (2011) and Burgasser et al. (2011), and the other discoveries were published later.
References
^
abcdefghijklmnopKirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, Amy K.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E.; Petty, Sara M.; Stanford, Spencer Adam; Tsai, Chao-Wei; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Bochanski, John J.; Burgasser, Adam J.; Capak, Peter L.; Cruz, Kelle L.; Hinz, Philip M.; Kartaltepe, Jeyhan S.; Knox, Russell P.; Manohar, Swarnima; Masters, Daniel; Morales-Calderon, Maria; Prato, Lisa A.; Rodigas, Timothy J.; Salvato, Mara; Schurr, Steven D.; Scoville, Nicholas Z.; Simcoe, Robert A.; Stapelfeldt, Karl R.; Stern, Daniel; Stock, Nathan D.; Vacca, William D. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement. 197 (2): 19.
arXiv:1108.4677v1.
Bibcode:
2011ApJS..197...19K.
doi:
10.1088/0067-0049/197/2/19.
S2CID16850733.
^
abKirkpatrick, 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.
S2CID119279752.
^
abcdefgCushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Mainzer, A.; Marsh, Kenneth A.; Beichman, Charles A.; Burgasser, Adam J.; Prato, Lisa A.; Simcoe, Robert A.; Marley, Mark S.; Saumon, D.; Freedman, Richard S.; Eisenhardt, Peter R.; Wright, Edward L. (2011). "The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal. 743 (1): 50.
arXiv:1108.4678.
Bibcode:
2011ApJ...743...50C.
doi:
10.1088/0004-637X/743/1/50.
S2CID286881.