WISE 1738+2732 was discovered in 2011 from data, collected by the
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 1738+2732 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 1738+2732.[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 1738+2732 is a
trigonometric parallax, published in 2021 by Kirkpatrick et al.: 130.9±2.1
mas, corresponding to a distance of 7.6±0.1
pc, or 24.9±0.4
ly.[3]
Space motion
WISE 1738+2732 has a proper motion of 481.2±1.1 milliarcseconds per year.[3]
Properties
The object's temperature estimate is 350 (350–400)
K.[4] Its spectrum is similar with spectrum of another Y-dwarf
WISE 1405+5534.
Disequilibrium chemistry models suggest that this Y-dwarf has a low mass of about 3-9
MJup, making it a possible
isolated planetary-mass object, together with
WISE 0350-5658.[5] A more recent paper finds a mass of 5-14 MJup.[6]
WISE 1405 is variable in the
near- and mid-infrared. The observations were made with the
Gemini Observatory and
Spitzer. It has a rotation period of 6.0±0.1 hours and the amplitude is 3% for 4.5 μm and may be as high as 5-30% in the near-infrared. This dependence on wavelength can be reproduced with
patchy cloud layers made up of
potassium chloride (KCl) and
sodium sulfide (Na2S).[7]
^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
^
abcdefghijklmnKirkpatrick, 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.