WISEPC J205628.90+145953.3

WISE 2056+1459 (full designation WISEPC J205628.90+145953.3) is a brown dwarf of spectral class Y0,[1][2] located in constellation Delphinus at approximately 23.2 light-years from Earth.[3]

WISEPC J205628.90+145953.3

WISE 2056+1459
Credit: unWISE
Observation data
Epoch MJD 55511.01[1]      Equinox J2000[1]
Constellation Delphinus
Right ascension 20h 56m 28.88s[1]
Declination 14° 59′ 53.68″[1]
Characteristics
Spectral type Y0[1][2]
Apparent magnitude (J (2MASS filter system)) >17.6[1]
Apparent magnitude (J (MKO filter system)) 19.21 ± 0.07[1]
Apparent magnitude (H (2MASS filter system)) >17.1[1]
Apparent magnitude (H (MKO filter system)) 19.56 ± 0.18[1]
Astrometry
Proper motion (μ) RA: 825.8±0.8 mas/yr[3]
Dec.: 528.8±0.8 mas/yr[3]
Parallax (π)140.8 ± 2.0 mas[3]
Distance23.2 ± 0.3 ly
(7.1 ± 0.1 pc)
Details
Mass20 (12–30)[4] MJup
Radius0.93 (0.86–1.01)[4] RJup
Surface gravity (log g)4.75 (4.5–5.0)[4] cgs
Temperature464±88[3] K
Other designations
WISEPC J205628.90+145953.3[1]
WISEPC J2056+1459[4]
WISE J2056+1459[1]
WISE 2056+1459[1]
Database references
SIMBADdata

History of observations

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Discovery

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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]

  • Kirkpatrick et al. presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 2056+1459.[1][~ 1]
  • 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

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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

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WISE 2056+1459 has a proper motion of 980.6±1.1 milliarcseconds per year.[3]

Physical properties

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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]

See also

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Lists:

The other six discoveries of brown dwarfs, published in Cushing et al. (2011):[4]

Notes

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  1. ^ 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

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  1. ^ a b c d e f g h i j k l m n o p Kirkpatrick, 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. S2CID 16850733.
  2. ^ a b 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.
  3. ^ a b c d e f g Kirkpatrick, J. Davy; Gelino, Christopher R.; et al. (March 2021). "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. S2CID 227126954.
  4. ^ a b c d e f g Cushing, 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. S2CID 286881.
  5. ^ Leggett, S. K.; Morley, Caroline V.; Marley, M. S.; Saumon, D.; Fortney, Jonathan J.; Visscher, Channon (2013-02-01). "A Comparison of Near-infrared Photometry and Spectra for Y Dwarfs with a New Generation of Cool Cloudy Models". The Astrophysical Journal. 763: 130. arXiv:1212.1210. Bibcode:2013ApJ...763..130L. doi:10.1088/0004-637X/763/2/130. ISSN 0004-637X.
  6. ^ Leggett, S. K.; Tremblin, Pascal (2024-01-01). "James Webb Space Telescope Spectra of Cold Brown Dwarfs are Well-reproduced by Phosphine-free, Diabatic, ATMO2020++ Models". Research Notes of the American Astronomical Society. 8 (1): 13. Bibcode:2024RNAAS...8...13L. doi:10.3847/2515-5172/ad1b61. ISSN 2515-5172.