WISEPA J201824.96-742325.9

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Coordinates: Sky map 20h 18m 25s, −74° 23′ 27.99″

WISEPA J201824.96-742325.9
Observation data
Epoch MJD 55471.93[1]      Equinox J2000[1]
Constellation Pavo
Right ascension 20h 18m 25s[1]
Declination −74° 23′ 27.99″[1]
Characteristics
Spectral type T7[2][1][3]
Apparent magnitude (J (2MASS filter system)) 17.11 ± 0.21[2]
Apparent magnitude (H (2MASS filter system)) >16.5[2]
Apparent magnitude (KS (2MASS filter system)) >16.6[2]
Astrometry
Proper motion (μ) RA: 311 ± 32[2] mas/yr
Dec.: −852 ± 31[2] mas/yr
Distance ~ 47.9[3] ly
(~ 14.7[3] pc)
Details
Mass 50 ± 9[2] MJup
Surface gravity (log g) 5.4 ± 0.3[2] cgs
Temperature 710+50
−60
[2] K
Age 10 ± 4[2] Gyr
Other designations
WISEPA J201824.96-742325.9[1]
WISE J2018-7423[1]

WISEPA J201824.96-742325.9 (designation abbreviated to WISE 2018-7423, or WISE J2018-7423) is a brown dwarf of spectral class T7,[2][1][3] located in constellation Pavo at approximately 48 light-years from Earth.[3]

Discovery[edit]

WISE 2018-7423 was discovered in 2011 by Burgasser 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. However, WISE 2018-7423 has a faint counterpart in the 2MASS Reject Catalog (detection grade of "C").[2] On 2010 September 20 (UT) Burgasser et al. had conducted follow-up observations (spectroscopy) of WISE 2018-7423 with the FIRE spectrograph mounted on the Magellan 6.5 m Baade Telescope located at Las Campanas Observatory in Chile. In 2011 Burgasser et al. published a paper in The Astrophysical Journal, where they presented discovery of five new found by WISE brown dwarfs, including WISE 2018-7423.[2] Also, this is one of six earliest brown dwarf discoveries from data, collected by WISE, — published before Kirkpatrick et al. (2011)[1]

Distance[edit]

Trigonometric parallax of WISE 2018-7423 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).

WISE 2018-7423 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Burgasser et al. (2011)
(photometric)
13.1 ± 1.4 42.7 ± 4.6 [2]
Burgasser et al. (2011)
(spectral model fit)
12.2 ± 2.3 39.8 ± 7.5 [2]
Kirkpatrick et al. (2011) ~13.3 ~43.4 [1]
Kirkpatrick et al. (2012) ~14.7 ~47.9 [3]

Non-trigonometric distance estimates are marked in italic.

Space motion[edit]

WISE 2018-7423 has proper motion of about 907 milliarcseconds per year.[2]

WISE 2018-7423 proper motion estimates

Source μ,
mas/yr
P. A.,
°
μRA,
mas/yr
μDEC,
mas/yr
Ref.
Burgasser et al. (2011) 907 160 311 ± 32 −852 ± 31 [2]
Kirkpatrick et al. (2011) 882 149 455 ± 312 -756 ± 323 [1]

The most accurate estimates are marked in bold.

Possible clouds[edit]

According its discovery paper, WISE 2018-7423 is a possibly cloudy brown dwarf.[2]

Old age[edit]

WISE 2018-7423 is relatively old (age ≳ 6 Gyr).[2]

Blue near-infrared color[edit]

WISE 2018-7423 has an unusually blue spectrophotometric near-infrared color (J−K = −0.54 ± 0.10).[2]

See also[edit]

The other five earliest brown dwarf discoveries from data collected by WISE:

References[edit]

  1. ^ a b c d e f g h i j k Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, A.; 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, S. A.; 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.  edit
  2. ^ a b c d e f g h i j k l m n o p q r s t u Burgasser, Adam J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Looper, Dagny L.; Tinney, Christopher; Simcoe, Robert A.; Bochanski, John J.; Skrutskie, Michael F.; Mainzer, A.; Thompson, Maggie A.; Marsh, Kenneth A.; Bauer, James M.; Wright, Edward L. (2011). "Fire Spectroscopy of Five Late-type T Dwarfs Discovered with the Wide-field Infrared Survey Explorer". The Astrophysical Journal 735 (2): 116. arXiv:1104.2537. Bibcode:2011ApJ...735..116B. doi:10.1088/0004-637X/735/2/116.  edit
  3. ^ a b c d e f Kirkpatrick, J. D.; Gelino, C. R.; Cushing, M. C.; Mace, G. N.; Griffith, R. L.; Skrutskie, M. F.; Marsh, K. A.; Wright, E. L.; Eisenhardt, P. R.; McLean, I. S.; Mainzer, A. K.; Burgasser, A. J.; Tinney, C. G.; Parker, S.; Salter, G. (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.  edit
  4. ^ Mainzer, A.; Cushing, Michael C.; Skrutskie, M.; Gelino, C. R.; Kirkpatrick, J. Davy; Jarrett, T.; Masci, F.; Marley, Mark S.; Saumon, D.; Wright, E.; Beaton, R.; Dietrich, M.; Eisenhardt, P.; Garnavich, P.; Kuhn, O.; Leisawitz, D.; Marsh, K.; McLean, I.; Padgett, D.; Rueff, K. (2011). "The First Ultra-cool Brown Dwarf Discovered by the Wide-field Infrared Survey Explorer". The Astrophysical Journal 726 (1): 30. arXiv:1011.2279. Bibcode:2011ApJ...726...30M. doi:10.1088/0004-637X/726/1/30.  edit