WISEPA J231336.40-803700.3
Coordinates: 
23h 13m 36.45s, −80° 37′ 00.7″
| Observation data Epoch MJD 55480.40[1] Equinox J2000[1] |
|
|---|---|
| Constellation | Octans |
| Right ascension | 23h 13m 36.45s[1] |
| Declination | -80° 37′ 00.7″[1] |
| Characteristics | |
| Spectral type | T8[2][1][3] |
| Apparent magnitude (J (2MASS filter system)) | 16.974 ± 0.236[1] |
| Apparent magnitude (H (2MASS filter system)) | >16.192[1] |
| Apparent magnitude (KS (2MASS filter system)) | >16.358[1] |
| Astrometry | |
| Proper motion (μ) | RA: 237 ± 24[1] mas/yr Dec.: -401 ± 28[1] mas/yr |
| Distance | ~ 35.9[3] ly (~ 11.0[3] pc) |
| Details | |
| Mass | 7 ± 3[2] MJup |
| Surface gravity (log g) | 4.0 ± 0.3[2] |
| Temperature | 600 ± 30[2] K |
| Age | 0.3 ± 0.4[2] Gyr |
| Other designations | |
WISEPA J231336.40-803700.3 (designation abbreviated to WISE 2313-8037, or WISE J2313-8037) is a brown dwarf of spectral class T8,[2][1][3] located in constellation Octans at approximately 36 light-years from Earth.[3]
Contents |
Discovery [edit]
WISE 2313-8037 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 2313-8037 has a faint counterpart in the 2MASS Reject Catalog (detection grade of "E").[2] On 2010 September 20 (UT) Burgasser et al. had conducted follow-up observations (spectroscopy) of WISE 2313-8037 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 2313-8037.[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 2313-8037 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).
WISE 2313-8037 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Burgasser et al. (2011) (photometric) |
11.7 ± 1.6 | 38.2 ± 5.2 | [2] | |
| Burgasser et al. (2011) (spectral model fit) |
9.3 ± 0.4 | 30.3 ± 1.3 | [2] | |
| Kirkpatrick et al. (2011) | ~11.2 | ~36.5 | [1] | |
| Kirkpatrick et al. (2012) | ~11.0 | ~35.9 | [3] |
Non-trigonometric distance estimates are marked in italic.
Space motion [edit]
WISE 2313-8037 has proper motion of about 466 milliarcseconds per year.[1]
WISE 2313-8037 proper motion estimates
| Source | μ, mas/yr |
P. A., ° |
μRA, mas/yr |
μDEC, mas/yr |
Ref. |
|---|---|---|---|---|---|
| Burgasser et al. (2011) | 552 | 154 | 242 ± 32 | -496 ± 29 | [2] |
| Kirkpatrick et al. (2011) | 466 | 149 | 237 ± 24 | -401 ± 28 | [1] |
The most accurate estimates are marked in bold.
Clouds and young age [edit]
According its discovery paper, WISE 2313-8037 is a cloudy and young brown dwarf of age about 0.3 (0 to 0.7) Gyr.[2]
Properties of WISE 2313-8037 as well as other similar objects may indicate a trend that younger brown dwarf have cloudier atmospheres.[2]
See also [edit]
The other five earliest brown dwarf discoveries from data collected by WISE:
- published by Mainzer et al. (2011):[4]
- WISE 0458+6434 (T8.5 + T9.5 binary)
- published by Burgasser et al. (2011):[2]
- WISE 1617+1807 (T8, also young and cloudy)
- WISE 1812+2721 (T8.5:, cloudless)
- WISE 2018-7423 (T7, possibly cloudy)
- WISE 2359-7335 (T5.5, cloudless)
References [edit]
- ^ a b c d e f g h i j k l m n o p q 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.
- ^ a b c d e f g h i j k l m n 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.
- ^ a b c d e f 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, Amanda K.; Burgasser, Adam J.; Tinney, C. 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.
- ^ 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.
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