2MASS J11145133-2618235

Coordinates: 11h 14m 51.337s, −26° 18′ 23.56″

2MASS J11145133-2618235
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Hydra
Right ascension 11h 14m 51.337s[1]
Declination −26° 18′ 23.56″[1]
Characteristics
Spectral type T7.5[2][3][4][5][6]
Apparent magnitude (i (GMOS filter system)) 23.21 ± 0.09[5]
Apparent magnitude (z (GMOS filter system)) 19.59 ± 0.04[5]
Apparent magnitude (J (2MASS filter system)) >15.86 ± 0.08[2][3]
Apparent magnitude (J (MKO filter system)) 15.52 ± 0.05[6]
Apparent magnitude (H (2MASS filter system)) >15.73 ± 0.12[3]
Apparent magnitude (H (MKO filter system)) 15.82 ± 0.05[6]
Apparent magnitude (KS (2MASS filter system)) >16.1[3]
Apparent magnitude (KS (MKO filter system)) 16.54 ± 0.05[6]
Astrometry
Proper motion (μ) RA: -3018.8 ± 1.1[7] mas/yr
Dec.: -384.1 ± 1.4[7] mas/yr
Parallax (π)179.2 ± 1.4[7] mas
Distance18.2 ± 0.1 ly
(5.58 ± 0.04 pc)
Details
Mass0.029–0.048[4] M☉
Mass30–50[4] MJup
Surface gravity (log g)5.0–5.3[4] cgs
Temperature725–775[4] K
Metallicity-0.3 ± 0.1 [m/H][4]
Age3–8[4] Gyr
Other designations
2MASS J11145133-2618235,[1][2]
2MASS 1114-2618,[3]
2M1114-26,[2]
2M1114-2618,[2]
2MASS 1114-26,[4]
2MASS J1114-2618,[6]
WISE J111448.79−261827.7[8]
Database references
SIMBADdata

2MASS J11145133-2618235 (designation abbreviated to 2MASS 1114-2618,[3] or 2M1114-26,[2] or 2M1114-2618,[2] or 2MASS 1114-26,[4] or 2MASS J1114-2618[6]) is nearby brown dwarf of spectral class T7.5,[2][3][4][5][6] located in constellation Hydra[note 1] at approximately 18 light-years from Earth.[7]

Discovery

2MASS 1114-2618 was discovered in 2005 by C. G. Tinney et al. from the 2MASS Wide-Field T Dwarf Search (WFTS), based on observations obtained at the Anglo-Australian Telescope, Siding Spring, Australia. In 2005 Tinney et al. published a paper in The Astronomical Journal, where they presented discovery of five new brown dwarfs of spectral type T, among which also was 2MASS 1114-2618.[2]

Distance

Trigonometric parallax of 2MASS 1114-2618, measured in 2012 by Dupuy & Liu under The Hawaii Infrared Parallax Program, is 0.1792 ± 0.0014 arcsec, corresponding to a distance 5.58 ± 0.04 pc, or 18.20 ± 0.14 ly.[7]

Photometric distance estimate of 2MASS 1114-2618, published in its discovery paper in 2005, is 7 pc (22.8 ly).[2] Spectrophotometric distance estimate by Kirkpatrick et al. (2012), is 6.6 pc (21.5 ly).[8]

2MASS J11145133-2618235 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Tinney et al. (2005) ~ 7 ~ 22.8 ~ 216 [2]
Kirkpatrick et al. (2012) ~ 152 ~ 6.6 ~ 21.5 ~ 203 [8]
Faherty et al. (2012) 176.8±7.0 5.66+0.23
−0.22		 18.4+0.8
−0.7		 174.5+7.2
−6.6		 [6]
Dupuy & Liu (2012) 179.2±1.4 5.58±0.04 18.2±0.14 172.2+1.4
−1.3		 [7]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

Proper motion

2MASS 1114-2618 has quite a large proper motion of 3043.2 mas/yr with position angle 262.75 degrees,[7] indicating motion in south-west direction on the sky. At distance 18.20 ly (assuming parallax 179.2 ± 1.4 mas),[7] corresponding tangential velocity is 80.56 km/s.[7]

2MASS J11145133-2618235 proper motion estimates

Source μ, mas/yr P. A., ° μRA, mas/yr μDEC, mas/yr Ref.
Faherty et al. (2012)2951 ± 8262.72 ± 0.16−2927.2 ± 7.0−374.2 ± 7.2[6]
Dupuy & Liu (2012)3043.2 ± 1.1262.75 ± 0.03−3018.8 ± 1.1−384.1 ± 1.4[7]

The most accurate estimates are marked in bold. Italic are computed values, not italic are values, given in the sources.

See also

The other four discoveries of brown dwarfs, presented in Tinney et al. (2005):[2]

Notes

  1. ↑ The nearest known star/brown dwarf in this constellation.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "2MASS J11145133-2618235 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-07-26.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 Tinney, C. G.; Burgasser, Adam J.; Kirkpatrick, J. Davy; McElwain, Michael W. (2005). "The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging". The Astronomical Journal 130 (5): 2326–2346. arXiv:astro-ph/0508150. Bibcode:2005AJ....130.2326T. doi:10.1086/491734.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Burgasser, A. J.; Geballe, T. R.; Leggett, S. K.; Kirkpatrick, J. Davy; Golimowski, David A. (2006). "A Unified Near-Infrared Spectral Classification Scheme for T Dwarfs". The Astrophysical Journal 637 (2): 1067–1093. arXiv:astro-ph/0510090. Bibcode:2006ApJ...637.1067B. doi:10.1086/498563.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Leggett, S. K.; Marley, M. S.; Freedman, R.; Saumon, D.; Liu, Michael C.; Geballe, T. R.; Golimowski, D. A.; Stephens, D. C. (2007). "Physical and Spectral Characteristics of the T8 and Later Type Dwarfs". The Astrophysical Journal 667 (1): 537–548. arXiv:0705.2602. Bibcode:2007ApJ...667..537L. doi:10.1086/519948.
  5. ↑ 5.0 5.1 5.2 5.3 Leggett, S. K.; Saumon, D.; Marley, M. S.; Lodders, K.; Canty, J.; Lucas, P.; Smart, R. L.; Tinney, C. G.; Homeier, D.; Allard, F.; Burningham, Ben; Day-Jones, A.; Fegley, B.; Ishii, Miki; Jones, H. R. A.; Marocco, F.; Pinfield, D. J.; Tamura, M. (2012). "The Properties of the 500 K Dwarf UGPS J072227.51-054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs". The Astrophysical Journal 748 (2): 74. arXiv:1201.2973. Bibcode:2012ApJ...748...74L. doi:10.1088/0004-637X/748/2/74.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement 201 (2): 19. arXiv:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19.
  8. ↑ 8.0 8.1 8.2 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.