2MASS J11145133-2618235

2MASS J11145133-2618235

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
Distance 18.2 ± 0.1 ly
(5.58 ± 0.04 pc)
Details
Mass 0.029–0.048[4] M
Mass 30–50[4] MJup
Surface gravity (log g) 5.0–5.3[4] cgs
Temperature 725–775[4] K
Metallicity -0.3 ± 0.1 [m/H][4]
Age 3–8[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
SIMBAD data

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]

Contents

  • Discovery 1
  • Distance 2
  • Proper motion 3
  • See also 4
  • Notes 5
  • References 6

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 1114-2618 distance estimates
Source Parallax, mas Distance, pc Distance, ly Ref.
Tinney et al. (2005) ~7 ~22.8 [2]
Kirkpatrick et al. (2012) ~152 ~6.6 ~21.5 [8]
Faherty et al. (2012) 176.8 ± 7.0 5.66 ± 0.23 18.45 ± 0.76 [6]
Dupuy & Liu (2012) 179.2 ± 1.4 5.58 ± 0.04 18.20 ± 0.14 [7]

Non-trigonometric distance estimates are marked in italic. The best 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 1114-2618 proper motion estimates

Source μ,
mas/yr
P. A.,
°
μRA,
mas/yr
μDEC,
mas/yr
Ref.
Faherty et al. (2012) 2927.2 165.8 -2927.2 ± 7.0 -374.2 ± 7.2 [6]
Dupuy & Liu (2012) 3043.2 ± 1.1 262.75 ± 0.03 -3018.8 ± 1.1 -384.1 ± 1.4 [7]

The best estimates are marked in bold.

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. ^ a b c d e "2MASS J11145133-2618235 -- Brown Dwarf (M<0.08solMass)".  
  2. ^ a b c d e f g h i j k l 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".  
  3. ^ a b c d e f g 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".  
  4. ^ a b c d e f g h i j 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".  
  5. ^ a b c d 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".  
  6. ^ a b c d e f g h i 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".  
  7. ^ a b c d e f g h i j
  8. ^ a b c  
  9. ^ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition".