Astronomy:2MASS J02431371−2453298
Coordinates: 
02h 43m 13.72s, −24° 53′ 29.8″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 43m 13.72s[1] |
| Declination | −24° 53′ 29.8″[1] |
| Characteristics | |
| Spectral type | T6 |
| Apparent magnitude (J) | 15.38 ± 0.05[1] |
| Apparent magnitude (H) | 15.137 ± 0.109[1] |
| Apparent magnitude (K) | 15.216 ± 0.168[1] |
| Astrometry | |
| Proper motion (μ) | RA: -288 ± 4[1] mas/yr Dec.: -208 ± 3[1] mas/yr |
| Parallax (π) | 93.46 ± 3.49[2] mas |
| Distance | 35 ± 1 ly (10.7 ± 0.4 pc) |
| Details | |
| Mass | 0.024-0.041 M☉ |
| Radius | 0.092-0.106 R☉ |
| Temperature | 800–1300 K |
| Age | 0.4-1.7 billion years |
| Other designations | |
| Database references | |
| SIMBAD | data |
2MASS J02431371−2453298 (abbreviated to 2MASS 0243−2453) is a brown dwarf of spectral class T6,[3][1] located in the constellation Fornax about 34.84 light-years from Earth.[4]
Discovery
2MASS 0243−2453 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998–2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0243-2453. These 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and the discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[3]
Distance
2MASS J02431371−2453298 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Vrba et al. (2004) | 93.62±3.63 | 10.68±0.41 | 34.84±1.35 | [4] |
| Manjavacas et al. (2018) | 93.46±3.49 | 10.7±0.4 | 34.9±1.3 | [2] |
Space motion
Position of 2MASS 0243-2453 shifts due to its proper motion by 0.3548 arcseconds per year.
Properties
Using an evolutionary model, the surface temperature of 2MASS 0243−2453 is estimated to be 1040–1100 K, and its mass is estimated at 2.4–4.1% that of the Sun, its diameter 0.092 to 0.106 that of the Sun, and age 0.4–1.7 billion years.[5]
As with other brown dwarfs of spectral type T, its spectrum is dominated of methane. Like mant of other T-class brown dwarf, 2MASS J0243−2453 does not exhibit any optical variability, indicating its upper atmosphere is free of clouds.[6]
See also
The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]
- 2MASS 0415−0935 (T8)
- 2MASS 0727+1710 (T7)
- 2MASS 0755+2212 (T5)
- 2MASS 0937+2931 (T6)
- 2MASS 1534−2952 (T5.5)
- 2MASS 1546-3325 (T5.5)
- 2MASS 1553+1532 (T7)
- 2MASS 2254+3123 (T5)
- 2MASS 2339+1352 (T5.5)
- 2MASS 2356−1553 (T6)
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "2MASS J02431371-2453298 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J02431371-2453298. Retrieved 2012-11-26.
- ↑ 2.0 2.1 Manjavacas, Elena; Apai, Dániel; Zhou, Yifan; Lew, Ben W. P.; Schneider, Glenn; Metchev, Stan; Miles-Páez, Paulo A.; Radigan, Jacqueline et al. (2018), "Cloud Atlas: Hubble Space Telescope Near-infrared Spectral Library of Brown Dwarfs, Planetary-mass Companions, and Hot Jupiters", The Astronomical Journal 157 (3): 101, doi:10.3847/1538-3881/aaf88f
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Burgasser, Adam J.; Kirkpatrick, J. Davy; Brown, Michael E.; Reid, I. Neill; Burrows, Adam; Liebert, James; Matthews, Keith; Gizis, John E. et al. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal 564 (1): 421–451. doi:10.1086/324033. Bibcode: 2002ApJ...564..421B.
- ↑ 4.0 4.1 Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, Adam J.; Kirkpatrick, J. Davy et al. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal 127 (5): 2948–2968. doi:10.1086/383554. Bibcode: 2004AJ....127.2948V.
- ↑ Burgasser, Adam J.; Burrows, Adam; Kirkpatrick, J. Davy (2006). "Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs". The Astrophysical Journal 639 (2): 1095–1113. doi:10.1086/499344. Bibcode: 2006ApJ...639.1095B.
- ↑ Radigan, Jacqueline; Lafrenière, David; Jayawardhana, Ray; Artigau, Étienne (2014), "Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs", The Astrophysical Journal 793 (2): 75, doi:10.1088/0004-637X/793/2/75, Bibcode: 2014ApJ...793...75R
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