2MASS J21265040−8140293
| 2MASS J21265040−8140293 | |
|---|---|
|
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|
| Constellation | Octane |
| Right ascension | 21 h 26 m 50.4 s |
| declination | −81 ° 40 ′ 29 ″ |
| Astrometry | |
| distance | 31.9 +2.9−2.4 pc |
| Radial velocity | 8.4 ± 2.1 km / s |
| Proper movement : | |
| in right ascension: | μ α cos (δ) = 49.3 ± 9.7 mas / a |
| in declination: | μ δ = −105.5 ± 6.6 mas / a |
| properties | |
| Apparent brightness | J-band: 15.54 ± 0.06 mag |
| Spectral type | L3γ |
| Estimation of mass range | 11.6 to 15.0 M y |
| Estimation of the age range | 10 to 150 mill. A |
2MASS J21265040−8140293 , 2MASS J2126−8140 for short , is a substellar object and an astrometric companion of the red dwarf TYC 9486-927-1 in the constellation Octane, about 100 light years away . The two objects have a common proper movement and are separated in the sky by 217 ″, which when projected corresponds to around 6900 AU . Estimating its mass makes 2MASS J2126−8140 an exoplanet candidate.
Research history
2MASS J2126−8140 was initially identified as a brown dwarf of the spectral class L3, which belongs to the Tucana-Horologium Association , which consists of very young (about 45 million years old) stars.
A working group led by Niall R. Deacon of the University of Hertfordshire in the UK determined, inter alia, from recent observations of the proper motion a joint movement of 2MASS J2126-8140 with TYC 9486-927-1 in the room, which is probably explained by a gravitational binding. In early 2016, they published the results of their research. 2MASS J2126−8140 is therefore seen as a companion of possibly planetary mass that orbits TYC 9486-927-1 at an extreme distance of around 7000 AU.
properties
The mass of 2MASS J2126−8140 is estimated to be 11.6 to 15 Jupiter masses and thus moves in the border area between a massive gas planet and a cool brown dwarf. The age of the central star and thus also of its companion is probably 10 to 45 million years. The system of TYC 9486-927-1 and 2MASS J2126−8140 thus resembles Beta Pictoris , which also has a massive planetary companion. The central star probably also belongs to the Beta Pictoris motion cluster . According to the model calculations, 2MASS J2126−8140 has a temperature of around 1800 Kelvin .
literature
- Deacon, Niall R .; Schlieder, Joshua E .; Murphy, Simon J .: "A nearby young M dwarf with a wide, possibly planetary-mass companion" (arXiv); accepted for publication in MNRAS
Individual evidence
- ↑ SIMBAD: 2MASS J21265040-8140293. Retrieved January 27, 2016 .
- ↑ a b c d e Stars and Space from January 26, 2016: Planetary long-distance relationship. Retrieved August 14, 2015 .