| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08 23 03.13 |
| Declination | −49° 12′ 01.3″ |
| Characteristics | |
| Spectral type | L1.5 + L5.5 |
| Apparent magnitude (R) | 20.020 |
| Astrometry | |
| Proper motion (μ) | RA: −154.92 mas/yr Dec.: 7.99 mas/yr |
| Distance | 67.48 ± 0.20 ly (20.69 ± 0.06 pc) |
| Orbit | |
| Period (P) | 247.75 ± 0.64 d |
| Semi-major axis (a) | 4.62 ± 0.12 mas″ |
| Eccentricity (e) | 0.36 ± 0.04 |
| Inclination (i) | 52.2 ± 1.5° |
| Longitude of the node (Ω) | 346.2 ± 2.0° |
| Periastron epoch (T) | JD 2455927.323928 |
| Argument of periastron (ω) (secondary) | 41.8 ± 4.7° |
| Details | |
| A | |
| Mass | 0.028−0.063 M☉ |
| Luminosity | 0.00018 L☉ |
| Temperature | 2150 ± 100 K |
| Age | 80–500 Myr |
| B | |
| Mass | 0.018−0.045 M☉ |
| Luminosity | 0.000063 L☉ |
| Temperature | 1670 ± 140 K |
| Other designations | |
| 2MASS J08230313-4912012 | |
| Database references | |
| SIMBAD | data |
DENIS-P J082303.1-491201 (also known as DENIS J082303.1-491201, DE0823-49), is a binary system of two brown dwarfs, located 20.77 parsecs (67.7 ly) from Earth. The system is located in the constellation Vela.
The primary has a spectral class of L1.5, a mass of 0.028 to 0.063 M☉ and a temperature of 2,150 K (1,880 °C; 3,410 °F). The secondary is also a brown dwarf but with a spectral type of L5.5, a mass of 0.018 to 0.045 M☉, and a temperature of 1,670 K (1,400 °C; 2,550 °F). The mass ratio is around 0.64 to 0.74.
The system has an orbital period of 248 days. The age of the system is estimated to be around 80 to 500 million years old, a relatively young object in the solar neighbourhood, however it does not seem to have any association with any moving groups.
DENIS J082303.1-491201 was discovered in 2007 by Ngoc Phan-Bao et al as part of the Deep Near Infrared Survey of the Southern Sky or DENIS for short.
Planetary system
A substellar companion, DENIS-P J082303.1−491201 b was discovered in 2013 and included in the NASA Exoplanet Archive as the first exoplanet discovered by the Astrometry exoplanet detection method.
References
- ^ Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- ^ Sahlmann, J.; Burgasser, Adam J.; Martín, Eduardo L.; Lazorenko, P. F.; Bardalez Gagliuffi, D. C.; Mayor, M.; Ségransan, D.; Queloz, D.; Udry, S. (2015). "DE0823−49 is a juvenile binary brown dwarf at 20.7 pc". Astronomy & Astrophysics. 579: A61. arXiv:1505.07972. Bibcode:2015A&A...579A..61S. doi:10.1051/0004-6361/201425536. S2CID 119234915.
- ^ "2MASS J08230313-4912012". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2017.
- "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 19 September 2017.
- Phan-Bao, Ngoc; et al. (January 2008). "Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base". Monthly Notices of the Royal Astronomical Society. 383 (3): 831–844. arXiv:0708.4169. Bibcode:2008MNRAS.383..831P. doi:10.1111/j.1365-2966.2007.12564.x. S2CID 10555715..
- Sahlmann, J.; Lazorenko, P. F.; Ségransan, D.; Martín, Eduardo L.; Queloz, D.; Mayor, M.; Udry, S. (2013), "Astrometric orbit of a low-mass companion to an ultracool dwarf", Astronomy & Astrophysics, 556: A133, arXiv:1306.3225, Bibcode:2013A&A...556A.133S, doi:10.1051/0004-6361/201321871, S2CID 119193690
- "Exoplanet and candidate statistics". NASA Exoplanet Archive. Retrieved 1 June 2015.
- "Liste des exoplanètes découvertes par astrométrie". NASA Exoplanet Archive. Retrieved 1 June 2015.
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