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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 23m 03.13s[1] |
| Declination | −49° 12′ 01.3″[1] |
| Characteristics | |
| Spectral type | L1.5 + L5.5[2] |
| Apparent magnitude (R) | 20.020[3] |
| Astrometry | |
| Proper motion (μ) | RA: −154.92[2] mas/yr Dec.: 7.99[2] mas/yr |
| Distance | 67.48 ± 0.20 ly (20.69 ± 0.06[2] pc) |
| Orbit[4] | |
| 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[2] | |
| 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 | |
| Database references | |
| SIMBAD | data |
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.[2]
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.[2]
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.[5]
Planetary system
editA substellar companion, DENIS-P J082303.1−491201 b was discovered in 2013[6] and included in the NASA Exoplanet Archive as the first exoplanet discovered by the Astrometry exoplanet detection method.[7][8]
References
edit- ^ a b Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- ^ a b c d e f g 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.
- ^ a b "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.