DENIS J082303.1−491201
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
Distance67.48 ± 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
Mass0.028−0.063 M☉
Luminosity0.00018 L☉
Temperature2150 ± 100 K
Age80–500 Myr
B
Mass0.018−0.045 M☉
Luminosity0.000063 L☉
Temperature1670 ± 140 K
Other designations
2MASS J08230313-4912012[3]
Database references
SIMBADdata

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.[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

A 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

  1. 1 2 Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 "2MASS J08230313-4912012". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2017.
  4. ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 19 September 2017.
  5. ↑ 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" (gif). 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. Retrieved 1 June 2015..
  6. ↑ 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
  7. ↑ "Exoplanet and candidate statistics". NASA Exoplanet Archive. Retrieved 1 June 2015.
  8. ↑ "Liste des exoplanètes découvertes par astrométrie". NASA Exoplanet Archive. Retrieved 1 June 2015.
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