Astronomy:DENIS J082303.1−491201
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
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
- ↑ 1.0 1.1 Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode: 2003yCat.2246....0C.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Sahlmann, J.; Burgasser, Adam J.; Martín, Eduardo L.; Lazorenko, P. F.; Bardalez Gagliuffi, D. C.; Mayor, M.; Ségransan, D.; Queloz, D. et al. (2015). "DE0823−49 is a juvenile binary brown dwarf at 20.7 pc". Astronomy & Astrophysics 579: A61. doi:10.1051/0004-6361/201425536. Bibcode: 2015A&A...579A..61S.
- ↑ 3.0 3.1 "2MASS J08230313-4912012". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J08230313-4912012.
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ Phan-Bao, Ngoc (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. doi:10.1111/j.1365-2966.2007.12564.x. Bibcode: 2008MNRAS.383..831P. http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?2008MNRAS.383..831P&classic=YES. Retrieved 1 June 2015..
- ↑ 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, doi:10.1051/0004-6361/201321871, Bibcode: 2013A&A...556A.133S
- ↑ "Exoplanet and candidate statistics". NASA Exoplanet Archive. http://exoplanetarchive.ipac.caltech.edu/docs/counts_detail.html.
- ↑ "Liste des exoplanètes découvertes par astrométrie". NASA Exoplanet Archive. http://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=planets&constraint=pl_discmethod+like+%27Astrometry%25%27.
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