Jump to content

ChaHα8

From Wikipedia, the free encyclopedia
(Redirected from Cha Hα 8)
ChaHα8

ChaHα8 with the Spitzer Space Telescope
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 11h 07m 46.091s[1]
Declination −77° 40′ 08.92″[1]
Apparent magnitude (V) 20.1[2]
Characteristics
Spectral type M5.75–M6.5[3]
Astrometry
Proper motion (μ) RA: -23.455 mas/yr[1]
Dec.: 0.453 mas/yr[1]
Parallax (π)5.0899 ± 0.0792 mas[1]
Distance641 ± 10 ly
(196 ± 3 pc)
Orbit[4]
Period (P)1895±132 d
Semi-major axis (a)1.02±0.061.17±0.07 AU
Eccentricity (e)0.59±0.22
Periastron epoch (T)2453163±214 JD
Argument of periastron (ω)
(secondary)
106±26°
Semi-amplitude (K1)
(primary)
2.433±0.44 km/s
Details
ChaHα8 A
Mass0.07–0.10[3] M
Temperature2910–3024[3] K
Rotational velocity (v sin i)15.5±2.6[3] km/s
Age~3[3] Myr
ChaHα8 B
Mass25±731±8[4] MJup
Other designations
2MASS J11074610-7740089, CHSM 10837, SBC9 3352, Cha Hα 8[2]
Database references
SIMBADdata

ChaHα8 (also written ChaHa8 when Greek letters are unavailable) is a binary brown dwarf about 640 light-years (200 parsecs) from Earth in the constellation Chamaeleon. The designation indicates that it is in the Chamaeleon I star-forming region and that it displays hydrogen-alpha emission. It was discovered in 2000.[5]

It was found in 2007 to have a low-mass substellar companion in orbit around it via radial velocity observations.[3] The companion has a mass of 25–31 Jupiter masses, and the pair orbit each other with a period of 5.2 years and an eccentricity of 0.59.[4]

References

[edit]
  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b "CHSM 10837". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 November 2016.
  3. ^ a b c d e f Joergens, V.; A. Mueller (2007). "16–20 Jupiter mass RV companion orbiting the brown dwarf candidate ChaHa8". The Astrophysical Journal. 666 (2). arXiv:0707.3744. Bibcode:2007ApJ...666L.113J. doi:10.1086/521825. S2CID 119140521.
  4. ^ a b c Joergens, V.; Müller, A.; Reffert, S. (2010). "Improved radial velocity orbit of the young binary brown dwarf candidate Cha Hα 8". Astronomy and Astrophysics. 521 (A24): A24. arXiv:1006.2383. Bibcode:2010A&A...521A..24J. doi:10.1051/0004-6361/201014853. S2CID 54989533.
  5. ^ Comerón, F.; Neuhäuser, R.; Kaas, A. A. (2000). "Probing the brown dwarf population of the Chamaeleon I star forming region". Astronomy and Astrophysics. 359: 269–288. Bibcode:2000A&A...359..269C.
[edit]