Gliese 569

Gliese 569 is a ternary star system composed of a main-sequence star orbited by a pair of brown dwarfs in the constellation of Boötes about 32 light years away.

Gliese 569

An ultraviolet band light curve for a flare on CE Boötis, adapted from Hansen and Veeder (1977)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
A
Right ascension 14h 54m 29.2362s[2]
Declination +16° 06′ 03.798″[2]
Apparent magnitude (V) 10.15[3]
B
Right ascension 14h 54m 29.7686s[4]
Declination +16° 06′ 05.627″[4]
Characteristics
BD+16 2708A
Evolutionary stage main-sequence star
Spectral type M3
Apparent magnitude (g) 9.12[2]
Variable type Flare star[5]
BD+16 2708B
Spectral type M8.5+M9[6]
Apparent magnitude (g) 15.32[4]
Astrometry
A
Radial velocity (Rv)−8.00±0.17 km/s
Proper motion (μ) RA: +279.12±0.02 mas/yr[2]
Dec.: −117.91±0.02 mas/yr[2]
Parallax (π)100.5243 ± 0.0210 mas[2]
Distance32.446 ± 0.007 ly
(9.948 ± 0.002 pc)
Orbit[7]
PrimaryGJ 569Ba
CompanionGJ 569Bb
Period (P)863.7±4.2 d
Semi-major axis (a)0.89±0.02 AU
Eccentricity (e)0.312±0.007
Inclination (i)32.4±1.3°
Details[8]
Gliese 569A
Mass0.48 M☉
Radius0.43 R☉
Rotation14.7 d
Age<700[6] Myr
Gliese 569B
Mass0.081+0.059[9] M☉
Radius1.69+1.28 RJup
Temperature2000+2000[6] K
Rotational velocity (v sin i)19+6[6] km/s
Age<700[6] Myr
Other designations
Gliese 569, BD+16 2708, G 136-28, GSC 01478-00495, HIP 72944, 2MASS J14542923+1606039, TYC 1478-495-1, CE Boötis, WDS J14545+1606[10]
Database references
SIMBADdata
B

System

The primary star GJ 569A is orbited by the much fainter (3.7 magnitudes) secondary GJ 659B at a projected separation of 5.92 arcseconds, discovered in 1988.[11] The star GJ 569B (BD+16 2708B) itself is a close binary system of two high-mass brown dwarfs in a 2.4-year orbit,[12] and a small (0.538±0.048) magnitude difference between components.[13] The orbital plane of close binary GJ 569Ba and GJ 569Bb is expected to precess at timescales of about 100 thousand years due to the gravitational influence of GJ 569A.[6]

Properties

The primary star Gliese 569A is a flare star.[1] The nature of the brown dwarf binary Gliese 569B is highly uncertain, and it was even suspected Gliese 569Ba itself may be either a low-mass star or a binary object.[7] Both brown dwarfs are weakly variable, likely due to starspot activity.[12]

References
  1. Hansen, O. L.; Veeder, G. L. (June 1977), "Flare Activity on Gl 569", Information Bulletin on Variable Stars, 1292 (1): 1, Bibcode:1977IBVS.1292....1H
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. Koen, C.; et al. (April 21, 2010), "UBV(RI)CJHK observations of Hipparcos-selected nearby stars", Monthly Notices of the Royal Astronomical Society, 403 (4): 1949–1968, Bibcode:2010MNRAS.403.1949K, doi:10.1111/j.1365-2966.2009.16182.x
  4. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S
  6. Konopacky, Q. M.; Ghez, A. M.; Fabrycky, D. C.; MacIntosh, B. A.; White, R. J.; Barman, T. S.; Rice, E. L.; Hallinan, G.; Duchêne, G. (May 2012), "Rotational velocities of individual components in very low mass binaries", The Astrophysical Journal, 750 (1): 14, arXiv:1202.5555, Bibcode:2012ApJ...750...79K, doi:10.1088/0004-637X/750/1/79, S2CID 51026693
  7. Simon, M.; Bender, C.; Prato, L. (June 2006), "The Gl569 multiple system", The Astrophysical Journal, 644 (2): 1183–1192, arXiv:astro-ph/0603165, Bibcode:2006ApJ...644.1183S, doi:10.1086/503867, S2CID 3073217
  8. Lund, K.; Jardine, M.; Russell, A J B.; Donati, J-F; Fares, R.; Folsom, C. P.; Jeffers, S. V.; Marsden, S. C.; Morin, J.; Petit, P.; See, V. (April 2021), "Field linkage and magnetic helicity density", Monthly Notices of the Royal Astronomical Society, 502 (4): 4903–4910, arXiv:2102.11238, Bibcode:2021MNRAS.502.4903L, doi:10.1093/mnras/stab305
  9. Femenía, B.; Rebolo, R.; Pérez-Prieto, J. A.; Hildebrandt, S. R.; Labadie, L.; Pérez-Garrido, A.; Béjar, V. J. S.; Díaz-Sánchez, A.; Villó, I.; Oscoz, A.; López, R.; Rodríguez, L. F.; Piqueras, J. (May 2011), "Lucky imaging adaptive optics of the brown dwarf binary GJ569Bab", Monthly Notices of the Royal Astronomical Society, 413 (3): 1524–1536, arXiv:1012.4421, Bibcode:2011MNRAS.413.1524F, doi:10.1111/j.1365-2966.2011.18226.x, S2CID 55001061
  10. "BD+16 2708", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2021-11-09
  11. Forrest, Skrutskie and Shure (1988), "A possible brown dwarf companion to Gliese 569", Astrophysical Journal Letters, 330 (3): L119–L123, arXiv:1012.4421, Bibcode:2011MNRAS.413.1524F, doi:10.1111/j.1365-2966.2011.18226.x, S2CID 55001061
  12. Kenworthy, Matthew A.; Scuderi, Louis J. (June 2012), "Infrared variability of the Gliese 569B system", The Astrophysical Journal, 752 (2): 131, arXiv:1204.3454, Bibcode:2012ApJ...752..131K, doi:10.1088/0004-637X/752/2/131, S2CID 73707563
  13. Beltramo-Martin, O.; Correia, C. M.; Ragland, S.; Jolissaint, L.; Neichel, B.; Fusco, T.; Wizinowich, P. L. (August 2019), "PRIME: PSF Reconstruction and Identification for Multiple-source characterization Enhancement - application to Keck NIRC2 imager", Monthly Notices of the Royal Astronomical Society, 487 (4): 5450–5462, arXiv:1903.02772, Bibcode:2019MNRAS.487.5450B, doi:10.1093/mnras/stz1667
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