HD 126614

HD 126614 is a trinary star[8] system in the equatorial constellation of Virgo. The primary member, designated component A, is host to an exoplanetary companion. With an apparent visual magnitude of 8.81,[2] it is too faint to be seen with the naked eye. The system is located at a distance of 239 light years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −33 km/s.[6]

HD 126614
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 14h 26m 48.2796s[1]
Declination –05° 10′ 40.0120″[1]
Apparent magnitude (V) 8.81[2]
Characteristics
Spectral type G8IV[3] + M[4] + M5.5V[5]
Apparent magnitude (B) 9.620[2]
Apparent magnitude (J) 7.470±0.021[2]
Apparent magnitude (H) 7.160±0.042[2]
Apparent magnitude (K) 7.060±0.036[2]
B−V color index 0.810±0.004[2]
Variable type none
Astrometry
Radial velocity (Rv)−32.897±0.0042[6] km/s
Proper motion (μ) RA: −149.881±0.078[1] mas/yr
Dec.: −145.915±0.062[1] mas/yr
Parallax (π)13.6519 ± 0.0454 mas[1]
Distance238.9 ± 0.8 ly
(73.2 ± 0.2 pc)
Absolute magnitude (MV)4.52[2]
Details[4]
HD 126614 A
Mass1.145±0.03 M☉
Radius1.09±0.06 R☉
Luminosity1.21±0.19 L☉
Surface gravity (log g)4.39±0.08 cgs
Temperature5,585±44 K
Metallicity+0.56±0.04
Rotation~99 days
Rotational velocity (v sin i)2.0±0.5 km/s
Age7.2±2.0 Gyr
HD 126614 B
Mass0.324±0.004 M☉
Other designations
BD–04°3690, HD 126614, HIP 70623, SAO 139932, PPM 197558, WDS 14268-0511, G 124-40, LTT 5698, NLTT 37355[7]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

The primary is a late G-type star with a stellar classification of G8IV.[3] It is a super metal-rich star; among the most metal-rich stars currently known.[9] Because of its temperature and mass, this is most likely an evolving subgiant star rather than a main sequence star.[10] In 2010, a close stellar companion was resolved and designated component B. This object is a faint red dwarf at an angular separation of 0.5″, which corresponds to a projected physical separation of ~ 36 AU.[10]

The outer companion, component C, was first reported in 1960 with the W. J. Luyten proper motion catalog.[11] It is a magnitude 17.0 red dwarf with a class of M5.5,[5] located at an angular separation of 41.90″ from the primary along a position angle of 299°, as of 2015.[11] They have a physical projected separation of 3,040 AU.[5] The common proper motion of the system has been confirmed, indicating that they are gravitationally bound.[10]

A Doppler search for giant planets begun in 1997 at the Keck Observatory provided an 11 year baseline for detecting periodicity in the primary's radial velocity data. In 2010, a Jovian companion was announced with an orbital period of 3.41 years.[4]

The HD 126614 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.38 ± 0.04 MJ 2.35 ± 0.02 1244 ± 17 0.41 ± 0.10 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  4. Howard, Andrew W.; et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal. 721 (2): 1467–1481. arXiv:1003.3488. Bibcode:2010ApJ...721.1467H. doi:10.1088/0004-637X/721/2/1467. S2CID 14147776.
  5. Deacon, Niall R.; et al. (2014). "Wide Cool and Ultracool Companions to Nearby Stars from Pan-STARRS 1". The Astrophysical Journal. 792 (2). 119. arXiv:1407.2938. Bibcode:2014ApJ...792..119D. doi:10.1088/0004-637X/792/2/119. S2CID 38354181.
  6. Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  7. "HD 126614". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-10.
  8. Busetti, F.; et al. (November 2018). "Stability of planets in triple star systems". Astronomy & Astrophysics. 619: 12. arXiv:1811.08221. Bibcode:2018A&A...619A..91B. doi:10.1051/0004-6361/201833097. A91.
  9. Castro, Sandra; et al. (July 1997). "High-Resolution Abundance Analysis of Very Metal-rich Stars in the Solar Neighborhood". Astronomical Journal. 114: 376–387. arXiv:astro-ph/9704220. Bibcode:1997AJ....114..376C. doi:10.1086/118481.
  10. Lodieu, N.; et al. (September 2014). "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star". Astronomy & Astrophysics. 569: 14. arXiv:1408.1208. Bibcode:2014A&A...569A.120L. doi:10.1051/0004-6361/201424210. A120.
  11. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122: 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.

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