HD 164509

HD 164509 is a binary star system composed of two main sequence stars in the constellation of Ophiuchus.

HD 164509
Observation data
Epoch J2000      Equinox
Constellation Ophiuchus
Right ascension 18h 01m 31.2276s
Declination 00° 06 16.4026
Apparent magnitude (V) 8.103
Characteristics
Evolutionary stage main sequence star
Spectral type G2V
B−V color index 0.72
J−H color index 0.273
J−K color index 0.352
Astrometry
Radial velocity (Rv)13.68±0.16 km/s
Proper motion (μ) RA: -7.864±0.087 mas/yr
Dec.: -20.380±0.086 mas/yr
Parallax (π)18.7994 ± 0.0503 mas
Distance173.5 ± 0.5 ly
(53.2 ± 0.1 pc)
Details[1][2][3]
HD 164509A
Mass1.13 M
Radius1.06 R
Surface gravity (log g)4.44 cgs
Temperature5922 K
Metallicity [Fe/H]0.21 dex
Rotational velocity (v sin i)2.4 km/s
Age1.5±0.2 Gyr
HD 164509B
Mass0.33 M
Other designations
BD+00 3837, HIP 88268,DENIS J084619.3-080136, 2MASS J18013121+0006163, Gaia DR2 4275421969292868224
Database references
SIMBAD164509 data

Star characteristics

HD 164509 primary star is a yellow main sequence star of spectral class G2, similar to the Sun. It is young and metal rich, having heavy elements abundance 160% of solar. Initially it was thought the system to comprise a single G5 class star, but in 2016 it was discovered the G2 primary is accompanied by the M-class red dwarf star at projected separation of 36.5±1.9 AU.[4] The evidence for the stellar companion being on bound orbit was further fortified in 2017.[5]

Planetary system

The planet

In 2011, a Hot Jupiter class planet HD 164509 b was discovered around primary of HD 164509 using the radial velocity method.[1] The planet HD 164509 b is impossible to form on the currently unstable in long term[6] orbit, and may be a captured object formed elsewhere.[7]

The HD 164509 planetary system[1]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.48±0.09 MJ 0.875±0.008 282.4±3.8 0.26±0.14

References

  1. Giguere, Matthew J.; Fischer, Debra A.; Howard, Andrew W.; Johnson, John A.; Henry, Gregory W.; Wright, Jason T.; Marcy, Geoffrey W.; Isaacson, Howard T.; Hou, Fengji; Spronck, Julien (2012). "A High-Eccentricity Component in the Double-Planet System Around Hd 163607 and a Planet Around Hd 164509". The Astrophysical Journal. 744 (1): 4. arXiv:1109.2955. Bibcode:2012ApJ...744....4G. doi:10.1088/0004-637X/744/1/4. S2CID 119207947.
  2. A. Bonfanti, S. Ortolani, G. Piotto, and V. Nascimbeni, "Revising the ages of planet-hosting stars", 2015
  3. Marta L. Bryan et al., "STATISTICS OF LONG PERIOD GAS GIANT PLANETS IN KNOWN PLANETARY SYSTEMS", 2016
  4. Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Hirsch, Lea; Howell, Steve B.; Ciardi, David R.; Everett, Mark E.; Teske, Johanna K. (2016). "Stellar Companions to the Exoplanet Host Stars Hd 2638 and Hd 164509". The Astronomical Journal. 152 (5): 149. arXiv:1609.00016. Bibcode:2016AJ....152..149W. doi:10.3847/0004-6256/152/5/149. S2CID 45942803.
  5. Ngo, Henry; Knutson, Heather A.; Bryan, Marta L.; Blunt, Sarah; Nielsen, Eric L.; Batygin, Konstantin; Bowler, Brendan P.; Crepp, Justin R.; Hinkley, Sasha; Howard, Andrew W.; Mawet, Dimitri (2017). "No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems". The Astronomical Journal. 153 (6): 242. arXiv:1704.02326. Bibcode:2017AJ....153..242N. doi:10.3847/1538-3881/aa6cac. S2CID 119106164.
  6. Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020). "Orbital Stability of Circumstellar Planets in Binary Systems". The Astronomical Journal. 159 (3): 80. arXiv:1912.11019. Bibcode:2020AJ....159...80Q. doi:10.3847/1538-3881/ab64fa. S2CID 209444271.
  7. Fragione, Giacomo (2018). "Dynamical origin of S-type planets in close binary stars". Monthly Notices of the Royal Astronomical Society. arXiv:1812.02754. doi:10.1093/mnras/sty3367. S2CID 119457949.
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