HD 164509
HD 164509 is a binary star system composed of two main sequence stars in the constellation of Ophiuchus.
| 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 |
| Distance | 173.5 ± 0.5 ly (53.2 ± 0.1 pc) |
| Details[1][2][3] | |
| HD 164509A | |
| Mass | 1.13 M☉ |
| Radius | 1.06 R☉ |
| Surface gravity (log g) | 4.44 cgs |
| Temperature | 5922 K |
| Metallicity [Fe/H] | 0.21 dex |
| Rotational velocity (v sin i) | 2.4 km/s |
| Age | 1.5±0.2 Gyr |
| HD 164509B | |
| Mass | 0.33 M☉ |
| Other designations | |
BD+00 3837, HIP 88268,DENIS J084619.3-080136, 2MASS J18013121+0006163, Gaia DR2 4275421969292868224 | |
| Database references | |
| SIMBAD | 164509 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
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]
| 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
- 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.
- A. Bonfanti, S. Ortolani, G. Piotto, and V. Nascimbeni, "Revising the ages of planet-hosting stars", 2015
- Marta L. Bryan et al., "STATISTICS OF LONG PERIOD GAS GIANT PLANETS IN KNOWN PLANETARY SYSTEMS", 2016
- 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.
- 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.
- 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.
- 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.