Categories
Gliese 86
From Wikipedia - Reading time: 7 min
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Gliese 86 A | |
| Right ascension | 02h 10m 25.9191s[1] |
| Declination | −50° 49′ 25.4672″[1] |
| Apparent magnitude (V) | 6.17[2] |
| Gliese 86 B | |
| Right ascension | 02h 10m 26s |
| Declination | −50° 49′ 25″ |
| Characteristics | |
| Spectral type | K1V[3] + DQ6[4][5] |
| U−B color index | 0.45 |
| B−V color index | 0.812[6] |
| V−R color index | 0.45 |
| R−I color index | 0.40 |
| Astrometry | |
| Radial velocity (Rv) | 56.7[7] km/s |
| Proper motion (μ) | RA: 2,124.853±0.075[1] mas/yr Dec.: 638.092±0.063[1] mas/yr |
| Parallax (π) | 92.7042±0.0454 mas[1] |
| Distance | 35.18 ± 0.02 ly (10.787 ± 0.005 pc) |
| Absolute magnitude (MV) | 5.95[8] |
| Orbit[4] | |
| Primary | Gliese 86 A |
| Companion | Gliese 86 B |
| Period (P) | ≈100 yr |
| Semi-major axis (a) | 23.7 au |
| Eccentricity (e) | 0.429 |
| Inclination (i) | 126.44° |
| Longitude of the node (Ω) | 234.2° |
| Details[9] | |
| Gliese 86 A | |
| Mass | 0.83±0.05 M☉ |
| Radius | 0.79±0.03 R☉ |
| Surface gravity (log g) | 4.56±0.10 cgs |
| Temperature | 5180±80 K |
| Metallicity [Fe/H] | −0.27±0.07 dex |
| Rotational velocity (v sin i) | 2.0±1.0 km/s |
| Age | 10±1 Gyr |
| Gliese 86 B | |
| Mass | 0.5425[4] M☉ |
| Temperature | 8180±120[5] K |
| Other designations | |
| Gliese 86A: CD−51°532, HD 13445, HIP 10138, HR 637, SAO 232658, WDS J02104-5049A[10] | |
| Gliese 86B: GJ 86 B, HD 13445B, WDS J02104-5049B, WD 0208-510[11] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
Gliese 86 (13 G. Eridani, HD 13445) is a K-type main-sequence star approximately 35 light-years away in the constellation of Eridanus. It has been confirmed that a white dwarf orbits the primary star. In 1998 the European Southern Observatory announced that an extrasolar planet was orbiting the star.[12]
Stellar components
[edit]The primary companion (Gliese 86 A) is a K-type main-sequence star of spectral type K1V. The characteristics in comparison to the Sun are 83% the mass, 79% the radius, and 50% the luminosity. The star has a close-orbiting massive Jovian planet.
Gliese 86 B is a white dwarf located around 21 AU from the primary star, making the Gliese 86 system one of the tightest binaries known to host an extrasolar planet.[13] It was discovered in 2001 and initially suspected to be a brown dwarf,[14] but high contrast observations in 2005 suggested that the object is probably a white dwarf, as its spectrum does not exhibit molecular absorption features which are typical of brown dwarfs.[15] Assuming the white dwarf has a mass about half that of the Sun and that the linear trend observed in radial velocity measurements is due to Gliese 86 B, a plausible orbit for this star around Gliese 86 A has a semimajor axis of 18.42 AU and an eccentricity of 0.3974.[16] When both stars were on the main sequence, the separation between the two stars was closer, at around 9 AU.[4] More precise measurements for the white dwarf give it a mass of 55% the mass of the Sun[4] and a temperature of around 8200 K.[9]
Planetary system
[edit]The planet Gliese 86 b was discovered by the Swiss 1.2 m Leonhard Euler Telescope operated by the Geneva Observatory.[17] Such an object was formed from a protoplanetary disk that was truncated at 2 AU from the parent star.[4]
The radial velocity measurements of Gliese 86 show a linear trend once the motion due to this planet are taken out. This may be associated with the orbital motion of the white dwarf companion.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.588±0.018 MJ | 0.114340±0.000001 | 15.76480±0.00004 | 0.048±0.002 | — | — |
See also
[edit]- List of exoplanets discovered before 2000 - Gliese 86b
References
[edit]- ^ a b c d e 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.
- ^ C. Cincunegui; P. J. D. Mauas (2004). "Library of flux-calibrated echelle spectra of southern late-type dwarfs with different activity levels". Astronomy and Astrophysics. 414 (2): 699–706. Bibcode:2004A&A...414..699C. doi:10.1051/0004-6361:20031671. hdl:11336/21158. Archived from the original on 2019-06-22. Retrieved 2012-06-12.
- ^ Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
- ^ a b c d e f Zeng, Yunlin; Brandt, Timothy D.; Li, Gongjie; Dupuy, Trent J.; Li, Yiting; Brandt, G. Mirek; Farihi, Jay; Horner, Jonathan; Wittenmyer, Robert A.; Butler, R. Paul.; Tinney, Christopher G.; Carter, Bradley D.; Wright, Duncan J.; Jones, Hugh R. A.; o'Toole, Simon J. (2022). "The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au". The Astronomical Journal. 164 (5): 188. arXiv:2112.06394. Bibcode:2022AJ....164..188Z. doi:10.3847/1538-3881/ac8ff7. S2CID 252872318.
- ^ a b "Open Exoplanet Catalogue, Gliese 86". Archived from the original on 2020-07-14. Retrieved 2020-07-13.
- ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Archived from the original on 2019-03-28. Retrieved 2018-02-12. Vizier catalog entry Archived 2018-10-01 at the Wayback Machine
- ^ Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78.
- ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
- ^ a b Fuhrmann, K.; et al. (2014). "On the Age of Gliese 86". The Astrophysical Journal. 785 (1). 68. Bibcode:2014ApJ...785...68F. doi:10.1088/0004-637X/785/1/68.
- ^ "HD 13445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-14.
- ^ "HD 13445B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-14.
- ^ "Extrasolar Planet in Double Star System Discovered from La Silla" (Press release). Garching, Germany: European Southern Observatory. November 24, 1998. Archived from the original on May 21, 2020. Retrieved December 29, 2012.
- ^ Raghavan, Deepak; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823.
- ^ Els, S. G.; et al. (2001). "A second substellar companion in the Gliese 86 system. A brown dwarf in an extrasolar planetary system". Astronomy and Astrophysics. 370 (1): L1 – L4. Bibcode:2001A&A...370L...1E. doi:10.1051/0004-6361:20010298. Archived from the original on 2019-06-26. Retrieved 2009-12-19.
- ^ Mugrauer, M.; Neuhäuser, R. (2005). "Gl86B: a white dwarf orbits an exoplanet host star". Monthly Notices of the Royal Astronomical Society: Letters. 361 (1): L15 – L19. arXiv:astro-ph/0506311. Bibcode:2005MNRAS.361L..15M. doi:10.1111/j.1745-3933.2005.00055.x. S2CID 16904466.
- ^ Lagrange, A.-M.; et al. (2006). "New constrains on Gliese 86 B. VLT near infrared coronographic imaging survey of planetary hosts". Astronomy and Astrophysics. 459 (3): 955–963. Bibcode:2006A&A...459..955L. doi:10.1051/0004-6361:20054710.
- ^ "Southern Sky extrasolar Planet search Programme". Archived from the original on 2020-07-15. Retrieved 2009-02-18.
- ^ Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436. S2CID 208617606.
External links
[edit]- "Gliese 86 / HR 637 AB". SolStation. Archived from the original on 2007-08-09. Retrieved 2008-08-02.
EncycloReader
is supported by the 
KSF