Gliese 86

Binary star system in the constellation Eridanus

Gliese 86  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.

The Gliese 86 planetary system[18] 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]

1. ^ 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.
2. ^ 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.
3. ^ 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.
4. ^ 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.
5. ^ a b "Open Exoplanet Catalogue, Gliese 86". Archived from the original on 2020-07-14. Retrieved 2020-07-13.
6. ^ 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
7. ^ 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.
8. ^ 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.
9. ^ 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.
10. ^ "HD 13445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-14.
11. ^ "HD 13445B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-14.
12. ^ "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.
13. ^ 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.
14. ^ 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.
15. ^ 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.
16. ^ 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.
17. ^ "Southern Sky extrasolar Planet search Programme". Archived from the original on 2020-07-15. Retrieved 2009-02-18.
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.

* v
* t
* e

Constellation of Eridanus

* List of stars in Eridanus
* Eridanus in Chinese astronomy

Stars|

| Bayer|

* α (Achernar)
* β (Cursa)
* γ (Zaurak)
* δ (Rana)
* ε (Ran)
* ζ (Zibal)
* η (Azha)
* θ1 (Acamar)
* θ2
* ι
* κ
* λ
* μ
* ν
* ξ
* ο1 (Beid)
* ο2 (40, Keid)
* π
* ρ1
* ρ2
* ρ3
* τ1
* τ2 (Angetenar)
* τ3
* τ4
* τ5
* τ6
* τ7
* τ8
* τ9
* υ1
* υ2 (Theemin)
* υ3 (Beemim)
* υ4
* φ
* χ
* ψ
* ω
* e (82 G.)
* p

|

Flamsteed|

* 14
* 15
* 17 (v)
* 39 (A)
* 45
* 51 (c)
* 53 (Sceptrum)
* 54
* 58
* 64
* 66

Variable|

* DO
* DZ
* EF
* EK
* EM (d)
* EP
* KT

HR|

* 506 (q1)
* 789 (s)
* 859
* 1106 (y)
* 1143 (h)
* 1189 (f)
* 1190 (f)
* 1195 (g)
* 1483
* 1536
* 1614

HD|

* 18742 (Ayeyarwady)
* 19467
* 20722
* 28185
* 30562
* 30856 (Mouhoun)
* 30963

Other|

* 2MASS J04151954−0935066
* DENIS 0255−4700
* Gliese 86
* Gliese 180
* GJ 1062
* GJ 3293
* GJ 3323
* HIP 12961 (Koeia)
* LTT 1445
* LP 890-9
* Mothra
* WASP-22 (Tojil)
* WASP-35
* WASP-50 (Chaophraya)
* WASP-78
* WASP-79 (Montuno)
* WISE J0336−0143

| Exoplanets|

* 51 Eridani b
* ε Eridani b (AEgir)
* Gliese 86 b
* HD 10647 b
* HD 18742 b (Bagan)
* HD 28185 b
* HD 30562 b
* HD 30856 Ab (Nakanbé)
* WASP-79b (Pollera)

|

Nebulae|

| NGC|

* 1535

|

Galaxies|

| NGC|

* 685
* 782
* 852
* 939
* 1084
* 1132
* 1140
* 1154
* 1155
* 1157
* 1158
* 1164
* 1172
* 1187
* 1189
* 1190
* 1191
* 1192
* 1199
* 1222
* 1232
* 1234
* 1241
* 1253
* 1262
* 1266
* 1269
* 1291
* 1300
* 1309
* 1325
* 1332
* 1337
* 1345
* 1347
* 1353
* 1357
* 1369
* 1386
* 1395
* 1400
* 1403
* 1404
* 1407
* 1421
* 1426
* 1427A
* 1436
* 1437
* 1439
* 1452
* 1460
* 1487
* 1531
* 1532
* 1592
* 1600
* 1614
* 1637
* 1667
* 1700
* 1721
* 1723
* 1725
* 1728
* 1741

|

Other|

* Eridanus II
* ESO 198-13
* ESO 0313-192
* IC 1953
* IC 2006
* LEDA 74886
* MRC 0406-244
* NRAO 190
* PKS 0208-512
* PKS 0405–385
* PKS 0420-014
* UGC 2812

| Galaxy clusters|

* Abell 383
* Eridanus Cluster
* Eridanus Group
* MACS J0416.1-2403

|

| Astronomical events|

* GRB 080913
* HE0435-1223
* SN 1999em

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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