Gliese 86

Short description: Binary star system in the constellation Eridanus

Gliese 86  Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000.0 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}

Constellation | Eridanus[1]
Gliese 86 A
Right ascension |  02h 10m 25.9191s[2]
Declination | −50° 49′ 25.467″[2]
Apparent magnitude (V) | 6.17[3]
Gliese 86 B
Right ascension |  02h 10m 26s[citation needed]
Declination | −50° 49′ 2″[citation needed]
Apparent magnitude (V) | 14.0[4]
Characteristics
Spectral type | K1V[5] \+ DQ6[6][7]
U−B color index | 0.45
B−V color index | 0.812[8]
V−R color index | 0.45
R−I color index | 0.40
Astrometry

Radial velocity (Rv)| 56.7[9] km/s
Proper motion (μ)|  RA: 2,124.853±0.075[2] mas/yr
Dec.: 638.092±0.063[2] mas/yr
Parallax (π)| 92.7042 ± 0.0454[2] mas
Distance| 35.18 ± 0.02 ly
(10.787 ± 0.005 pc)
Absolute magnitude (MV)| 5.95[10]
Orbit[6]
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
Gliese 86 A
Mass| 0.83±0.05[11] M☉
Radius| 0.79±0.03[11] R☉
Luminosity| 0.41[12] L☉
Surface gravity (log g)| 4.56±0.10[11] cgs
Temperature| 5,180±80[11] K
Metallicity [Fe/H]| −0.27±0.07[11] dex
Rotation| 30.0 days[13]
Rotational velocity (v sin i)| 2.0±1.0[11] km/s
Age| 10±1[11] Gyr
Gliese 86 B
Mass| 0.5425[6] M☉
Surface gravity (log g)| 8.00[14] cgs
Temperature| 8,180±120[7] K
Other designations

GJ 86, WDS J02104-5049

Gliese 86A: CD−51°532, HD 13445, HIP 10138, HR 637, SAO 232658[15]
Gliese 86B: WD 0208-510[16]
Database references
SIMBAD| data
| B
Exoplanet Archive| 13445 data
ARICNS| data
Extrasolar Planets
Encyclopaedia| data

Gliese 86 (13 G. Eridani, HD 13445) is a K-type main-sequence star 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 also orbiting the star.[17]

## Contents

* 1 Stellar components
* 2 Planetary system
* 3 See also
* 4 References
* 5 External links

## Stellar components

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.[18] It was discovered in 2001 and initially suspected to be a brown dwarf,[19] 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.[20] 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.[21] When both stars were on the main sequence, the separation between the two stars was closer, at around 9 AU.[6] More precise measurements for the white dwarf give it a mass of 55% the mass of the Sun[6] and a temperature of around 8200 K.[11]

## Planetary system

The planet Gliese 86 b was discovered by the Swiss 1.2 m Leonhard Euler Telescope operated by the Geneva Observatory.[22] Such an object was formed from a protoplanetary disk that was truncated at 2 AU from the parent star.[6]

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 A planetary system[23] 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

* List of exoplanets discovered before 2000 \- Gliese 86b

## References

1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
3. ↑ 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. doi:10.1051/0004-6361:20031671. Bibcode: 2004A&A...414..699C.
4. ↑ Holberg, J. B.; Oswalt, T. D.; Sion, E. M.; McCook, G. P. (2016). "The 25 parsec local white dwarf population". Monthly Notices of the Royal Astronomical Society 462 (3): 2295. doi:10.1093/mnras/stw1357. Bibcode: 2016MNRAS.462.2295H.
5. ↑ 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Zeng, Yunlin; Brandt, Timothy D.; Li, Gongjie; Dupuy, Trent J.; Li, Yiting; Brandt, G. Mirek; Farihi, Jay; Horner, Jonathan et al. (2022). "The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au". The Astronomical Journal 164 (5): 188. doi:10.3847/1538-3881/ac8ff7. Bibcode: 2022AJ....164..188Z.
7. ↑ 7.0 7.1 "Open Exoplanet Catalogue, Gliese 86". http://www.openexoplanetcatalogue.com/planet/Gliese 86 b/.
8. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
9. ↑ 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, doi:10.1088/0004-637X/764/1/78, Bibcode: 2013ApJ...764...78R.
10. ↑ 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, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H.
11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 11.7 Fuhrmann, K. et al. (2014). "On the Age of Gliese 86". The Astrophysical Journal 785 (1): 68. doi:10.1088/0004-637X/785/1/68. Bibcode: 2014ApJ...785...68F.
12. ↑ Reiners, Ansgar; Zechmeister, Mathias (2020). "Radial Velocity Photon Limits for the Dwarf Stars of Spectral Classes F-M". The Astrophysical Journal Supplement Series 247 (1): 11. doi:10.3847/1538-4365/ab609f. Bibcode: 2020ApJS..247...11R.
13. ↑ Cruz Aguirre, Fernando; Youngblood, Allison; France, Kevin; Bourrier, Vincent (2023). "Disentangling Stellar and Airglow Emission Lines from Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) Spectra". The Astrophysical Journal 946 (2): 98. doi:10.3847/1538-4357/acad7d. Bibcode: 2023ApJ...946...98C.
14. ↑ Sion, Edward M.; Holberg, J. B.; Oswalt, Terry D.; McCook, George P.; Wasatonic, Richard (2009). "The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal 138 (6): 1681. doi:10.1088/0004-6256/138/6/1681. Bibcode: 2009AJ....138.1681S.
15. ↑ "HD 13445". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+13445.
16. ↑ "HD 13445B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+13445B.
17. ↑ "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.
18. ↑ Raghavan, Deepak et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal 646 (1): 523–542. doi:10.1086/504823. Bibcode: 2006ApJ...646..523R.
19. ↑ Els, S. G. (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. doi:10.1051/0004-6361:20010298. Bibcode: 2001A&A...370L...1E.
20. ↑ 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. doi:10.1111/j.1745-3933.2005.00055.x. Bibcode: 2005MNRAS.361L..15M.
21. ↑ Lagrange, A.-M. (2006). "New constrains on Gliese 86 B. VLT near infrared coronographic imaging survey of planetary hosts". Astronomy and Astrophysics 459 (3): 955–963. doi:10.1051/0004-6361:20054710. Bibcode: 2006A&A...459..955L.
22. ↑ "Southern Sky extrasolar Planet search Programme". http://obswww.unige.ch/~udry/planet/coralie.html.
23. ↑ 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. doi:10.1093/mnras/stz3436. Bibcode: 2020MNRAS.492..377W.

## External links

* "Gliese 86 / HR 637 AB". SolStation. http://www.solstation.com/stars2/gl86.htm.

Coordinates:  02h 10m 14s, −50° 50′ 00″

* v
* t
* e

Eridanus constellation

Stars (list)|

| Bayer|

* α (Achernar)
* β (Cursa)
* γ (Zaurak)
* δ
* ε (Ran)
* ζ (Zibal)
* η (Azha)
* θ1 (Acamar)
* θ2
* ι
* κ
* λ
* μ
* ν
* ξ
* ο1 (Beid)
* ο2 (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

|

Flamsteed|

* 4
* 5
* 6 (p)
* 7
* 14
* 15
* 17 (v)
* 20
* 21
* 22
* 24
* 25
* 29
* 30
* 32 (w)
* 35
* 37
* 39 (A)
* 45
* 46
* 47
* 51 (c)
* 53 (Sceptrum)
* 54
* 55
* 56
* 58
* 59
* 60
* 62 (b)
* 63
* 64
* 66
* 68

Variable|

* R
* RT
* RX
* RZ
* SV
* TZ
* UX
* UY
* XZ
* YY
* AH
* AQ
* AS
* BV
* BW
* CC
* CP
* CW
* DL
* DO
* DU
* DZ
* EF
* EI
* EK
* EL
* EM
* EP
* EX
* GU
* GW
* GY
* GZ
* KT

HR|

* 506 (q1)
* 520 (q2)
* 573
* 701
* 789 (s)
* 807
* 814
* 826
* 827
* 853
* 859
* 862
* 875
* 892
* 895
* 912
* 913
* 929
* 935
* 953
* 955
* 957
* 968
* 983
* 997
* 1016
* 1024
* 1049
* 1050
* 1060
* 1062
* 1075
* 1076
* 1091
* 1098
* 1106 (y)
* 1108
* 1116
* 1117
* 1120
* 1125
* 1139
* 1143 (h)
* 1157
* 1182
* 1186
* 1187
* 1189 (f)
* 1190 (f)
* 1195 (g)
* 1206
* 1214 (i)
* 1219
* 1232
* 1235
* 1246
* 1249
* 1258
* 1263
* 1265
* 1267
* 1272
* 1274
* 1275
* 1293
* 1299
* 1332
* 1353
* 1359
* 1366
* 1367
* 1374
* 1384
* 1386
* 1410
* 1421
* 1431
* 1438
* 1439
* 1447
* 1450
* 1452
* 1461
* 1462
* 1476
* 1483
* 1487
* 1488
* 1495
* 1513
* 1521
* 1536
* 1545
* 1579
* 1595
* 1614
* 1625
* 1671

HD|

* 11965
* 12894
* 13808
* 18742
* 19210
* 19850
* 20356
* 22379
* 24098
* 24834
* 26584
* 26625
* 27660
* 28185
* 29163
* 30562
* 30856
* 30963

Gliese|

* Gliese 86
* GJ 180
* GJ 1062
* Gliese 3293

Other|

* 82 G. (e)
* DEN 0255−4700
* GD 50
* HIP 12961
* L 369-44
* LHS 1723
* LP 771-095
* 2MASS J04151954−0935066
* 2MASS J04390101−2353083
* WASP-22
* WASP-50
* WASP-78
* WASP-79

Former|

* WX (V1241 Tauri)

Galaxies|

| NGC|

* 685
* 745
* 754
* 782
* 795
* 852
* 939
* 954
* 979
* 1081
* 1082
* 1083
* 1084
* 1089
* 1091
* 1092
* 1098
* 1099
* 1100
* 1102
* 1103
* 1108
* 1110
* 1114
* 1118
* 1119
* 1120
* 1121
* 1125
* 1126
* 1132
* 1133
* 1139
* 1140
* 1145
* 1148
* 1150
* 1151
* 1152
* 1154
* 1155
* 1157
* 1158
* 1162
* 1163
* 1172
* 1179
* 1180
* 1181
* 1182
* 1185
* 1187
* 1188
* 1189
* 1190
* 1191
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* 1195
* 1196
* 1199
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* 1221
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* 1225
* 1228
* 1229
* 1230
* 1231
* 1232
* 1234
* 1238
* 1239
* 1241
* 1242
* 1247
* 1248
* 1253
* 1256
* 1258
* 1262
* 1263
* 1266
* 1269
* 1284
* 1285
* 1286
* 1287
* 1289
* 1290
* 1291
* 1295
* 1296
* 1297
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* 1299
* 1300
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* 1308
* 1309
* 1314
* 1315
* 1319
* 1320
* 1321
* 1322
* 1323
* 1324
* 1325
* 1328
* 1329
* 1331
* 1332
* 1337
* 1338
* 1345
* 1346
* 1347
* 1352
* 1353
* 1354
* 1355
* 1357
* 1358
* 1359
* 1361
* 1362
* 1363
* 1364
* 1368
* 1369
* 1370
* 1372
* 1376
* 1377
* 1383
* 1386
* 1388
* 1389
* 1390
* 1391
* 1393
* 1394
* 1395
* 1397
* 1400
* 1401
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* 1405
* 1407
* 1413
* 1414
* 1415
* 1416
* 1417
* 1418
* 1419
* 1421
* 1422
* 1423
* 1424
* 1426
* 1427A
* 1434
* 1436
* 1437
* 1438
* 1439
* 1440
* 1441
* 1442
* 1445
* 1447
* 1449
* 1450
* 1451
* 1452
* 1453
* 1455
* 1458
* 1460
* 1461
* 1464
* 1467
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* 1470
* 1471
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* 1475
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* 1481
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* 1489
* 1492
* 1504
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* 1516
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* 1519
* 1521
* 1524
* 1525
* 1531
* 1532
* 1537
* 1538
* 1540
* 1540
* 1547
* 1552
* 1561
* 1562
* 1563
* 1564
* 1565
* 1568
* 1575
* 1576
* 1577
* 1580
* 1583
* 1584
* 1586
* 1591
* 1592
* 1594
* 1597
* 1599
* 1600
* 1601
* 1603
* 1604
* 1606
* 1607
* 1609
* 1611
* 1612
* 1613
* 1614
* 1618
* 1620
* 1621
* 1622
* 1623
* 1625
* 1626
* 1627
* 1628
* 1630
* 1631
* 1632
* 1635
* 1636
* 1637
* 1638
* 1640
* 1643
* 1645
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* 1650
* 1653
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* 1657
* 1659
* 1665
* 1666
* 1667
* 1677
* 1681
* 1686
* 1689
* 1692
* 1694
* 1699
* 1700
* 1720
* 1721
* 1723
* 1725
* 1726
* 1728
* 1741
* 1752
* 1779
* 1797
* 1799

|

Other|

* Eridanus II
* ESO 198-13
* IC 2006
* LEDA 74886

Galaxy clusters|

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

Other|

* GRB 080913

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