HD 139357
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Draco
Right ascension 15h 35m 16.198593s[1]
Declination +53° 55′ 19.709392″[1]
Apparent magnitude (V) 5.97[2]
Characteristics
Spectral type K4III[3]
B−V color index 1.184±0.006[2]
Astrometry
Radial velocity (Rv)−8.53±0.13[1] km/s
Proper motion (μ) RA: −18.845±0.051 mas/yr[1]
Dec.: 2.097±0.063 mas/yr[1]
Parallax (π)8.8114 ± 0.0460 mas[1]
Distance370 ± 2 ly
(113.5 ± 0.6 pc)
Absolute magnitude (MV)0.61[2]
Details
Mass1.1±0.1 M☉[4]
1.35±0.24 M☉[5]
2.16±0.18[3] M☉
Radius11.47±0.75 R☉[5]
14.4±0.4[3] R☉
Luminosity74±1[4] L☉
Surface gravity (log g)2.2±0.1 cgs[4]
2.63±0.10 cgs[6]
2.9±0.15[5] cgs
Temperature4,601±28[6] K
Metallicity [Fe/H]−0.13±0.05 dex[5]
0.34±0.05[3] dex
Age1.19±0.33 Gyr[6]
3.07±1.47 Gyr[3]
7.20±1.80[4] Gyr
Other designations
BD+54°1756, GC 20977, HD 139357, HIP 76311, HR 5811, SAO 29583, PPM 35043, GCRV 9003[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 139357 is a 6th magnitude K-type giant star located approximately 370 light years from Earth, visible in the constellation Draco. Its mass is four thirds that of the Sun but its radius is 11.47 times larger. However, despite being a giant star, it is only 3.07 billion years old, which is younger than the Sun.

It hosts a substellar companion with a minimum mass of 9.76 MJ, discovered in 2009.[5] A 2022 study estimated the true mass of HD 139357 b at about 16.38 MJ via astrometry, although this estimate is poorly constrained. If this is the true mass, the object would be a brown dwarf.[8]

The HD 139357 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥9.76 ± 2.15 MJ 2.36 ± 0.02 1125.7 ± 9 0.10 ± 0.02 — —

See also

References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. 1 2 3 4 5 Maldonado, J.; et al. (April 2019). "Connecting substellar and stellar formation: the role of the host star's metallicity". Astronomy & Astrophysics. 624: 7. arXiv:1903.01141. Bibcode:2019A&A...624A..94M. doi:10.1051/0004-6361/201833827. S2CID 118934484. A94.
  4. 1 2 3 4 Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
  5. 1 2 3 4 5 6 Döllinger, M. P.; et al. (2009). "Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357". Astronomy and Astrophysics. 499 (3): 935–942. arXiv:0903.3593. Bibcode:2009A&A...499..935D. doi:10.1051/0004-6361/200810837. S2CID 15677079.
  6. 1 2 3 Maldonado, J.; Villaver, E. (April 2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy & Astrophysics. 588: 11. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. S2CID 119212009. A98.
  7. ↑ "HD 139357". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.
  8. ↑ Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.


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