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HD 133131

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HD 133131
Observation data
Epoch J2000      Equinox J2000
Constellation Libra[1]
A
Right ascension 15h 03m 35.44599s[2]
Declination −27° 50′ 33.2195″[2]
Apparent magnitude (V) 8.40[3]
B
Right ascension 15h 03m 35.80805s[4]
Declination −27° 50′ 27.5843″[4]
Apparent magnitude (V) 8.42[3]
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type G2V[3]
B−V color index +0.622[5]
B
Evolutionary stage main sequence[4]
Spectral type G2V[3]
B−V color index +0.622[5]
Astrometry
A
Radial velocity (Rv)−16.37±0.19[2] km/s
Proper motion (μ) RA: +156.227 mas/yr[2]
Dec.: −133.767 mas/yr[2]
Parallax (π)19.4325±0.0265 mas[2]
Distance167.8 ± 0.2 ly
(51.46 ± 0.07 pc)
B
Radial velocity (Rv)−15.70±0.18[4] km/s
Proper motion (μ) RA: +159.010 mas/yr[4]
Dec.: −139.133 mas/yr[4]
Parallax (π)19.4131 ± 0.0293 mas[4]
Distance168.0 ± 0.3 ly
(51.51 ± 0.08 pc)
Orbit[3]
Period (P)~4240 yr
Details
HD 133131A
Mass0.95[3] M☉
Radius1.00[2] R☉
Luminosity9.6[2] L☉
Surface gravity (log g)4.39±0.050[3] cgs
Temperature5,799±19[3] K
Metallicity [Fe/H]−0.306±0.016[3] dex
Rotation23 days[6]
Rotational velocity (v sin i)4.0[7] km/s
Age6.3[5] Gyr
HD 133131B
Mass0.93[3] M☉
Radius1.01[4] R☉
Luminosity0.98[4] L☉
Surface gravity (log g)4.41±0.045[3] cgs
Temperature5,805±15[3] K
Metallicity [Fe/H]−0.281±0.013[3] dex
Rotation22 days[6]
Rotational velocity (v sin i)7.0[7] km/s
Age5.9[5] Gyr
Other designations
CPD−27°5116, HD 133131, HIP 73674[8]
HD 133131A: SAO 183128, TYC 6756-1541-1, 2MASS J15033543-2750330[9]
HD 133131B: SAO 183129, TYC 6756-867-1, 2MASS J15033579-2750273[10]
Database references
SIMBADThe system
A
B
Exoplanet Archivedata

HD 133131 is a binary star in the constellation of Libra. It is 168 light-years (51.5 parsecs) away from the Sun.[3] It consists of two G-type main-sequence stars;[3] neither are bright enough to be seen with the naked eye. The star was first catalogued as a binary in 1972.[11][3]

Both components, HD 133131 A and B, are very similar to the Sun but are far older, about 6 billion years old. They also have low metallicities (50% of solar abundance), and HD 133131A is additionally depleted in heavy elements compared to HD 133131B, indicating a possibly past planetary engulfment event for HD 133131 B.[6]

Planetary system

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In 2016, two planets orbiting HD 133131A and one planet orbiting HD 133131B were discovered utilizing the radial velocity method. All three are long-period giant planets.[3]

The HD 133131A planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥1.43 MJ 1.44 649 0.32 — —
c ≥0.63 MJ 4.79 3925 0.20 — —
The HD 133131B planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥2.50 MJ 6.40 6119 0.62 — —

See also

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Other systems with multiple planet-hosting stars:

References

[edit]
  1. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ a b c d e f g h 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.
  3. ^ a b c d e f g h i j k l m n o p q r s Teske, Johanna K; Shectman, Stephen A; Vogt, Steve S; Díaz, Matías; Butler, R. Paul; Crane, Jeffrey D; Thompson, Ian B; Arriagada, Pamela (2016). "The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B". The Astronomical Journal. 152 (6): 167. arXiv:1608.06216. Bibcode:2016AJ....152..167T. doi:10.3847/0004-6256/152/6/167. S2CID 118852162.
  4. ^ a b c d e f g h 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.
  5. ^ a b c d Arriagada, Pamela (2011). "Chromospheric Activity of Southern Stars from the Magellan Planet Search Program". The Astrophysical Journal. 734 (1): 70. arXiv:1104.3186. Bibcode:2011ApJ...734...70A. doi:10.1088/0004-637X/734/1/70. S2CID 118384591.
  6. ^ a b c Oh, Semyeong; Price-Whelan, Adrian M.; Brewer, John M.; Hogg, David W.; Spergel, David N.; Myles, Justin (2017). "Kronos and Krios: Evidence for Accretion of a Massive, Rocky Planetary System in a Comoving Pair of Solar-type Stars". The Astrophysical Journal. 854 (2): 138. arXiv:1709.05344. doi:10.3847/1538-4357/aaab4d. S2CID 119076217.
  7. ^ a b Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.
  8. ^ "HD 133131". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  9. ^ "HD 133131A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  10. ^ "HD 133131B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  11. ^ Stock, J.; Wroblewski, H. (May 1972). "Double stars of equal components". Astronomy and Astrophysics. 18: 341. Bibcode:1972A&A....18..341S.
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