Astronomy:HIP 107773

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Short description: Giant star in the constellation Indus with one exoplanet
HIP 107773
Location of HIP 107773 in Indus (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Indus[1]
Right ascension  21h 50m 0.12s[2]
Declination −64° 42′ 45.1″[2]
Apparent magnitude (V) 5.6[2]
Characteristics
Evolutionary stage Horizontal branch[3][4]
Spectral type K0III[2]
B−V color index 0.99[5]
Astrometry
Radial velocity (Rv)−0.1701±0.1237[6] km/s
Proper motion (μ) RA: −0.7032±0.0807[6] mas/yr
Dec.: −37.4432±0.0893[6] mas/yr
Parallax (π)9.5919[2] mas
Distance343.9±2.6 ly
(105.5±0.8 pc)
Absolute magnitude (MV)0.54[5]
Details[4]
Mass2.42±0.27 M☉
Radius11.6±1.4 R☉
Luminosity74.13+1.12
−1.15 L☉
Surface gravity (log g)2.6±0.2 cgs
Temperature4945±100 K
Age>1[3] Gyr
Other designations
2MASS J21500013-6442451, FK5 3742, HD 207229, HR 8331, IRAS 21461-6456, PPM 365403, SAO 255080, TIC 406320735, TYC 9119-2234-1[2]
Database references
SIMBADdata

HIP 107773 is a star located 344 light years from Earth in the southern constellation Indus.[3] It is classified as a horizontal branch K-type giant star,[3][4] having a spectral type K0III[2] and a radius of 11.6 R☉.[6] With an apparent magnitude of 5.6, the star can be faintly seen with the naked eye.[2] It has an exoplanet, HIP 107773 b, a gas giant orbiting it at a distance of 0.72 astronomical units (108,000,000 km),[7] about the same distance from Venus to the Sun.[lower-alpha 1]

Characteristics

HIP 107773 is a giant star, having a spectral type K0III,[2] where K0 means it is a K-type star and III (luminosity class) means it is a giant star. The star is in the horizontal branch phase of evolution.[4][3] HIP 107773 has a radius equivalent to 11.6 solar radii, and a mass equivalent to about 2.4 solar masses.[4] It is cooler than the Sun, having an effective temperature of 4,945 K (4,672 °C).[4][lower-alpha 2] Given the mass and the evolutionary stage of the star, its age is estimated to be at least about one billion years.[3]

Planetary system

HIP 107773 has an exoplanet, HIP 107773 b, discovered in 2015 using the radial velocity method.[7][4] The planet is classified as a gas giant, having a minimum mass of 2 |♃|J}}}}}}[4] and an estimated radius of 1.19 |♃|J}}}}}}.[7] It orbits its star at a distance of 0.72 astronomical units (108,000,000 km), about the same distance as Venus is from the Sun,[lower-alpha 1] and completes one orbit every 144 days (0.39 years).[4] Its orbit is almost circular, with an eccentricity of just 0.09.[4]

With a mass of 2.4 M☉, the star HIP 107773 is one of the most massive stars with a close-in planet.[4][10]

The HIP 107773 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥1.98±0.21 MJ 0.72±0.03 144.3±0.5 0.09±0.06 — 1.19 (estimate)[7] RJ

See also

Notes

  1. ↑ 1.0 1.1 The distance from Venus to the Sun is 0.723 AU.[8]
  2. ↑ For comparison, the effective temperature of the Sun is 5,772 K (5,499 °C).[9]

Notes and 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 2.5 2.6 2.7 2.8 "HIP 107773". https://simbad.cds.unistra.fr/mobile/object.html?object_name=HIP+107773. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Ginski, C.; Mugrauer, M.; Adam, C.; Vogt, N.; Holstein, R. G. van (2021-05-01). "How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars - I. Four new close stellar companions including a white dwarf" (in en). Astronomy & Astrophysics 649: A156. doi:10.1051/0004-6361/202038964. ISSN 0004-6361. https://www.aanda.org/articles/aa/abs/2021/05/aa38964-20/aa38964-20.html. 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Olivares, F.; Melo, C. H. F. (2015-08-01). "Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP 67851c" (in en). Astronomy & Astrophysics 580: A14. doi:10.1051/0004-6361/201525853. ISSN 0004-6361. https://www.aanda.org/articles/aa/abs/2015/08/aa25853-15/aa25853-15.html. 
  5. ↑ 5.0 5.1 "HIP-107773 (Star)". https://in-the-sky.org/data/object.php?id=TYC9119-2234-1. 
  6. ↑ 6.0 6.1 6.2 "HIP 107773 Overview". https://exoplanetarchive.ipac.caltech.edu/overview/HIP%20107773. 
  7. ↑ 7.0 7.1 7.2 7.3 "HIP 107773b". https://exoplanets.nasa.gov/exoplanet-catalog/7124/hip-107773-b/. 
  8. ↑ "Venus Fact Sheet". https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html. 
  9. ↑ "Sun Fact Sheet". https://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html. 
  10. ↑ "HIP 107773 b". https://www.openexoplanetcatalogue.com/planet/HIP%20107773%20b/. 



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