Astronomy:HD 30177

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Short description: Star in the constellation Dorado
HD 30177
Observation data
Equinox J2000.0]] (ICRS)
Constellation Dorado[1]
Right ascension  04h 41m 54.374s[2]
Declination −58° 01′ 14.73″[2]
Apparent magnitude (V) 8.41[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type G8V[4]
B−V color index 0.773±0.015[1]
Astrometry
Radial velocity (Rv)62.697±0.0013[5] km/s
Proper motion (μ) RA: 66.303±0.023[2] mas/yr
Dec.: −11.795±0.024[2] mas/yr
Parallax (π)18.0190 ± 0.0195[2] mas
Distance181.0 ± 0.2 ly
(55.50 ± 0.06 pc)
Absolute magnitude (MV)4.72±0.09[3]
Details[6]
Mass1.053±0.023 M☉
Radius1.019±0.034 R☉
Luminosity1.04±0.01[7] L☉
Surface gravity (log g)4.417±0.034 cgs
Temperature5,607±47 K
Metallicity [Fe/H]0.39±0.05 dex
Rotation~45 d
Rotational velocity (v sin i)2.96±0.50[8] km/s
Age4.8±1.5 Gyr[7]
2.525±1.954[6] Gyr
Other designations
CD−58°984, HD 30177, HIP 21850, SAO 233633, 2MASS J04415438-5801146[9]
Database references
SIMBADdata

HD 30177 is a single star with a pair of orbiting exoplanets in the southern constellation Dorado. Based on parallax measurements, it is located at a distance of 181 light years from the Sun. It has an absolute magnitude of 4.72,[3] but at that distance the star is too faint to be viewed by the naked eye with an apparent visual magnitude of 8.41.[1] The star is drifting further away with a radial velocity of 62.7 km/s.[5]

The spectrum of HD 30177 matches a late G-type main-sequence star with a stellar classification of G8V.[4] It is a yellow dwarf with a mass and radius similar to the Sun that is fusing hydrogen in its core. The chromosphere shows a negligible level of magnetic activity.[3] The abundance of iron, an indicator of the star's metallicity, is more than double the Sun's. It is radiating a similar luminosity to the Sun from its photosphere at an effective temperature of 5,607 K.[6]

A 2024 multiplicity survey, using astrometry from the Gaia spacecraft, identified a proper motion companion to HD 30177. This co-moving companion is a red dwarf star, around 10% the mass of the Sun, is located at 780" from HD 30177 with a position angle of 188°. The angular distance translates to an observed separation of 43,300 astronomical units.[10]

Planetary system

The Anglo-Australian Planet Search team announced the discovery of HD 30177 b, which has a minimum mass 8 times that of Jupiter, on June 13, 2002. The scientific paper describing the discovery was published in The Astrophysical Journal in 2003.[11][3] A second massive gas giant planet was later discovered in an approximately 32 year orbit.[12] In 2022, the inclination and estimated mass of both planets were measured via astrometry.[13]

The HD 30177 planetary system[13]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 8.403+1.241−0.489 MJ 3.604+0.135−0.147 6.884+0.014−0.012 0.207+0.012−0.017 85.393+14.354−18.742° —
c 6.150+1.308−0.341 MJ 10.258+0.535−0.480 33.088+1.596−1.207 0.039+0.005−0.013 98.016+16.025−24.235° —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Tinney, C. G. et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal 587 (1): 423–428. doi:10.1086/368068. Bibcode: 2003ApJ...587..423T. 
  4. ↑ 4.0 4.1 Houk, Nancy; Cowley, Anne P. (1975). University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars. Declinations −90° to −53°. 1. Department of Astronomy, University of Michigan. ISBN 978-0-8357-0331-4. Bibcode: 1975mcts.book.....H. 
  5. ↑ 5.0 5.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  6. ↑ 6.0 6.1 6.2 Barbato, D. et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics 615: 21. doi:10.1051/0004-6361/201832791. A175. Bibcode: 2018A&A...615A.175B. 
  7. ↑ 7.0 7.1 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. 
  8. ↑ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B. 
  9. ↑ "HD 30177". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+30177. 
  10. ↑ González-Payo, J.; Caballero, J. A.; Gorgas, J.; Cortés-Contreras, M.; Gálvez-Ortiz, M.-C.; Cifuentes, C. (2024-07-29). "Multiplicity of stars with planets in the solar neighbourhood". Astronomy & Astrophysics 689: A302. doi:10.1051/0004-6361/202450048. Bibcode: 2024A&A...689A.302G. 
  11. ↑ Tinney, Chris (2007-09-07). "AAPS Discovered Planets". University of New South Wales. http://newt.phys.unsw.edu.au/~cgt/planet/AAPS%20Planets.html. 
  12. ↑ Wittenmyer, Robert A. et al. (2017). "The Anglo-Australian Planet Search. XXV. A Candidate Massive Saturn Analog Orbiting HD 30177". The Astronomical Journal 153 (4): 167. doi:10.3847/1538-3881/aa5f17. Bibcode: 2017AJ....153..167W. 
  13. ↑ 13.0 13.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F. 

Coordinates: Sky map 04h 41m 54.3731s, −58° 01′ 14.725″



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