HD 189567
HD 189567 is a star with a pair of orbiting exoplanets, located in the southern constellation of Pavo. It is also known as Gliese 776, CD-67 2385, and HR 7644. The star has an apparent visual magnitude of 6.07,[3] which is bright enough for it to be dimly visible to the naked eye. It lies at a distance of 58 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −10.5 km/s.[6]
The spectrum of HD 189567 presents as an ordinary G-type main-sequence star with a stellar classification of G3V.[3] It has 83%[3] of the mass of the Sun but 110% of the Sun's radius.[2] The star is moderately depleted in heavy elements, having 55% of the solar abundance of iron,[10] but is less depleted in oxygen, having 80% of its solar abundance.[11] It has a low level of magnetic activity in its chromosphere.[3] Age estimates range from 4.11 Gyr based on chromospheric heating to 11.26 Gyr from stellar rotation.[9] The star is radiating 2.1 times the luminosity of the Sun from its photosphere at an effective temperature of 5,726 K.[3]
Planetary system
[edit]One exoplanet was discovered around the star in 2011, HD 189567 b.[12] This exoplanet has an estimated minimum mass of 8.5 Earth masses, which means that it is most likely a mini-Neptune.[13] It has an orbital period of 14.3 days, placing it well interior to the habitable zone of the star system.[14] The planet's existence was confirmed in 2021, along with the discovery of a second planet, HD 189567 c.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥8.5±0.6 M🜨 | 0.111±0.002 | 14.288±0.002 | <0.189 | — | — |
| c | ≥7.0±0.9 M🜨 | 0.197±0.003 | 33.688±0.025 | 0.16±0.09 | — | — |
References
[edit]- ^ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 2 January 2021.
- ^ a b c d e f 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.
- ^ a b c d e f g h i j k l m n o p q r s Unger, N.; Ségransan, D.; et al. (2021). "The HARPS search for southern extra-solar planets. XLVI. 12 super-Earths around the solar type stars HD 39194, HD 93385, HD 96700, HD 154088, and HD 189567". Astronomy & Astrophysics. 654: A104. arXiv:2108.10198. Bibcode:2021A&A...654A.104U. doi:10.1051/0004-6361/202141351.
- ^ a b "HD 189567", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2 January 2021
- ^ a b c 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.
- ^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- ^ Llorente de Andrés, F.; et al. (October 2021). "The evolution of lithium in FGK dwarf stars". Astronomy & Astrophysics. 654: A137. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339. eISSN 1432-0746. ISSN 0004-6361.
- ^ Pace, G. (March 2013). "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram". Astronomy & Astrophysics. 551: 4. arXiv:1301.5651. Bibcode:2013A&A...551L...8P. doi:10.1051/0004-6361/201220364. S2CID 56420519. L8.
- ^ a b Vican, Laura (June 2012). "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey". The Astronomical Journal. 143 (6): 135. arXiv:1203.1966. Bibcode:2012AJ....143..135V. doi:10.1088/0004-6256/143/6/135. S2CID 118539505.
- ^ Giribaldi, R. E.; et al. (2019). "Faint solar analogues at the limit of no reddening". Astronomy & Astrophysics. 629: A33. arXiv:1907.00445. doi:10.1051/0004-6361/201935901. S2CID 195766778.
- ^ Nissen, P. E.; et al. (2020). "High-precision abundances of elements in solar-type stars". Astronomy & Astrophysics. 640: A81. arXiv:2006.06013. Bibcode:2020A&A...640A..81N. doi:10.1051/0004-6361/202038300. S2CID 219573423.
- ^ Mayor, M.; et al. (12 September 2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph].
- ^ "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". phl.upr.edu. Retrieved 2020-12-16.
- ^ "HD 189567 b". Extrasolar Planets Encyclopaedia. Retrieved 2020-12-16.
