Star in the constellation Ophiuchus
HD 171028 is a star with an exoplanet companion in the equatorial constellation of Ophiuchus . With an apparent visual magnitude of 8.3,[ 2] it is too faint to be readily visible with the naked eye. Unlike most planet-harboring stars, it does not have a Hipparcos number . The star is located at a distance of approximately 365 light years from the Sun based on parallax , and is drifting further away with a radial velocity of +13.5 km/s.[ 1]
This is a yellow-hued G-type star of unknown luminosity class with a stellar classification of G0.[ 3] It is a metal-poor star belonging to the thin disk population.[ 6] HD 171028 is estimated to be nearly five billion years old and is spinning with a projected rotational velocity of 2.3 km/s.[ 3] It has the same mass as the Sun, but the radius is 2.4 times larger. The star is radiating 5.4[ 1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,671 K.[ 2]
In the summer of 2007, a Jovian planetary companion was discovered by the HARPS planet search program using the radial velocity method .[ 3] This object is orbiting at a distance of 1.32 AU from the host star with a period of 1.5 years and an eccentricity (ovalness) of 0.59. Since the inclination of the orbit is unknown, only a minimum mass can be determined. This planet has at least double the mass of Jupiter .[ 7]
See also
References
^ a b c d e f g h i j Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics . 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR .
^ a b c d e f g Sousa, S. G.; et al. (February 2011). "Spectroscopic characterization of a sample of metal-poor solar-type stars from the HARPS planet search program. Precise spectroscopic parameters and mass estimation". Astronomy and Astrophysics . 526 : 11. arXiv :1012.1528 . Bibcode :2011A&A...526A..99S . doi :10.1051/0004-6361/201015646 . S2CID 118785170 . A99.
^ a b c d e f Santos, N. C.; et al. (2007). "The HARPS search for southern extra-solar planets. XII. A giant planet orbiting the metal-poor star HD 171028" . Astronomy and Astrophysics . 474 (2): 647–651. arXiv :0708.0954 . Bibcode :2007A&A...474..647S . doi :10.1051/0004-6361:20078129 . S2CID 73681862 .
^ Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics . 634 : 10. arXiv :1912.08659 . Bibcode :2020A&A...634A.136C . doi :10.1051/0004-6361/201936523 . S2CID 209405391 . A136.
^ "HD 171028" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-10-06 .
^ Haywood, M. (May 2008). "A peculiarity of metal-poor stars with planets?". Astronomy and Astrophysics . 482 (2): 673–676. arXiv :0804.2954 . Bibcode :2008A&A...482..673H . doi :10.1051/0004-6361:20079141 . S2CID 16390388 .
^ a b Santos, Nuno C.; et al. (2011), "The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample" , Astronomy and Astrophysics , 526 : A112, arXiv :1011.2094 , Bibcode :2011A&A...526A.112S , doi :10.1051/0004-6361/201015494 , S2CID 119106340