HD 13189

HD 13189 is an 8th magnitude star in Triangulum constellation.

HD 13189

HD 13189 as seen in Celestia.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension  02h 09m 40.1721s[1]
Declination +32° 18′ 59.1607″[1]
Apparent magnitude (V) +7.57[2]
Characteristics
Spectral type K1II-III[3]
Astrometry
Radial velocity (Rv)25.39[4] km/s
Proper motion (μ) RA: 2.465±0.085[1] mas/yr
Dec.: 4.934±0.089[1] mas/yr
Parallax (π)1.9813 ± 0.0621[1] mas
Distance1,650 ± 50 ly
(500 ± 20 pc)
Absolute magnitude (MV)–3.8[5]
Details
Mass2–7[2] M☉
Radius45.5[6] to 50.4[7] R☉
Luminosity3,980[5] L☉
Surface gravity (log g)1.74[7] cgs
Temperature4,365[6] K
Metallicity [Fe/H]-0.58 ± 0.04[8] dex
Other designations
BD+31° 370, HIP 10085, SAO 55309.[9]
Database references
SIMBADdata

In 2005, a planetary companion or brown dwarf was announced in orbit around this star. At the time, the parallax estimate was 0.54 ± 0.93 mas, which would suggest a distance of 6,040 ly (1,850 pc) with a high margin of error.[2] In 2007, van Leeuwen published a revised parallax measurement of 1.78 ± 0.73, which corresponds to a distance of 1,830 ly (560 pc) with a smaller but still significant margin of error.[10] In 2018 the Gaia spacecraft measured a parallax of 1.9813±0.0621 which is a distance of 1,650 ly (510 pc) with an error of only 50 ly (15 pc).[1]

It has a spectral classification of K1II-III, making it a giant star that has evolved away from the main sequence. The mass is 2–7 times the Sun,[2] while measurements of the star's radius give estimates of 45.5[6] or 50.4[7] solar radii. The atmosphere of the star displays short period radial velocity variations with a primary period of 4.89 days. This behavior is typical for giant K-type stars such as this and it is not the result of a close-orbit planetary companion.[5]

The star is possibly the most massive of all planet-harboring stars.[11]

HD 13189 b
HD 13189 b
Discovery
Discovered byHatzes et al.
Discovery siteTautenburg, Germany
Discovery date2005
Radial Velocity
Orbital characteristics
1.85 ± 0.35 AU (277,000,000 ± 52,000,000 km)
Eccentricity0.28 ± 0.06
471.6 ± 6 d
2452327.9 ± 20.2
160.7 ± 12
Semi-amplitude6.8 ± 1.5
Physical characteristics
Mass>14 ± 6 MJ

    HD 13189 b is an exoplanet or brown dwarf with mass ranges from 8 to 20 Jupiter mass. This object is located at a mean distance of 277 Gm (1.85 AU) from the star, taking 472 days to make one elliptical orbit.

    This object was discovered in Tautenburg, Germany in 2005.[12]

    References
    1. 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.
    2. Hatzes, A. P.; et al. (2005). "A giant planet around the massive giant star HD 13189". Astronomy and Astrophysics. 437 (2): 743–751. Bibcode:2005A&A...437..743H. doi:10.1051/0004-6361:20052850.
    3. Lee, B.-C.; et al. (May 2011). "A likely exoplanet orbiting the oscillating K-giant α Arietis". Astronomy & Astrophysics. 529: A134. arXiv:1104.4431. Bibcode:2011A&A...529A.134L. doi:10.1051/0004-6361/201016293.
    4. Famaey, B.; et al. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430 (1): 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
    5. Hatzes, Artie P.; Zechmeister, Mathias (October 2008). "Stellar oscillations in planet-hosting giant stars". Journal of Physics: Conference Series. 118 (1): 012016. Bibcode:2008JPhCS.118a2016H. doi:10.1088/1742-6596/118/1/012016.
    6. van Belle, Gerard T.; von Braun, Kaspar (April 2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. See Table 3 of the online data.
    7. Baines, Ellyn K.; et al. (June 2008). "CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars". The Astrophysical Journal. 680 (1): 728–733. arXiv:0803.1411. Bibcode:2008ApJ...680..728B. doi:10.1086/588009.
    8. Kim, J. H.; et al. (December 2005). "High-Resolution Spectroscopy of the Planetary Host HD 13189: Highly-Evolved and Metal-Poor". Bulletin of the American Astronomical Society. 37 (1): 1269. Bibcode:2006PhuZ...37....4.. doi:10.1002/piuz.200690006. Archived from the original on 2007-03-29.
    9. "HD 13189 -- Star". SIMBAD. Retrieved 2011-12-13.
    10. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
    11. "Notes for planet HD 13189 b". The Extrasolar Planets Encyclopaedia. Retrieved 2015-09-15.
    12. A Giant Planet Around The Massive Giant Star HD 13189 Archived 2015-07-20 at the Wayback Machine
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