HD 118203

Last updated
HD 118203 / Liesma
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Ursa Major
Right ascension 13h 34m 02.5394s [1]
Declination +53° 43′ 42.6984″ [1]
Apparent magnitude  (V)8.06 [2]
Characteristics
Spectral type G0V [3]
B−V color index 0.699±0.012 [4]
Astrometry
Radial velocity (Rv)−29.07±0.24 [4]  km/s
Proper motion (μ)RA: −85.877±0.052 [1]   mas/yr
Dec.: −78.913±0.038 [1]   mas/yr
Parallax (π)10.8102 ± 0.0275  mas [1]
Distance 301.7 ± 0.8  ly
(92.5 ± 0.2  pc)
Absolute magnitude  (MV)3.32 [2]
Details [5]
Mass 1.23±0.03  M☉
Radius 2.00±0.10  R☉
Luminosity 3.80±0.30  L☉
Surface gravity (log g)3.93±0.02  cgs
Temperature 5,741±35  K
Metallicity [Fe/H]0.16 [2]   dex
Rotational velocity (v sin i)7.0 [2]  km/s
Age 5.4±0.5  Gyr
Other designations
BD+54°1609, HD  118203, HIP  66192, SAO  28802, [6] TOI 1271
Database references
SIMBAD The star
planet b
Exoplanet Archive data

HD 118203 is a star with an orbiting exoplanet located in the northern circumpolar constellation of Ursa Major. It has the proper name Liesma, which means flame, and it is the name of a character from the Latvian poem Staburags un Liesma (Staburags and Liesma). The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU. [7] [8]

Contents

The apparent visual magnitude of HD 118203 is 8.06, [2] which means it is invisible to the naked eye but it can be seen using binoculars or a telescope. Based on parallax measurements, it is located at a distance of 302  light years from the Sun. [1] The star is drifting closer with a radial velocity of −29 km/s. [4] Based on its position and space velocity this is most likely (97% chance) an older thin disk star. [9] An exoplanet has been detected in a close orbit around the star. [10]

The spectrum of HD 118203 matches a G-type main-sequence star with a class of G0V. [3] It has a low level of chromospheric activity, which means a low level of radial velocity jitter for planet detection purposes. [10] The star has 1.23 [5] times the mass of the Sun and double the Sun's radius. It is around 5.4 billion years old and is spinning with a projected rotational velocity of 7.0 km/s. [2] HD 118203 is radiating 3.8 times the luminosity of the Sun from its photosphere at an effective temperature of 5,741 K. [5]

Exoplanet

In 2006, a hot Jupiter candidate was reported in an eccentric orbit around this star. It was discovered using the radial velocity method based on observation of high-metallicity stars begun in 2004. [10] In 2020, it was found that this is a transiting planet, which allowed the mass and radius of the body to be determined. This exoplanet has more than double the mass of Jupiter and a 13% greater radius. It is named Staburags. The fact that the parent star is among the brighter known planet hosts (as of 2020) makes it an interesting object for further study. [9]

The HD 118203 planetary system [9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Staburags 2.173+0.077
−0.080  MJ 		0.07082+0.00095
−0.00110		6.134980+0.000038
−0.000037		0.316±0.02188.75+0.86
−1.0 ° 		1.133+0.031
−0.030  RJ

See also

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References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 6 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv: 1611.02897 . Bibcode:2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21 . S2CID   119511744. 21.
  3. 1 2 Grieves, N.; et al. (December 2018). "Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey". Monthly Notices of the Royal Astronomical Society. 481 (3): 3244–3265. arXiv: 1803.11538 . Bibcode:2018MNRAS.481.3244G. doi:10.1093/mnras/sty2431.
  4. 1 2 3 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.
  5. 1 2 3 Bonfanti, A.; et al. (2015). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: A5. arXiv: 1511.01744 . Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID   53971692.
  6. ↑ "HD 118203". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-10-13.
  7. ↑ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  8. ↑ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  9. 1 2 3 Pepper, Joshua; et al. (2020). "TESS Reveals HD 118203 b to be a Transiting Planet". The Astronomical Journal. 159 (6): 243. arXiv: 1911.05150 . Bibcode:2020AJ....159..243P. doi: 10.3847/1538-3881/ab84f2 . S2CID   207930540.
  10. 1 2 3 da Silva, R.; et al. (2006). "Elodie metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD118203 and HD149143". Astronomy and Astrophysics. 446 (2): 717–722. arXiv: astro-ph/0510048 . Bibcode:2006A&A...446..717D. doi:10.1051/0004-6361:20054116. S2CID   18907493.
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