WASP-159

Last updated
WASP-159
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension 04h 32m 32.75581s [1]
Declination −38° 58′ 05.9529″ [1]
Apparent magnitude  (V)12.84±0.24 [2]
Characteristics
Evolutionary stage subgiant [1]
Spectral type F9 [3]
B−V color index −0.21 [2]
Astrometry
Radial velocity (Rv)35.16±0.01 [3] km/s
Proper motion (μ)RA: −0.586 mas/yr [1]
Dec.: +5.347 mas/yr [1]
Parallax (π)1.3723±0.0098  mas [1]
Distance 2,380 ± 20  ly
(729 ± 5  pc)
Details [3]
Mass 1.41±0.12  M☉
Radius 2.11±0.10  R☉
Luminosity 4.674+0.064
−0.053 [1]   L☉
Surface gravity (log g)3.94±0.04  cgs
Temperature 6,120±140  K
Metallicity [Fe/H]+0.22±0.12  dex
Rotational velocity (v sin i)5.7±0.4 km/s
Age 3.40±0.95  Gyr
Other designations
TOI-1903
Database references
SIMBAD data
Exoplanet Archive data

WASP-159 is a star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 12.84, [2] making it readily visible in telescopes with an aperture of at least four inches, but not to the naked eye. The star is located relatively far at a distance of 2,380 light-years based on recent parallax measurements from the Gaia spacecraft, [1] but it is receding with a heliocentric radial velocity of 35.2  km/s . [3]

WASP-159 has a stellar classification of F9 indicating that it is a late F-type star. [3] It appears to be ceasing hydrogen fusion at its core and evolving towards the red giant branch. [3] It has 1.41 times the Sun's mass and 2.11 times the radius of the Sun. [3] It radiates 4.674 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,120  K , [3] giving it a whitish-yellow hue when viewed in a telescope. WASP-159 is metal enriched with an iron abundance 166% that of the Sun, and it is estimated to be 3.4 billion years old. [3]

Planetary system

In 2019, SuperWASP discovered a transiting exoplanet orbiting the star after spectral and radial velocity observations. WASP-159b is a "bloated" hot Jupiter that takes roughly 3.8 days to revolve around its host star in a circular orbit. [3]

The WASP-159 planetary system [3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.55±0.08  MJ 0.0538±0.00153.8404008+0.0000063
−0.0000064		0.00 (fixed)88.1±1.4 ° 1.38±0.09  RJ

References

  1. 1 2 3 4 5 6 7 8 9 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.
  2. 1 2 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  3. 1 2 3 4 5 6 7 8 9 10 11 Hellier, Coel; Anderson, D. R.; Bouchy, F.; Burdanov, A.; Collier Cameron, A.; Delrez, L.; Gillon, M.; Jehin, E.; Lendl, M.; Nielsen, L. D.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Triaud, A. H. M. J.; Udry, S.; West, R. G. (1 January 2019). "New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE, and TRAPPIST-South". Monthly Notices of the Royal Astronomical Society. 482 (1): 1379–1391. arXiv: 1803.02224 . Bibcode:2019MNRAS.482.1379H. doi: 10.1093/mnras/sty2741 . ISSN   0035-8711.
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