WASP-63

Last updated
WASP-63
Observation data
Epoch J2000       Equinox J2000
Constellation Columba [1]
Right ascension 06h 17m 20.7485s [2]
Declination −38° 19′ 23.754″ [2]
Apparent magnitude  (V)11.10±0.08 [3]
Characteristics
Evolutionary stage subgiant [2] [3]
Spectral type G8 [4]
B−V color index 0.741±0.022 [5]
J−K color index 0.425±0.032 [5]
Astrometry
Radial velocity (Rv)−23.55±0.25 [2] km/s
Proper motion (μ)RA: −17.469 mas/yr [2]
Dec.: −27.292 mas/yr [2]
Parallax (π)3.4609±0.0118  mas [2]
Distance 942 ± 3  ly
(288.9 ± 1.0  pc)
Details
Mass 1.10+0.06
−0.04 [6]   M☉
Radius 1.76+0.11
−0.08 [6]   R☉
Luminosity 2.76 [2]   L☉
Surface gravity (log g)4.01±0.03 [7]   cgs
Temperature 5715±60 [7]   K
Metallicity [Fe/H]0.08±0.07 dex [6]
0.28±0.05 [7]   dex
Rotational velocity (v sin i)2.8±0.5 [6]  km/s
Age 8.3+1.3
−1.2 [6]   Gyr
Other designations
Kosjenka, CD−38 2551, TOI-483, WASP-63, TYC 7612-556-1, GSC 07612-00556, 2MASS J06172074-3819237 [8]
Database references
SIMBAD data
Exoplanet Archive data

WASP-63, also named Kosjenka, is a single star with an exoplanetary companion in the southern constellation of Columba. It is too faint to be visible with the naked eye, having an apparent visual magnitude of 11.1. [3] The distance to this system is approximately 942 light-years (289 parsecs ) based on parallax measurements, but it is drifting closer with a radial velocity of −24 km/s.

Contents

Nomenclature

The designation WASP-63 indicates that this was the 63rd star found to have a planet by the Wide Angle Search for Planets. It is also known as CD-38 2551 from the Durchmusterung catalog. [8]

In the 2019 NameExoWorlds campaign, this system was assigned to Malawi [9] [10] but did not get named at that time. It was then included among 20 systems to be named by the following NameExoWorlds campaign in August 2022. [11] The approved names, proposed by a team from Croatia, were announced in June 2023. WASP-63 is named Kosjenka and its planet is named Regoč, after characters from Croatian Tales of Long Ago by Ivana Brlić-Mažuranić. [12]

Stellar properties

This is a G-type star with a stellar classification of G8; [4] the luminosity class is currently unknown. The star is much older than the Sun at approximately 8.3+1.3
−1.2 billion years. WASP-63 is slightly enriched in heavy elements, having 120% of the solar abundance of iron. [6] The stellar radius is enlarged for a G8 star, [4] and models suggest it has evolved into a subgiant star. [2] It has 1.1 times the mass of the Sun and is spinning with a projected rotational velocity of 3 km/s. [6]

Planetary system

In 2012 a transiting gas giant planet WASP-63b was detected on a tight, circular orbit. [4] Its equilibrium temperature is 1536±37  K , and measured dayside temperature is 1547±308  K . [13] The planet is similar to Saturn in mass but is highly inflated due to proximity to the parent star. The planetary atmosphere contains water and likely has a high cloud deck of indeterminate composition. [14]

The WASP-63 planetary system [6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Regoč0.339±0.03  MJ 0.05417+0.00067
−0.00089		4.3780900±0.0000060.026+0.040
−0.029		87.8±1.3° 1.33±0.24  RJ

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 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.
  3. 1 2 3 Santos, N. C.; et al. (August 2013), "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets", Astronomy & Astrophysics, 556: 11, arXiv: 1307.0354 , Bibcode:2013A&A...556A.150S, doi:10.1051/0004-6361/201321286, S2CID   55237847, A150.
  4. 1 2 3 4 Hellier, Coel; et al. (2012), "Seven transiting hot-Jupiters from WASP-South, Euler and TRAPPIST: WASP-47b, WASP-55b, WASP-61b, WASP-62b, WASP-63b, WASP-66b & WASP-67b", Monthly Notices of the Royal Astronomical Society, 426 (1): 739–750, arXiv: 1204.5095 , Bibcode:2012MNRAS.426..739H, doi: 10.1111/j.1365-2966.2012.21780.x , S2CID   54713354
  5. 1 2 Brown, D. J. A. (2014), "Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?", Monthly Notices of the Royal Astronomical Society, 442 (2): 1844–1862, arXiv: 1406.4402 , Bibcode:2014MNRAS.442.1844B, doi: 10.1093/mnras/stu950 , S2CID   56052792.
  6. 1 2 3 4 5 6 7 8 Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv: 1704.00373 , Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID   118923163
  7. 1 2 3 Stassun, Keivan G.; et al. (2016), "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes", The Astronomical Journal, 153 (3): 136, arXiv: 1609.04389 , Bibcode:2017AJ....153..136S, doi: 10.3847/1538-3881/aa5df3 , S2CID   119219062
  8. 1 2 "CD-38 2551". SIMBAD . Centre de données astronomiques de Strasbourg.
  9. ↑ "Naming". WASP Planets. 24 June 2019. Retrieved 24 June 2025.
  10. ↑ "Malawi". NameExoWorlds . IAU. Archived from the original on 20 December 2019.
  11. ↑ "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
  12. ↑ "2022 Approved Names". NameExoWorlds . IAU . Retrieved 7 June 2023.
  13. ↑ Garhart, Emily; et al. (2020), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal, 159 (4): 137, arXiv: 1901.07040 , Bibcode:2020AJ....159..137G, doi: 10.3847/1538-3881/ab6cff , S2CID   119209434
  14. ↑ Kilpatrick, Brian M.; et al. (2017), "Community Targets of JWST's Early Release Science Program: Evaluation of WASP-63b", The Astronomical Journal, 156 (3): 103, arXiv: 1704.07421 , Bibcode:2018AJ....156..103K, doi: 10.3847/1538-3881/aacea7 , S2CID   52831173
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