Astronomy:WASP-63

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Short description: Star in the constellation Columba
WASP-63
Observation data
Equinox J2000.0]] (ICRS)
Constellation Columba
Right ascension  06h 17m 20.7485s[1]
Declination −38° 19′ 23.754″[1]
Apparent magnitude (V) 11.10±0.08[2]
Characteristics
Evolutionary stage subgiant[1][2]
Spectral type G8[3]
B−V color index 0.741±0.022[4]
J−K color index 0.425±0.032[4]
Astrometry
Radial velocity (Rv)−23.55±0.25[1] km/s
Proper motion (μ) RA: −17.469[1] mas/yr
Dec.: −27.292[1] mas/yr
Parallax (π)3.4609 ± 0.0118[1] mas
Distance942 ± 3 ly
(288.9 ± 1.0 pc)
Details
Mass1.10+0.06−0.04[5] M☉
Radius1.76+0.11−0.08[5] R☉
Luminosity2.76[1] L☉
Surface gravity (log g)4.01±0.03[6] cgs
Temperature5715±60[6] K
Metallicity [Fe/H]0.08±0.07 dex[5]
0.28±0.05[6] dex
Rotational velocity (v sin i)2.8±0.5[5] km/s
Age8.3+1.3−1.2[5] Gyr
Other designations
Kosjenka, CD−38 2551, TYC 7612-556-1, GSC 07612-00556, 2MASS J06172074-3819237[7]
Database references
SIMBADdata

WASP-63 or Kosjenka, also known as CD-38 2551, 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.[2] 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.

Nomenclature

The designation WASP-63 indicates that this was the 63rd star found to have a planet by the Wide Angle Search for Planets.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[8] 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.[9]

Stellar properties

This is a G-type star with a stellar classification of G8;[3] 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.[5] The stellar radius is enlarged for a G8 star,[3] and models suggest it has evolved into a subgiant star.[1] It has 1.1 times the mass of the Sun and is spinning with a projected rotational velocity of 3 km/s.[5]

Planetary system

In 2012 a transiting gas giant planet WASP-63b was detected on a tight, circular orbit.[3] Its equilibrium temperature is 1536±37 K, and measured dayside temperature is 1547±308 K.[10] 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.[11]

The WASP-63 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Regoč 0.339±0.03 MJ 0.05417+0.00067−0.00089 4.3780900±0.000006 0.026+0.040−0.029 87.8±1.3° 1.33±0.24 RJ

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 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, doi:10.1051/0004-6361/201321286, A150, Bibcode: 2013A&A...556A.150S. 
  3. ↑ 3.0 3.1 3.2 3.3 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, doi:10.1111/j.1365-2966.2012.21780.x, Bibcode: 2012MNRAS.426..739H 
  4. ↑ 4.0 4.1 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, doi:10.1093/mnras/stu950, Bibcode: 2014MNRAS.442.1844B. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Bonomo, A. S. et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics 602: A107, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B 
  6. ↑ 6.0 6.1 6.2 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, doi:10.3847/1538-3881/aa5df3, Bibcode: 2017AJ....153..136S 
  7. ↑ "CD-38 2551". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CD-38+2551. 
  8. ↑ "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds. 
  9. ↑ "2022 Approved Names". IAU. https://www.nameexoworlds.iau.org/2022approved-names. 
  10. ↑ Garhart, Emily et al. (2020), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal 159 (4): 137, doi:10.3847/1538-3881/ab6cff, Bibcode: 2020AJ....159..137G 
  11. ↑ 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, doi:10.3847/1538-3881/aacea7, Bibcode: 2018AJ....156..103K 

Coordinates: Sky map 06h 17m 20.7486s, −38° 19′ 23.7542″



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