WASP-39

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WASP-39

A light curve for WASP-39, plotted from TESS data[1]
Observation data
J2000
Constellation Virgo[2]
Right ascension 14h 29m 18.41517s[3]
Declination −03° 26′ 40.2045″[3]
Apparent magnitude (V) 12.11[4]
Characteristics
Evolutionary stage main sequence[4]
Spectral type G8[4]
Variable type
planetary transit[5]
Distance
702 ± 2 ly
(215.4 ± 0.7 pc)
Details
Gyr
TIC 181949561, WASP-39, 2MASS J14291840-0326403[7]
Database references
Exoplanet Archive
data

WASP-39, also named Malmok, is a G-type main-sequence star about 702 light-years (215 parsecs) away in the constellation Virgo. With an apparent magnitude of 12.1, it is much too faint to be visible to the naked eye. The star is slightly smaller and cooler than the Sun. It hosts one known exoplanet, WASP-39b.

Nomenclature

The designation WASP-39 comes from the

variable star designation V732 Virginis.[5]

This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Aruba.[8] The approved names were Malmok for the star and Bocaprins for the planet, named after Malmok and Boca Prins, both beaches in Aruba.[9][10]

Planetary system

Main article: WASP-39b

The planet WASP-39b, later named Bocaprins, is a low-density

transit method.[4] Its orbit is aligned with the star's equator.[11] It has been a target for observation by the Hubble Space Telescope[12] and James Webb Space Telescope,[13] which have identified water vapor,[14] carbon dioxide,[15] and sulfur dioxide in its atmosphere.[16]

There is evidence of a possible

circumstellar disk around WASP-39, farther than 2 au from the star.[17]

The WASP-39 planetary system[18]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Bocaprins 0.275+0.042
−0.043 MJ 		0.04859+0.00051
−0.00053 		4.05529470(97) <0.048 87.83+0.25
−0.22° 		1.27±0.04 RJ

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 24 June 2025.
  2. doi:10.1086/132034
    . Constellation record for this object at VizieR.
  3. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  4. ^
    doi:10.1051/0004-6361/201116671
    .
  5. ^
    General Catalog of Variable Stars - VizieR
    . Retrieved 24 June 2025.
  6. doi:10.3847/1538-4365/acabc8
    .
  7. ^ "WASP-39". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 June 2025.
  8. ^ "Naming". WASP Planets. 24 June 2019. Retrieved 24 June 2025.
  9. ^ "Approved names". NameExoWorlds. IAU. Retrieved 24 June 2025.
  10. ^ "Aruba". NameExoWorlds. IAU. Retrieved 24 June 2025.
  11. doi:10.1051/0004-6361/201732234
    .
  12. doi:10.3847/0004-637X/827/1/19
    .
  13. doi:10.1038/s41550-024-02292-x
    .
  14. doi:10.3847/1538-3881/aa9e4e
    .
  15. PMID 36055338
    .
  16. PMID 37100917
    .
  17. doi:10.3847/2041-8213/ad4649
    .
  18. doi:10.1051/0004-6361/201629882
    .
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