G-type star in the constellation Virgo
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 Wide Angle Search for Planets . Since the planet transits the star, the star is classified as a planetary transit variable and has received 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] Malmok and Boca Prins , both beaches in Aruba.[ 9] [ 10]
Planetary system
The planet WASP-39b, later named Bocaprins, is a low-density hot Jupiter , about the mass of Saturn but larger, discovered in 2011 by the Wide Angle Search for Planets using the transit method .[ 4] [ 11] Hubble Space Telescope [ 12] James Webb Space Telescope ,[ 13] water vapor ,[ 14] carbon dioxide ,[ 15] sulfur dioxide in its atmosphere.[ 16]
There is evidence of a possible circumstellar disk around WASP-39, farther than au [ 17]
References
^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved 24 June 2025 .^ 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 .^ a b c d e 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 .^ a b c d e Faedi, F.; Barros, S. C. C.; et al. (July 2011). "WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star" . Astronomy & Astrophysics 531 : A40. arXiv :1102.1375 Bibcode :2011A&A...531A..40F . doi :10.1051/0004-6361/201116671 ^ a b "V732 Vir" . General Catalog of Variable Stars - VizieR . Retrieved 24 June 2025 .^ Yu, Jie; Khanna, Shourya; Themessl, Nathalie; Hekker, Saskia; Dréau, Guillaume; Gizon, Laurent; Bi, Shaolan (2023). "Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE" . The Astrophysical Journal Supplement Series . 264 (2): 41. arXiv :2206.00046 Bibcode :2023ApJS..264...41Y . doi :10.3847/1538-4365/acabc8 ^ "WASP-39" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 24 June 2025 .^ "Naming" . WASP Planets . 24 June 2019. Retrieved 24 June 2025 .^ "Approved names" . NameExoWorlds IAU . Retrieved 24 June 2025 .^ "Aruba" . NameExoWorlds IAU . Retrieved 24 June 2025 .^ Mancini, L.; Esposito, M.; et al. (May 2018). "The GAPS programme with HARPS-N at TNG. XVI. Measurement of the Rossiter-McLaughlin effect of transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39, and WASP-60" . Astronomy & Astrophysics 613 : A41. arXiv :1802.03859 Bibcode :2018A&A...613A..41M . doi :10.1051/0004-6361/201732234 ^ Fischer, Patrick D.; Knutson, Heather A.; et al. (August 2016). "HST Hot-Jupiter Transmission Spectral Survey: Clear Skies for Cool Saturn WASP-39b" . The Astrophysical Journal 827 (1): 19. arXiv :1601.04761 Bibcode :2016ApJ...827...19F . doi :10.3847/0004-637X/827/1/19 ^ Carter, A. L.; May, E. M.; et al. (August 2024). "A benchmark JWST near-infrared spectrum for the exoplanet WASP-39 b" . Nature Astronomy 8 (8): 1008– 1019. arXiv :2407.13893 Bibcode :2024NatAs...8.1008C . doi :10.1038/s41550-024-02292-x ^ Wakeford, H. R.; Sing, D. K.; et al. (January 2018). "The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint" . The Astronomical Journal 155 (1): 29. arXiv :1711.10529 Bibcode :2018AJ....155...29W . doi :10.3847/1538-3881/aa9e4e ^ Ahrer, Eva-Maria; et al. (JWST Transiting Exoplanet Community Early Release Science Team) (February 2023). "Identification of carbon dioxide in an exoplanet atmosphere" . Nature 614 (7949): 649– 652. arXiv :2208.11692 Bibcode :2023Natur.614..649J . doi :10.1038/s41586-022-05269-w PMC 9946830 PMID 36055338 . ^ Tsai, Shang-Min; Lee, Elspeth K. H.; et al. (May 2023). "Photochemically produced SO2 in the atmosphere of WASP-39b" . Nature 617 (7961): 483– 487. arXiv :2211.10490 Bibcode :2023Natur.617..483T . doi :10.1038/s41586-023-05902-2 PMC 10191860 PMID 37100917 . ^ Flagg, Laura; Weinberger, Alycia J.; et al. (July 2024). "Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39" . The Astrophysical Journal Letters 969 (1): L1. arXiv :2406.02305 Bibcode :2024ApJ...969L..19F . doi :10.3847/2041-8213/ad4649 ^ Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets" . Astronomy & Astrophysics 602 : A107. arXiv :1704.00373 Bibcode :2017A&A...602A.107B . doi :10.1051/0004-6361/201629882
