WASP-6b, also named Boinayel, is an
exoplanet approximately 650 light years away in the constellation
Aquarius. It was discovered in 2008, by the
WASP survey, by
astronomical transit across its parent star
WASP-6. This planet orbits at only 4% of the
Earth-
Sun distance. The planet has a mass half that of Jupiter, but its
insolation has forced a
thermal expansion of its radius to greater than that of Jupiter.[1] Thus, this planet is an inflated
hot Jupiter.[1][4]Starspots on the host star WASP-6 helped to refine the measurements of the mass and the radius of the planet.[5]
Naming
In 2019 the
IAU announced as part of
NameExoWorlds that WASP-6 and its planet WASP-6b would be given official names chosen by school children from
The Dominican Republic.[6][7] The planet WASP-6b is named Boinayel.
Boinayel is a
Taino deity of rain, that fertilizes the soil.[8][9]
Orbit
A study in 2012, utilizing the
Rossiter–McLaughlin effect, determined that the planetary orbit is probably aligned with the equatorial plane of the star, with misalignment equal to -11+18 −14°.[10]
Atmosphere
Observations with the
Magellan Telescope in 2013 studied the transits in different wavelengths. The study observed a decrease in transit depth as a function of wavelength, characteristic of a scattering
haze. No spectral features were detected.[11] A study in 2015 using
Hubble Space Telescope and
Spitzer Space Telescope data also found evidence of a scattering haze, but it found tentative evidence for
sodium and
potassium.[12] A study in 2015, using the Spitzer Space Telescope detected the eclipse of the planet behind the host star. The study found a dayside temperature of 1235+70 −77K (962+70 −77°C) and 1118+68 −74 K (845+68 −74 °C) for the 3.6 and 4.5 μm channels respectively.[3] A study from 2019 using data from ground based observatories, such as the
Very Large Telescope and space telescopes, such as the
Transiting Exoplanet Survey Satellite analysed the atmosphere of WASP-6b. This study confirmed the presence of sodium and potassium in the atmosphere. The study also found
water vapour in the atmosphere of the planet. The study came to the conclusion that despite the presence of a haze in the atmosphere of WASP-6b, the planet remains a favourable object for future atmospheric characterisation with missions such as
JWST.[13][4]
^Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments", The Astrophysical Journal, 757 (1): 18,
arXiv:1206.6105,
Bibcode:
2012ApJ...757...18A,
doi:
10.1088/0004-637X/757/1/18,
S2CID17174530
^Jordán, Andrés; Espinoza, Néstor; Rabus, Markus; Eyheramendy, Susana; Sing, David K.; Désert, Jean-Michel; Bakos, Gáspár Á.; Fortney, Jonathan J.; López-Morales, Mercedes; Maxted, Pierre F. L.; Triaud, Amaury H. M. J.; Szentgyorgyi, Andrew (2013-11-13). "A GROUND-BASED OPTICAL TRANSMISSION SPECTRUM OF WASP-6b". The Astrophysical Journal. 778 (2): 184.
arXiv:1310.6048.
Bibcode:
2013ApJ...778..184J.
doi:
10.1088/0004-637x/778/2/184.
ISSN0004-637X.
S2CID34113793.
^Nikolov, N.; Sing, D. K.; Burrows, A. S.; Fortney, J. J.; Henry, G. W.; Pont, F.; Ballester, G. E.; Aigrain, S.; Wilson, P. A.; Huitson, C. M.; Gibson, N. P.; Désert, J.-M.; Lecavelier des Etangs, A.; Showman, A. P.; Vidal-Madjar, A.; Wakeford, H. R.; Zahnle, K. (2015-02-11). "HST hot-Jupiter transmission spectral survey: haze in the atmosphere of WASP-6b". Monthly Notices of the Royal Astronomical Society. 447 (1): 463–478.
arXiv:1411.4567.
Bibcode:
2015MNRAS.447..463N.
doi:
10.1093/mnras/stu2433.
ISSN0035-8711.
S2CID12031486.