WASP-39b

WASP-39b
Exoplanet List of exoplanets

Exoplanet WASP-39b found to contain substantial amounts of water in its atmosphere. (artist concept)[1]
Parent star
Star WASP-39[2]
Constellation Virgo[1]
Right ascension (α) 14h 29m 18.0s[2]
Declination (δ) −03° 26′ 40″[2]
Apparent magnitude (mV) 12.11[2]
Distance700[1] ly
(230[2] pc)
Spectral type G8[2]
Mass (m) 0.93±0.03[2] M☉
Orbital elements
Semi-major axis(a) 0.0486±0.0005[2] AU
Eccentricity (e) 0[2]
Orbital period(P) 4.05526[2] d
Inclination (i) 87.83±0.25[2]°
Physical characteristics
Mass(m)0.28±0.03[2] MJ
Radius(r)1.27±0.04[2] RJ
Density(ρ)180±40 kg m−3
Discovery information
Discovery date 2011[2]
Discoverer(s)
Discovery method Primary transit[2]
Discovery site WASP[2]
Discovery status Confirmed[2]
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

WASP-39b is a "hot Saturn" extrasolar planet discovered in 2011 by the WASP project, notable for containing a substantial amount of water in its atmosphere.[1][3][4][5] WASP-39b is in the Virgo constellation, and is about 700 light-years from Earth.[1]

Characteristics

Comparison of "hot Jupiter" exoplanets, including WASP-39b (top row; 4th from left) (artist concept)
From top left to lower right: WASP-12b, WASP-6b, WASP-31b, WASP-39b, HD 189733b, HAT-P-12b, WASP-17b, WASP-19b, HAT-P-1b and HD 209458b.

WASP-39b has a mass of about 0.28 times that of Jupiter and a radius about 1.27 times that of Jupiter.[2] The exoplanet orbits WASP-39, its host star, every 4 days.[1] Hot water molecules were found in the atmosphere of WASP-39b in a 2018 study.[1]

WASP-39b is also notable for having an extremely low density, near that of WASP-17b, the least dense known exoplanet. While WASP-17b has a density of 0.13±0.06 g/cm3, WASP-39b has a slightly higher density of 0.18±0.04 g/cm3.

See also

References

  1. 1 2 3 4 5 6 7 Cofield, Calla; Jenkins, Ann; Villard, Ray (1 March 2018). "NASA Finds a Large Amount of Water in an Exoplanet's Atmosphere". NASA. Retrieved 3 March 2018.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 "Planet WASP-39 b". Extrasolar Planets Encyclopaedia. 2018. Retrieved 1 March 2018.
  3. ↑ H. R. Wakeford, D. K. Sing, D. Deming, et al (21 December 2017). "The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint". The Astronomical Journal. 155 (1). Retrieved 1 March 2018.
  4. ↑ "NASA finds a large amount of water in an exoplanet's atmosphere". Phys.org. 1 March 2018. Retrieved 1 March 2018.
  5. ↑ MacDonald, Cheyenne (1 March 2018). "Saturn-sized exoplanet 700 light-years away has WATER in its atmosphere, NASA reveals". Daily Mail. Retrieved 1 March 2018.

Media related to WASP-39b at Wikimedia Commons

Coordinates: 14h 29m 18.0s, −03° 26′ 40″

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