WASP-49

Coordinates: Sky map 6h 4m 21.462s, −16° 57′ 55.06″
Source: Wikipedia, the free encyclopedia.
WASP-49
Observation data
Epoch J2000      Equinox J2000
Constellation Lepus
Right ascension 06h 04m 21.47357s[1]
Declination −16° 57′ 55.1087″[1]
Apparent magnitude (V) 11.35[2]
Characteristics
Spectral type G6V[3]
Distance
636 ± 2 ly
(194.9 ± 0.6 pc)
Details
A
Gyr
B
Mass0.337+0.009
−0.024[6] M☉
Temperature3454+10
−25[6] K
TYC 5936-2086-1, 2MASS J06042146-1657550[7]
Database references
SIMBADA
B

WASP-49 is a binary star system about 636 light-years (195 parsecs) away in the constellation Lepus. The two stars are separated by 443 AU.[6] The primary is a G-type main-sequence star, with a surface temperature of 5,600 K (5,330 °C; 9,620 °F). WASP-49 is depleted of heavy elements relative to the Sun. It has a metallicity Fe/H index of –0.23, meaning it has 59% the iron level of the Sun.[5]

Planetary system

In 2012, one

equilibrium temperature of 1369±39 K.[8]

In 2017, WASP-49b was found to have an extensive sodium envelope.[3] A study in 2019 using data from the Hubble Space Telescope in near-UV found clear absorption features caused by metals, including magnesium and iron. The magnesium and iron gas is not gravitationally bound to the planet, but could be magnetically confined to it.[9][10] The sodium envelope around WASP-49b could be due to an Io-like exomoon.[11][12] This idea, however, is speculative.[13]

The WASP-49 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.399+0.029
−0.027 MJ 		0.0379+0.0010
−0.0011 		2.7817387(56) <0.026 84.89±0.19° 1.115±0.047 RJ

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. Bibcode:2000A&A...355L..27H
    .
  3. ^
    S2CID 55988055
    .
  4. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  5. ^
    S2CID 118923163
  6. ^
    doi:10.1093/mnras/stz2673
    .
  7. ^ "WASP-49". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-29.
  8. ^
    S2CID 54186638
  9. S2CID 199405274
    .
  10. ^ "Hubble Uncovers a 'Heavy Metal' Exoplanet Shaped Like a Football". HubbleSite.org. Retrieved 2020-01-01.
  11. S2CID 201651224
    .
  12. ^ "Hints of a volcanically active exomoon". Portal. 2019-08-29. Retrieved 2020-01-01.
  13. ^ waspplanets (2019-09-02). "Hints of volcanic exo-moons?". WASP Planets. Retrieved 2020-01-01.


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