WASP-49

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.[1] 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.[2]

## Planetary system

In 2012, one exoplanet, designated WASP-49b, was discovered around the primary star by a team led by Monika Lendl.[3] This is a hot Jupiter with an equilibrium temperature of 1369±39 K.[3]

In 2017, WASP-49b was found to have an extensive sodium envelope.[4] 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 gaseous magnesium and iron is not gravitationally bound to the planet, but could be magnetically confined to it.[5][6] The sodium layer around WASP-49b could be due to a tidally-heated Io-like exomoon.[7][8] In October 2024, a 5-year study was published indicating that the sodium envelope most likely comes from a distinct body orbiting WASP-49b rather than the star or the planet, although the exact dynamics of the envelope remains to be settled.[9][10]

The WASP-49 A planetary system[2] 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. ↑ Mugrauer, M. (December 2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088–5102. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M.
2. ↑ 2.0 2.1 Bonomo, A. S. et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics 602: A107, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B
3. ↑ 3.0 3.1 Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A. et al. (2012), "WASP-42 b and WASP-49 b: Two new transiting sub-Jupiters", Astronomy & Astrophysics 544: A72, doi:10.1051/0004-6361/201219585, Bibcode: 2012A&A...544A..72L
4. ↑ Wyttenbach, A.; Lovis, C.; Ehrenreich, D.; Bourrier, V.; Pino, L.; Allart, R.; Astudillo-Defru, N.; Cegla, H. M. et al. (2017). "Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS)". Astronomy & Astrophysics 602: A36. doi:10.1051/0004-6361/201630063. Bibcode: 2017A&A...602A..36W.
5. ↑ Sing, David K. et al. (2019-08-01). "The HST PanCET Program: Exospheric Mg II and Fe II in the Near-UV transmission spectrum of WASP-121b using Jitter Decorrelation". The Astronomical Journal 158 (2): 91. doi:10.3847/1538-3881/ab2986. ISSN 1538-3881.
6. ↑ "Hubble Uncovers a 'Heavy Metal' Exoplanet Shaped Like a Football" (in en). http://hubblesite.org/contents/news-releases/2019/news-2019-19.
7. ↑ Oza, Apurva V.; Johnson, Robert E.; Lellouch, Emmanuel; Schmidt, Carl; Schneider, Nick; Huang, Chenliang; Gamborino, Diana; Gebek, Andrea et al. (2019-08-28). "Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets". The Astrophysical Journal 885 (2): 168. doi:10.3847/1538-4357/ab40cc. Bibcode: 2019ApJ...885..168O.
8. ↑ "Hints of a volcanically active exomoon". 2019-08-29. https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2019/medienmitteilungen_2019/hints_of_a_volcanically_active_exomoon/index_eng.html.
9. ↑ Cowing, Keith (October 2024). "Does Distant Planet WASP-49 b Host Volcanic Moon Like Jupiter's Io?" (in en-US). https://astrobiology.com/2024/10/does-distant-planet-wasp-49-b-host-volcanic-moon-like-jupiters-io.html.
10. ↑ Oza, Apurva V.; Seidel, Julia V.; Hoeijmakers, H. Jens; Unni, Athira; Kesseli, Aurora Y.; Schmidt, Carl A.; Sivarani, Thirupathi; Bello-Arufe, Aaron et al. (2024-10-01). "Redshifted Sodium Transient near Exoplanet Transit". The Astrophysical Journal Letters 973 (2): L53. doi:10.3847/2041-8213/ad6b29. ISSN 2041-8205. Bibcode: 2024ApJ...973L..53O.

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## Further reading

* Unni, Athira et al. (June 2025). "Doppler shifted transient sodium detection by KECK/HIRES". Monthly Notices of the Royal Astronomical Society: Letters 540 (1): L48–L53. doi:10.1093/mnrasl/slaf031. Bibcode: 2025MNRAS.540L..48U.

Coordinates:  6h 4m 21.462s, −16° 57′ 55.06″

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* t
* e

Constellation of Lepus

* Lepus in Chinese astronomy
* List of star names in Lepus
* List of stars in Lepus

Stars|

| Bayer|

* α (Arneb)
* β (Nihal)
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν

|

Flamsteed|

* 1
* 8
* 10
* 12
* 17
* 19
* 4 Mon

Variable|

* R
* S
* T
* U
* RS
* RX
* RY
* TW
* TX
* UV
* YY
* YZ
* AC
* AF
* AK

HR|

* 1604
* 1621
* 1628
* 1640
* 1645
* 1655
* 1661
* 1665
* 1694
* 1710
* 1723
* 1737
* 1747
* 1762
* 1771
* 1785
* 1792
* 1812
* 1823
* 1919
* 1944
* 1962
* 1965
* 1975
* 1980
* 2000
* 2021
* 2026
* 2036
* 2065
* 2086
* 2090
* 2129
* 2136
* 2140
* 2163
* 2180
* 2182
* 2183
* 2186
* 2192
* 2200
* 2206

HD|

* 31527
* 32450
* 33095
* 33142
* 33162
* 33238
* 33283
* 34318
* 35137

Other|

* 2MASS J0523−1403
* Gliese 229
* WASP-49
* WASP-61

| Exoplanets|

* HD 33283 b

|

| Star clusters|

* Messier 79

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| Nebulae|

* Abell 7
* IC 418

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Galaxies|

| NGC|

* NGC 1964
* NGC 1979
* NGC 1993

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