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WASP-49

Topic: Astronomy

 From HandWiki - Reading time: 5 min

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

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



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