WASP-49b
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| Discovery | |
|---|---|
| Discovery date | 2012 |
| Orbital characteristics | |
| 0.0379+0.0010 −0.0011 AU | |
| Eccentricity | <0.026 |
| 2.781 d | |
| Inclination | 84.89±0.19 |
| Physical characteristics | |
Mean radius | 1.115±0.047 |
| Mass | 0.399+0.029 −0.027 |
| Temperature | 1369±39 K |
WASP-49b is a hot-Jupiter exoplanet orbiting the Sun-like star WASP-49 A. It is about 40% the mass of Jupiter and has an equilibrium temperature of 1369±39 K.[1] The planet was discovered to be surrounded by a sodium envelope, which could indicate the presence of a potential exomoon.[2]
Characteristics[edit]
WASP-49b was found to possess an extensive sodium envelope in 2017.[2] Additionally, the Hubble Space Telescope found clear absorption features in near-UV light, indicating the presence of magnesium and iron. These metals may not be gravitationally bound to the planet, but could be magnetically confined to it.[3] WASP-49b has an equilibrium temperature of 1369±39 K, making it a hot-Jupiter or hot-Saturn planet.
Potential exomoon[edit]
The existence of a sodium envelope around WASP-49b could be explained by the presence of a volcanically active, Io-like exomoon.[4] However, this idea remains speculative. Additionally, 3 sodium "booms" were detected over a period of 40 minutes each, as well as Doppler-shifts of the planet indicative of a third body orbiting WASP-49b with a period of 8 hours, near the planet's Roche limit.[5]
References[edit]
- ↑ Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Segransan, D.; Smith, A. M. S. (August 2012). "WASP-42 b and WASP-49 b: two new transiting sub-Jupiters". Astronomy & Astrophysics. 544: A72. arXiv:1205.2757. Bibcode:2012A&A...544A..72L. doi:10.1051/0004-6361/201219585. ISSN 0004-6361.
- ↑ 2.0 2.1 Wyttenbach, A.; Lovis, C.; Ehrenreich, D.; Bourrier, V.; Pino, L.; Allart, R.; Astudillo-Defru, N.; Cegla, H. M.; Heng, K.; Lavie, B.; Melo, C.; Murgas, F.; Santerne, A.; Ségransan, D.; Udry, S. (June 2017). "Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) I. Detection of hot neutral sodium at high altitudes on WASP-49b". Astronomy & Astrophysics. 602: A36. arXiv:1702.00448. Bibcode:2017A&A...602A..36W. doi:10.1051/0004-6361/201630063. ISSN 0004-6361.
- ↑ Sing, David K.; Lavvas, Panayotis; Ballester, Gilda E.; Etangs, Alain Lecavelier des; Marley, Mark S.; Nikolov, Nikolay; Ben-Jaffel, Lotfi; Bourrier, Vincent; Buchhave, Lars A.; Deming, Drake L.; Ehrenreich, David; Mikal-Evans, Thomas; Kataria, Tiffany; Lewis, Nikole K.; Lopez-Morales, Mercedes (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. arXiv:1908.00619. doi:10.3847/1538-3881/ab2986. ISSN 0004-6256.
- ↑ Oza, Apurva V.; Johnson, Robert E.; Lellouch, Emmanuel; Schmidt, Carl; Schneider, Nick; Huang, Chenliang; Gamborino, Diana; Gebek, Andrea; Wyttenbach, Aurelien; Demory, Brice-Olivier; Mordasini, Christoph; Saxena, Prabal; Dubois, David; Moullet, Arielle; Thomas, Nicolas (2019-11-10). "Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets". The Astrophysical Journal. 885 (2): 168. arXiv:1908.10732. Bibcode:2019ApJ...885..168O. doi:10.3847/1538-4357/ab40cc. ISSN 0004-637X.
- ↑ "PARALLEL SESSIONS - Exoplanets 5". 2024-03-11. Retrieved 2024-04-15.
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