WASP-49
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus |
| Right ascension | 06h 04m 21.47346s[1] |
| Declination | −16° 57′ 55.1088″[1] |
| Apparent magnitude (V) | 11.35[2] |
| Characteristics | |
| Spectral type | G6V[3] |
| Astrometry | |
| Radial velocity (Rv) | 41.25[1] km/s |
| Proper motion (μ) | RA: 54.769[1] mas/yr Dec.: -19.061[1] mas/yr |
| Parallax (π) | 5.1113 ± 0.0314 mas[1] |
| Distance | 638 ± 4 ly (196 ± 1 pc) |
| Details | |
| Mass | 0.72[4] M☉ |
| Radius | 1.038[3] R☉ |
| Luminosity | 0.884[1] L☉ |
| Surface gravity (log g) | 4.5[3] cgs |
| Temperature | 5,600[4] K |
| Age | 5.00[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Discovery[6] | |
|---|---|
| Discovered by | Monika Lendl et al. |
| Discovery date | 2011 |
| Primary Transit | |
| Orbital characteristics | |
| 0.0379±0.011 AU | |
| 2.7817387 day | |
| Inclination | 84.89±0.19 deg |
| Physical characteristics | |
| 1.115+0.047 −0.047 RJ | |
| Mass | 0.378+0.027 −0.027 MJ |
WASP-49 is a yellow dwarf main-sequence star. Its surface temperature is 5600 K. WASP-49 is depleted of heavy elements relative to Sun, with metallicity Fe/H index of -0.23, meaning it has an abundance of iron 59% of the Sun's level.
Planetary system
In 2011, one planet, named WASP-49b was discovered. In 2017, it 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 the planet.[7][8] The sodium envelope around WASP-49b could be due to an Io-like exomoon.[4][9] This new idea was called interesting, but also speculative.[10]
References
- ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ a b c d 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.; Pepe, F. (2017). "Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS)". Astronomy & Astrophysics. 602: A36. arXiv:1702.00448. doi:10.1051/0004-6361/201630063.
- ^ a b c d 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 (2019-08-28). "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.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ "WASP-49". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-29.
- ^ "European exoplanet catalog". Retrieved 2019-08-29.
- ^ 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; 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. arXiv:1908.00619. doi:10.3847/1538-3881/ab2986. hdl:10150/634666. ISSN 1538-3881.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ "Hubble Uncovers a 'Heavy Metal' Exoplanet Shaped Like a Football". HubbleSite.org. Retrieved 2020-01-01.
- ^ "Hints of a volcanically active exomoon". Portal. 2019-08-29. Retrieved 2020-01-01.
- ^ waspplanets (2019-09-02). "Hints of volcanic exo-moons?". WASP Planets. Retrieved 2020-01-01.
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