WASP-49

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.

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[1] mas
Distance638 ± 4 ly
(196 ± 1 pc)
Details
Mass0.72[4] M☉
Radius1.038[3] R☉
Luminosity0.884[1] L☉
Surface gravity (log g)4.5[3] cgs
Temperature5,600[4] K
Age5.00[4] Gyr
Other designations
WDS J06044-1658A, TYC 5936-2086-1, 2MASS J06042146-1657550[5]
Database references
SIMBADdata
WASP-49b
Discovery[6]
Discovered byMonika Lendl et al.
Discovery date2011
Primary Transit
Orbital characteristics
0.0379±0.011 AU
2.7817387 day
Inclination84.89±0.19 deg
Physical characteristics
Mean radius
1.115+0.047
−0.047 RJ
Mass0.378+0.027
−0.027 MJ
Temperature1369±39[6]

    Planetary system

    In 2011, one planet, named WASP-49b was discovered.[7] 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.[8][9] The sodium envelope around WASP-49b could be due to an Io-like exomoon.[4][10] This new idea was called interesting, but also speculative.[11]

    The WASP-49 planetary system[6]
    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±0.0000056 <0.026 84.89±0.19° 1.115±0.047 RJ

    References
    1. 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.
    2. 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.
    3. 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. S2CID 55988055.
    4. 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. S2CID 201651224.
    5. "WASP-49". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-29.
    6. The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets, 2017, arXiv:1704.00373
    7. WASP-42 b and WASP-49 b: two new transiting sub-Jupiters, 2012, arXiv:1205.2757
    8. 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. S2CID 199405274.
    9. "Hubble Uncovers a 'Heavy Metal' Exoplanet Shaped Like a Football". HubbleSite.org. Retrieved 2020-01-01.
    10. "Hints of a volcanically active exomoon". Portal. 2019-08-29. Retrieved 2020-01-01.
    11. waspplanets (2019-09-02). "Hints of volcanic exo-moons?". WASP Planets. Retrieved 2020-01-01.

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