Astronomy:WASP-49

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Short description: Star in the constellation Lepus
WASP-49
Observation data
Equinox J2000.0]] (ICRS)
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
Orbital period2.7817387 day
Inclination84.89±0.19 deg
Physical characteristics
Mean radius1.115+0.047
−0.047 RJ
Mass0.378+0.027
−0.027 MJ
Physics1369±39[6]


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.[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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 3.3 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. 
  4. ↑ 4.0 4.1 4.2 4.3 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. 
  5. ↑ "WASP-49". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-49. 
  6. ↑ 6.0 6.1 6.2 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 
  7. ↑ 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 
  8. ↑ 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. 
  9. ↑ "Hubble Uncovers a 'Heavy Metal' Exoplanet Shaped Like a Football" (in en). http://hubblesite.org/contents/news-releases/2019/news-2019-19. 
  10. ↑ "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. 
  11. ↑ waspplanets (2019-09-02). "Hints of volcanic exo-moons?" (in en). https://wasp-planets.net/2019/09/02/hints-of-volcanic-exo-moons/. 

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




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