Astronomy:WASP-3

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WASP-3 is a triple star system located about 753 light-years (231 parsecs) away from the Sun in the constellation Lyra. The system has an apparent magnitude of 10. The brightest and most massive star of this system is WASP-3A, an F-type main sequence star which has one known transiting hot Jupiter exoplanet, WASP-3b. Since the planet transits the star, the star is classified as a planetary transit variable and has received the variable star designation V838 Lyrae.[1]

Triple system

WASP-3 has been identified as a triple star system in a 2019 study of astrometry from the Gaia mission.[2]: 5093  The brightest and most massive component of the system is WASP-3A, an F-type main sequence star that is 1.24 times as massive as the Sun and 1.31 times as large as the Sun in radius.[3]: 1581  WASP-3A appears to be a variable star; observations between 2007 and 2010 show that the star's chromospheric activity had increased during that time period.[4] The second companion, WASP-3B, is a low-mass star about 0.11 times as massive as the Sun and has an effective temperature of about 2900 K.[5]: 11, 13  WASP-3B is separated eastward from WASP-3A at an angular separation of approximately 1.19 arcseconds, corresponding to a projected separation distance of about 300 astronomical unit|AU.[5]: 11, 13  WASP-3B was first identified in observations from 2012 to 2013.[5]: 14  The third companion, WASP-3C, is much more distant with an angular separation of approximately 18.3 arcseconds from WASP-3A, corresponding to a projected separation distance of 4230 AU.[2]: 5093  WASP-3C is about 0.77 times as massive as the Sun and has an effective temperature of about 4700 K.[6]

Planetary system

WASP-3A has one known transiting hot Jupiter extrasolar planet, WASP-3b, which was detected by the SuperWASP project in 2007.[3] It was confirmed in 2008 by observations from the William Herschel Telescope.

In 2010, researchers proposed a second planet orbiting WASP-3A due to transit timing variations in WASP-3b.[7][8] But in 2012 this proposal was refuted.[4]

The WASP-3 planetary system[9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.89±0.12 MJ 0.03182+0.00080
−0.00085 		1.8468351(4) <0.0058 83.72±0.39° 1.416±0.047 RJ

See also

References

  1. ↑ "V838 Lyr". General Catalog of Variable Stars - VizieR. https://vizier.cds.unistra.fr/viz-bin/VizieR-S?V*%20V838%20Lyr. 
  2. ↑ 2.0 2.1 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. 
  3. ↑ 3.0 3.1 Pollacco, D. et al. (2008). "WASP-3b: a strongly irradiated transiting gas-giant planet". Monthly Notices of the Royal Astronomical Society 385 (3): 1576–1584. doi:10.1111/j.1365-2966.2008.12939.x. Bibcode: 2008MNRAS.385.1576P. 
  4. ↑ 4.0 4.1 M Montalto; Gregorio, J.; Boue, G.; Mortier, A.; Boisse, I.; Oshagh, M.; Maturi, M.; Figueira, P. et al. (Nov 2, 2012). "A new analysis of the WASP-3 system: no evidence for an additional companion". MNRAS 427 (4): 2757. doi:10.1111/j.1365-2966.2012.21926.x. Bibcode: 2012MNRAS.427.2757M. 
  5. ↑ 5.0 5.1 5.2 Ngo, HenryExpression error: Unrecognized word "etal". (February 2015). "Friends of Hot Jupiters. II. No Correspondence between Hot-jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions". The Astrophysical Journal 800 (2): 22. doi:10.1088/0004-637X/800/2/138. 138. Bibcode: 2015ApJ...800..138N. 
  6. ↑ Michel, Kai-Uwe; Mugrauer, Markus (January 2024). "Gaia search for (sub)stellar companions of exoplanet hosts (Supplementary file)". Monthly Notices of the Royal Astronomical Society 527 (2): 3183–3195. doi:10.1093/mnras/stad3196. Bibcode: 2024MNRAS.527.3183M. 
  7. ↑ Planet found tugging on transits , Astronomy Now, 9 July 2010
  8. ↑ G.Maciejewski; D.Dimitrov; R.Neuhaeuser; A.Niedzielski; St.Raetz; Ch.Ginski; Ch.Adam, C.Marka; M.Moualla et al. (2010). "Transit timing variation in exoplanet WASP-3b". Monthly Notices of the Royal Astronomical Society 407 (4): 2625–2631. doi:10.1111/j.1365-2966.2010.17099.x. Bibcode: 2010MNRAS.407.2625M. 
  9. ↑ Bonomo, A. S. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. 

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Coordinates: Sky map 18h 34m 31.6249s, +35° 39′ 41.546″



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