WASP-3

Last updated
WASP-3
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Lyra
WASP-3A
Right ascension 18h 34m 31.6252s [1]
Declination +35° 39′ 41.492″ [1]
Apparent magnitude  (V)10.63±0.05 [2]
WASP-3C
Right ascension 18h 34m 30.2553s [3] [4]
Declination +35° 39′ 34.004″ [3] [4]
Characteristics
WASP-3A
Evolutionary stage main-sequence star
Spectral type F7V [2]
Apparent magnitude  (B)11.07±0.06 [2]
Apparent magnitude  (G)10.4541±0.0028 [2] [4]
Apparent magnitude  (J)9.603±0.020 [2]
Apparent magnitude  (H)9.407±0.014 [2]
Apparent magnitude  (K)9.361±0.015 [2]
Variable type planetary transit [5]
WASP-3B
Apparent magnitude  (J)16.88±0.12 [6]
Apparent magnitude  (H)16.090±0.079 [6]
Apparent magnitude  (K)16.002±0.052 [6]
Astrometry
WASP-3A
Radial velocity (Rv)−5.490±0.007 [7] km/s
Proper motion (μ)RA: −5.791(12) mas/yr [1]
Dec.: −21.929(15) mas/yr [1]
Parallax (π)4.3338±0.0120  mas [1]
Distance 753 ± 2  ly
(230.7 ± 0.6  pc)
Details
WASP-3A
Mass 1.24+0.06
−0.11 [7] : 1581   M☉
Radius 1.366±0.044 [8]   R☉
Surface gravity (log g)4.30+0.07
−0.03 [7] : 1581   cgs
Temperature 6400±100 [7] : 1581   K
Metallicity 0.00±0.20 [7] : 1581 
Rotational velocity (v sin i)13.4±1.5 [8]  km/s
Age 2.1±1.2 [8]   Gyr
WASP-3B
Mass 0.108±0.006 [6] : 14   M☉
Surface gravity (log g)~5.22 [6] : 13   cgs
Temperature ~2900 [6] : 13   K
Position (relative to WASP-3A) [6] : 11, 14 
ComponentWASP-3B
Epoch of observation 2012–2013
Angular distance ~1.19″
Position angle ~87.1°
Projected separation 300±20 AU
Position (relative to WASP-3A) [4]
ComponentWASP-3C
Angular distance 18.33192±0.00002 ″
Position angle 245.81872±0.00006°
Projected separation 4230 AU
Other designations
V838 Lyr, BD+35 3293, TOI-2131, TIC 27848472, WASP-3, TYC 2636-195-1, GSC 02636-00195, 2MASS J18343163+3539415, USNO-B1.0 1256-00285133, 1SWASP J183431.62+353941.4 [2]
Database references
SIMBAD data
Exoplanet Archive data

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. [5]

Contents

Triple system

WASP-3 has been identified as a triple star system in a 2019 study of astrometry from the Gaia mission. [9] : 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. [7] : 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. [10] 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. [6] : 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  AU . [6] : 11, 13  WASP-3B was first identified in observations from 2012 to 2013. [6] : 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. [9] : 5093  WASP-3C is about 0.77 times as massive as the Sun and has an effective temperature of about 4700 K. [4]

Planetary system

WASP-3A has one known transiting hot Jupiter extrasolar planet, WASP-3b, which was detected by the SuperWASP project in 2007. [7] 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. [11] [12] But in 2012 this proposal was refuted. [10]

The WASP-3 planetary system [8]
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)<0.005883.72±0.39 ° 1.416±0.047  RJ

See also

References

  1. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 5 6 7 8 "TYC 2636-195-1". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2009-05-04.
  3. 1 2 "UCAC4 629-058739". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 23 March 2025.
  4. 1 2 3 4 5 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. Bibcode:2024MNRAS.527.3183M. doi: 10.1093/mnras/stad3196 .
  5. 1 2 "V838 Lyr". General Catalog of Variable Stars - VizieR . Retrieved 3 April 2025.
  6. 1 2 3 4 5 6 7 8 9 10 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Crepp, Justin R.; Bechter, Eric B.; Batygin, Konstantin; et al. (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. arXiv: 1501.00013 . Bibcode:2015ApJ...800..138N. doi: 10.1088/0004-637X/800/2/138 . 138.
  7. 1 2 3 4 5 6 7 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. arXiv: 0711.0126 . Bibcode:2008MNRAS.385.1576P. doi: 10.1111/j.1365-2966.2008.12939.x . S2CID   2317308.
  8. 1 2 3 4 Bonomo, A. S.; Desidera, 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. arXiv: 1704.00373 . Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
  9. 1 2 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. Bibcode:2019MNRAS.490.5088M. doi: 10.1093/mnras/stz2673 .
  10. 1 2 M Montalto; Gregorio, J.; Boue, G.; Mortier, A.; Boisse, I.; Oshagh, M.; Maturi, M.; Figueira, P.; Sousa, S.; Santos, N. C. (Nov 2, 2012). "A new analysis of the WASP-3 system: no evidence for an additional companion". MNRAS. 427 (4): 2757. arXiv: 1211.0218 . Bibcode:2012MNRAS.427.2757M. doi: 10.1111/j.1365-2966.2012.21926.x . S2CID   59381004.
  11. ↑ Planet found tugging on transits Archived 2010-07-13 at the Wayback Machine , Astronomy Now, 9 July 2010
  12. ↑ G.Maciejewski; D.Dimitrov; R.Neuhaeuser; A.Niedzielski; St.Raetz; Ch.Ginski; Ch.Adam, C.Marka; M.Moualla; M.Mugrauer (2010). "Transit timing variation in exoplanet WASP-3b". Monthly Notices of the Royal Astronomical Society. 407 (4): 2625–2631. arXiv: 1006.1348 . Bibcode:2010MNRAS.407.2625M. doi: 10.1111/j.1365-2966.2010.17099.x . S2CID   120998224.
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