WASP-3

WASP-3
	; A light curve for WASP-3, plotted from TESS data
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Lyra
	WASP-3A
Right ascension	18h 34m 31.6252s
Declination	+35° 39′ 41.492″
Apparent magnitude (V)	10.63±0.05
	WASP-3C
Right ascension	18h 34m 30.2553s
Declination	+35° 39′ 34.004″
Characteristics
WASP-3A
Evolutionary stage	main-sequence star
Spectral type	F7V
Apparent magnitude (B)	11.07±0.06
Apparent magnitude (G)	10.4541±0.0028
Apparent magnitude (J)	9.603±0.020
Apparent magnitude (H)	9.407±0.014
Apparent magnitude (K)	9.361±0.015
Variable type	planetary transit
WASP-3B
Apparent magnitude (J)	16.88±0.12
Apparent magnitude (H)	16.090±0.079
Apparent magnitude (K)	16.002±0.052
Astrometry
WASP-3A
Radial velocity (Rv)	−5.490±0.007 km/s
Proper motion (μ)	RA: −5.791(12) mas/yr ; Dec.: −21.929(15) mas/yr
Parallax (π)	4.3338±0.0120 mas
Distance	753 ± 2 ly ; (230.7 ± 0.6 pc)
Details
WASP-3A
Mass	1.24+0.06; −0.11 M☉
Radius	1.366±0.044 R☉
Surface gravity (log g)	4.30+0.07; −0.03 cgs
Temperature	6400±100 K
Metallicity	0.00±0.20
Rotational velocity (v sin i)	13.4±1.5 km/s
Age	2.1±1.2 Gyr
WASP-3B
Mass	0.108±0.006 M☉
Surface gravity (log g)	~5.22 cgs
Temperature	~2900 K
Position (relative to WASP-3A)
Component	WASP-3B
Epoch of observation	2012–2013
Angular distance	~1.19″
Position angle	~87.1°
Projected separation	300±20 AU
Position (relative to WASP-3A)
Component	WASP-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
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.^[7]

Triple system

WASP-3 has been identified as a triple star system in a 2019 study of astrometry from the Gaia mission.^[11]^: 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.^[9]^: 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.^[12] 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.^[8]^: 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.^[8]^: 11, 13 WASP-3B was first identified in observations from 2012 to 2013.^[8]^: 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.^[11]^: 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.^[9] 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.^[13]^[14] But in 2012 this proposal was refuted.^[12]

The WASP-3 planetary system^[10]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	1.89±0.12 $M$ _J	0.03182+0.00080 −0.00085	1.8468351(4)	<0.0058	83.72±0.39°	1.416±0.047 $R$ _J

References

^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 11 April 2025.
^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h "TYC 2636-195-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-05-04.
^ ^a ^b "UCAC4 629-058739". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 March 2025.
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b "V838 Lyr". General Catalog of Variable Stars - VizieR. Retrieved 3 April 2025.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b ^c ^d ^e ^f ^g 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ Planet found tugging on transits Archived 2010-07-13 at the Wayback Machine, Astronomy Now, 9 July 2010
^ 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.

External links

"WASP-3". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-05-04.

[MAST-1] "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 11 April 2025.

[Roman1987-2] Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.

[GaiaDR3-3] 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.

[SIMBAD-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h "TYC 2636-195-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-05-04.

[SIMBAD-WASP-3C-5] "UCAC4 629-058739". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 March 2025.

[Michel2024-6] 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. Bibcode:2024MNRAS.527.3183M. doi:10.1093/mnras/stad3196.

[GCVS-7] "V838 Lyr". General Catalog of Variable Stars - VizieR. Retrieved 3 April 2025.

[Ngo2015-8] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.

[Pollacco2008-9] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[Bonomo2017-10] 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.

[Mugrauer2019-11] 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.

[Montalto-12] 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.

[13] Planet found tugging on transits Archived 2010-07-13 at the Wayback Machine, Astronomy Now, 9 July 2010

[14] 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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Observation data Epoch J2000.0 Equinox J2000.0
A light curve for WASP-3, plotted from TESS data^[1]
Constellation	Lyra^[2]
WASP-3A
Right ascension	18^h 34^m 31.6252^s^[3]
Declination	+35° 39′ 41.492″^[3]
Apparent magnitude (V)	10.63±0.05^[4]
WASP-3C
Right ascension	18^h 34^m 30.2553^s^[5]^[6]
Declination	+35° 39′ 34.004″^[5]^[6]
Characteristics
WASP-3A
Evolutionary stage	main-sequence star
Spectral type	F7V^[4]
Apparent magnitude (B)	11.07±0.06^[4]
Apparent magnitude (G)	10.4541±0.0028^[4]^[6]
Apparent magnitude (J)	9.603±0.020^[4]
Apparent magnitude (H)	9.407±0.014^[4]
Apparent magnitude (K)	9.361±0.015^[4]
Variable type	planetary transit^[7]
WASP-3B
Apparent magnitude (J)	16.88±0.12^[8]
Apparent magnitude (H)	16.090±0.079^[8]
Apparent magnitude (K)	16.002±0.052^[8]
Astrometry
WASP-3A
Radial velocity (R_v)	−5.490±0.007^[9] km/s
Proper motion (μ)	RA: −5.791(12) mas/yr^[3] Dec.: −21.929(15) mas/yr^[3]
Parallax (π)	4.3338±0.0120 mas^[3]
Distance	753 ± 2 ly (230.7 ± 0.6 pc)

Details
WASP-3A
Mass	1.24+0.06 −0.11^[9]^: 1581 `M`_☉
Radius	1.366±0.044^[10] `R`_☉
Surface gravity (log g)	4.30+0.07 −0.03^[9]^: 1581 cgs
Temperature	6400±100^[9]^: 1581 K
Metallicity	0.00±0.20^[9]^: 1581
Rotational velocity (v sin i)	13.4±1.5^[10] km/s
Age	2.1±1.2^[10] Gyr
WASP-3B
Mass	0.108±0.006^[8]^: 14 `M`_☉
Surface gravity (log g)	~5.22^[8]^: 13 cgs
Temperature	~2900^[8]^: 13 K
Position (relative to WASP-3A)^[8]^: 11, 14

Component	WASP-3B
Epoch of observation	2012–2013
Angular distance	~1.19″
Position angle	~87.1°
Projected separation	300±20 AU
Position (relative to WASP-3A)^[6]

Component	WASP-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^[4]
Database references
SIMBAD	data
Exoplanet Archive	data

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