WASP-2

WASP-2
Observationsdata
Epok: J2000.0
StjärnbildDelfinen
Rektascension20t 30m 54,1279s[1]
Deklination+06° 25′ 46,338″[1]
Skenbar magnitud ()+11,98[2]
Stjärntyp
SpektraltypK1.5 V + K2-M3[3]
VariabeltypPlanetpassage-variabel
Astrometri
Egenrörelse (µ)RA: +5,936 ± 0,101[1] mas/år
Dek.: -48,279 ± 0,082[1] mas/år
Parallax ()6,4980 ± 0,068[1]
Avstånd502 ± 5  (154 ± 2 pc)
Detaljer
Massa0,843 ± 0,033[4] M
Radie0,821 ± 0,013[4] R
Temperatur5 170 ± 60[4] K
Ålder7,6+2,5-3,3[4] miljarder år
Andra beteckningar
GSC 00522-01199, 2MASS J20305413+0625463, UCAC2 34018636, USNO-B1.0 0964-00543604, WDS J20309+0626A, Gaia EDR3 1748596020745038208, Gaia DR2 1748596020745038208 [5]

WASP-2 är en dubbelstjärna[2] i den södra delen av stjärnbilden Delfinen. Den har en skenbar magnitud av ca 11,98[1] och kräver ett teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 6,5 mas,[4] beräknas den befinna sig på ett avstånd på ca 500 ljusår (ca 154 parsek) från solen.

Egenskaper

Primärstjärnan WASP-2A är en orange till gul stjärna i huvudserien av spektralklass K1.5 V[3] Den har en massa som är ca 0,84[4] solmassor, en radie som är ca 0,82[4] solradier och har en effektiv temperatur av ca 5 200 K.[4]

Följeslagaren WASP-2C är en röd stjärna i huvudserien av spektralklass K2 - M3,[3] som kretsar i en vid omloppsbana[6][7] med en separation från primärstjärnan på ca 111 AE. Nya undersökningar av WASP-2-spektrumet 2015[8] har resulterat i mätning av följeslagarens temperatur till 3 513 ± 28 K och vinkelseparation på 0,73 bågsekund.[9] Konstellationen visar ett överskott av infraröd strålning av okänt ursprung.[10]

Planetsystem

WASP-2 har en exoplanet WASP-2b, upptäckt av SuperWASP-projektet 2006.[11]

WASP-2 solsystem[4]
Planet Massa Halv storaxel
(AE)
Siderisk omloppstid
(d)
Excentricitet Inklination Radie
b ≥ 0,882 ± 0,027 MJ 0,0308 ± 0,0004 2,15222144 ± 0,0000004 0± 0,096 - -

Se även

Anmärkning

Följeslagaren identifieras med ett "C"-suffix för att inte förväxlas med planetbeteckningssuffixet "b".

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, WASP-2, 27 augusti 2021.

Noter

  1. ^ [a b c d e f] 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. ^ [a b] "WASP-2". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2009-05-04.
  3. ^ [a b c] Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
  4. ^ [a b c d e f g h i] Southworth, J.; Bohn, A. J.; Kenworthy, M. A.; Ginski, C.; Mancini, L. (2020), "A multiplicity study of transiting exoplanet host stars. II.Revised properties of transiting planetary systems with companions", Astronomy & Astrophysics, A74: 635, arXiv:2001.08225, Bibcode:2020A&A...635A..74S, doi:10.1051/0004-6361/201937334, S2CID 210860775
  5. ^ WASP-2 (unistra.fr). Hämtad 2022-07-31.
  6. ^ Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020), "Orbital stability of circumstellar planets in binary systems", The Astronomical Journal, 159 (3): 80, arXiv:1912.11019, Bibcode:2020AJ....159...80Q, doi:10.3847/1538-3881/ab64fa, S2CID 209444271
  7. ^ Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B
  8. ^ Daemgen; et al. (2009). "Binarity of transit host stars - Implications for planetary parameters" (PDF). Astronomy and Astrophysics. 498 (2): 567–574. arXiv:0902.2179. Bibcode:2009A&A...498..567D. doi:10.1051/0004-6361/200810988. S2CID 9893376.
  9. ^ Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal, 814 (2): 148, arXiv:1510.08062, Bibcode:2015ApJ...814..148P, doi:10.1088/0004-637X/814/2/148, S2CID 11525988
  10. ^ Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn; Bays, Kevin; Lunsford, Allen; o'Gorman, Eamon (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific, 124 (913): 212–229, arXiv:1202.2799, Bibcode:2012PASP..124..212S, doi:10.1086/665043, S2CID 29665395
  11. ^ Cameron, A. Collier; et al. (2007). "WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE". Monthly Notices of the Royal Astronomical Society. 375 (3): 951–957. arXiv:astro-ph/0609688. Bibcode:2007MNRAS.375..951C. doi:10.1111/j.1365-2966.2006.11350.x. S2CID 735515.

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