Jump to content

WASP-8

Coordinates: Sky map 23h 59m 36.07s, −35° 01′ 52.9″
From Wikipedia, the free encyclopedia
This is an old revision of this page, as edited by Citation bot (talk | contribs) at 20:10, 26 June 2021 (Alter: title. Add: page, issue, s2cid, pages, volume, journal, doi, authors 1-13. | Use this bot. Report bugs. | Suggested by Abductive | Category:Durchmusterung objects | #UCB_Category 2238/3725). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
WASP-8
Observation data
Epoch J2000      Equinox J2000
Constellation Sculptor
Right ascension 23h 59m 36.0711s[1]
Declination −35° 01′ 52.920″[1]
Apparent magnitude (V) 9.9
Characteristics
WASP-8A
Evolutionary stage main-sequence
Spectral type G6
WASP-8B
Spectral type M[2]
Astrometry
Radial velocity (Rv)-1.9±0.6[3] km/s
Proper motion (μ) RA: 109.752[3] mas/yr
Dec.: 7.615[3] mas/yr
Parallax (π)11.1052±0.0175 mas[3]
Distance293.7 ± 0.5 ly
(90.0 ± 0.1 pc)
Position (relative to WASP-8A)[2]
ComponentWASP-8B
Epoch of observation2016
Angular distance4.520±0.005″
Position angle170.9±0.1°
Projected separation408 AU
Details[4]
WASP-8A
Mass1.093±0.024 M☉
Radius0.976±0.020 R☉
Luminosity0.79 L☉
Temperature5600±80 K
Metallicity [Fe/H]0.29±0.03 dex
Rotational velocity (v sin i)1.90±0.05[5] km/s
Age0.3+0.9
−0[4] Gyr
WASP-8B
Mass0.53±0.02 M☉
Temperature3758+47
−43 K
Other designations
TYC 7522-505-1, WDS J23596-3502A, 2MASS J23593607-3501530, Gaia DR2 2312679845530628096, CD-35 16019[6]
WASP-8A: Gaia EDR3 2312679845530628096
WASP-8B: Gaia EDR3 2312679845529776128
Database references
SIMBADdata

WASP-8 is a binary star system of 9.9 magnitude. The star system is much younger than Sun at 0.3+0.9
−0 billion years age, and is heavily enriched in heavy elements, having nearly twice the concentration of iron compared to the Sun.[4]

The primary, WASP-8A, is a magnitude 9.9 main-sequence yellow dwarf star. It is reported to be a G-type star of temperature 5600 K, mass of 1.093±0.024 solar masses, radius of 0.976±0.020 solar radius, and a luminosity of 0.79 of solar luminosity. There is a companion star WASP-8B located 4.5 arcseconds away with the same proper motion indicating a stellar binary system.[7] The binarity was confirmed in 2020.[2] The axis orientation of the primary star is uncertain, but it is close to pointing one of the poles to the Earth.[8]

Planetary system

The primary star is orbited by two known extrasolar planets, designated WASP-8b and WASP-8c. Planet WASP-8b was catalogued as part of the SuperWASP mission and discovered in 2010 by the astronomical transit method.[7] WASP-8c was discovered in late 2013 by radial velocity method.[9]


The WASP-8 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.216±0.035 MJ 0.0817±0.0006 8.159 0.3082 88.52° 1.165±0.032 RJ
c ≥9.45 MJ 5.28 4323 — — —

See also

Artist's impression of a star like WASP-8.

References

  1. ^ a b Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
  2. ^ a b c Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars", Astronomy & Astrophysics, 635: A73, arXiv:2001.08224, doi:10.1051/0004-6361/201937127, S2CID 210861118
  3. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ^ a b c d Southworth, J.; Bohn, A. J.; Kenworthy, M. A.; Ginski, C.; Mancini, L. (2020), "A multiplicity study of transiting exoplanet host stars", Astronomy & Astrophysics, 635: A74, arXiv:2001.08225, doi:10.1051/0004-6361/201937334, S2CID 210860775
  5. ^ Bourrier, V.; et al. (2017). "Refined architecture of the WASP-8 system: A cautionary tale for traditional Rossiter-McLaughlin analysis". Astronomy and Astrophysics. 599. A33. arXiv:1611.07985. Bibcode:2017A&A...599A..33B. doi:10.1051/0004-6361/201629973. S2CID 118864447.
  6. ^ "NAME WASP-8 A -- Star in double system". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-29.
  7. ^ a b Queloz, D.; et al. (2010). "WASP-8b: a retrograde transiting planet in a multiple system". Astronomy and Astrophysics. 517. L1. arXiv:1006.5089. Bibcode:2010A&A...517L...1Q. doi:10.1051/0004-6361/201014768. S2CID 35774603.
  8. ^ Bourrier, V.; Cegla, H. M.; Lovis, C.; Wyttenbach, A. (2016), "Refined architecture of the WASP-8 system: A cautionary tale for traditional Rossiter-Mc Laughlin analysis", Astronomy & Astrophysics, 599: A33, arXiv:1611.07985, doi:10.1051/0004-6361/201629973, S2CID 118864447
  9. ^ Knutson, Heather A.; Fulton, Benjamin J.; Montet, Benjamin T.; Kao, Melodie; Ngo, Henry; Howard, Andrew W.; Crepp, Justin R.; Hinkley, Sasha; Bakos, Gaspar Á.; Batygin, Konstantin; Johnson, John Asher; Morton, Timothy D.; Muirhead, Philip S. (2013), "Friends of Hot Jupiters. I. A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets", The Astrophysical Journal, 785 (2): 126, arXiv:1312.2954, doi:10.1088/0004-637X/785/2/126, S2CID 42687848


Stub icon

This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=WASP-8&oldid=1030575948"