WASP-26

Last updated
WASP-26
Observation data
Epoch J2000       Equinox J2000
Constellation Cetus [1]
Right ascension 00h 18m 24.7008s [2]
Declination −15° 16′ 02.276″ [2]
Apparent magnitude  (V)11.30 [3]
Characteristics
Evolutionary stage subgiant [4] [2]
Spectral type G0 [5]
B−V color index 0.32[ citation needed ]
J−H color index 0.246[ citation needed ]
J−K color index 0.411[ citation needed ]
Astrometry
Radial velocity (Rv)9.07±0.41 [2] km/s
Proper motion (μ)RA: +27.416 [2] mas/yr
Dec.: −24.524 [2] mas/yr
Parallax (π)3.9574±0.0247  mas [2]
Distance 824 ± 5  ly
(253 ± 2  pc)
Details [6]
Mass 1.095±0.043  M☉
Radius 1.284±0.035  R☉
Luminosity 1.84 [2]   L☉
Surface gravity (log g)4.260±0.022  cgs
Temperature 6015±55  K
Metallicity [Fe/H]−0.02±0.09  dex
Rotational velocity (v sin i)3.9±0.4 [7]  km/s
Age 4.0+5.9
−4.0  Gyr
Other designations
TOI-2386, TIC 32487566, WASP-26, TYC 5839-876-1, 2MASS J00182469-1516022, DENIS J001824.6-151601 [8]
Database references
SIMBAD data
Exoplanet Archive data

WASP-26 is a G-type subgiant star about 824 light-years away in the constellation of Cetus.

Contents

Star characteristics

WASP-26 is an old star close to leaving the main sequence and is part of a wide binary. The binary's projected separation is 3800 astronomical units, its companion star being a K-type star with an effective temperature of 4600K and a visual magnitude of 13.6. [5] WASP-26 produces a large amount of ultraviolet light due to frequent flares, with an average ultraviolet flux close to the F7 class main-sequence star WASP-1. [9]

Planetary system

The hot Jupiter class planet WASP-26b was discovered around WASP-26 in 2010. [5] The planet would have an equilibrium temperature of 1660±40 K, but measured temperatures are slightly higher at 1775K and no noticeable difference exists between the day-side and the night-side of the planet. [10] A 2011 study using the Rossiter-McLaughlin effect failed to determine the inclination of the planetary orbit to the equatorial plane of the parent star due to high stellar noise, [7] but an initial constraint of -34+36
−26° was published in 2012. [11]

The WASP-26 planetary system [12]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b1.038+0.020
−0.021  MJ 		0.03997+0.00035
−0.00036		2.7565972(19)<0.003982.83±0.27 [6] ° 1.216±0.047 [6]   RJ

References

  1. ↑ 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.
  2. 1 2 3 4 5 6 7 8 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.
  3. ↑ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H.
  4. ↑ Irwin, Stacy Ann (2015). Analysis of Angular Momentum in Planetary Systems and Host Stars (Thesis). Bibcode:2015PhDT.........5I.
  5. 1 2 3 Smalley, B.; Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Lister, T. A.; Maxted, P. F. L.; Queloz, D.; Triaud, A. H. M. J.; West, R. G.; Bentley, S. J.; Enoch, B.; Pepe, F.; Pollacco, D. L.; Segransan, D.; Smith, A. M. S.; Southworth, J.; Udry, S.; Wheatley, P. J.; Wood, P. L.; Bento, J. (2010). "WASP-26b: A 1-Jupiter-mass planet around an early-G-type star". Astronomy and Astrophysics. 520: A56. arXiv: 1004.1542 . Bibcode:2010A&A...520A..56S. doi:10.1051/0004-6361/201014705. S2CID   55114421.
  6. 1 2 3 Southworth, John; Hinse, T. C.; Burgdorf, M.; Calchi Novati, S.; Dominik, M.; Galianni, P.; Gerner, T.; Giannini, E.; Gu, S.-H.; Hundertmark, M.; Jørgensen, U. G.; Juncher, D.; Kerins, E.; Mancini, L.; Rabus, M.; Ricci, D.; Schäfer, S.; Skottfelt, J.; Tregloan-Reed, J.; Wang, X.-B.; Wertz, O.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Browne, P.; Ciceri, S.; d'Ago, G.; Damerdji, Y.; et al. (2014). "High-precision photometry by telescope defocussing – VI. WASP-24, WASP-25 and WASP-26★". Monthly Notices of the Royal Astronomical Society. 444 (1): 776–789. arXiv: 1407.6253 . Bibcode:2014MNRAS.444..776S. doi: 10.1093/mnras/stu1492 . S2CID   53641330.
  7. 1 2 Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; Vanhuysse, M. (2011). "Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26". Astronomy & Astrophysics. 534: A16. arXiv: 1106.6092 . Bibcode:2011A&A...534A..16A. doi:10.1051/0004-6361/201117597. S2CID   31204371.
  8. ↑ "WASP-26". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2022-02-19.
  9. ↑ Shkolnik, Evgenya L. (2013). "An Ultraviolet Investigation of Activity on Exoplanet Host Stars". The Astrophysical Journal. 766 (1): 9. arXiv: 1301.6192 . Bibcode:2013ApJ...766....9S. doi:10.1088/0004-637X/766/1/9.
  10. ↑ Mahtani, D. P.; Maxted, P. F. L.; Anderson, D. R.; Smith, A. M. S.; Smalley, B.; Tregloan-Reed, J.; Southworth, J.; Madhusudhan, N.; Collier Cameron, A.; Gillon, M.; Harrington, J.; Hellier, C.; Pollacco, D.; Queloz, D.; Triaud, A. H. M. J.; West, R. G. (2013). "Warm Spitzer occultation photometry of WASP-26b at 3.6 and 4.5 μm". Monthly Notices of the Royal Astronomical Society. 432 (1): 693–701. arXiv: 1303.4596 . Bibcode:2013MNRAS.432..693M. doi: 10.1093/mnras/stt505 . S2CID   55842630.
  11. ↑ Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments", The Astrophysical Journal, 757 (1): 18, arXiv: 1206.6105 , Bibcode:2012ApJ...757...18A, doi:10.1088/0004-637X/757/1/18, S2CID   17174530
  12. ↑ 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. S2CID   118923163.
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