WASP-26

WASP-26 is a yellow main sequence star in the constellation of Cetus.

WASP-26

Observation data Epoch J2000      Equinox
Constellation	Cetus
Right ascension	00h 18m 24.7008s[1]
Declination	−15° 16′ 02.2775″[1]
Apparent magnitude (V)	11.30[2]
Characteristics
Evolutionary stage	main sequence star
Spectral type	G0V
B−V color index	0.32
J−H color index	0.246
J−K color index	0.411
Astrometry
Radial velocity (Rv)	9.60±0.54[1] km/s
Proper motion (μ)	RA: 27.416±0.022[1] mas/yr Dec.: -24.454±0.021[1] mas/yr
Parallax (π)	3.9574 ± 0.0247 mas[1]
Distance	824 ± 5 ly (253 ± 2 pc)
Details[3][4][5][6]
Mass	1.09±0.01 M☉
Radius	1.284±0.035 R☉
Luminosity	1.26 L☉
Surface gravity (log g)	4.40±0.01 cgs
Temperature	6015±55 K
Metallicity [Fe/H]	-0.02±0.09 dex
Rotational velocity (v sin i)	3.9±0.4 km/s
Age	6±2 Gyr
Other designations
WASP-26, TYC 5839-876-1, DENIS J001824.6-151601, 2MASS J00182469-1516022, Gaia DR2 2416782701664155008[7]
Database references
SIMBAD	data

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 red dwarf with an effective temperature of 4600K and a visual magnitude of 13.6.^[3] 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.^[8]

Planetary system

The "Hot Jupiter" class planet WASP-26b was discovered around WASP-26 in 2010.^[3] 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.^[9] 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,^[5] but an initial constraint of -34⁺³⁶
₋₂₆° was published in 2012.^[10]

The WASP-26 planetary system^[3][6]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	1.02±0.03 MJ	0.0400±0.0003	2.75660±0.00001	0	82.5±0.5°	1.216±0.047 RJ

References

1. 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. 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.
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.
4. A. Bonfanti, S. Ortolani, and V. Nascimbeni, "Age consistency between exoplanet hosts and field stars", 2016
5. 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.
6. 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. "WASP-26". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-19.
8. Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013
9. 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.
10. 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