WASP-26

WASP-26
Observation data; Epoch J2000 Equinox
Constellation	Cetus
Right ascension	00h 18m 24.7008s
Declination	−15° 16′ 02.2775″
Apparent magnitude (V)	11.30
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 km/s
Proper motion (μ)	RA: 27.393±0.154 mas/yr ; Dec.: -24.407±0.070 mas/yr
Parallax (π)	3.9292 ± 0.0726[1] mas
Distance	830 ± 20 ly ; (255 ± 5 pc)
Details[2][3][4][5]
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
Database references
SIMBAD	data

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

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.[2] 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.[6]

Planetary system

The "Hot Jupiter" class planet WASP-26b was discovered around WASP-26 in 2010.[2] 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.[7] A 2011 study using the Rossiter-McLaughlin effect failed to determine the inclination of the planetary orbit to the rotational axis of the parent star due to high stellar noise.[4]

The WASP-26 planetary system[2][5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	1.02±0.03 M_J	0.0400±0.0003	2.75660±0.00001	0	82.5±0.5°	1.216±0.047 R_J

References

WASP-26 -- Star
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.
A. Bonfanti, S. Ortolani, and V. Nascimbeni, "Age consistency between exoplanet hosts and field stars", 2016
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.
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.
Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013
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.

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[Simbad-1] WASP-26 -- Star

[Smalley2010-2] 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.

[3] A. Bonfanti, S. Ortolani, and V. Nascimbeni, "Age consistency between exoplanet hosts and field stars", 2016

[Anderson2018-4] 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.

[Southworth2014-5] 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.

[6] Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013

[7] 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.