Tuiren (star)

Tuiren,[2] also referred to as HAT-P-36, is a 12th magnitude G-type main-sequence star estimated to be approximately 1,034 light-years away from Earth in the constellation Canes Venatici. Tuiren is too faint to be seen with the naked eye, but it is possible to view it with binoculars or a small telescope. In 2012 a hot Jupiter-type exoplanet was discovered orbiting Tuiren with an orbital period of about 1.3 Earth days.[3] In December 2019, HAT-P-36 was named Tuiren and its planetary companion, HAT-P-36b, was named Bran as a result of Ireland's contribution to the 2019 NameExoWorlds campaign.[4] Bran has a mass approximately 1.8 times that of Jupiter and a radius 1.2 times larger.

Tuiren
Location of Tuiren (circled) within Canes Venatici
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canes Venatici
Right ascension 12h 33m 03s[1]
Declination +44° 54′ 55″
Apparent magnitude (V) 12.26
Characteristics
Spectral type G
Astrometry
Radial velocity (Rv)-16.434 km/s
Proper motion (μ) RA: -11.641 mas/yr
Dec.: 8.065 mas/yr
Parallax (π)3.3678 ± 0.0258 mas
Distance968 ± 7 ly
(297 ± 2 pc)
Details
Mass1.022 ± 0.049 M☉
Radius1.096 ± 0.056 R☉
Temperature5580 ± 100.0 K
Metallicity [Fe/H]0.26 ± 0.08 dex
Age6.6 ± 1.8 Gyr
Other designations
2MASS J12330390+4454552, Gaia DR1 1541532207133249920
Database references
SIMBADdata

Etymology
Tuiren (centre) as viewed in the Sloan Digital Sky Survey. The bright star to the top-left is TYC 3020-2195-1, an A-type main-sequence star approximately 3,156 light-years away.[5]

Tuiren and its planet are named after characters from The Birth of Bran, a story in the book Irish Fairy Tales by James Stephens. The book is a re-telling of various stories from Irish folklore. Tuiren was the aunt of the mythical hero Fionn mac Cumhaill and was turned into a hound by the fairy Uchtdealbh after Tuiren married her husband. Bran and Sceólan were the two puppies mothered by Tuiren while she was a dog. They were cousins of Fionn mac Cumhaill. The names were proposed by John Murphy, a teacher at Regina Mundi College, Cork.[6]

Planets
The Tuiren[1] planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
Bran ≥1.832±0.099 MJ 0.0238±0.0004 1.327347±0.000003 0.063±0.032 86±1.3° 1.264±0.071 RJ

Bran (HAT-P-36b) was discovered in 2012 by the HATNet Project using the transit method.[3]

Size comparison
Jupiter Bran

References
  1. "Planet HAT-P-36 b". Extrasolar Planets Encyclopaedia. Retrieved 24 July 2020.
  2. "IAU100 NameExoWorlds Approved Names" (PDF). NameExoWorlds. International Astronomical Union. Retrieved 24 July 2020.
  3. "HAT-P-36". Open Exoplanet Catalogue. Retrieved 24 July 2020.
  4. Smith, Niall (29 September 2019). "Sky Matters: Ireland has the chance to name a star and a planet - any ideas?". Irish Examiner. Retrieved 24 July 2020.
  5. "TYC 3020-2195-1". Centre de Données astronomiques de Strasbourg. SIMBAD. Retrieved 24 July 2020.
  6. Gorey, Colm (18 December 2019). "Cork teacher names exoplanet and star after Irish mythical dogs". Silicon Republic. Retrieved 24 July 2020.
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