HAT-P-26

HAT-P-26 is a K-type main-sequence star about 302 light-years away. Survey in 2015 did not find any stellar companions on orbit around it.[4]

HAT-P-26
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension  14h 12m 37.5330s[1]
Declination +04° 03′ 36.1177″[1]
Apparent magnitude (V) 11.76[1]
Characteristics
Spectral type K1V
Astrometry
Parallax (π)10.7960 ± 0.0561[1] mas
Distance302 ± 2 ly
(92.6 ± 0.5 pc)
Details[2]
Mass0.81 M☉
Radius0.78 R☉
Temperature5079±88 K
Metallicity-0.04±0.08[3]
Rotational velocity (v sin i)1.8 km/s
Other designations
Gaia DR2 3668036348641580288, TYC 320-1027-1, GSC 0320-01027, 2MASS J14123753+0403359[1]
Database references
SIMBADdata

Planetary system

In 2010 a transiting hot Neptune like planet was detected.[3] The transiting planet HAT-P-26b was detected by the HATNet Project using telescopes located in Hawaii and Arizona. The planet is likely formed by pebble accretion mechanism.[5] The transmission spectrum of the HAT-P-26b was taken in the 2015, with best fit favouring either cloudless atmosphere or atmosphere with low-lying cloud deck.[6] The atmospheric composition of the planet was measured in 2019, and the water vapor volume fraction of 1.5+2.1
−0.9% was detected. The HAT-P-26 is carbon depleted, C/O ratio been constrained to less than 0.33. Also, atmosphere contains light metal hydrides.[7]. The measured planetary temperature is equal to 563+58
−54 K.

In 2019, the transit timing variation analysis of HAT-P-26b, has indicated a presence of the second planet in the system on the wide, 1141-days orbit.[8]

The HAT-P-26 planetary system[9][8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >0.0585±0.00717 MJ 0.0479±0.0006 4.234516±0.000015 0.124±0.060 88.6±0.9° 0.5647±0.0517 RJ
c (unconfirmed) — — 1141 — — —

References
  1. HAT-P-26 -- High proper-motion Star
  2. D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", A&A 529, A136 (2011)
  3. HAT-P-26b: A LOW-DENSITY NEPTUNE-MASS PLANET TRANSITING A K STAR, 2010, arXiv:1010.1008
  4. A Lucky Imaging search for stellar companions to transiting planet host stars, 2015, arXiv:1507.01938
  5. Mohamad Ali-Dib, Gunjan Lakhlani, "Possible formation pathways for the low-density Neptune-mass planet HAT-P-26b"
  6. A SEARCH FOR WATER IN THE ATMOSPHERE OF HAT-P-26b USING LDSS-3C, 2015, arXiv:1511.08226
  7. The Metal-Rich Atmosphere of the Neptune HAT-P-26b, 2019, arXiv:1903.09151
  8. Indications for transit timing variations in the exo-Neptune HAT-P-26b, 2019, arXiv:1904.06360
  9. Planet HAT-P-26 b on exoplanet.eu


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