Astronomy:Kepler-65

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Short description: F-type subgiant star in the constellation Lyra
Kepler-65
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lyra
Right ascension  19h 14m 45.2920s[1]
Declination +41° 09′ 04.207″[1]
Apparent magnitude (V) 11.018
Characteristics
Evolutionary stage Subgiant
Spectral type F6IV
Astrometry
Proper motion (μ) RA: 0.970±0.056[1] mas/yr
Dec.: −14.189±0.056[1] mas/yr
Parallax (π)3.2638 ± 0.0289[1] mas
Distance999 ± 9 ly
(306 ± 3 pc)
Details
Mass1.25 M
Radius1.41 R
Temperature6211 K
Metallicity [Fe/H]+0.17 dex
Rotation7.911±0.155 days[2]
Other designations
KOI-85, KIC 5866724, TYC 3125-976-1, GSC 03125-00976, 2MASS J19144528+4109042[3]
Database references
SIMBADdata
KICdata

Kepler-65 is a subgiant star slightly more massive than the Sun and has at least four planets.

Planetary system

Three transiting planets were announced in 2013. A fourth non-transiting planet was discovered using radial velocity measurements in 2019.[4] The first three planets orbit very close to their star. Initial follow-up radial velocity measurements provided data too noisy to constrain the mass of planets.[5] Follow-up transit-timing variation analysis helped to measure the mass of Kepler-65d which revealed that it has significantly lower density than Earth.[6]

The Kepler-65 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 2.4+2.4
−1.6
 M
0.035 2.1549209+0.0000086
−0.0000074
0.028+0.031
−0.02
92.2+1.3
−1.4
°
1.444+0.037
−0.031
 R
c 5.4±1.7 M 0.068 5.859697+0.000093
−0.000099
0.02+0.022
−0.013
92.33+0.29
−0.26
°
2.623+0.066
−0.056
 R
d 4.14+0.79
−0.80
 M
0.084 8.13167+0.00024
−0.00021
0.014+0.016
−0.010
92.35+0.18
−0.16
°
1.587+0.040
−0.035
 R
e 200+200
−50
 M
258.8+1.5
−1.3
0.283+0.064
−0.071
127.0+27.0
−25.0
°

External links

References

  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters 775 (1): L11. doi:10.1088/2041-8205/775/1/L11. Bibcode2013ApJ...775L..11M. 
  3. "Kepler-65". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-65. 
  4. 4.0 4.1 Mills, Sean M. et al. (2019). "Long-period Giant Companions to Three Compact, Multiplanet Systems". The Astronomical Journal 157 (4): 145. doi:10.3847/1538-3881/ab0899. Bibcode2019AJ....157..145M. 
  5. Chaplin, W. J. et al. (2013). "Asteroseismic Determination of Obliquities of the Exoplanet Systems Kepler-50 and Kepler-65". The Astrophysical Journal 766 (2): 101. doi:10.1088/0004-637X/766/2/101. Bibcode2013ApJ...766..101C. 
  6. Hadden, Sam; Lithwick, Yoram (2014). "Densities and Eccentricities of 139 Kepler Planets from Transit Time Variations". The Astrophysical Journal 787 (1): 80. doi:10.1088/0004-637X/787/1/80. Bibcode2014ApJ...787...80H.