Kepler-65

Last updated
Kepler-65
Observation data
Epoch J2000       Equinox J2000
Constellation Lyra [1]
Right ascension 19h 14m 45.2916s [2]
Declination +41° 09 04.210 [2]
Apparent magnitude  (V)11.018
Characteristics
Evolutionary stage Subgiant
Spectral type F6IV
Astrometry
Proper motion (μ)RA: 1.256(14) mas/yr [2]
Dec.: −14.388(12) mas/yr [2]
Parallax (π)3.3184±0.0108  mas [2]
Distance 983 ± 3  ly
(301.4 ± 1.0  pc)
Details
Mass 1.25  M
Radius 1.41  R
Temperature 6211  K
Metallicity [Fe/H]+0.17  dex
Rotation 7.911±0.155 days [3]
Other designations
KOI-85, KIC 5866724, TYC 3125-976-1, GSC 03125-00976, 2MASS J19144528+4109042 [4]
Database references
SIMBAD data
KIC data

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

Contents

Planetary system

Three transiting planets were announced in 2013. A fourth non-transiting planet was discovered using radial velocity measurements in 2019. [5] 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. [6] Follow-up transit-timing variation analysis helped to measure the mass of Kepler-65d which revealed that it has significantly lower density than Earth. [7]

Size comparison of the three planets of Kepler 65 with a known radius (artistic concept) with Earth Kepler-65b.jpg
Size comparison of the three planets of Kepler 65 with a known radius (artistic concept) with Earth
The Kepler-65 planetary system [5]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b2.4+2.4
−1.6
  M🜨
0.0352.1549209+0.0000086
−0.0000074
0.028+0.031
−0.02
92.2+1.3
−1.4
°
1.444+0.037
−0.031
  R🜨
c5.4±1.7  M🜨 0.0685.859697+0.000093
−0.000099
0.02+0.022
−0.013
92.33+0.29
−0.26
°
2.623+0.066
−0.056
  R🜨
d4.14+0.79
−0.80
  M🜨
0.0848.13167+0.00024
−0.00021
0.014+0.016
−0.010
92.35+0.18
−0.16
°
1.587+0.040
−0.035
  R🜨
e200+200
−50
  M🜨
258.8+1.5
−1.3
0.283+0.064
−0.071
127.0+27.0
−25.0
°

References

  1. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 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. arXiv: 1308.1845 . Bibcode: 2013ApJ...775L..11M . doi: 10.1088/2041-8205/775/1/L11 .
  4. "Kepler-65". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 10 January 2017.
  5. 1 2 Mills, Sean M.; et al. (2019). "Long-period Giant Companions to Three Compact, Multiplanet Systems". The Astronomical Journal. 157 (4). 145. arXiv: 1903.07186 . Bibcode:2019AJ....157..145M. doi: 10.3847/1538-3881/ab0899 . S2CID   119197547.
  6. 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. arXiv: 1302.3728 . Bibcode: 2013ApJ...766..101C . doi: 10.1088/0004-637X/766/2/101 .
  7. Hadden, Sam; Lithwick, Yoram (2014). "Densities and Eccentricities of 139 Kepler Planets from Transit Time Variations". The Astrophysical Journal. 787 (1). 80. arXiv: 1310.7942 . Bibcode: 2014ApJ...787...80H . doi: 10.1088/0004-637X/787/1/80 .