Kepler-71

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Kepler-71
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus [1]
Right ascension 19h 37m 57.7155s[ citation needed ]
Declination 46° 17′ 08.943″[ citation needed ]
Apparent magnitude  (V)15.06[ citation needed ]
Characteristics
Evolutionary stage main sequence star[ citation needed ]
Spectral type G8V
V−R color index -0.29
R−I color index 0.46
J−H color index 0.377
J−K color index 0.457
Variable type ROT [2]
Astrometry
Radial velocity (Rv)0±7[ citation needed ] km/s
Proper motion (μ)RA: -2.343±0.039[ citation needed ] mas/yr
Dec.: -1.073±0.041[ citation needed ] mas/yr
Parallax (π)1.0647±0.0204  mas [ citation needed ]
Distance 3,060 ± 60  ly
(940 ± 20  pc)
Details [3] [4] [5]
Mass 0.923  M☉
Radius 0.816  R☉
Surface gravity (log g)4.54±0.01  cgs
Temperature 5545  K
Metallicity [Fe/H]0.22  dex
Rotation period 20 days
Age 2.5-4  Gyr
Other designations
KOI-217, BOKS 40959, KIC 9595827, 2MASS J19392772+4617090, Gaia DR2 2080095679848047872 [6]
Database references
SIMBAD data

Kepler-71 is a yellow main sequence star in the constellation of Cygnus.

Contents

Star characteristics

Kepler-71 is enriched by heavy elements at 170% of Sun metallicity, young and has a very prominent starspot activity. Starspots are covering about 40% of star surface at transit latitudes, each planetary transit passing over an average six starspots. [3] The bright facula regions are even more extensive. [7] Unlike Sun, the photosphere of Kepler-71 rotates nearly like rigid body, with differential rotation not exceeding 2%. [5]

Planetary system

The "Hot Jupiter" class planet Kepler-71b was discovered around Kepler-71 in 2010. [4]

The Kepler-71 planetary system [3] [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b —0.05029+0.00002
−0.00006		3.905079476+0.000008
−0.000009		089.8+0.2
−0.4 ° 		1.1987±0.0044  RJ

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. ↑ Sebastián Otero; Christopher Watson; Patrick Wils. "VARIABLE STAR TYPE DESIGNATIONS IN VSX". Variable Star Index. Retrieved 2020-05-23.]
  3. 1 2 3 Gusmão, Eber A.; Selhorst, Caius L.; Oliveira, Alexandre S. (2016). "Analysis of Kepler-71 Activity Through Planetary Transit". Proceedings of the International Astronomical Union. 12: 140–142. arXiv: 1703.00883 . doi:10.1017/S1743921317004057. S2CID   119106951.
  4. 1 2 Howell, Steve B.; Rowe, Jason F.; Sherry, William; von Braun, Kaspar; Ciardi, David R.; Bryson, Stephen T.; Feldmeier, John J.; Horch, Elliott; Van Belle, Gerard T. (2010). "Keplerobservations of Three Pre-Launch Exoplanet Candidates: Discovery of Two Eclipsing Binaries and a New Exoplanet". The Astrophysical Journal. 725 (2): 1633–1643. arXiv: 1010.4106 . Bibcode:2010ApJ...725.1633H. doi:10.1088/0004-637X/725/2/1633. S2CID   37374489.
  5. 1 2 3 Zaleski, S. M.; Valio, A.; Marsden, S. C.; Carter, B. D. (2019). "Differential rotation of Kepler-71 via transit photometry mapping of faculae and starspots" (PDF). Monthly Notices of the Royal Astronomical Society. 484 (1): 618–630. Bibcode:2019MNRAS.484..618Z. doi: 10.1093/mnras/sty3474 . Archived from the original (PDF) on 2020-05-08. Retrieved 2020-09-02.
  6. ↑ KOI-217 -- Rotationally variable Star
  7. ↑ Schrijver, Carolus J. (2020). "Testing the Solar Activity Paradigm in the Context of Exoplanet Transits". The Astrophysical Journal. 890 (2): 121. arXiv: 2001.01093 . Bibcode:2020ApJ...890..121S. doi: 10.3847/1538-4357/ab67c1 . S2CID   209862471.


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