Kepler-47

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Double star
Kepler-47
An artist's rendering of the planetary system
An artist's rendering of the planetary system
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation swan
Right ascension 19 h 41 m 11.498 s
declination + 46 ° 55 ′ 13.705 ″
Known exoplanets

3

Astrometry
parallax (0.95 ± 0.03) mas
distance  (3430 ± 100) ly
(1060 ± 30 pc )
Proper movement :
Rec. Share: (−3.49 ± 0.06) mas / a
Dec. portion: (−10.07 ± 0.06) mas / a
orbit 
period 7.44837695 ± 0.00000021 d
Major semi-axis 0.0836 ± 0.0014 AU
eccentricity 0.0234 ± 0.0010
Orbit inclination 89.34 ° ± 0.12 °
Argument of the periapsis 212.3 ° ± 4.4 °
Individual data
Names A; B.
Physical Properties:
Dimensions A. 1.04 ± 0.06 M ☉
B. 0.36 ± 0.01 M ☉
radius A. 0.96 ± 0.02 R ☉
B. 0.35 ± 0.01 R ☉
Luminosity A. 0.840 ± 0.067 L ☉
B. 0.014 ± 0.002 L ☉
Effective temperature A. 5640 ± 100 K
B. 3360 ± 100K
Other names
and catalog entries
Further designations: KIC 10020423, KOI-3154, 2MASS J19411149 + 4655136

Template: Infobox double star / maintenance / RekDekSizeLeer

Kepler-47 is a binary star system that is orbited by three exoplanets in a circular fashion . It was the second system discovered after Kepler-16 in which a binary star is orbited by planets, and the first known system of this type with more than one planet. Such systems are usually considered to be very unstable because of the complex orbit dynamics. The common orbital plane of the planets is remarkable. The planets "b and c" were discovered in 2012 by the Kepler space telescope using the transit method . Planet "d" was also obtained from data from the Kepler telescope, but could not be confirmed until 2019. Kepler-47 is around 3500 light years away and is located in the constellation Swan .

Stars

The stars orbit each other in 7.45 days. The larger of the two stars is similar in size to the Sun, but only 84% of its luminosity , while the smaller is a red dwarf with only a third the size of the Sun and 1% the luminosity of the Sun.

Planetary system

Illustration of the orbits around Kepler-47

Kepler-47b , the innermost planet, orbits both stars in 49.5 days and has a radius of about three Earth radii. Its mass is unknown and therefore no conclusions can be drawn about its possible composition.

Kepler-47c , the outermost planet, is in the habitable zone . Its orbital period is 303.2 days. With a radius of almost 5 earth radii, it is slightly larger than Uranus . Its mass is not known; presumably it is roughly in the range of a Neptune mass.

Kepler-47d orbits both stars in 187.4 days and has a radius of 7 Earth radii. It is located between Kepler-47b and Kepler-47c.

Kepler 47 planet
Planet
(order
from the star) 		Discovered Mass
( M J ) 		Radius
( R J ) 		Major semiaxis of
the orbit
( AE ) 		Rotation time
( days ) 		eccentricity Orbit inclination
( degree )
Kepler-47b 2012 - 0.27 ± 0.01 0.296 ± 0.005 49.51 ± 0.04 - 89.6 ± 0.5
Kepler-47d 2013 0.06   +0.07−0.04 0.63   +0.06−0.04 0.699 ± 0.003 187.35 ± 0.15 0.024   +0.025−0.017 90.0
Kepler-47c 2012 - 0.41 ± 0.02 0.989 ± 0.016 303.15 ± 0.07 - 89.8

literature

Web links

Commons : Kepler-47  - collection of pictures, videos and audio files

Individual evidence

  1. ↑ a b Kepler-47. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 22, 2019 .
  2. ↑ a b c d e Jerome A. Orosz, William F. Welsh, Joshua A. Carter, Daniel C. Fabrycky, William D. Cochran, Michael Endl, Eric B. Ford, Nader Haghighipour, Phillip J. MacQueen, Tsevi Mazeh, Roberto Sanchis-Ojeda, Donald R. Short, Guillermo Torres, Eric Agol, Lars A. Buchhave, Laurance R. Doyle, Howard Isaacson, Jack J. Lissauer, Geoffrey W. Marcy, Avi Shporer, Gur Windmiller, Thomas Barclay, Alan P. Boss, Bruce D. Clarke, Jonathan Fortney, John C. Geary, Matthew J. Holman, Daniel Huber, Jon M. Jenkins, Karen Kinemuchi: Kepler-47: A Transiting Circumbinary Multi-Planet System . In: Science . 337, No. 6101, pp. 1511-4. arxiv : 1208.5489 . bibcode : 2012Sci ... 337.1511O . doi : 10.1126 / science.1228380 . PMID 22933522 .
  3. ↑ Jerome A. Orosz, William F. Welsh, Nader Haghighipour, Billy Quarles, Donald R. Short, Sean M. Mills, Suman Sutyal, Guillermo Torres, Eric Agol, Daniel C. Fabrycky: Discovery of a Third Transiting Planet in the Kepler -47 Circumbinary System . In: The Astronomical Journal . 157, No. 5, April 16, 2019, p. 174. arxiv : 1904.07255 . doi : 10.3847 / 1538-3881 / ab0ca0 .
  4. ↑ Stefan Deiters: Two planets around two suns. In: astronews. Dr. Stefan Deiters, August 29, 2012, accessed on September 2, 2012 .
  5. ↑ Kepler-47 (AB) b. In: Extrasolar Planets Encyclopaedia . Retrieved April 22, 2019 .
  6. ↑ Kepler-47 (AB) d. In: Extrasolar Planets Encyclopaedia. Retrieved April 22, 2019 .
  7. ↑ Kepler-47 (AB) c. In: Extrasolar Planets Encyclopaedia. Retrieved April 22, 2019 .