Kepler-296

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Double star
Kepler-296
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation lyre
Right ascension 19 h 06 m 09.602 s
declination + 49 ° 26 ′ 14.37 ″
Known exoplanets

5

Astrometry
distance  226  +28−18 pc
Individual data
Names A; B.
Typing:
Spectral class A. M2 V
Physical Properties:
Dimensions A. 0.626 ± 0.012 M ☉
B. 0.453 ± 0.014 M ☉
radius A. 0.595 ± 0.011 R ☉
B. 0.429 ± 0.012 R ☉
Effective temperature A. 3821 ± 40 K
B. 3434 ± 19 K
Age 4.2  +3.4−1.6 Billions
Other names
and catalog entries
Further designations: Kepler-296 • WISE J190609.59 + 492614.2 • KIC 11497958 • KOI-1422

Template: Infobox double star / maintenance / RekDekSizeLeer

Kepler-296 is a binary star system in the constellation Lyra , the approximately 737 light years from the sun away. With about 0.626 or 0.453 solar masses and about 0.595 or 0.429 solar radii, both stars are significantly smaller and not least also weaker than the sun. The Kepler space telescope, which was launched in 2009, was used to examine Kepler-296 for the presence of orbiting exoplanets using the transit method . A planetary system with proven five planets was discovered and announced on February 26, 2014 with more than 700 other planets found by the Kepler mission.

Further examinations by the Hubble Space Telescope revealed that Kepler-296 is a binary star system, with the two stars being approximately 80 AU apart. Since the Kepler telescope did not separate these two components and the measured light attenuation due to the planetary transits was related to the overall system, the planets can in principle be distributed arbitrarily over both stellar components. A further analysis of the data reveals, however, that the planets are all likely to orbit the larger component of the system, Kepler-296 A, which is a red dwarf of spectral class M2V.

Planetary system

Simulation of the planetary system of Kepler-296 A

All five verified planets of Kepler-296 A orbit their central star at a very short distance. Even the outermost planet, Kepler-296f, has a major semiaxis of only 0.283 AU , which is less than Mercury (around 0.387 AU) in the solar system . Since Kepler-296 A is a faint red dwarf, the two outer planets Kepler-296e and Kepler-296f are still in the habitable zone of the star, where liquid water could exist on their surface.

The Planetary Hability Laboratory of the University of Puerto Rico lists Kepler-296e with an Earth Similarity Index (ESI) of 0.85 in 2nd place behind Kepler-438b in their catalog of potentially habitable exoplanets ( Habitable Exoplanets Catalog ). Kepler-296e is listed in 29th place with an ESI of 0.60. Nearly twice the size of Earth, Kepler-296f could either be a gas planet with a dense hydrogen-helium atmosphere or an ocean planet with a deep ocean of water.

According to a 2014 study, the majority of the planets with more than 1.6 earth radii are probably not rocky planets , but rather small gas planets. Kepler-296f, like many exoplanets classified as "Earth-like" so far , could actually be less of a super-earth than a mini-Neptune .

Planetary system from Kepler-296 A
Planet
(by distance from the star) 		Discovery
(year) 		Radius
(in ) 		Cycle time
(in days) 		Major semi-axis
(in AU ) 		Orbit inclination
(in ) 		eccentricity
Kepler-296b 2014 0.94 ± 0.07 3.621457 ± 0.000040 0.039 - -
Kepler-296c 2014 2.15 ± 0.10 5.841648 ± 0.000015 0.054 - -
Kepler-296d 2014 2.28 ± 0.31 19.850242 ± 0.000097 0.122 - -
Kepler-296e 2014 1.48  +0.16−0.25 34.14204  +0.00025−0.00029 0.149  +0.035−0.024 89.89  +0.11−0.26 > 0.10  +0.14−0.10
Kepler-296f 2014 1.75  +0.12−0.19 63.33600 ± 0.00050 0.283  + 0.046−0.041 89.95  + 0.11−0.26 > 0.12  +0.10−0.09

Individual evidence

  1. ↑ SIMBAD: Kepler-296. Retrieved August 2, 2015 .
  2. ↑ a b c d e f g NASA Exoplanet Archive: Kepler-296. Retrieved July 5, 2015 .
  3. ↑ a b c d e Open Exoplanet Catalog: Kepler-296. Archived from the original on February 23, 2015 ; Retrieved April 8, 2015 .
  4. ^ A b NASA Ames Research Center: NASA's Kepler Mission Announces a Planet Bonanza, 715 New Worlds. Retrieved April 8, 2015 .
  5. ↑ Kimberly MS Cartier, Ronald L. Gilliland, Jason T. Wright, David R. Ciardi: Revision of Earth-sized Kepler Planet Candidate Properties with High Resolution Imaging by Hubble Space Telescope . arxiv : 1407.1057 .
  6. ^ A b Thomas Barclay, Elisa V. Quintana, Fred C. Adams, David R. Ciardi, Daniel Huber, Daniel Foreman-Mackey, Benjamin T. Montet, Douglas Caldwell: The Five Planets in the Kepler-296 Binary System All Orbit the Primary: A Statistical and Analytical Analysis . May 7, 2015, arxiv : 1505.01845 .
  7. ↑ National Astronautics and Space Administration: 715 Newly Verified Planets More Than Triples the Number of Confirmed Kepler Planets. Retrieved April 8, 2015 .
  8. ^ A b Planetary Hability Laboratory, University of Puerto Rico at Arecibo: The Habitable Exoplanets Catalog. Retrieved August 2, 2015 .
  9. ^ Leslie A. Rogers: Most 1.6 Earth-Radius Planets are not Rocky . arxiv : 1407.4457 .
  10. ↑ Paul Gilster: A Review of the Best Habitable Planet Candidates. Retrieved April 8, 2015 .