Kepler-1625b

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Exoplanet
Kepler-1625b

Artist's impression of Kepler-1625b with his suspected moon

Artist's impression of Kepler-1625b with his suspected moon
Constellation swan
Position
equinox : J2000.0
Right ascension 19h 41m 43.040s
declination + 39 ° 53 ′ 11.499 ″
Orbit data
Central star Kepler-1625
Period of circulation 287.379 ± 0.003 d
Further data
radius 0.541   +0.078−0.047R ♃
distance 2400 pc
method Transit method
history
discovery T. Morton et al.
Date of discovery 2016
Catalog names
KOI-5084 b, KIC 4760478 b

Kepler-1625b is a exoplanet that the approximately 8,000 light-years from the sun distant star Kepler-1625 in the constellation Swan orbits. The Jupiter great about Planet possibly has a large neptune Exomond .

discovery

Kepler-1625b was discovered using the transit method through the Kepler Space Telescope . The discovery was announced in May 2016 by a team of astronomers led by Timothy Morton of Princeton University , along with that of 1,283 other exoplanets.

properties

The diameter of the planet is at least six times that of the earth. It may be roughly the size of the solar system planet Jupiter and ten times its mass. Kepler-1625b must therefore be a gas giant in any case . It takes about 287 days to orbit its central star, which is a sub-giant with about the mass of the Sun.

Suspected exomoon

According to a team of astronomers led by Alex Teachey from Columbia University, the unusual shape of the light curves in the three previously observed transits of Kepler-1625b makes it appear possible that the planet is orbited by a moon. According to the researchers, this extrasolar moon would have approximately the size of the planet Neptune in the solar system and would orbit Kepler-1625b at a distance that corresponds to its 19 times the planetary diameter. He would be far outside the Roche limit and still within the Hill sphere of the planet. The moon's orbit would be dynamically stable, even over long periods of more than 5 billion years. Because of the proportions of the planet and moon, the system would be more like a double planet system .

The suspected exomoon was given the name Kepler-1625b I by the research group around Alex Teachey , which is based on the numbering of the planetary moons in the solar system.

Simulations with the observational data of a second research group confirm the tendency of an exomoon - but other explanations are still possible.

In October 2017, the next planetary transit of Kepler-1625b was examined with the Hubble space telescope , the data analysis corroborated the evidence of the exomoon. Above all, the observed transit events can best be explained with an exomoon based on the available data. However, other explanations have been put forward for the observed fluctuations in brightness.

Should the existence of the moon be confirmed, it would be the first clearly proven extrasolar moon.

Individual evidence

  1. ↑ SIMBAD : KOI-5084.01. Retrieved October 8, 2018 .
  2. ↑ a b c NASA Exoplanet Archive: Confirmed Planet Overview Page - Kepler-1625 b. Retrieved October 8, 2018 .
  3. ↑ SIMBAD : Kepler-1625. Retrieved October 8, 2018 .
  4. ↑ a b Stars and Space from July 27, 2017: Giant moon discovered around distant exoplanets? Retrieved September 28, 2017 .
  5. ↑ Morton, T. et al .: False positive probabilities for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives . arxiv : 1605.02825 .
  6. ^ Mathur, S. et al .: Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run . arxiv : 1609.04128 .
  7. ↑ a b c d e f Teachey, A. et al .: HEK VI: On the Dearth of Galilean analogue in Kepler and the Exomoon Candidate Kepler I 1625b . arxiv : 1707.08563 .
  8. ↑ Hubble hunts first exomoon, new frontiers in search for ET October 29, 2017, accessed December 18, 2017 .
  9. ↑ K. Rodenbeck, R. Heller, M. Hippke, L. Gizon: Revisiting the exomoon candidate signal around Kepler-1625b . In: Astronomy & Astrophysics Supplement Series . September. arxiv : 1806.04672 .
  10. ↑ Alex Teachey, David M. Kipping: Evidence for a large exomoon orbiting Kepler-1625b. Science Advances , October 3, 2018, accessed October 4, 2018 . doi : 10.1126 / sciadv.aav1784
  11. ↑ First exomoon discovered? Spektrum.de, October 3, 2018, accessed October 8, 2018 .