Kepler-737b

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Kepler-737b
Discovery
Discovered byHARPS, Kepler space telescope
Discovery dateMay 10, 2016
Detection method
Transit
Designations
Alternative names
KOI-947.01, KIC 9710326, Gaia DR2 2126820324123177472 b
Orbital characteristics
Semi-major axis
0.1422 AU
Eccentricitynull
Orbital period
29.5992 days
Inclinationnull
StarKepler-737
Physical characteristics
Mean radius
1.96 R⊕
Mass4.5 M⊕
Mean density
3.3 g/cm³
Surface gravity
1.1714 earth
Temperature298 K (25 °C; 77 °F)

Kepler-737b is a super-Earth exoplanet 669 light years away.[1]

Properties and nomenclature[]

Properties[]

Planet properties[]

Kepler-737b is an exoplanet with 4.5 earth masses and 1.96x earth radii[1] (0.175 Jupiter radii.) It orbits every 28.5992 days.[2] It is well within the inner part of the habitable zone. If it is not gassy, then it might be habitable. It would be hotter than earth, due to its semimajor axis of 0.1422 AU.[1]

Star[]

The star can be called Kepler-737, KOI-947, and so on.[2] It is an early M-star. The mass is 0.51 solar masses and its radius is 0.48 times that of the sun.[2] The temperature of the star is 3813 K and its metallicity is -0.24, significantly lower than the sun's.[2] This star has been around for 3.89 billion years, for 680 million years less than the sun.[3]

Discovery[]

Kepler-737b is a confirmed exoplanet that was found by Kepler using the transit method.[2] It was discovered on May 10,[2] 2016.[1]

Nomenclature[]

Kepler-737b is also called KOI-947.01, KIC 9710326, and Gaia DR2 2126820324123177472 b.[2][4] KOI means "Kepler Object of Interest" and KIC means "Kepler Input Catalog". Gaia is a European satellite that was launched on December 19, 2013.[5]

Habitability[]

Main article: Habitability of red dwarf systems

Section 1[]

Kepler-737b is in the habitable zone.[2] However, it is likely tidally locked due to its short orbit; a tidally locked planet would have one side facing the star permanently while the other in constant darkness.[6] This would make one side too hot to live on, while the other too cold. But there may be a "sweet spot" in between the two, where liquid water can exist. This spot would be the planet's terminator. Kepler-737b might also have atmospheric circulation that would distribute the heat around the planet, making a large portion of it habitable.[7] Water on Kepler-737b's surface could also distribute heat.[8]

Section 2[]

Kepler-737b's density is similar to that of the moon, so it could either be a rocky world with no iron core, or a water world. The fact that the planet is quite likely to have no magnetic field could spark adaptations to the relatively high radiation level, such as a thick shell of a substance that could repel the radiation or tardigrade-like DNA. In most earthly creatures, DNA is damaged permanently, but with tardigrades, DNA is repairable after being damaged by deadly radiation.[9]

Section 3[]

There is a reduced chance of intelligent life on Kepler-737b due to the fair chance that it is a water world, with no dry land. It is likely hotter than earth, due to its gravity being slightly higher than earth's (17% higher) and its semimajor axis. Another reason why Kepler-737b is likely hotter than earth is its equilibrium temperature of 298 K (25 °C; 77 °F).[10] If ice caps exist, then they would likely be much smaller than earth's, due to the temperature as well as to the possibility that Kepler-737b has more carbon dioxide in its atmosphere than earth.[a] It would have accreted the carbon dioxide by gravity or because water worlds are likely to have a lot of carbon dioxide in their atmospheres. More carbon dioxide in an atmosphere equalizes the temperature.

See also[]

Notes[]

  1. ^ Does not include all possible factors.

References[]

  1. ^ Jump up to: a b c d "Exoplanet-catalog – Exoplanet Exploration: Planets Beyond our Solar System Kepler-737 b".
  2. ^ Jump up to: a b c d e f g h "Open Exoplanet Catalogue - Kepler-737 b". www.openexoplanetcatalogue.com. Retrieved 2021-05-11.
  3. ^ "The Extrasolar Planet Encyclopaedia — Kepler-737 b". exoplanet.eu. Retrieved 2021-05-11.
  4. ^ "KOI-947.01". Retrieved 2021-05-24.
  5. ^ "Gaia | Description & Facts". Encyclopedia Britannica. Retrieved 2021-05-24.
  6. ^ "Tidally locked exoplanets may be more common than previously thought". UW News. Retrieved 2021-05-18.
  7. ^ Hammond, Mark; Lewis, Neil T. (2021-03-30). "The rotational and divergent components of atmospheric circulation on tidally locked planets". Proceedings of the National Academy of Sciences. 118 (13). arXiv:2102.11760. doi:10.1073/pnas.2022705118. ISSN 0027-8424. PMID 33753500.
  8. ^ Sutter, Paul (2021-03-08). "Can super-rotating oceans cool off extreme exoplanets?". Space.com. Retrieved 2021-05-18.
  9. ^ "Are tardigrades really aliens? | A World Unseen: the diversity of life". u.osu.edu. Retrieved 2021-05-11.
  10. ^ Guo, Xueying; Ballard, Sarah; Dragomir, Diana; Werner, Michael; Livingston, John; Gorjian, Varoujan (July 2019). "Temperate Super-Earths/Mini-Neptunes around M/K Dwarfs Consist of Two Populations Distinguished by Kepler and Spitzer Transit Depth Variations". The Astrophysical Journal. 880 (1): 64. arXiv:1804.00071. doi:10.3847/1538-4357/ab24be. ISSN 0004-637X.
  11. ^ "TRAPPIST-1 system planets potentially habitable". phys.org. Retrieved 2021-05-21.

External links[]

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