| 词条 | EPIC 211945201 b |
| 释义 |
OverviewThe exoplanet EPIC 211945201 b was discovered in 2018 using the transit method. Using this method, astronomers can see everything from methane to water vapor on other planets by photometry.[3] It is the only planet orbiting around EPIC 211945201, a G0 class star, situated in the constellation of Cancer in 596 light-years from the Sun. Its host star is aged 4 billion years. EPIC 211945201 b orbits its star in about 19 terrestrial days.[4] It orbits closer to the star than the internal limit of the habitable zone. It has a low density and may be composed of gas. It has a low Earth similarity index (0.14) and should be very different from our planet. DiscoveryEPIC 211945201 b was found to be a planetary candidate from K2 photometry in Campaigns 5 & 16. The exoplanet transits the bright star (Vmag = 10.15, G0 spectral type) in a 19.492 day orbit. The photometric data combined with false positive probability calculations using VESPA may not be sufficient to confirm the planetary scenario but high-resolution spectroscopic are taken using the PARAS spectrograph (19 radial velocity observations) over a time-baseline of 420 days.[5] The data shows that the planet has a radius of 6.12 ± 0.1 R⊕, and a mass of {{Val|27|14|12.6}} M⊕. It consists of a density of {{Val|0.65|0.34|0.30}} g/cm3. Based on the mass and radius, it estimates that the heavy element content is 60-70 % of the total mass.[5] The surface temperature of the planet was found to be around 776.35 K, as it is very close to the host star.[6] It is seven times nearer to its star, in comparison with Earth-Sun distance. This shows that the extra-solar planet is in the uninhabitable zone. The discovery is of importance for understanding the formation mechanism of such super-Neptune or sub-Saturn kind of planets, that are too close to the host star, according to scientists.[2] See also
References1. ^{{Cite web|url=https://exoplanets.nasa.gov/newworldsatlas/6307/epic-211945201-b/|title=EPIC 211945201 b {{!}} New World Atlas - Exoplanet Exploration: Planets Beyond our Solar System|website=Exoplanet Exploration: Planets Beyond our Solar System|access-date=2018-07-03}} {{Exoplanet search projects}}{{2018 in space}}2. ^1 {{Cite web|url=http://indpaedia.com/ind/index.php/Astronomy,_Astrophysics:_India|title=Astronomy, Astrophysics: India - Indpaedia|website=indpaedia.com|language=en-GB|access-date=2018-07-05}} 3. ^{{Cite web|url=https://exoplanets.nasa.gov/5-ways-to-find-a-planet/#/2|title=5 Ways to Find a Planet|website=exoplanets.nasa.gov|access-date=2018-07-03}} 4. ^{{Cite web|url=http://exoplorer.org/en/exoplanets/epic-211945201-b|title=Exoplorer: epic-211945201-b|last=Telechev|first=Anton|website=exoplorer.org|language=en|access-date=2018-07-03}} 5. ^1 2 {{Cite journal|last=Chakraborty|first=Abhijit|date=May 10, 2017|title=Evidence of a Sub-Saturn around Epic 211945201|url=https://arxiv.org/pdf/1805.03466.pdf|journal=The Astronomical Journal|volume=1|issue=1805.03466|pages=1-15|doi=10.3847/1538-3881/aac436|via=Cornell University Library|arxiv=1805.03466|bibcode=2018AJ....156....3C}} 6. ^{{Cite web|url=http://exoplanet.eu/catalog/hats-36_b/|title=The Extrasolar Planet Encyclopaedia — HATS-36 b|website=exoplanet.eu|access-date=2018-07-05}} 4 : Transiting exoplanets|Exoplanets detected by direct imaging|Exoplanets discovered in 2018|Cancer (constellation) |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。