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Kepler-11

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Last Updated: 18 January 2022

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General | Latest Info

Kepler-11

Observation data Epoch J2000 Equinox J2000
ConstellationCygnus
Right ascension19 h 48 m 27.6228 s
Declination+41 54 32.903
Apparent magnitude (V)14.2
Characteristics
Spectral typeG6V
Database references
SIMBADdata
KICdata
Exoplanet Comparison Kepler-11 c.png "Exoplanet Comparison Kepler-11 c.png", by Aldaron, a.k.a. Aldaron, licensed under CC BY-SA 3.0

Remarkable Planetary System Discovered By NASAs Kepler Mission Has Six Planets Around Sun-like Star, Including Five Small Planets In Tightly Packed Orbits. Astronomers at University of California, Santa Cruz, and their coauthors analyze Orbital dynamics of system, determine sizes and masses of planets, and figure out their likely compositions, all based on Keplers measurements of changing brightness of host Star as planets pass in front of it. Not only is this amazing Planetary system, it also validates powerful new method to measure masses of planets, said Daniel Fabrycky, Hubble postdoctoral fellow at UC Santa Cruz, who led Orbital dynamics analysis. Fabrycky and Jack Lissauer, scientists at NASA Ames Research Center in Mountain View, are lead authors of paper on Kepler-11 published in February 3rd issue of Nature. Five inner planets in Kepler-11 system range in size from 2. 3 to 13. 5 Times Mass of Earth. Their Orbital periods are all less than 50 days, so they orbit within region that would fit inside Orbit of Mercury in our solar system. Sixth Planet Is Larger And Farther Out, With Orbital Period Of 118 Days And Undetermined Mass. Of six planets, most massive are potentially like Neptune and Uranus, but three lowest mass planets are unlike anything we have in our solar system, say Jonathan Fortney, assistant professor of Astronomy and Astrophysics at UCSC, who leads work on understanding structure and composition of planets, along with UCSC graduate students Eric Lopez and Neil Miller. Kepler Space Telescope Detects Planets That Transit Or Pass In Front Of Their Host Star, Causing Periodic Dips In Brightness Of Star As Measured By Telescopes Sensitive Photometer. Amount Of Brightness Reduction Tells Scientists How Big Planet Is In Terms Of Its Radius. Time Between transits tells them Orbital period. To determine Planet masses, analyzed slight variations in Orbital Periods caused by gravitational interactions among planets. Timing Of Transits Is Not Perfectly Periodic, And That Is Signature Of Planets Gravitationally Interacting, He Say. By developing Model of Orbital dynamics, we work out masses of planets and verify that system can be stable on long time scales of millions of years. Previously, detections of transiting planets have been followed up with observations from powerful ground-base telescopes to confirm planet and determine its Mass using Doppler spectroscopy, which measures wobbling in motion of Star caused by gravitational tug of planet. With Kepler-11, however, planets are too small and Star is too faint for Doppler spectroscopy to work. This is likely to be case with many of planets detected by Kepler Mission, main goal of which is to find small, Earth-size planets in habitable zones of their stars.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Nomenclature and history

1 Space Research Institute, Austrian Academy Sciences, Schmiedlstrasse 6 8042 Graz, Austria e-mail: daria. Kubyshkina oeaw. Ac. At 2 Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE-221 00 Lund, Sweden 3 Institute of Computational Modelling, SB RAS, 660036 Krasnoyarsk, Russia 4 Siberian Federal University, 660041 Krasnoyarsk, Russia 5 Institute for University of Vienna, Turkenschanzstrasse 17 1180 Vienna, Austria 6 Observatoire astronomique de lUniversite de Geneve 51 ch. Des Maillettes, 1290 Sauverny, Switzerland 7 Institute of Physics / IGAM, University of Graz, Universitatsplatz 8010 Graz, Austria. Atmospheres Of Close-In Planets Are Strongly Influenced By Mass Loss Drive By High-energy Irradiation Of Host Star, Particularly During Early Stages Of Evolution. We have recently developed framework to exploit this connection and enable us to recover past evolution of stellar high-energy emission from present-day properties of its planets, if latter retain some remnants of their primordial hydrogen-dominated atmospheres. Furthermore, framework can also provide on planetary initial atmospheric mass fractions. Constraints on output parameters when more planets can be simultaneously analyse. This makes Kepler-11 system, which hosts six planets with bulk densities between 0. 66 and 2. 45 g 3, ideal target. Our results indicate that star has likely evolved as slow rotator, corresponding to high-energy emissions at 150 Myr of between 1 and 10 times that of current Sun. We also constrain initial atmospheric mass fractions for planets, obtaining lower limit of 4. 1 percentage planet c, range of 3. 7-5. 3 percentage for planet d, of 11. 1-14 percentage planets e, range of 1-15. 6 percentage for planet f, range of 4. 7-8. 7 percentage planet g assuming disc dispersal time of 1 Myr. For planet b, range poorly constrain. Our framework also suggests slightly higher masses for b, c, and f than have been suggested based on transit timing variation measurements. We couple our results with published planet atmosphere accretion models to temperature and dispersal time of protoplanetary disc of 550 K and 1 Myr, although these results may be affected by inconsistencies in adopted system parameters. This work shows that our framework is capable of constraining important of planet formation models.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Description

Kepler-11c is exoplanet discovered in orbit of Sun-like star Kepler-11 by Kepler spacecraft, NASA Telescope aiming to discover Earth-like planets. It is second planet from its parent star, and is most likely water planet with thin hydrogen-helium atmosphere. Kepler-11c orbits Kepler-11 every 10 days, and has estimated density twice that of pure water. It is estimated to have mass thirteen times that of Earth and radius that is three times greater than that of Earth. Kepler-11c and its five sister planets form first discover System with more than three transiting planets. Kepler-11 System Also Holds Record Of Being Most Compact And Flattest System Discover. Kepler-11c and other Kepler-11 planets were announced to public on February 2 2011, and were published in Nature day later.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Sources

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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