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Kepler-107

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Last Updated: 18 January 2022

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General | Latest Info

Kepler-107

ConstellationCygnus
Right ascension19 h 48 m 06.7736 s
Declination+48 12 30.9619
Apparent magnitude (V)B= 13.34, V= 12.70, J= 11.39, K= 11.06
Characteristics
Spectral typeG2V
Database references
SIMBADdata

Since, in 1995, first extrasolar planet was discovered, almost 4 000 planets have been found around nearest stars. This allows us to study large variety of configurations for these planetary systems. Evolution of planets orbiting other stars can be affect, mainly, by two phenomena: evaporation of upper layers of planet due to effect of X-rays and ultraviolet emit by central star, and by impacts of other celestial bodies of size of planet. Former effects have been observed number of times in extrasolar systems, but until now there has been no proof of existence of major impacts, as has apparently occurred in Kepler 107 system. Central Star, Kepler 107, Is Bit Bigger Than Sun, And Has Four Planets Rotating Around It; It Was Two Innermost Planets Which Draw Interest Of Astrophysicists. Using data from NASA's Kepler satellite and from National Galileo Telescope at Roque de los Muchachos Observatory, team determined parameters of star, and measured radii and masses of these planets. Although innermost two have similar radii, their are very different. In fact, second is three times denser than first. Extraordinarily High Density Of Planet Kepler 107c Is More Than Double That Of Earth. This exceptional density for planet has intrigued researchers, and suggests that its metallic core, its densest part, is anomalously big for planet. This would be considered normal if it were not for prediction that photo-evaporation cause densest planet in system to be nearest to its star. To explain how it is possible that, in this case, nearest has only half density of second, hypothesis was proposed that planet Kepler 107c was formed as result of major impact. This impact must have ripped away its outer layers, thus leaving central core as much bigger fraction than before. After tests carried out via simulations, hypothesis seems to be most likely. This study will allow us to better understand formation and evolution of exoplanets. Specifically, it picks out importance of relationship between stellar physics and exoplanetary research. We need to know star to better understand planets which are in orbit around it, says Savita Mathur, researcher at IAC in Tenerife, and one of authors of article. In this study we make analysis to estimate parameters of star which host planet. Asteroseismology plays key role in field of exoplanets, because it has been shown that it is one of best methods for precise characterization of stars. That is why, during past decade, it has become one of main methods for characterizing stars, and it will remain so in coming years, thanks to space missions for discovering exoplanets: TESS and PLATO.

* 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

Author(s)

Giant impact as likely origin of different twins in Kepler-107 exoplanet System. / Bonomo, Aldo S.; Zeng, Li; Damasso, Leinhardt, Zoe M.; Justesen, Anders B.; Lopez, Eric; Lund, Mikkel N.; Malavolta, Luca; Silva Aguirre, Victor; Buchhave, Lars. ; Corsaro, Enrico; Denman, Thomas; Lopez-Morales, Mercedes; Mills, Sean M.; Mortier, Annelies; Rice, Ken; Sozzetti, Alessandro; Vanderburg, Andrew; Laura; Arentoft, Torben; Benbakoura, Mansour; Bouchy, Francois; Christensen-Dalsgaard, Jrgen; Collier Cameron, Andrew; Cosentino, Rosario; Dressing, Courtney D.; Dumusque, Xavier; Figueira, Pedro; Fiorenzano, Aldo F. M.; Garcia, Rafael. ; Handberg, Rasmus; Harutyunyan, Johnson, John. ; Kjeldsen, Latham, David W.; Lovis, Christophe; Lundkvist, Mia S.; Mathur, Savita; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Motalebi, Fatemeh; Nascimbeni, Valerio; Nava, Chantanelle; Pepe, Francesco; Phillips, David F.; Piotto, Giampaolo; Poretti, Ennio; Sasselov, Dimitar; Segransan, Damien; Udry, Stephane; Watson, Chris. T1-giant impact as likely origin of different twins in Kepler-107 exoplanet System n2-Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii range from low-density sub-Neptunes containing volatile elements1 to higher-density rocky planets with Earth-like2 or iron-rich3 compositions. Such astonishing diversity in observed small exoplanet compositions may be product of different initial conditions of planet-formation process or different evolutionary paths that alter planetary properties after formation4. Planet evolution may be especially by either photoevaporative Mass loss induced by high stellar X-ray and extreme ultraviolet flux5 or giant impacts6. Although there is some evidence for former7 8, there are no unambiguous findings so far about occurrence of giant impacts on exoplanet System. Here, we characterize innermost planets of compact and near-resonant System Kepler-107. We show that they have nearly identical radii, but outer planet Kepler-107 c is than twice as dense as innermost Kepler-107 B. In consequence, Kepler-107 c must larger iron core fraction than Kepler-107 B. This imbalance cannot be explained by stellar XUV irradiation, which would conversely make more-irradiate and less-massive planet Kepler-107 B denser than Kepler-107 c. Instead, dissimilar densities are consistent with giant impact event Kepler-107 c that would have strip off part of its silicate mantle. This hypothesis is supported by theoretical predictions from collisional mantle stripping10, which match mass and radius of Kepler-107 c. AB-Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii range from low-density sub-Neptunes containing volatile elements1 to higher-density rocky planets with Earth-like2 or iron-rich3 compositions. Such astonishing diversity in observed small exoplanet compositions may be product of different initial conditions of planet-formation process or different evolutionary paths that alter planetary properties after formation4. Planet evolution may be especially affected by either photoevaporative Mass loss induced by high stellar X-ray extreme ultraviolet flux5 or giant impacts6. Although there is some evidence for former7 8, there are no unambiguous findings so far about occurrence of giant impacts on exoplanet System. Here, we characterize two innermost planets of compact near-resonant System Kepler-107.

* 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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