Research Paper Trojans in Habitable Zones
... We investigated Trojan-like motion in four extrasolar planetary systems with numerical simulations of the restricted three-body problem and the three-body problem with different mass ratios of the primary bodies. In this work, we studied the dynamical stability of the Trojan configuration where the ...
... We investigated Trojan-like motion in four extrasolar planetary systems with numerical simulations of the restricted three-body problem and the three-body problem with different mass ratios of the primary bodies. In this work, we studied the dynamical stability of the Trojan configuration where the ...
Temperate Earth-sized planets transiting a nearby ultracool dwarf star
... Star-like objects with effective temperatures of less than 2,700 kelvin are referred to as ‘ultracool dwarfs’1. This heterogeneous group includes stars of extremely low mass as well as brown dwarfs (substellar objects not massive enough to sustain hydrogen fusion), and represents about 15 per cent o ...
... Star-like objects with effective temperatures of less than 2,700 kelvin are referred to as ‘ultracool dwarfs’1. This heterogeneous group includes stars of extremely low mass as well as brown dwarfs (substellar objects not massive enough to sustain hydrogen fusion), and represents about 15 per cent o ...
Meteors and Comets
... hot and begin to glow brightly. Meteors can burn up before they reach the Earth, but occasionally a meteor will hit the ground hard enough to form a crater. When a meteor makes it all the way to Earth, it is then called a meteorite. One famous meteorite crater is in Arizona. The Barringer Meteor Cra ...
... hot and begin to glow brightly. Meteors can burn up before they reach the Earth, but occasionally a meteor will hit the ground hard enough to form a crater. When a meteor makes it all the way to Earth, it is then called a meteorite. One famous meteorite crater is in Arizona. The Barringer Meteor Cra ...
Signatures of planets and of planet formation in debris disks Mark
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
... Main sequence M stars are the most abundant stars in our galaxy, they have features that make them an attractive target for Astrobiology, but their strong chromospheric activity produces high energy radiation and charged particles that may be detrimental to life. We study the impact of a strong flar ...
Planets orbiting stars more massive than the Sun
... In order to prove that this star has a substellar companion, we have shown that it is not an FP, and that the companion is not a low-mass star. As shown by Almenara et al. (2009) most of the binaries and FPs can already be identified with a very detailed analysis of the light-curve. After this had b ...
... In order to prove that this star has a substellar companion, we have shown that it is not an FP, and that the companion is not a low-mass star. As shown by Almenara et al. (2009) most of the binaries and FPs can already be identified with a very detailed analysis of the light-curve. After this had b ...
Core instability models of giant planet accretion – II. Forming
... form several cores in the same disc. Initially we start the simulation with a number N planets,0 of cores through the disc, separated by 10 rH . This could have important consequences on the final distribution of masses and semimajor axis of extrasolar planets, especially for the changes in the dyna ...
... form several cores in the same disc. Initially we start the simulation with a number N planets,0 of cores through the disc, separated by 10 rH . This could have important consequences on the final distribution of masses and semimajor axis of extrasolar planets, especially for the changes in the dyna ...
Kohoutek Is Coming - Institute of Current World Affairs
... larly visible to the naked eye for about six weeks before and after that ...
... larly visible to the naked eye for about six weeks before and after that ...
Chapter 18 - Astronomy
... Summary of Chapter 18 • The interstellar medium is made up of cold gas and small dust grains • Dust preferentially absorbs shorter wavelengths, causing reddening • Dust can also completely block light • Dust grains must be elongated, as they polarize light • Emission nebula: Gas that glows on its o ...
... Summary of Chapter 18 • The interstellar medium is made up of cold gas and small dust grains • Dust preferentially absorbs shorter wavelengths, causing reddening • Dust can also completely block light • Dust grains must be elongated, as they polarize light • Emission nebula: Gas that glows on its o ...
Our Solar System 6.1 Planets 6.2 Dwarf planets and other solar
... Procedure: Read through the following passage. In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the mat ...
... Procedure: Read through the following passage. In space, most (90%) of all stars are actually double-star systems in which two stars orbit each other. This close orbit prohibits any planets from forming. Our solo star system gave way for planets to form. It is thought by astronomers that had the mat ...
Unpublished draft available in format
... same thing; in the case of stars, any given star may demonstrate a whole string of concepts; e.g. a giant star of a late spectral type (M, R, N, S) may also be a long-period variable. Theoretically it is possible to achieve a class number which compounds all such attributes, but this might be a very ...
... same thing; in the case of stars, any given star may demonstrate a whole string of concepts; e.g. a giant star of a late spectral type (M, R, N, S) may also be a long-period variable. Theoretically it is possible to achieve a class number which compounds all such attributes, but this might be a very ...
First Stars II
... density; cf. n~1022cm-3 for protostars) Overall evolution is similar to the 1D calculation. The collapse velocity is slower. (why? the effect of rotation, initial condition, turbulence) ...
... density; cf. n~1022cm-3 for protostars) Overall evolution is similar to the 1D calculation. The collapse velocity is slower. (why? the effect of rotation, initial condition, turbulence) ...
The Main Point Comets are
... • Comet nuclei are very dark, typically reflecting < 4% of the incident sunlight (as dark as a charcoal briquet) • Comet nuclei have very low density (0.1 to 0.25 g/cm3), and thus appear to be mostly made of loosely packed (porous or "fluffy") ice • Comets have more than just two types of tails; one ...
... • Comet nuclei are very dark, typically reflecting < 4% of the incident sunlight (as dark as a charcoal briquet) • Comet nuclei have very low density (0.1 to 0.25 g/cm3), and thus appear to be mostly made of loosely packed (porous or "fluffy") ice • Comets have more than just two types of tails; one ...
The Early Evolution of Protostars
... becomes tenuous The luminosity is not an indicator of stellar mass until nuclear burning dominates (Lacc ~ M*dMacc/dt) Stellar ages from tracks may be way off (Baraffe et al. 2009) The initial conditions for planet formation may be determined by time since last episode of disk instability ...
... becomes tenuous The luminosity is not an indicator of stellar mass until nuclear burning dominates (Lacc ~ M*dMacc/dt) Stellar ages from tracks may be way off (Baraffe et al. 2009) The initial conditions for planet formation may be determined by time since last episode of disk instability ...
Comets - from the Greek kome, meaning “hair”. Only visible when far
... jet black. Jets of matter are expelled from small areas on the sunlit side. These jets are what causes the nucleus to rotate once every 53 hours. ...
... jet black. Jets of matter are expelled from small areas on the sunlit side. These jets are what causes the nucleus to rotate once every 53 hours. ...
A sound nebula: the origin of the Solar System in the field of a
... concentrated in the centre, and then began to propagate towards the periphery again: a rapid pressure increase resulted in a dramatic rise in temperature at the centre of the protosun, generating a new hydrogen explosion, much weaker than the first one but still strong enough to give extra energy t ...
... concentrated in the centre, and then began to propagate towards the periphery again: a rapid pressure increase resulted in a dramatic rise in temperature at the centre of the protosun, generating a new hydrogen explosion, much weaker than the first one but still strong enough to give extra energy t ...
AWG recommendation on Cosmic Vision
... frequency of giant planets; the existence and location of such planets is crucial for the possible existence of Earth-like planets in the habitable zone. GAIA will also further improve our understanding of the stellar and Galactic constraints on planet formation and existence. The next major break-t ...
... frequency of giant planets; the existence and location of such planets is crucial for the possible existence of Earth-like planets in the habitable zone. GAIA will also further improve our understanding of the stellar and Galactic constraints on planet formation and existence. The next major break-t ...
Exoplanets Properties of the host stars Characterization of the
... original composition out of which the protostellar and protoplanetary disk formed – In this picture, the higher the metallicity of the primordial cloud, the higher the proportion of dust to gas in the protoplanetary disk – This facilitates condensation of solids and accelerates protoplanetary accr ...
... original composition out of which the protostellar and protoplanetary disk formed – In this picture, the higher the metallicity of the primordial cloud, the higher the proportion of dust to gas in the protoplanetary disk – This facilitates condensation of solids and accelerates protoplanetary accr ...
Nebulae - Innovative Teachers BG
... increases its radius and its surface Eskimo Nebula temperature decreases. Such stars are called red giants. At certain stage the gravity can not keep expansion of the outermost regions of the star, and the stellar matter runs away forming an expanding bubble in the space surrounding the star. The de ...
... increases its radius and its surface Eskimo Nebula temperature decreases. Such stars are called red giants. At certain stage the gravity can not keep expansion of the outermost regions of the star, and the stellar matter runs away forming an expanding bubble in the space surrounding the star. The de ...
Origin of the Earth and of the Solar System
... Rotating gas and dust clouds contract to accretion discs, since only in the equatorial plane gravitation and centrifugal force ban be in equilibrium. The picture sequence (Source: Nature) shows the (successful) simulation of the formation of protoplanets in an ...
... Rotating gas and dust clouds contract to accretion discs, since only in the equatorial plane gravitation and centrifugal force ban be in equilibrium. The picture sequence (Source: Nature) shows the (successful) simulation of the formation of protoplanets in an ...
Solar System Formation Reading
... objects, protoplanets. Quite quickly (in less than 100 million years - that's short compared to the 4.5 billion year age of the solar system) the collision and coalescence leads to a few large objects that orbit in roughly circular orbits, with a fair amount of junk in between. At some point all of ...
... objects, protoplanets. Quite quickly (in less than 100 million years - that's short compared to the 4.5 billion year age of the solar system) the collision and coalescence leads to a few large objects that orbit in roughly circular orbits, with a fair amount of junk in between. At some point all of ...
The Formation of Stars and Solar Systems
... few atoms. These cosmic spaces comprise dense clouds of dust and gas left over from galaxy formation. • Since these clouds are cooler than most places, they are perfect breeding grounds for star birth. When the density is 1,000 times greater than what is found in normal interstellar space, many atom ...
... few atoms. These cosmic spaces comprise dense clouds of dust and gas left over from galaxy formation. • Since these clouds are cooler than most places, they are perfect breeding grounds for star birth. When the density is 1,000 times greater than what is found in normal interstellar space, many atom ...
Orbital and Physical Characteristics of Extrasolar Planets Systems
... To the very time of the detection of the first extrasolar planet system, our concept was based only upon the study of the Solar system structure. As is well known, the later has been formed around a main sequence star (The Sun) of late spectral type-G2V. According to the statistical analysis of the ...
... To the very time of the detection of the first extrasolar planet system, our concept was based only upon the study of the Solar system structure. As is well known, the later has been formed around a main sequence star (The Sun) of late spectral type-G2V. According to the statistical analysis of the ...
A sound nebula: the origin of the Solar System in the field of a
... concentrated in the centre, and then began to propagate towards the periphery again: a rapid pressure increase resulted in a dramatic rise in temperature at the centre of the protosun, generating a new hydrogen explosion, much weaker than the first one but still strong enough to give extra energy t ...
... concentrated in the centre, and then began to propagate towards the periphery again: a rapid pressure increase resulted in a dramatic rise in temperature at the centre of the protosun, generating a new hydrogen explosion, much weaker than the first one but still strong enough to give extra energy t ...