Free floating planets
... of a planet outside our solar system that is potentially habitable, with Earth-like temperatures. The planet was discovered by the European Southern Observatory's telescope in La Silla, Chile, which has a special instrument that splits light to find wobbles in different wave lengths. Those wobbles c ...
... of a planet outside our solar system that is potentially habitable, with Earth-like temperatures. The planet was discovered by the European Southern Observatory's telescope in La Silla, Chile, which has a special instrument that splits light to find wobbles in different wave lengths. Those wobbles c ...
Comet-like tail-formation of exospheres of hot rocky exoplanets
... Revised 16 August 2010 Accepted 23 August 2010 Available online 27 August 2010 Keywords: Extrasolar planets Planetary formation Atmospheres, Composition ...
... Revised 16 August 2010 Accepted 23 August 2010 Available online 27 August 2010 Keywords: Extrasolar planets Planetary formation Atmospheres, Composition ...
Temperate Earth-sized planets transiting a nearby ultracool
... Here we report observations of three short-period Earth-sized planets transiting an ...
... Here we report observations of three short-period Earth-sized planets transiting an ...
Powerpoint file
... There are only two astronomical bodies that have a radius ~ 1 REarth: 1. White Dwarf 2. A terrestrial planet White Dwarfs have a mass of ~ 1 Solar Mass, so the radial velocity amplitude should be ~ 100s km/s. This is excluded by low precision radial velocity measurements. ...
... There are only two astronomical bodies that have a radius ~ 1 REarth: 1. White Dwarf 2. A terrestrial planet White Dwarfs have a mass of ~ 1 Solar Mass, so the radial velocity amplitude should be ~ 100s km/s. This is excluded by low precision radial velocity measurements. ...
How to Directly Image a Habitable Planet Around Alpha Centauri
... it may be able to directly image such worlds [1]. The 2030s may prove to be an exciting era of an even larger high contrast space telescope of 4m or higher aperture [4,5], capable of surveying hundreds of stars for potentially habitable planets and taking spectra with high enough resolution to deter ...
... it may be able to directly image such worlds [1]. The 2030s may prove to be an exciting era of an even larger high contrast space telescope of 4m or higher aperture [4,5], capable of surveying hundreds of stars for potentially habitable planets and taking spectra with high enough resolution to deter ...
habitability - Dr. Jonti Horner
... The role of the properties of single stars and stellar groups The variety of stars Stars form from fragments of interstellar clouds. As the fragment collapses it forms a circumstellar disk of gas and dust. Nearly all of the gas is hydrogen and helium. The dust, which accounts for up to a few percent ...
... The role of the properties of single stars and stellar groups The variety of stars Stars form from fragments of interstellar clouds. As the fragment collapses it forms a circumstellar disk of gas and dust. Nearly all of the gas is hydrogen and helium. The dust, which accounts for up to a few percent ...
Formation and Detectability of Terrestrial Planets around
... & Bromley 2006) in which collisions of isolated embryos, protoplanets of approximately lunar mass, dominate the evolution of the disk. During this phase, gravitational interactions among planetary embryos serve to form the final planetary system around the star and clear out the remaining material i ...
... & Bromley 2006) in which collisions of isolated embryos, protoplanets of approximately lunar mass, dominate the evolution of the disk. During this phase, gravitational interactions among planetary embryos serve to form the final planetary system around the star and clear out the remaining material i ...
Constraints on the exosphere of CoRoT-7b*
... its stellar wind is also quite similar to that of the Sun. Because the star is an active G-star, we can safely assume that there is a stellar wind that will interact with the planets. Before we go ahead and try to detect the material released from the surface, we discuss how likely the planet is to ...
... its stellar wind is also quite similar to that of the Sun. Because the star is an active G-star, we can safely assume that there is a stellar wind that will interact with the planets. Before we go ahead and try to detect the material released from the surface, we discuss how likely the planet is to ...
On the migration of a system of protoplanets
... on the two planets and the accretion rates on to them. Owing to limited computational resources, the higher resolution model was run only for a few hundred orbital periods, and the largest difference (2.5 per cent) occurred in the mass m3 of the outer planet. The difference in radial position (migra ...
... on the two planets and the accretion rates on to them. Owing to limited computational resources, the higher resolution model was run only for a few hundred orbital periods, and the largest difference (2.5 per cent) occurred in the mass m3 of the outer planet. The difference in radial position (migra ...
On the migration of a system of protoplanets
... on the two planets and the accretion rates on to them. Owing to limited computational resources, the higher resolution model was run only for a few hundred orbital periods, and the largest difference (2.5 per cent) occurred in the mass m3 of the outer planet. The difference in radial position (migra ...
... on the two planets and the accretion rates on to them. Owing to limited computational resources, the higher resolution model was run only for a few hundred orbital periods, and the largest difference (2.5 per cent) occurred in the mass m3 of the outer planet. The difference in radial position (migra ...
Temperate Earth-sized planets transiting a nearby ultracool dwarf star
... volatile-rich Earth-sized planets7. Here we report observations of three short-period Earth-sized planets transiting an ultracool dwarf star only 12 parsecs away. The inner two planets receive four times and two times the irradiation of Earth, respectively, placing them close to the inner edge of th ...
... volatile-rich Earth-sized planets7. Here we report observations of three short-period Earth-sized planets transiting an ultracool dwarf star only 12 parsecs away. The inner two planets receive four times and two times the irradiation of Earth, respectively, placing them close to the inner edge of th ...
Improving the Gaia planet catch by combining the astrometry with
... parameters and the accurate mass of the planet. Gaia will be the first space mission to reach astrometric precision capable to detect planetary companions around stars brighter than 15th mag. Astrometry is more sensitive to planets with large periods, in contrast with radial velocities (RV) methods ...
... parameters and the accurate mass of the planet. Gaia will be the first space mission to reach astrometric precision capable to detect planetary companions around stars brighter than 15th mag. Astrometry is more sensitive to planets with large periods, in contrast with radial velocities (RV) methods ...
Search for Other Worlds - Science fiction 20 years
... Variations in the star's radial velocity can be deduced from displacements in the star's spectral lines due to the Doppler effect. If the motion is towards the observer the received wavelengths are shorter than those emitted by the source, and longer if the motion is away from the observer. ‘Whereas ...
... Variations in the star's radial velocity can be deduced from displacements in the star's spectral lines due to the Doppler effect. If the motion is towards the observer the received wavelengths are shorter than those emitted by the source, and longer if the motion is away from the observer. ‘Whereas ...
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 ...
Planet-finding Activity Guide How do we find planets around other
... position changes. If an object like a planet is orbiting the star, it will wobble somewhat in its path. From the distance of about 35 light years, Jupiter would cause the Sun’s position to change by 1/1000th of an arc second over a 12-year period. But how much is that? This is about the same as d ...
... position changes. If an object like a planet is orbiting the star, it will wobble somewhat in its path. From the distance of about 35 light years, Jupiter would cause the Sun’s position to change by 1/1000th of an arc second over a 12-year period. But how much is that? This is about the same as d ...
Transit surveys for Earths in the habitable zones of white dwarfs
... To date the search for habitable Earth-like planets has primarily focused on nuclear burning stars. I propose that this search should be expanded to cool white dwarf stars that have expended their nuclear fuel. I define the continuously habitable zone of white dwarfs, and show that it extends from ≈ ...
... To date the search for habitable Earth-like planets has primarily focused on nuclear burning stars. I propose that this search should be expanded to cool white dwarf stars that have expended their nuclear fuel. I define the continuously habitable zone of white dwarfs, and show that it extends from ≈ ...
by Kendrick Frazier Pluto turns out not to be responsible for
... "It could be there if it's inclined 37 degrees or more north of the ecliptic and in the area I didn't get to examine because of World W a r II," notes T o m b a u g h . " O r it could be in the extreme s o u t h e r n area of the sky, south of where I could observe from Flagstaff." The unobserved so ...
... "It could be there if it's inclined 37 degrees or more north of the ecliptic and in the area I didn't get to examine because of World W a r II," notes T o m b a u g h . " O r it could be in the extreme s o u t h e r n area of the sky, south of where I could observe from Flagstaff." The unobserved so ...
AST1100 Lecture Notes
... be able to see the Earth with the best telescopes under very good atmospheric conditions (provided the atmosphere on this planet is similar to the Earth’s)! The Hubble Space Telescope which is not limited by the atmosphere can reach a resolution of 0.1′′ . For the people on a planet orbiting a star ...
... be able to see the Earth with the best telescopes under very good atmospheric conditions (provided the atmosphere on this planet is similar to the Earth’s)! The Hubble Space Telescope which is not limited by the atmosphere can reach a resolution of 0.1′′ . For the people on a planet orbiting a star ...
New Worlds Ahead: The Discovery of Exoplanets
... (K∗ increases with m), as well as shorter period (i.e. close-in) planets. Planets are also easier to find around low-mass stars than heavier stars. Furthermore, a planet must at least complete one full orbit in order to have its parameters constrained (although more orbits are usually needed to obta ...
... (K∗ increases with m), as well as shorter period (i.e. close-in) planets. Planets are also easier to find around low-mass stars than heavier stars. Furthermore, a planet must at least complete one full orbit in order to have its parameters constrained (although more orbits are usually needed to obta ...
Detecting the glint of starlight on the oceans of distant planets
... the ocean that is responsible for the glint is only ∼4%. Thus the specular term in Eq. (6) under clear skies is (0.55)(5.2 × 10−6 )(0.04)/10−5 = 0.011, or 5% of the diffuse signal. However, both pwav and Awtr of Eq. (6) increase rapidly with stellar zenith angle, which is large for planets in cresce ...
... the ocean that is responsible for the glint is only ∼4%. Thus the specular term in Eq. (6) under clear skies is (0.55)(5.2 × 10−6 )(0.04)/10−5 = 0.011, or 5% of the diffuse signal. However, both pwav and Awtr of Eq. (6) increase rapidly with stellar zenith angle, which is large for planets in cresce ...
Kepler Mission: The Search for Earth-sized Planets
... For which of these star(s) will Kepler be able to detect transiting planets? ...
... For which of these star(s) will Kepler be able to detect transiting planets? ...
ISIMA lectures on celestial mechanics. 3
... more precisely, what is its lifetime before some catastrophic event such as a collision or ejection—without having to integrate the planetary orbits for the lifetime of the host star. There are two discouraging lessons from studies of the stability of the solar system that we should bear in mind. Fi ...
... more precisely, what is its lifetime before some catastrophic event such as a collision or ejection—without having to integrate the planetary orbits for the lifetime of the host star. There are two discouraging lessons from studies of the stability of the solar system that we should bear in mind. Fi ...
Kepler-452b is not a new Earth A twin of the Sun
... Best evidence of first generation stars in the universe Astronomers have long theorised the existence of a first generation of stars — known as Population III stars — that were born out of the primordial material from the Big Bang. The name Population III arose because astronomers had already classe ...
... Best evidence of first generation stars in the universe Astronomers have long theorised the existence of a first generation of stars — known as Population III stars — that were born out of the primordial material from the Big Bang. The name Population III arose because astronomers had already classe ...
Giant Planets at Small Orbital Distances
... at Rp's around 4 RJ , regardless of the mass of the planet. The planet's internal luminosity tends to zero and its eective temperature tends to Teq. The present Jupiter is depicted by a diamond in the lower right-hand corner of Figure 2. Its evolutionary track closely follows the convective Hayashi ...
... at Rp's around 4 RJ , regardless of the mass of the planet. The planet's internal luminosity tends to zero and its eective temperature tends to Teq. The present Jupiter is depicted by a diamond in the lower right-hand corner of Figure 2. Its evolutionary track closely follows the convective Hayashi ...
Gemini - Sochias
... Gemini/Hokupa’a. BD can exist that close to the main star (Liu et al. AJ, 2002) ...
... Gemini/Hokupa’a. BD can exist that close to the main star (Liu et al. AJ, 2002) ...
Gliese 581
Gliese 581 (/ˈɡliːzə/) is a star of spectral type M3V (a red dwarf) about 20 light years away from Earth in the constellation Libra. Its estimated mass is about a third of that of the Sun, and it is the 89th closest known star to the Sun. Observations suggest that the star has a planetary system consisting of three known planets, designated Gliese 581 b, c, and e and a possibly confirmed planet, d, in order of discovery. Additional outer planets, which received the designations Gliese 581 f, and g have been proposed, but the evidence that led to the discovery claims has been shown to be the result of stellar activity mimicking the radial velocity variations due to orbiting planets.Gliese 581 has been the subject of a ""huge amount of attention"" in the quest to discover the first habitable extrasolar planet; first for c, and then d and g. Gliese 581 c, the first low-mass extrasolar planet found near a habitable zone, was discovered in April 2007. It has since been shown that under known terrestrial planet climate models, Gliese 581 c is likely to have a runaway greenhouse effect, and hence is probably too hot to be habitable, analogous to Venus. The proposed planets Gliese 581 d and Gliese 581 g also received attention as being located within the habitable zone, but their existence has subsequently been put into doubt by some authors.On 27 November 2012, the European Space Agency announced a debris disk, with at least ten times as many comets as the Solar System. This put constraints on possible planets beyond 0.75 AU.