Lecture 14
... As gravity forces a cloud to become smaller, it begins to spin faster and faster, due to conservation of angular momentum. Gas settles into a spinning disk because spin hampers collapse perpendicular to the spin axis. ...
... As gravity forces a cloud to become smaller, it begins to spin faster and faster, due to conservation of angular momentum. Gas settles into a spinning disk because spin hampers collapse perpendicular to the spin axis. ...
Detecting Earth Mass Planets with Gravitational
... deviation must be detected by the microlensing follow-up system. The follow-up system is assumed to observe each lensed star about once per hour with an accuracy of 0.5%È1% so that moderate amplitude deviations can be detected. Then, we require that the light curve deviate from the single lens light ...
... deviation must be detected by the microlensing follow-up system. The follow-up system is assumed to observe each lensed star about once per hour with an accuracy of 0.5%È1% so that moderate amplitude deviations can be detected. Then, we require that the light curve deviate from the single lens light ...
Astro 27 Solar System Formation and ExoPlanets Slide Show
... • The “Slow” scenario: the “seeds” of planet formation are dust grains, into dust bunnies, growing until large enough to be self-gravitating (about ½ mile across) and accelerate growth. Beyond “frost line”, “seeds” would be ices (hydrogen compounds with low melting points). Since H dominates mass, t ...
... • The “Slow” scenario: the “seeds” of planet formation are dust grains, into dust bunnies, growing until large enough to be self-gravitating (about ½ mile across) and accelerate growth. Beyond “frost line”, “seeds” would be ices (hydrogen compounds with low melting points). Since H dominates mass, t ...
Astronomy Today 7th Edition Chaisson/McMillan
... Now known: Solar system has 166 moons, one star, eight planets (added Uranus and Neptune), eight asteroids, and more than 100 Kuiper belt objects more than 300 km in diameter (smaller asteroids, comets, and meteoroids) ...
... Now known: Solar system has 166 moons, one star, eight planets (added Uranus and Neptune), eight asteroids, and more than 100 Kuiper belt objects more than 300 km in diameter (smaller asteroids, comets, and meteoroids) ...
Chapter 6
... Now known: Solar system has 166 moons, one star, eight planets (added Uranus and Neptune), eight asteroids, and more than 100 Kuiper belt objects more than 300 km in diameter (smaller asteroids, comets, and meteoroids) ...
... Now known: Solar system has 166 moons, one star, eight planets (added Uranus and Neptune), eight asteroids, and more than 100 Kuiper belt objects more than 300 km in diameter (smaller asteroids, comets, and meteoroids) ...
Chapter 10
... • Radioactive material in chondrules allows dating back to when they first condensed from the solar nebula • Some chondrules contain ancient dust grains that have survived from before the Solar System’s birth! ...
... • Radioactive material in chondrules allows dating back to when they first condensed from the solar nebula • Some chondrules contain ancient dust grains that have survived from before the Solar System’s birth! ...
origin of the solar system - Breakthrough Science Society
... only as the square root of the distance, a given mass contributes more angular momentum if it is placed at a greater distance from the sun. Jupiter, with its great mass, The initial ‘clues’ was found to carry about 60% of the enTycho Brahe, Kepler, and other as- tire angular momentum of the solar sy ...
... only as the square root of the distance, a given mass contributes more angular momentum if it is placed at a greater distance from the sun. Jupiter, with its great mass, The initial ‘clues’ was found to carry about 60% of the enTycho Brahe, Kepler, and other as- tire angular momentum of the solar sy ...
Extrasolar planets Topics to be covered Planets and brown dwarfs
... Additional problem: why do the planets stop their migration before falling into the star? ...
... Additional problem: why do the planets stop their migration before falling into the star? ...
Proposal submitted to ISSI
... accretion shock where matter is falling down onto the protostellar surface. Average densities in observed young disks are quite often higher than 106 cm-3, which are typical number densities for planetary exospheres. Although the time scales for their dispersal is quite uncertain, most young stars w ...
... accretion shock where matter is falling down onto the protostellar surface. Average densities in observed young disks are quite often higher than 106 cm-3, which are typical number densities for planetary exospheres. Although the time scales for their dispersal is quite uncertain, most young stars w ...
asteroid
... extends from the Kuiper Belt to almost halfway to the nearest star, and that contains billions of comets • Scientists think that most comets originate in the Oort cloud. • Bodies within the Oort cloud circle the sun so slowly that they take a few million years to complete one orbit. But, the gravity ...
... extends from the Kuiper Belt to almost halfway to the nearest star, and that contains billions of comets • Scientists think that most comets originate in the Oort cloud. • Bodies within the Oort cloud circle the sun so slowly that they take a few million years to complete one orbit. But, the gravity ...
Planets of Our, and Other, Solar Systems
... • The “Slow” scenario: the “seeds” of planet formation are dust grains, into dust bunnies, growing until large enough to be self-gravitating (about ½ mile across) and accelerate growth. Beyond “frost line”, “seeds” would be ices (hydrogen compounds with low melting points). Since H dominates mass, t ...
... • The “Slow” scenario: the “seeds” of planet formation are dust grains, into dust bunnies, growing until large enough to be self-gravitating (about ½ mile across) and accelerate growth. Beyond “frost line”, “seeds” would be ices (hydrogen compounds with low melting points). Since H dominates mass, t ...
arXiv:1404.0641v2 [astro
... would be possibly marginally sufficient for developing the simplest prokaryote — are interesting, otherwise they hardly can reveal well-developed atmospheres abundant in products of photosynthetic processes, such as carbon dioxide and oxygen. Moreover, though atmospheric oxygen appeared up at the Ea ...
... would be possibly marginally sufficient for developing the simplest prokaryote — are interesting, otherwise they hardly can reveal well-developed atmospheres abundant in products of photosynthetic processes, such as carbon dioxide and oxygen. Moreover, though atmospheric oxygen appeared up at the Ea ...
ph507lecnote07
... Beta Pictorisecame a surrounding outer disk of material and an inner "clear" zone about the size of our solar system. Strong evidence for the formation of planets. Beta Pictoris is 50 light years away and any orbiting planets are too small and faint to image at that distance. Shown here in false col ...
... Beta Pictorisecame a surrounding outer disk of material and an inner "clear" zone about the size of our solar system. Strong evidence for the formation of planets. Beta Pictoris is 50 light years away and any orbiting planets are too small and faint to image at that distance. Shown here in false col ...
Wide-eyed Telescope Finds its First Transiting
... attached to a conventional telescope mount. SuperWASP has a field-of-view some 2000 times greater than a conventional astronomical telescope. The instruments run under robotic control and are housed in their own customised building. The eight individual cameras on each mount are small by telescope s ...
... attached to a conventional telescope mount. SuperWASP has a field-of-view some 2000 times greater than a conventional astronomical telescope. The instruments run under robotic control and are housed in their own customised building. The eight individual cameras on each mount are small by telescope s ...
Wide-eyed Telescope Finds its First Transiting
... attached to a conventional telescope mount. SuperWASP has a field-of-view some 2000 times greater than a conventional astronomical telescope. The instruments run under robotic control and are housed in their own customised building. The eight individual cameras on each mount are small by telescope s ...
... attached to a conventional telescope mount. SuperWASP has a field-of-view some 2000 times greater than a conventional astronomical telescope. The instruments run under robotic control and are housed in their own customised building. The eight individual cameras on each mount are small by telescope s ...
5 Habitable zones and Planetary atmospheres
... planetary environment (atmosphere, etc.) A circumstellar habitable zone is defined as encompassing the range of distances from a star for which liquid water can exist on a planetary surface. Pure water exists as a liquid between 273 K and 373 K, unless the pressure is too low. Therefore, the prima ...
... planetary environment (atmosphere, etc.) A circumstellar habitable zone is defined as encompassing the range of distances from a star for which liquid water can exist on a planetary surface. Pure water exists as a liquid between 273 K and 373 K, unless the pressure is too low. Therefore, the prima ...
A Triple Conjunction
... A theory which has been popular for many years is that the Star of Bethlehem was a comet. There is no doubt that a bright comet is a very spectacular event and would be an impressive “star”, but scrutiny of the Chinese and Babylonian chronicles reveals no evidence of a bright comet. There is an even ...
... A theory which has been popular for many years is that the Star of Bethlehem was a comet. There is no doubt that a bright comet is a very spectacular event and would be an impressive “star”, but scrutiny of the Chinese and Babylonian chronicles reveals no evidence of a bright comet. There is an even ...
The formation of stars and planets
... • One obtains a 2-D problem (instead of 3-D) and higher capture chances. • Can increase formation speed by a factor of 10 or more. Is even effective if only 1% of planetesimals is small enough for shear-dominated regime ...
... • One obtains a 2-D problem (instead of 3-D) and higher capture chances. • Can increase formation speed by a factor of 10 or more. Is even effective if only 1% of planetesimals is small enough for shear-dominated regime ...
Habitable worlds with JWST: transit spectroscopy of the TRAPPIST
... TRAPPIST-1d may have a closer and shorter orbit. If, for example, the orbit is 10 days, the problem becomes more tractable, with 30 transits each with NIRSpec and MIRI observable within 6 years. The transit duration will decrease slightly, and this will increase the noise level on the spectrum, but ...
... TRAPPIST-1d may have a closer and shorter orbit. If, for example, the orbit is 10 days, the problem becomes more tractable, with 30 transits each with NIRSpec and MIRI observable within 6 years. The transit duration will decrease slightly, and this will increase the noise level on the spectrum, but ...
Survey of the Solar System
... Components of the Solar System Age of the Solar System All objects in the Solar System seem to have formed at nearly the same time Radioactive dating of rocks from the Earth, Moon, and some asteroids suggests an age of about 4.5 billion yrs A similar age is found for the Sun based on curren ...
... Components of the Solar System Age of the Solar System All objects in the Solar System seem to have formed at nearly the same time Radioactive dating of rocks from the Earth, Moon, and some asteroids suggests an age of about 4.5 billion yrs A similar age is found for the Sun based on curren ...
How fast do stars form out of the ISM?
... Let's consider the gravitational collapse of a cloud into globules and further into a proto-star. The molecular clouds are very dark because they are cold (~10-40 K) and dense (~1000 grains per centimeter cubed). Gravity is an attractive force between any two masses (the same way as the electromagne ...
... Let's consider the gravitational collapse of a cloud into globules and further into a proto-star. The molecular clouds are very dark because they are cold (~10-40 K) and dense (~1000 grains per centimeter cubed). Gravity is an attractive force between any two masses (the same way as the electromagne ...
From Dust to Planets - International Space Science Institute
... mass of typical proto-planetary disk within the orbit of the closest objects observed would not amount to a jupiter mass by a large factor even assuming 100 % efficiency in collecting the matter. Second, even if there was sufficient mass available, the young 51 Peg B for example would be torn apart ...
... mass of typical proto-planetary disk within the orbit of the closest objects observed would not amount to a jupiter mass by a large factor even assuming 100 % efficiency in collecting the matter. Second, even if there was sufficient mass available, the young 51 Peg B for example would be torn apart ...
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
Discovery of the Kuiper Belt
... inverse 4th power of the distance. A given body at 10 AU (an AU is the distance between the Earth and the Sun) will appear 10,000 times fainter than it would at 1 AU. Objects could exist out there, but be so faint as to have escaped detection. Eventually, I also realized that I could test these two ...
... inverse 4th power of the distance. A given body at 10 AU (an AU is the distance between the Earth and the Sun) will appear 10,000 times fainter than it would at 1 AU. Objects could exist out there, but be so faint as to have escaped detection. Eventually, I also realized that I could test these two ...