Debris disks and the search for life in the universe Gianni Cataldi
... explorers of the old days that entered unknown areas to fill the empty space on their maps and discover new lands, plants, or animals. Similarly, astronomers try to map the universe and gather information about it, the big difference being of course that astronomy is dependent on remote observations ...
... explorers of the old days that entered unknown areas to fill the empty space on their maps and discover new lands, plants, or animals. Similarly, astronomers try to map the universe and gather information about it, the big difference being of course that astronomy is dependent on remote observations ...
Catch a Comet - Innovative Teachers BG
... system. It is said, that tails are nothing visible, but they can be watched because of the illumination of the gas and dust. The illumination is connected with the ionization of the gas by the ultraviolet rays thrown out of the Sun surface. And dust just disperse the sunlight. The tails are brightes ...
... system. It is said, that tails are nothing visible, but they can be watched because of the illumination of the gas and dust. The illumination is connected with the ionization of the gas by the ultraviolet rays thrown out of the Sun surface. And dust just disperse the sunlight. The tails are brightes ...
Evolution of Circumstellar Disks Around Normal Stars
... that 10–20 % (5/33) of Milky Way G stars, regardless of their age, have debris disks, comparable to results obtained previously for A stars (Lagrange et al., 2000). Recent work with the Spitzer Space Telescope offers a new perspective. From the FEPS program, surveys for cold debris disks surrounding ...
... that 10–20 % (5/33) of Milky Way G stars, regardless of their age, have debris disks, comparable to results obtained previously for A stars (Lagrange et al., 2000). Recent work with the Spitzer Space Telescope offers a new perspective. From the FEPS program, surveys for cold debris disks surrounding ...
Compartive Planetology I: Our Solar. System
... An attempt to land a spacecraft on the surface of any of the Jo vian planets would be futile, because the materials of which these planets are made are mostly gaseous or liquid. The visible “surface” features of a Jovian planet are actually cloud forma— tions in the planet’s atmosphere. The photogra ...
... An attempt to land a spacecraft on the surface of any of the Jo vian planets would be futile, because the materials of which these planets are made are mostly gaseous or liquid. The visible “surface” features of a Jovian planet are actually cloud forma— tions in the planet’s atmosphere. The photogra ...
ppt cometison deka eyesonison large
... Comet ISON — officially designated C/2012 S1 — may become one of the most dazzling shows in decades when it nears our sun later this year. Like all comets, ISON is a clump of frozen gases mixed with dust. Often described as “dirty snowballs,” comets emit gas and dust whenever they venture near en ...
... Comet ISON — officially designated C/2012 S1 — may become one of the most dazzling shows in decades when it nears our sun later this year. Like all comets, ISON is a clump of frozen gases mixed with dust. Often described as “dirty snowballs,” comets emit gas and dust whenever they venture near en ...
astro-ph/0303282 PDF
... planet detection. At 3.3 pc, it is one of the closest stars to Earth. Eps Eri is thought to have a relatively young age of ~730 Myr (Song et al. 2000), and has a mass similar to that of our sun. There is also tentative radial-velocity evidence for a companion in an a=3.4 AU orbit (Hatzes et al. 2000 ...
... planet detection. At 3.3 pc, it is one of the closest stars to Earth. Eps Eri is thought to have a relatively young age of ~730 Myr (Song et al. 2000), and has a mass similar to that of our sun. There is also tentative radial-velocity evidence for a companion in an a=3.4 AU orbit (Hatzes et al. 2000 ...
Solar System Deuterium/Hydrogen Ratio
... forward to reverse reaction rate ratio; i.e., fequi = kf /kr. fequi depends exclusively on the temperature (Richet et al., 1977). In the geochemical literature fequi is often noted as α(T) and is referred to as “the isotopic fractionation factor.” Reaction (1) can be extended to all kinds of H-beari ...
... forward to reverse reaction rate ratio; i.e., fequi = kf /kr. fequi depends exclusively on the temperature (Richet et al., 1977). In the geochemical literature fequi is often noted as α(T) and is referred to as “the isotopic fractionation factor.” Reaction (1) can be extended to all kinds of H-beari ...
Behaviour of elements from lithium to europium in stars with and
... value [Fe/H] was the iron abundance obtained from the Fe I lines under the local thermodynamic equilibrium (LTE) approximation. We note that the non-LTE corrections for the range of temperatures and metallicities of our target stars do not exceed 0.1 dex (Mashonkina et al. 2011). In our previous pap ...
... value [Fe/H] was the iron abundance obtained from the Fe I lines under the local thermodynamic equilibrium (LTE) approximation. We note that the non-LTE corrections for the range of temperatures and metallicities of our target stars do not exceed 0.1 dex (Mashonkina et al. 2011). In our previous pap ...
Disentangling degenerate solutions from primary transit and
... 209458b’s passage behind its star during secondary eclipse. The planet plus star’s 4.5 [5] and 8 µm [6] emissions were compared with those of the star alone, yielding a brightness temperature close to the current excepted value of 1130 K [7]. Observations of exoplanetary transmission and emission sp ...
... 209458b’s passage behind its star during secondary eclipse. The planet plus star’s 4.5 [5] and 8 µm [6] emissions were compared with those of the star alone, yielding a brightness temperature close to the current excepted value of 1130 K [7]. Observations of exoplanetary transmission and emission sp ...
THE VELOCITY DISTRIBUTION OF THE NEAREST
... unsuitable since they vary between species. Note that since we are interested in the distribution of the deviation of component velocities in the rest frame of V flow , the component data set includes all measured components for each star. We find that this procedure yields a predicted flow velocity V ...
... unsuitable since they vary between species. Note that since we are interested in the distribution of the deviation of component velocities in the rest frame of V flow , the component data set includes all measured components for each star. We find that this procedure yields a predicted flow velocity V ...
- ANU Repository
... the previously confirmed Kepler-45b. There is suggestive but not significant evidence that the radius distribution varies with orbital period. The distribution with logarithmic orbital period is flat except for a decline for orbits less than a few days. 12 candidate planets, including two Jupiter-size ...
... the previously confirmed Kepler-45b. There is suggestive but not significant evidence that the radius distribution varies with orbital period. The distribution with logarithmic orbital period is flat except for a decline for orbits less than a few days. 12 candidate planets, including two Jupiter-size ...
Comets, historical records and vedic literature
... this word connoted a comet (Iyengar, 2010) more than 3000 years ago. It is to be noted that the mantra portions of Atharvaveda have been dated to about 1150 BC because of their first direct mention of metal iron (Witzel, 1995). Ketus (in plural), meaning rays of light or fire-smoke combine, have als ...
... this word connoted a comet (Iyengar, 2010) more than 3000 years ago. It is to be noted that the mantra portions of Atharvaveda have been dated to about 1150 BC because of their first direct mention of metal iron (Witzel, 1995). Ketus (in plural), meaning rays of light or fire-smoke combine, have als ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... same data to be drawn more than once. For example, the uncertainty in a quantity derived for a cloud containing 500 (x, y, v, t) pixels can be estimated by drawing 500 pixels randomly from the set. If each pixel is chosen exactly once, then we have the initial (observed) cloud property. Since this i ...
... same data to be drawn more than once. For example, the uncertainty in a quantity derived for a cloud containing 500 (x, y, v, t) pixels can be estimated by drawing 500 pixels randomly from the set. If each pixel is chosen exactly once, then we have the initial (observed) cloud property. Since this i ...
PPT Version
... tectonic plates has increased the unseal thermal updrafts and jet stream moving oxygen molecules higher to be bombarded by incoming ionising particles (not a good result for the oxygen [which gives up an electron occasionally], nor us – that need that oxygen to not be alchemised into something unbre ...
... tectonic plates has increased the unseal thermal updrafts and jet stream moving oxygen molecules higher to be bombarded by incoming ionising particles (not a good result for the oxygen [which gives up an electron occasionally], nor us – that need that oxygen to not be alchemised into something unbre ...
Rocky planetesimals as the origin of metals in DZ stars
... towards higher space velocities (Sion et al. 1988). Kilic & Redfield (2007) examined possible correlations between the current positions of 35 DAZ white dwarfs and models of the surrounding ISM as inferred from nearby column density measurements, finding a lack of sufficient material to account for ...
... towards higher space velocities (Sion et al. 1988). Kilic & Redfield (2007) examined possible correlations between the current positions of 35 DAZ white dwarfs and models of the surrounding ISM as inferred from nearby column density measurements, finding a lack of sufficient material to account for ...
8 Comets: Potential Sources of Prebiotic Molecules for the
... P/Churyumov-Gerasimenko is an antitail (Weiler et al., 2004). Cometary dust particles disperse more or less rapidly into the interplanetary space, according to their shape, nature and initial velocity. Some of them cross the path of the Earth; if large enough they produce meteors. One can get an ide ...
... P/Churyumov-Gerasimenko is an antitail (Weiler et al., 2004). Cometary dust particles disperse more or less rapidly into the interplanetary space, according to their shape, nature and initial velocity. Some of them cross the path of the Earth; if large enough they produce meteors. One can get an ide ...
Sample pages 1 PDF
... designations that have mostly been replaced by a collective term C, or “carbon stars.” Such stars have an abundance of carbon or oxygen in their photospheres, as there is an exchange of material between the core and the photospheres in such stars due to the nature of their convective cores. Some AGB ...
... designations that have mostly been replaced by a collective term C, or “carbon stars.” Such stars have an abundance of carbon or oxygen in their photospheres, as there is an exchange of material between the core and the photospheres in such stars due to the nature of their convective cores. Some AGB ...
Looking for planets with SPHERE in planetary systems with double
... significant fraction of main-sequence stars older than about 10 Myr. Since the circumstellar dust is short-lived, the very existence of these disks is considered as an evidence that dust-producing planetesimals are still present in mature systems, in which planets have formed- or failed to form- a l ...
... significant fraction of main-sequence stars older than about 10 Myr. Since the circumstellar dust is short-lived, the very existence of these disks is considered as an evidence that dust-producing planetesimals are still present in mature systems, in which planets have formed- or failed to form- a l ...
Solar System
... If the Sun–Neptune distance is scaled to 100 metres, then the Sun would be about 3 cm in diameter (roughly twothirds the diameter of a golf ball), the giant planets would be all smaller than about 3 mm, and Earth’s diameter along with that of the other terrestrial planets would be smaller than a flea ...
... If the Sun–Neptune distance is scaled to 100 metres, then the Sun would be about 3 cm in diameter (roughly twothirds the diameter of a golf ball), the giant planets would be all smaller than about 3 mm, and Earth’s diameter along with that of the other terrestrial planets would be smaller than a flea ...
Star Formation in the Galaxy, An Observational Overview
... Given that stars form in dense gas, it is perhaps not surprising that most stars have been found to form in embedded clusters (Lada et al 1991; Carpenter 2000; Lada & Lada 2003, Porras et al. 2004), since the mass spectrum of dense cores indicates that most of the dense gas is found in the most mass ...
... Given that stars form in dense gas, it is perhaps not surprising that most stars have been found to form in embedded clusters (Lada et al 1991; Carpenter 2000; Lada & Lada 2003, Porras et al. 2004), since the mass spectrum of dense cores indicates that most of the dense gas is found in the most mass ...
Astronomical Circumstances
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
21 -26 August University of Exeter
... Stars form within molecular clouds, which are formed as a result of the interchange and evolution of gas through a wide range of densities and scales. Therefore, to understand the global processes that lead to star formation, it is crucial to understand the hierarchical organisation of the molecular ...
... Stars form within molecular clouds, which are formed as a result of the interchange and evolution of gas through a wide range of densities and scales. Therefore, to understand the global processes that lead to star formation, it is crucial to understand the hierarchical organisation of the molecular ...
our knowledge of high-mass star formation at the dawn of - CEA-Irfu
... high-mass star formation have been called massive starless or pre-stellar cores, massive cold molecular cores, or even infrared-dark clouds. In the subsequent phase, they have been named massive protostars, high-mass protostellar objects, or hot molecular cores. The better-known final phase would co ...
... high-mass star formation have been called massive starless or pre-stellar cores, massive cold molecular cores, or even infrared-dark clouds. In the subsequent phase, they have been named massive protostars, high-mass protostellar objects, or hot molecular cores. The better-known final phase would co ...
PTYS/ASTR 206
... with Neptune (3:2 resonance “Plutino”) • This is further complicated by the fact that the recently discovered Eris is larger than Pluto. • In 2006, Pluto was downgraded to a new class of objects called “dwarf planets” – But the debate rages on ...
... with Neptune (3:2 resonance “Plutino”) • This is further complicated by the fact that the recently discovered Eris is larger than Pluto. • In 2006, Pluto was downgraded to a new class of objects called “dwarf planets” – But the debate rages on ...
Planetesimal collisions in binary systems
... other parameters the same, a km-sized planetesimal will now undergo a collision every 10-20 orbits at 1 AU. If we take the binary companion to have a semi-major axis of 20 AU, this collision time scale amounts to 25 % of a binary orbit. This should be compared to the time scale for a particle to rea ...
... other parameters the same, a km-sized planetesimal will now undergo a collision every 10-20 orbits at 1 AU. If we take the binary companion to have a semi-major axis of 20 AU, this collision time scale amounts to 25 % of a binary orbit. This should be compared to the time scale for a particle to rea ...