Living with a Red Dwarf - Center for Space and Habitability (CSH)
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
Gaia talk
... 100Tb raw compressed data – our database is 15Tb as of today 2 telescopes, 35m focal length, rectangular mirrors 3.5M hours of work to study, design & build = 300people x 7 years 400 scientists working on data processing Over 30,000 mission documents in archive Launch burned 225tonnes of kerosene+ox ...
... 100Tb raw compressed data – our database is 15Tb as of today 2 telescopes, 35m focal length, rectangular mirrors 3.5M hours of work to study, design & build = 300people x 7 years 400 scientists working on data processing Over 30,000 mission documents in archive Launch burned 225tonnes of kerosene+ox ...
Can TMT Image Habitable Planets ?
... [2] Low latency WFC System lag is extremely problematic → creates “ghost” slow speckles that last crossing time Need ~200us latency (10 kHz system, or slower system + lag compensation), or multiple loops ...
... [2] Low latency WFC System lag is extremely problematic → creates “ghost” slow speckles that last crossing time Need ~200us latency (10 kHz system, or slower system + lag compensation), or multiple loops ...
The Distances to the Stars
... At the end of the semester you will approach this goal and measure the distances to remote galaxies. However, the journey begins here with the measurement of the distances between the Sun and the very nearest stars. For all of its cosmic grandeur, the measurement of the distances to stars is founded ...
... At the end of the semester you will approach this goal and measure the distances to remote galaxies. However, the journey begins here with the measurement of the distances between the Sun and the very nearest stars. For all of its cosmic grandeur, the measurement of the distances to stars is founded ...
Stellar Masses
... demonstrated that this object must be a very nearby dwarf (cesium is not detected in giants), with a temperature of about 2200 K and a mass between 90 and 60 Jupiters. The lack of lithium implies that the mass must be larger than 60 Jupiter masses, but does not rule out that it could be a massive br ...
... demonstrated that this object must be a very nearby dwarf (cesium is not detected in giants), with a temperature of about 2200 K and a mass between 90 and 60 Jupiters. The lack of lithium implies that the mass must be larger than 60 Jupiter masses, but does not rule out that it could be a massive br ...
No Slide Title
... • describe the formation of the extra-solar planets: • Planets form from dust which agglomerates into cores which then accrete gas from a disc. • A gravitational instability in a protostellar disc creates a number of giant planets. • Both models have trouble reproducing both the observed distributio ...
... • describe the formation of the extra-solar planets: • Planets form from dust which agglomerates into cores which then accrete gas from a disc. • A gravitational instability in a protostellar disc creates a number of giant planets. • Both models have trouble reproducing both the observed distributio ...
Ch17_Galaxies
... Dark Matter • The amount of matter needed to resolve this discrepancy is as much as 10× the visible mass • The strongest evidence that dark matter exists comes from galaxy rotation curves, which do not show diminishing speeds at large distances from the galaxy’s center ...
... Dark Matter • The amount of matter needed to resolve this discrepancy is as much as 10× the visible mass • The strongest evidence that dark matter exists comes from galaxy rotation curves, which do not show diminishing speeds at large distances from the galaxy’s center ...
IAU-Perraut-2013 - Putting A Stars into Context
... Science drivers A-F stars are an ideal laboratory for studying physical processes ...
... Science drivers A-F stars are an ideal laboratory for studying physical processes ...
Astronomy 112: The Physics of Stars Class 19 Notes: The Stellar
... older stellar population. Given a bunch of stars in an HR diagram this technique can get quite sophisticated. An example is a recent paper by Williams et al. that used this method to determine the star formation history in different parts of a nearby galaxy. They divided the galaxy into annuli, and ...
... older stellar population. Given a bunch of stars in an HR diagram this technique can get quite sophisticated. An example is a recent paper by Williams et al. that used this method to determine the star formation history in different parts of a nearby galaxy. They divided the galaxy into annuli, and ...
Prop 17 - WM Keck Observatory
... emission from spiders, secondary obscuration, and (3) evaluate the potential of coronagraphic instruments at Keck that look for exo-planets. Description (Please describe your night-time engineering plan; provide justification for the time request, and include figures, ECR description and other attac ...
... emission from spiders, secondary obscuration, and (3) evaluate the potential of coronagraphic instruments at Keck that look for exo-planets. Description (Please describe your night-time engineering plan; provide justification for the time request, and include figures, ECR description and other attac ...
Lecture 10 Spectra of Stars and Binaries
... • Two stars orbiZng nearly edge‐on. – See a periodic drop in brightness as one star eclipses the other. – Combine with spectra which measure orbital speeds. ...
... • Two stars orbiZng nearly edge‐on. – See a periodic drop in brightness as one star eclipses the other. – Combine with spectra which measure orbital speeds. ...
13_Testbank - Lick Observatory
... 7) What do astronomers mean by a "selection effect". Explain why the detection of giant planets in close orbits does not necessarily mean our Solar System is unusual. Answer: A selection effect is a bias in a detection technique. The technique is most sensitive to a certain class of objects and thes ...
... 7) What do astronomers mean by a "selection effect". Explain why the detection of giant planets in close orbits does not necessarily mean our Solar System is unusual. Answer: A selection effect is a bias in a detection technique. The technique is most sensitive to a certain class of objects and thes ...
powerpoint - High Energy Physics at Wayne State
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
Lecture 3 - University of Washington
... Theories of Spiral Structure Despite 50 years of work, spirals are not very well understood. It seems clear now that the spiral structure of galaxies is a complex problem without any unique and tidy answer. Differential rotation clearly plays a central role, as well as global instabilities, stochas ...
... Theories of Spiral Structure Despite 50 years of work, spirals are not very well understood. It seems clear now that the spiral structure of galaxies is a complex problem without any unique and tidy answer. Differential rotation clearly plays a central role, as well as global instabilities, stochas ...
Other Planetary Systems The New Science of Distant Worlds 13.1
... Answer: A selection effect is a bias in a detection technique. The technique is most sensitive to a certain class of objects and these kinds of objects therefore tend to be "selected". In the case of extrasolar planet detection, the indirect methods of detection rely on the gravity of the planet (Do ...
... Answer: A selection effect is a bias in a detection technique. The technique is most sensitive to a certain class of objects and these kinds of objects therefore tend to be "selected". In the case of extrasolar planet detection, the indirect methods of detection rely on the gravity of the planet (Do ...
8-4.9 - S2TEM Centers SC
... ecliptic, they are not normally in alignment with each other because their orbital velocities and orbital periods vary.) Planets cannot be seen with the naked eye. The earth is the center of the solar system. (The planets, sun and moon revolve around the earth.) The solar system contains only ...
... ecliptic, they are not normally in alignment with each other because their orbital velocities and orbital periods vary.) Planets cannot be seen with the naked eye. The earth is the center of the solar system. (The planets, sun and moon revolve around the earth.) The solar system contains only ...
The Sculptor dwarf irregular galaxy SDIG: present and past
... near-infrared (J andK) imaging at the Anglo-Australian Telescope (AAT). Despite the presence of many blue stars, there are at present no detectable H II regions, indicating that the galaxy is now in a relatively quiescent state. However, the ratio of the H I mass to blue luminosity is typical of oth ...
... near-infrared (J andK) imaging at the Anglo-Australian Telescope (AAT). Despite the presence of many blue stars, there are at present no detectable H II regions, indicating that the galaxy is now in a relatively quiescent state. However, the ratio of the H I mass to blue luminosity is typical of oth ...
Galaxies - University of Iowa Astrophysics
... Galactic center? D) We observe dusty regions in the Galactic plane. ...
... Galactic center? D) We observe dusty regions in the Galactic plane. ...
Star_Clusters
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
Star Clusters and their stars
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
... They typically have 105 – 106 stars. They are spherically distributed around the center of our Galaxy. They tend to concentrate towards the center of the Galaxy, with many in the constellations Sagittarius, Scorpio and Ophiunchus It was by studying the distribution of globular clusters that astronom ...
Chapter 26: Stars, Galaxies, and the Universe Stars
... distant stars. Then, they wait 6 months; during this time, Earth moves from one side of its orbit around the Sun to the other side. When they look at the star again, parallax will cause the star to appear in a different position relative to more distant stars. From the size of this shift, they can c ...
... distant stars. Then, they wait 6 months; during this time, Earth moves from one side of its orbit around the Sun to the other side. When they look at the star again, parallax will cause the star to appear in a different position relative to more distant stars. From the size of this shift, they can c ...
Effects of Mutual Transits by Extrasolar Planet
... Figure 1 shows light curves by mutual transits for two cases. One is the zero spin limit of ω → 0 as a reference. In this case, motion of the two objects is nothing but a translation. Because of the time lag between the first and second transits, a certain plateau appears in light curves. The other ...
... Figure 1 shows light curves by mutual transits for two cases. One is the zero spin limit of ω → 0 as a reference. In this case, motion of the two objects is nothing but a translation. Because of the time lag between the first and second transits, a certain plateau appears in light curves. The other ...
Dynamics of disks with planets
... discovered extrasolar planetary systems. The properties of these systems were unexpected. This motivated theorists to extend and revise many preexisting theories. Important extensions include migration of bodies and planetary eccentricity pumping by planet-planet interaction, and primordial disk-pla ...
... discovered extrasolar planetary systems. The properties of these systems were unexpected. This motivated theorists to extend and revise many preexisting theories. Important extensions include migration of bodies and planetary eccentricity pumping by planet-planet interaction, and primordial disk-pla ...
T
... design, construction, and pro- and a reference fibre, feed the spectrocurement of an instrument dedicated to graph with the light from the telescope and the search for extrasolar planets and aim- the calibration lamps. The fibres are reing at an unequalled precision of 1 m/s. In imaged by the spectr ...
... design, construction, and pro- and a reference fibre, feed the spectrocurement of an instrument dedicated to graph with the light from the telescope and the search for extrasolar planets and aim- the calibration lamps. The fibres are reing at an unequalled precision of 1 m/s. In imaged by the spectr ...
telescopes timeline - Institute of Astronomy
... telescope, with an aperture of 11.6 inches (28cms) and a length of 19ft 6in, was the largest refracting telescope in the world. Even when it was built however, there had been larger telescopes in existence and even larger ones planned. These were reflecting telescopes; by using a mirror rather than ...
... telescope, with an aperture of 11.6 inches (28cms) and a length of 19ft 6in, was the largest refracting telescope in the world. Even when it was built however, there had been larger telescopes in existence and even larger ones planned. These were reflecting telescopes; by using a mirror rather than ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.