Signatures of Planets in Protoplanetary and Debris
... We perform further simulations with the goal of answering the question whether the planet itself and/or the circumplanetary environment heated by the planet, through its contraction and/or via accretion onto it, could be detected. The detection of a gap would already represent a strong indication of ...
... We perform further simulations with the goal of answering the question whether the planet itself and/or the circumplanetary environment heated by the planet, through its contraction and/or via accretion onto it, could be detected. The detection of a gap would already represent a strong indication of ...
Introduction - Gettysburg College
... Drawing a map of the universe is not an easy task. Understanding why it is difficult, however, is rather simple. Consider how hard it is to determine the shape and size of a forest when standing inside it. Trees are visible in all directions, but how far do they extend? Where are the boundaries of t ...
... Drawing a map of the universe is not an easy task. Understanding why it is difficult, however, is rather simple. Consider how hard it is to determine the shape and size of a forest when standing inside it. Trees are visible in all directions, but how far do they extend? Where are the boundaries of t ...
Millisecond Pulsar Binaries at Transition
... angular momentum and rotation is spun up to millisecond periods: accretion-powered MSPs • At some point, mass transfer in such a LMXB stops, and the neutron star can re-appear as a so-called black widow pulsar ...
... angular momentum and rotation is spun up to millisecond periods: accretion-powered MSPs • At some point, mass transfer in such a LMXB stops, and the neutron star can re-appear as a so-called black widow pulsar ...
Near-Earth Asteroid Search Programs
... the available technology in a very clever way. They developed a drift-scan technique where the readout rate was clocked to the sidereal drift rate across the CCD. The long scans produced images with minimal pixel-to-pixel (flatfield) variation, and readout overhead was limited to rampup and ramp-dow ...
... the available technology in a very clever way. They developed a drift-scan technique where the readout rate was clocked to the sidereal drift rate across the CCD. The long scans produced images with minimal pixel-to-pixel (flatfield) variation, and readout overhead was limited to rampup and ramp-dow ...
Introduction to Galaxies - West Jefferson Local Schools
... - galaxies contain varying amounts of disk component from mostly bulge with barely detectable disks to those totally dominated by their disks ...
... - galaxies contain varying amounts of disk component from mostly bulge with barely detectable disks to those totally dominated by their disks ...
BBC NEWS 15 July 2015 PLUTO: What jhave we learnt so far? Now
... is all in one piece, researchers can look forward to a "waterfall" of images and data from the strange, distant world over the next 16 months. But even though just a couple of pictures from the dwarf planet have been released so far, scientists are learning more from these than they have in years of ...
... is all in one piece, researchers can look forward to a "waterfall" of images and data from the strange, distant world over the next 16 months. But even though just a couple of pictures from the dwarf planet have been released so far, scientists are learning more from these than they have in years of ...
Edwin Hubble (1889
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
Abstract: Circumstellar Disk Modeling with Bayesian Statistics
... Young stars are the primary locations for circumstellar disks. As a protostar collapses during star formation, residual dust from the molecular cloud is pulled in gravitationally, while angular momentum causes it to flatten into a Keplerian, orbiting disk. By the time the disk becomes optically thin ...
... Young stars are the primary locations for circumstellar disks. As a protostar collapses during star formation, residual dust from the molecular cloud is pulled in gravitationally, while angular momentum causes it to flatten into a Keplerian, orbiting disk. By the time the disk becomes optically thin ...
CHIRON – A Fiber Fed Spectrometer for Precise Radial Velocities
... to ±0.2◦ . Stable illumination is provided by an octagonal multimode fiber with excellent lightscrambling properties. An iodine cell is used for wavelength calibration. We describe the main optics, fiber feed, detector, exposure-meter, and other aspects of the instrument, as well as the observing pr ...
... to ±0.2◦ . Stable illumination is provided by an octagonal multimode fiber with excellent lightscrambling properties. An iodine cell is used for wavelength calibration. We describe the main optics, fiber feed, detector, exposure-meter, and other aspects of the instrument, as well as the observing pr ...
SPIE 2016-Gressler-Telescope-Status_SPIE Submittal
... components. Assembly and test of the hexapod actuators and rotator will be done in CA, with full system testing (including 200% proof loading via surrogate masses) in their Golden, CO facility which provides the necessary high bay area. Detailed testing plans and procedures have been developed and a ...
... components. Assembly and test of the hexapod actuators and rotator will be done in CA, with full system testing (including 200% proof loading via surrogate masses) in their Golden, CO facility which provides the necessary high bay area. Detailed testing plans and procedures have been developed and a ...
the magellanic clouds newsletter - Keele University Astrophysics
... data from the OGLE III photometric catalogue. To determine age of the Pop I Cepheids, we derived a period–age (PA) relationship using the Cepheids found in the LMC star clusters. We find two peaks in the period distribution at log P = 0.49 ± 0.01 and log P = 0.28 ± 0.01 days which correspond to fund ...
... data from the OGLE III photometric catalogue. To determine age of the Pop I Cepheids, we derived a period–age (PA) relationship using the Cepheids found in the LMC star clusters. We find two peaks in the period distribution at log P = 0.49 ± 0.01 and log P = 0.28 ± 0.01 days which correspond to fund ...
nexstar_gt_60,80114.. - Downloads
... location entered. Press INFO to read information about the object displayed. Press the DOWN scroll key to display the next object. Press ENTER to slew to (go to) the displayed object. ...
... location entered. Press INFO to read information about the object displayed. Press the DOWN scroll key to display the next object. Press ENTER to slew to (go to) the displayed object. ...
Elliptical Galaxies
... •similar in form to globular clusters (i.e. nearly spherical) •little gas and dust -- no disk -- little or no star formation •little or no rotation •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant ...
... •similar in form to globular clusters (i.e. nearly spherical) •little gas and dust -- no disk -- little or no star formation •little or no rotation •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant ...
Finding habitable earths around white dwarfs with a robotic
... • If the white dwarf progenitor has a planetary system at large enough semi-major axis to survive the asymptotic-giant phase and has a companion star, the mass loss of the progenitor will modify the orbital elements of the binary, possibly resulting in instability of the planetary system, in some ca ...
... • If the white dwarf progenitor has a planetary system at large enough semi-major axis to survive the asymptotic-giant phase and has a companion star, the mass loss of the progenitor will modify the orbital elements of the binary, possibly resulting in instability of the planetary system, in some ca ...
Strong linear polarization of V4332 Sagittarii: a dusty disc geometry⋆
... This implies that the image of the object should display a dark lane across the image, as it observed e.g. in Gomez’s Humburger. In November 1997 an image of V4332 Sgr was taken by HST (briefly discussed in Kimeswenger 2006). No dark lane is seen but the image profile is not significantly different f ...
... This implies that the image of the object should display a dark lane across the image, as it observed e.g. in Gomez’s Humburger. In November 1997 an image of V4332 Sgr was taken by HST (briefly discussed in Kimeswenger 2006). No dark lane is seen but the image profile is not significantly different f ...
PDF
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
The Formation and Evolution of the Milky Way
... of about -4.0, or about 10,000 times less than the Sun! That it happens to be an ancient star is not a coincidence. When it was born the stellar chemical factories were only just beginning to start operation, so there was simply not a great abundance of metals that could be incorporated into the sta ...
... of about -4.0, or about 10,000 times less than the Sun! That it happens to be an ancient star is not a coincidence. When it was born the stellar chemical factories were only just beginning to start operation, so there was simply not a great abundance of metals that could be incorporated into the sta ...
Finnish Centre for Astronomy with ESO
... Special Unit of the University of Turku, and funded by the Ministry of Education and Culture, and by the participating universities (Aalto, Helsinki, Oulu and Turku). The highest decision-making body is the Board, chaired by Vice Rector Kalle-Antti Suominen of the University of Turku, and comprising ...
... Special Unit of the University of Turku, and funded by the Ministry of Education and Culture, and by the participating universities (Aalto, Helsinki, Oulu and Turku). The highest decision-making body is the Board, chaired by Vice Rector Kalle-Antti Suominen of the University of Turku, and comprising ...
The Physics of Star Formation: Understanding the Youngest Protostars
... The Physics of Star Formation: Understanding the Youngest Protostars region as a result of re-processing of shorter wavelength radiation by grains in their extended protostellar envelopes. The sub-mm spectra of these objects are feature-less and similar to blackbodies T ' 20 { 30 K (see Figure 1) an ...
... The Physics of Star Formation: Understanding the Youngest Protostars region as a result of re-processing of shorter wavelength radiation by grains in their extended protostellar envelopes. The sub-mm spectra of these objects are feature-less and similar to blackbodies T ' 20 { 30 K (see Figure 1) an ...
Our galaxy - School of Physics
... • The story of how we found out the shape of the Galaxy is told in a lovely book, “Minding the Heavens: The Story of our Discovery of the Milky Way” by Leila Belkora (IoP, 2003). • The website of the UCLA Galactic Centre group is at http://www.galacticcenter.astro.ucla.edu/. It contains lots of inte ...
... • The story of how we found out the shape of the Galaxy is told in a lovely book, “Minding the Heavens: The Story of our Discovery of the Milky Way” by Leila Belkora (IoP, 2003). • The website of the UCLA Galactic Centre group is at http://www.galacticcenter.astro.ucla.edu/. It contains lots of inte ...
Alignment Troubleshooting Alignment Procedure
... • Be sure to level the tripod before you begin alignment. The time/site information along with a level tripod will help the telescope better predict the available bright stars and planets that are above the horizon. • Remember to select alignment stars that are as far apart in the sky as possible. F ...
... • Be sure to level the tripod before you begin alignment. The time/site information along with a level tripod will help the telescope better predict the available bright stars and planets that are above the horizon. • Remember to select alignment stars that are as far apart in the sky as possible. F ...
X-Ray Telescopes
... Imaging observations enable deeper study of extended cosmic x-ray sources. Imaging of CLUSTERS OF GALAXIES reveals details of the intracluster gas temperature profile and isolates the x-ray emission from component galaxies. Imaging of GALAXIES allows study of any central source as well as the identi ...
... Imaging observations enable deeper study of extended cosmic x-ray sources. Imaging of CLUSTERS OF GALAXIES reveals details of the intracluster gas temperature profile and isolates the x-ray emission from component galaxies. Imaging of GALAXIES allows study of any central source as well as the identi ...
Annual report 2002 - Département d`Astrophysique, Géophysique et
... mode identification with a photometric identification based upon a non-adiabatic description of the eigenfunctions in the star atmosphere. Numerous theoretical models have been computed in order to select the model best fitting the observed frequency values as well as the mode identifications. The d ...
... mode identification with a photometric identification based upon a non-adiabatic description of the eigenfunctions in the star atmosphere. Numerous theoretical models have been computed in order to select the model best fitting the observed frequency values as well as the mode identifications. The d ...
Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments are no longer usable. However, the two shortest-wavelength modules of the IRAC camera are still operable with the same sensitivity as before the cryogen was exhausted, and will continue to be used in the Spitzer Warm Mission. All Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).In keeping with NASA tradition, the telescope was renamed after its successful demonstration of operation, on 18 December 2003. Unlike most telescopes that are named after famous deceased astronomers by a board of scientists, the new name for SIRTF was obtained from a contest open to the general public.The contest led to the telescope being named in honor of astronomer Lyman Spitzer, who had promoted the concept of space telescopes in the 1940s. Spitzer wrote a 1946 report for RAND Corporation describing the advantages of an extraterrestrial observatory and how it could be realized with available or upcoming technology. He has been cited for his pioneering contributions to rocketry and astronomy, as well as ""his vision and leadership in articulating the advantages and benefits to be realized from the Space Telescope Program.""The US$800 million Spitzer was launched from Cape Canaveral Air Force Station, on a Delta II 7920H ELV rocket, Monday, 25 August 2003 at 13:35:39 UTC-5 (EDT).It follows a heliocentric instead of geocentric orbit, trailing and drifting away from Earth's orbit at approximately 0.1 astronomical unit per year (a so-called ""earth-trailing"" orbit). The primary mirror is 85 centimeters (33 in) in diameter, f/12, made of beryllium and is cooled to 5.5 K (−449.77 °F). The satellite contains three instruments that allow it to perform astronomical imaging and photometry from 3 to 180 micrometers, spectroscopy from 5 to 40 micrometers, and spectrophotometry from 5 to 100 micrometers.