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All posts; Tags Include "Theoretical Astrophysics"

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  • February 13, 2016
  • 05:02 AM
  • 1,080 views

Now we can hear the Universe

by TakFurTheKaffe in Tak Fur The Kaffe

The detection of gravitational waves produced by the collision of two black holes over 1 billion light years away confirms Einstein's vision of our Universe.... Read more »

Abbott, B., Abbott, R., Abbott, T., Abernathy, M., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.... (2016) Observation of Gravitational Waves from a Binary Black Hole Merger. Physical Review Letters, 116(6). DOI: 10.1103/PhysRevLett.116.061102  

  • December 4, 2014
  • 02:21 PM
  • 1,432 views

ALMA Japan: Hi-Def Imaging of Spiral Gas Arms from Twin Baby Stars (w/video)

by DJ Busby in Astronasty

We know that about half the the stars out there (with sizes close to that of our sun) are binary systems. However, for a long time we've been lacking information on how they develop, since it's not been easy to get a whole lot of data from surrounding scattered mass that's so damned far away! Congrats to all involved!... Read more »

Shigehisa Takakuwa, Masao Saito, Kazuya Saigo, Tomoaki Matsumoto, Jeremy Lim, Tomoyuki Hanawa, & Paul T. P. Ho. (2014) Angular Momentum Exchange by Gravitational Torques and Infall in the Circumbinary Disk of the Protostellar System L1551 NE. The Astrophysical Journal. arXiv: 1409.4903v1

  • June 7, 2013
  • 03:18 PM
  • 1,368 views

The Halting of the Hot Jupiter

by Melissa Chernick in Science Storiented

We haven’t talked about exoplanets for a while, and we should ‘cause they are pretty badass. Through various podcasts and the like, I've been hearing some really cool things about NASA’s Kepler Mission and all of neat astronomical bodies it’s been finding. So I decided to browse around the NASA and JPL websites to see what new coolness has been discovered recently.NASA’s Kepler Mission was launched in 2009. It was built to detect potentially life-supporting planets around other stars........ Read more »

  • December 19, 2012
  • 06:00 PM
  • 1,487 views

what alcohol can tell us about the fate of the universe

by Greg Fish in weird things

Once upon a time, we looked at an explanation for dark matter involving a theory about how all matter around us could decay over 6.6 × 10^33 years and noted that there’s a controversy as to whether protons actually decay. To help settle this, astronomers took advantage of the fact that telescopes are relativistic time machines, and peered through them at a galaxy known as PKS 1830-211 — a name only a scientist could love — that just so happens to be a gravitational lens a........ Read more »

  • September 17, 2012
  • 01:27 AM
  • 1,598 views

What Microfossils Found in Meteorites Can Tell Us

by Jason Carr in Wired Cosmos

While most people associate the term microfossil with the strange ALH 84001 object, there are plenty of other more concrete examples of tiny fossilized organisms. Research conducted with scanning electron microscope equipment has created a wide array of scientific literature regarding these small remains of living organisms. While marine objects don’t necessary have anything to [...]... Read more »

  • May 8, 2012
  • 01:03 PM
  • 1,532 views

Looking for Earths by Looking for Jupiters

by Jason Carr in Wired Cosmos

In the search for Earth-like planets, it is helpful to look for clues and patterns that can help scientist narrow down the types of systems where potentially habitable planets are likely to be discovered. New research from a team including Carnegie’s Alan Boss narrows down the search for Earth-like planets near Jupiter-like planets. Their work [...]... Read more »

Steffen, J., Ragozzine, D., Fabrycky, D., Carter, J., Ford, E., Holman, M., Rowe, J., Welsh, W., Borucki, W., Boss, A.... (2012) Kepler constraints on planets near hot Jupiters. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1120970109  

  • April 17, 2012
  • 09:59 AM
  • 1,650 views

Magnetic Fields Can Send Particles to Infinity

by Jason Carr in Wired Cosmos

I’ve always thought that if we’re ever to achieve long-range intersteller space travel, magnetics will play a fairly large role in the process. This is especially true if we’re going to get away from the dependence of currently used rocket fuel in the process. I’m not quite certain of the physics/mechanics involved (yet) but surely [...]... Read more »

Díaz-Cano, A., & González-Gascón, F. (2012) Escape to infinity in the presence of magnetic fields. Quarterly of Applied Mathematics, 70(1), 45-51. DOI: 10.1090/S0033-569X-2011-01248-4  

  • April 13, 2012
  • 12:39 PM
  • 1,635 views

A New First – Uranus Auroras Glimpsed from Earth

by Jason Carr in Wired Cosmos

For the first time, scientists have captured images of auroras above the giant ice planet Uranus, finding further evidence of just how peculiar a world that distant planet is. Detected by means of carefully scheduled observations from the Hubble Space Telescope, the newly witnessed Uranian light show consisted of short-lived, faint, glowing dots – a [...]... Read more »

Lamy, L., Gladstone, G., Barthelemy, M., Achilleos, N., Guio, P., Dougherty, M., Melin, H., Cowley, S., Stallard, T., Nichols, J.... (2012) Earth-based detection of Uranus' aurorae. Geophysical Research Letters. DOI: 10.1029/2012GL051312  

  • April 12, 2012
  • 09:49 PM
  • 2,592 views

Disassociate Galaxy Clusters

by The Astronomist in The Astronomist.

A dissociative galaxy cluster is a cluster of galaxies that just can't keep it together any longer. This may sound like an unnecessary anthropomorphication of galaxies, but it is actually a description of galaxy clusters which have collided and experienced stratification of their constituent parts. In the standard and successful model of cosmology the largest scale structures in the universe, like super clusters of thousands of galaxies, form via the merger of filamentary structures compose........ Read more »

Dawson, W., Wittman, D., Jee, M., Gee, P., Hughes, J., Tyson, J., Schmidt, S., Thorman, P., Bradač, M., Miyazaki, S.... (2012) DISCOVERY OF A DISSOCIATIVE GALAXY CLUSTER MERGER WITH LARGE PHYSICAL SEPARATION. The Astrophysical Journal, 747(2). DOI: 10.1088/2041-8205/747/2/L42  

Jee, M., Mahdavi, A., Hoekstra, H., Babul, A., Dalcanton, J., Carroll, P., & Capak, P. (2012) A STUDY OF THE DARK CORE IN A520 WITH THE : THE MYSTERY DEEPENS . The Astrophysical Journal, 747(2), 96. DOI: 10.1088/0004-637X/747/2/96  

Markevitch, M., Gonzalez, A., Clowe, D., Vikhlinin, A., Forman, W., Jones, C., Murray, S., & Tucker, W. (2004) Direct Constraints on the Dark Matter Self‐Interaction Cross Section from the Merging Galaxy Cluster 1E 0657−56. The Astrophysical Journal, 606(2), 819-824. DOI: 10.1086/383178  

  • April 12, 2012
  • 02:00 PM
  • 1,566 views

Workings of Nearby Planetary System Revealed

by Jason Carr in Wired Cosmos

A new observatory still under construction has given astronomers a major breakthrough in understanding a nearby planetary system and provided valuable clues about how such systems form and evolve. Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have discovered that planets orbiting the star Fomalhaut must be much smaller than originally thought. This is the first [...]... Read more »

Aaron C. Boley, Matthew J. Payne, Stuartt Corder, William Dent, Eric B. Ford, & Megan Shabram. (2012) Constraining the Planetary System of Fomalhaut Using High-Resolution ALMA Observations. APJ Letters. arXiv: 1204.0007v1

  • April 12, 2012
  • 11:46 AM
  • 1,475 views

Discovery of the Musket Ball Cluster

by Jason Carr in Wired Cosmos

Using a combination of powerful observatories in space and on the ground, astronomers have observed a violent collision between two galaxy clusters in which so-called normal matter has been wrenched apart from dark matter through a violent collision between two galaxy clusters. The newly discovered galaxy cluster is called DLSCL J0916.2 2951 (referenced below). It is similar to the Bullet Cluster shown [...]... Read more »

William A. Dawson, David Wittman, Myungkook Jee, Perry Gee, John P. Hughes, J. Anthony Tyson, Samuel Schmidt, Paul Thorman, Marusa Bradac, Satoshi Miyazaki.... (2011) Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation. 2012 ApJ 747 L42. arXiv: 1110.4391v2

  • April 11, 2012
  • 04:37 PM
  • 1,522 views

Sandstorms in Space

by Jason Carr in Wired Cosmos

A team of researchers have used new techniques which allowed them to look into the atmospheres of distant, dying stars. The team, lead by Barnaby Norris from the University of Sydney in Australia, includes scientists from the Universities of Manchester, Paris-Diderot, Oxford and Macquarie University, New South Wales. They used the Very Large Telescope in [...]... Read more »

Norris, B., Tuthill, P., Ireland, M., Lacour, S., Zijlstra, A., Lykou, F., Evans, T., Stewart, P., & Bedding, T. (2012) A close halo of large transparent grains around extreme red giant stars. Nature, 484(7393), 220-222. DOI: 10.1038/nature10935  

  • April 11, 2012
  • 07:25 AM
  • 1,635 views

Let’s Explore ‘Light Echoes’ in Space

by Jason Carr in Wired Cosmos

Astronomers have learned a great many things via the study of variable stars throughout the years. Perhaps some of the most exciting phenomena studied by scientists involve those which emit bright pulses of light during eruptive or disruptive events (such as novae or supernovae). Because of the light emitted, there is actually a brief period [...]... Read more »

A. Rest, B. Sinnott, & D. L. Welch. (2012) Light Echoes of Transients and Variables in the Local Universe. PASA. arXiv: 1204.1341v1

Rest A, Suntzeff NB, Olsen K, Prieto JL, Smith RC, Welch DL, Becker A, Bergmann M, Clocchiatti A, Cook K.... (2005) Light echoes from ancient supernovae in the Large Magellanic Cloud. Nature, 438(7071), 1132-4. PMID: 16372003  

Rest, A., Sinnott, B., Welch, D., Narayan, G., Mandel, K., Huber, M., & Blondin, S. (2011) ON THE INTERPRETATION OF SUPERNOVA LIGHT ECHO PROFILES AND SPECTRA. The Astrophysical Journal, 732(1), 2. DOI: 10.1088/0004-637X/732/1/2  

  • April 3, 2012
  • 02:08 PM
  • 1,492 views

New Study: History of Early Solar System

by Jason Carr in Wired Cosmos

The early days of our solar system might look quite different than previously thought, according to research at the U.S. Department of Energy’s (DOE) Argonne National Laboratory published in Science. The study used more sensitive instruments to find a different half-life for samarium, one of the isotopes used to chart the evolution of the solar system. [...]... Read more »

Kinoshita, N., Paul, M., Kashiv, Y., Collon, P., Deibel, C., DiGiovine, B., Greene, J., Henderson, D., Jiang, C., Marley, S.... (2012) A Shorter 146Sm Half-Life Measured and Implications for 146Sm-142Nd Chronology in the Solar System. Science, 335(6076), 1614-1617. DOI: 10.1126/science.1215510  

  • April 2, 2012
  • 11:12 AM
  • 1,503 views

Honing in on Dark Energy & Neutrinos

by Jason Carr in Wired Cosmos

Analysis of data from the 10-meter South Pole Telescope is providing new support for the most widely accepted explanation of dark energy — the source of the mysterious force that is responsible for the accelerating expansion of the universe. The results also are beginning to hone in on the masses of neutrinos, the most abundant [...]... Read more »

C. L. Reichardt, B. Stalder, L. E. Bleem, T. E. Montroy, K. A. Aird, K. Andersson, R. Armstrong, M. L. N. Ashby, M. Bautz, M. Bayliss.... (2012) Galaxy clusters discovered via the Sunyaev-Zel'dovich effect in the first 720 square degrees of the South Pole Telescope survey. The Astrophysical Journal. arXiv: 1203.5775v1

B. A. Benson, T. de Haan, J. P. Dudley, C. L. Reichardt, K. A. Aird, K. Andersson, R. Armstrong, M. Bautz, M. Bayliss, G. Bazin.... (2011) Cosmological Constraints from Sunyaev-Zel'dovich-Selected Clusters with X-ray Observations in the First 178 Square Degrees of the South Pole Telescope Survey. The Astrophysical Journal. arXiv: 1112.5435v1

  • April 2, 2012
  • 02:04 AM
  • 1,481 views

How black holes grow

by Jason Carr in Wired Cosmos

A study (referenced below) led by a University of Utah astrophysicist found a new explanation for the growth of supermassive black holes in the center of most galaxies: they repeatedly capture and swallow single stars from pairs of stars that wander too close. Using new calculations and previous observations of our own Milky Way and [...]... Read more »

Benjamin C. Bromley, Scott J. Kenyon, Margaret J. Geller, & Warren R. Brown. (2012) Binary Disruption by Massive Black Holes: Hypervelocity Stars, S Stars, and Tidal Disruption Events. The Astrophysical Journal. arXiv: 1203.6685v1

  • March 30, 2012
  • 04:18 PM
  • 1,150 views

Clocking an Accelerating Universe

by Jason Carr in Wired Cosmos

Some six billion light years ago, almost halfway from now back to the big bang, the universe was undergoing an elemental change. Held back until then by the mutual gravitational attraction of all the matter it contained, the universe had been expanding ever more slowly. Then, as matter spread out and its density decreased, dark [...]... Read more »

Lauren Anderson, Eric Aubourg, Stephen Bailey, & et al. (2012) The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample. Monthly Notices of the Royal Astronomical Society . arXiv: 1203.6594v1

Beth A. Reid, Lado Samushia, Martin White, & et al. (2012) The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z. Monthly Notices of the Royal Astronomical Society . arXiv: 1203.6641v1

  • March 29, 2012
  • 11:15 AM
  • 1,165 views

Astronomers Find Anomaly Around Ancient Black Hole

by Jason Carr in Wired Cosmos

Using the IRAM array of millimetre-wave telescopes in the French Alps, a team of European astronomers from Germany, the UK and France has discovered a large reservoir of gas and dust in a galaxy that surrounds the most distant supermassive black hole known. Light from the galaxy, called J1120+0641, has taken so long to reach [...]... Read more »

B. P. Venemans, R. G. McMahon, F. Walter, R. Decarli, P. Cox, R. Neri, P. Hewett, D. J. Mortlock, C. Simpson, & S. J. Warren. (2012) Detection of atomic carbon [CII] 158 micron and dust emission from a z. APJ Letters. arXiv: 1203.5844v1

  • March 23, 2012
  • 04:56 AM
  • 1,846 views

The Bizarreness Effect and Spotting E.T.

by Jason Carr in Wired Cosmos

Recently I’ve been researching historical accounts of UFO sightings/alien abductions (this topic never ceases to fascinate me) and exploring possible scientific explanations for their occurrences when I stumbled across a theory known as the bizarreness effect. I thought I would share a little of what I’ve learned of this theory and would love to hear [...]... Read more »

  • March 21, 2012
  • 08:05 AM
  • 1,093 views

Let’s Explore the Formation & Migration of Planets

by Jason Carr in Wired Cosmos

Scientists from the University of Cambridge and Universidad Nacional Autónoma de México (UNAM) recently released a paper – Recent Developments in Planet Migration Theory (referenced below) that has some interesting implications for extrasolar planetary studies. I thought a brief discussion of this topic might be beneficial to those of you that are interested in learning more about: [...]... Read more »

Clément Baruteau, & Frédéric Masset. (2012) Recent developments in planet migration theory. Tidal effects in Astronomy and Astrophysics. arXiv: 1203.3294v1

Harpaz, A. (1991) The formation of a planetary nebula. The Physics Teacher, 29(5), 268. DOI: 10.1119/1.2343311  

Lucy, L. (1967) Formation of Planetary Nebulae. The Astronomical Journal, 813. DOI: 10.1086/110452  

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