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tag:blogger.com,1999:blog-6762481015010870446.post-1440407318455121608: 'Cannibalism' Between Stars
Astro Watch

Direct link 'Cannibalism' Between Stars

6 Feb 2016, 22:08 UTC <div class="separator" style="clear: both; text-align: center;"><a href="https://2.bp.blogspot.com/-wqF8cLL7Btc/VrZt_Ybv9WI/AAAAAAAAzDw/bUWBjlBWLHw/s1600/108376_web.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="This is a Simulation of a gravitationally unstable circumstellar disk by means of hydrodynamic calculations. Protoplanetary 'embryo' form in the disc thanks to gravitational fragmentation. The three small pictures show the successive 'disappearance' of the lump by the star. Credit: Eduard Vorobyov, Universität Wien" border="0" height="324" src="https://2.bp.blogspot.com/-wqF8cLL7Btc/VrZt_Ybv9WI/AAAAAAAAzDw/bUWBjlBWLHw/s640/108376_web.jpg" title="This is a Simulation of a gravitationally unstable circumstellar disk by means of hydrodynamic calculations. Protoplanetary 'embryo' form in the disc thanks to gravitational fragmentation. The three small pictures show the successive 'disappearance' of the lump by the star. Credit: Eduard Vorobyov, Universität Wien" width="640" /></a></div><br /><span style="font-family: Helvetica Neue, Arial, Helvetica, sans-serif;"><div style="text-align: justify;">Stars are born inside a rotating cloud of interstellar gas and dust, which contracts to stellar densities thanks to its own gravity. Before finding itself on the star, however, most of the cloud lands onto a circumstellar disk forming around the star owing to conservation of angular momentum. The manner in which the material is transported through the disk onto the star, causing the star to grow in mass, has recently become a major research topic in astrophysics.<a name="more"></a></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">It turned out that stars ...
tag:blogger.com,1999:blog-1014682403395027648.post-1737128207060055392: The First Known Multi-Planet System in an Open Cluster
Beyond Earthly Skies

Direct link The First Known Multi-Planet System in an Open Cluster

6 Feb 2016, 22:00 UTC <div class="separator" style="clear: both; text-align: center;"><a href="http://3.bp.blogspot.com/-XurhdpYY5oo/VrBTbseEWzI/AAAAAAAAIGg/opEmEK0GMxI/s1600/Post%2B-%2BFebruary%2B2016%2B%25287%2529.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="338" src="http://3.bp.blogspot.com/-XurhdpYY5oo/VrBTbseEWzI/AAAAAAAAIGg/opEmEK0GMxI/s640/Post%2B-%2BFebruary%2B2016%2B%25287%2529.jpg" width="640" /></a></div><div style="text-align: center;"><span style="font-family: inherit;"><br /></span></div><span style="font-family: inherit;">The Beehive Cluster is an open cluster containing ~1000 stars and it is one of the nearest open clusters. Pr 0211 is a Sun-like star located in the Beehive Cluster. It has a hot-Jupiter identified as Pr 0211b in orbit around it. Pr 0211b has at least 1.88 ± 0.03 times the mass of Jupiter and its orbital period is 2.15 days. Using new radial velocity measurements obtained with HARPS-N and TRES, Malavolta et al. (2016) present the discovery of a second planet in orbit around Pr 0211. The discovery of this second planet means that the planetary system around Pr 0211 is the first known multi-planet system in an open cluster.</span><br /><span style="font-family: inherit;"><br /></span><span style="font-family: inherit;">The newly discovered planet around Pr 0211 is identified as Pr 0211c. It is a massive Jupiter-like planet with at least 7.9 ± 0.2 times the mass of Jupiter, and its orbital period around its host star is greater than 3500 days. Furthermore, Pr 0211c is in a highly eccentric orbit around its host star, with an orbital eccentricity greater than ...
tag:blogger.com,1999:blog-6762481015010870446.post-163083638326234094: Astrophysicists Use New Methods to Simulate the Common-envelope Phase of Binary Stars
Astro Watch

Direct link Astrophysicists Use New Methods to Simulate the Common-envelope Phase of Binary Stars

6 Feb 2016, 16:47 UTC <div class="separator" style="clear: both; text-align: center;"><a href="https://2.bp.blogspot.com/-qTwviwCEBRc/VrYiviKp_CI/AAAAAAAAzDQ/PnCb-6tM45I/s1600/commonenvelope-density-orbitalplane-105d.png" style="margin-left: 1em; margin-right: 1em;"><img alt="Slices through the three-dimensional simulation volume after 105 days in the common envelope. In the orbital plane, the companion star and the red giant core are circling around each other. Credit: Sebastian Ohlmann / HITS" border="0" height="330" src="https://2.bp.blogspot.com/-qTwviwCEBRc/VrYiviKp_CI/AAAAAAAAzDQ/PnCb-6tM45I/s640/commonenvelope-density-orbitalplane-105d.png" title="Slices through the three-dimensional simulation volume after 105 days in the common envelope. In the orbital plane, the companion star and the red giant core are circling around each other. Credit: Sebastian Ohlmann / HITS" width="640" /></a></div><br /><span style="font-family: Helvetica Neue, Arial, Helvetica, sans-serif;"><div style="text-align: justify;">When we look at the night sky, we see stars as tiny points of light eking out a solitary existence at immense distances from Earth. But appearances are deceptive. More than half the stars we know of have a companion, a second nearby star that can have a major impact on their primary companions. The interplay within these so-called binary star systems is particularly intensive when the two stars involved are going through a phase in which they are surrounded by a common envelope consisting of hydrogen and helium. Compared to the overall time taken by stars to evolve, this phase is extremely short, so astronomers ...
50ED86EB-607A-42CE-9C88F769D4CE54AF: The Comet That Battered Jupiter, and Shook Congress
Scientific American

Direct link The Comet That Battered Jupiter, and Shook Congress

6 Feb 2016, 13:15 UTC
https://palereddot.org/?p=753: The Las Cumbres Global Telescope Network
Pale Red Dot

Direct link The Las Cumbres Global Telescope Network

6 Feb 2016, 10:25 UTC
http://www.davidreneke.com/?p=30775: Fly High and Live Longer
David Reneke's World of Space and Astronomy

Direct link Fly High and Live Longer

6 Feb 2016, 05:20 UTC

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