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    <title><string language="fre"><![CDATA[CHARTING THE TRANSIENT SKY: THE PALOMAR TRANSIENT FACTORY]]></string></title>
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        <string language="fre"><![CDATA[Only about a hundred years ago astronomers came to 
recognize cosmic explosive events. What was once termed as Stella Nova 
are now divided into two major families, novae and supernovae (with real
 distinct classes in each). The variables and the explosions have been 
interesting in their own right and contributed richly to key problems in
 modern astrophysics: distances to galaxies and cosmography. The area of
 transient and variable stars is once again undergoing a renaissance due
 to wide field optical surveys.
The Palomar Transient Factory (PTF) was designed 
explicitly to chart the transient sky with a particular focus on events 
which lie in the nova-supernova gap. With its innovative two-telescope 
architecture it achieves both high cadence and large areal rate of 
coverage. PTF was commissioned during the summer of 2009. PTF is now 
finding an extragalactic transient every 20 minutes and a Galactic 
(strong) variable every 10 minutes. Spectroscopy undertaken at Keck and 
Palomar has allowed us: identify an emerging class of ultra-luminous 
supernovae, discover luminous red novae, undertake UV spectroscopy of Ia
 supernovae, discover supernovae powered by something other than 
Nickel-56, clarification of sub-classes of core collapse and 
thermo-nuclear explosions, map the systematics of core collapse 
supernovae, a trove of eclipsing binaries and many others.]]></string></description>
    <keyword><string language="fre"><![CDATA[Supernovae]]></string></keyword><keyword><string language="fre"><![CDATA[Spectroscopy]]></string></keyword><keyword><string language="fre"><![CDATA[Stars]]></string></keyword>
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NOTE:Shrinivas R. Kulkarni FRS (born 1956) is a professor of astrophysics and planetary science at California Institute of Technology. He is on the Space Interferometry Mission science team and is the director of optical observatories at California Institute of Technology, including Palomar and Keck. He is also the Jury Chair for the Infosys Prize 2013 for the discipline of Physical Sciences.     Source: Wikipedia (https://en.wikipedia.org/wiki/Shrinivas_Kulkarni) 
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            <date><dateTime>2011-03-18</dateTime></date>
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NOTE:Responsable communication à l'Institut d'Astrophysique de Paris  
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            <date><dateTime>2011-03-18</dateTime></date>
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