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Rosalba Perna

Content About: Rosalba Perna

Published: 01/08/2013 - 12:26pm Type of Content: Article-Research Highlight

Many neutron stars are surrounded by accretion disks. The disks are often made up of matter pulled in by the neutron star’s gravity from a companion star in a binary system. Over time, the neutron stars can swallow so much additional material that they collapse into black holes.

Recently, research associate Bruno Giacomazzo and Fellow Rosalba Perna studied this collapse process in...

Published: 12/27/2011 - 5:00pm Type of Content: Article-Research Highlight

Some stars die dramatically – the light from the supernova explosion of a distant massive star can outshine an entire galaxy. But this event isn’t the endgame for the star — the dense remnants of some of these explosions (called neutron stars) can spit out light rays over thousands of years. 

Astronomers have noticed that some of these neutron stars emit bursts of high-energy light...

Published: 01/20/2011 - 5:00pm Type of Content: Article-Research Highlight

Hot Jupiters — giant gas planets orbiting close to their parent stars — aren’t just scorched (at temperatures of >1000 K). They are also swollen up larger than can be explained by the intense heat from their host stars. Recently Fellow Rosalba Perna and her colleagues from Columbia University and the Kavli Institute for Theoretical Physics suggested a reason...

Published: 06/17/2013 - 1:23pm Type of Content: News

Rosalba Perna has won the 2010 SIGRAV Prize from the Italian Society of General Relativity and Gravitational Physics.  The prize is one of the most prestigious Italian prizes in astrophysics. It is given biannually to an Italian astrophysicist under age 40 who has distinguished herself for work related to gravity. Perna is being honored for her work on neutron stars, black holes, and...

Published: 09/29/2008 - 6:00pm Type of Content: Article-Research Highlight

Until recently, astronomers have had difficulty figuring out the composition and size of dust grains in galaxies beyond the Milky Way. They've had some luck with the Large and Small Magellanic Clouds (LMC and SMC, respectively). However, these two "satellite" galaxies are practically our next-door neighbors and much easier to observe.

Now, however, information about...

Published: 02/09/2008 - 5:00pm Type of Content: Article-Research Highlight

Neutron stars are born in supernovae, spinning very fast. How fast they spin at birth depends on a variety of factors including the initial rotation of the star that goes supernova and what takes place during the supernova explosion. So, if you want to understand these phenomena, one place to start is by investigating how fast a new neutron star can initially spin.

Fellow Rosalba Perna...

Published: 04/08/2007 - 6:00pm Type of Content: Article-Research Highlight

There’s a new aspect to research on gamma-ray bursts: their use to discern features of the environment around the star that produced them during its core’s collapse into a black hole. This type of analysis is possible because the spectrum of a gamma-ray burst afterglow is a straight-line continuum without features. Absorption lines can appear in the spectrum because of the...

Published: 04/08/2006 - 6:00pm Type of Content: Article-Research Highlight

Gamma-ray bursts signal the birth of a new black hole, whether it's created during the collapse of a massive star or via a merger between two compact objects such as neutron stars. Astrophysicists have determined that long gamma-ray bursts are associated with collapsing stars and short bursts are associated with binary mergers. In both cases, however, black-hole accretion powers the...

Published: 04/08/2005 - 6:00pm Type of Content: Article-Research Highlight

Rosalba Perna and colleagues Jonathan Granot of Stanford and Enrico Ramirez-Ruiz of Princeton's Institute for Advanced Study recently figured out the relationship between X-ray flashes, X-ray rich gamma-ray bursts, and gamma-ray bursts detected by different space-based observatories. X-ray flashes are transient astronomical X-ray sources that last from several seconds to a few minutes....

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