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Super-Supernovae Spell Trouble for Dark Energy

Posted August 01, 2013 11:59 AM

From New Scientist - Online news:

WHEN Andy Howell announced what he had found, a gasp filled the lecture hall. "Nobody saw it coming," he says. That was in Prague in 2006. Howell, now at the University of California, Santa Barbara, was at a meeting of the International Astronomical Union presenting his team's latest observations of the exploding stars known as type-1a supernovae. We think we know what makes these stellar bombs tick - and a lot rides on us knowing it. Above all, they detonate with a similar brightness, a fact that allows us to calibrate distance in the universe. Observations of type-1a supernovae led 15 years ago to one of the landmark discoveries of modern cosmology: that the expansion of the universe is accelerating, fuelled by a shadowy agent since dubbed dark energy.

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Guru

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#1

Re: Super-Supernovae Spell Trouble for Dark Energy

08/02/2013 12:58 PM

In case one doesn't read the article and/or look at the links there, a link to Andy Howell's web page is the gateway to his ideas and articles.

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#2
In reply to #1

Re: Super-Supernovae Spell Trouble for Dark Energy

08/03/2013 12:56 AM

Thanks, I also found Andy's site and I think he sees more of an opportunity to refine the SN1a data than "trouble".

I do not have access to the sensational New Scientist article, but I found other, probably better articles. From Andy Howell's own website (where he calls the New Scientist article "just weird").

Articles in: NBC/space.com (this one is the best description), the New York Times, Time magazine (The Exploding Monty Python Star!); the LA Times (has some of the facts wrong), New Scientist (this one is just weird), and finally the UCSB press release. Here's a Science podcast with Ben."

As I understand it, supernovae SN1a may be caused by different situations, but they still all have roughly the same brightness and time signatures during the actual explosion. They are probably still excellent distance markers.

Form the NBC/Space.com article, where Howell himself has reportedly thrown in some sensationalism(!):

Quote:

"It is a total surprise to find that thermonuclear supernovae, which all seem so similar, come from different kinds of stars," said study author Andy Howell at Las Cumbres Observatory Global Telescope Network. "It is like discovering that some humans evolved from apelike ancestors, and others came from giraffes."

The new study also suggests that studying smaller star explosions called novas, which don't entirely destroy the star, might also shed light on Type 1a supernovas.

"We may be able to gain a better understanding of supernova 1a progenitor systems in general," Dilday said."

Does not say it all, but I think the message is clear.

--

Regards

Jorrie

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#3
In reply to #2

Re: Super-Supernovae Spell Trouble for Dark Energy

08/03/2013 7:06 PM

Thanks for your input. This is certainly not the first news article to have a bad title.

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