Featured Research

from universities, journals, and other organizations

Supernovae Not What They Used To Be; Distant Supernovae Distinctly Brighter

Date:
October 28, 2007
Source:
University Of Toronto
Summary:
Exploding stars that light the way for research on dark energy aren't as powerful or bright, on average, as they once were, say astronomers. The study, which compared supernovae in nearby galaxies with those that exploded up to nine billion light years away in the distant universe, found the distant supernovae were an average of 12 per cent brighter. The distant supernovae were brighter because they were younger, the study found.

Using the NASA/ESA Hubble Space Telescope, astronomers pinpointed a blaze of light from the farthest supernova ever seen, SN 1997ff -- a dying star that exploded 10 billion years ago.
Credit: NASA/ESA, Adam Riess (Space Telescope Science Institute)

Exploding stars that light the way for research on dark energy aren’t as powerful or bright, on average, as they once were, says a new study by University of Toronto astronomers.

The study, which compared supernovae in nearby galaxies with those that exploded up to nine billion light years away in the distant universe, found the distant supernovae were an average of 12 per cent brighter. The distant supernovae were brighter because they were younger, the study found.

Since uniformly bright exploding stars help astronomers study the nature of dark energy – an unknown type of energy that causes the universe to accelerate its expansion – the team’s findings suggest it could become more difficult to study dark energy in the future. Astronomers can correct for supernovae of varying brightness, but it will prove challenging.

“The findings do not call into question that the universe is accelerating but the evolving mix of supernovae could limit future attempts to determine the nature of dark energy,” said Andrew Howell, lead author of the study and post-doctoral researcher.

“You can think of supernovae as light bulbs,” he said. “We found that the early universe supernovae had a higher wattage, but as long as we can figure out the wattage, we should be able to correct for that. Learning more about dark energy is going to take very precise corrections though and we aren’t sure how well we can do that yet.”

The paper, Predicted and Observed Evolution in the Mean Properties of Type Ia Supernovae with Redshift, was co-authored by post-doctoral researchers Mark Sullivan and Alex Conley and Professor Ray Carlberg of astronomy and astrophysics. It appears in the Sept. 20 issue of the Astrophysical Journal Letters.


Story Source:

The above story is based on materials provided by University Of Toronto. The original article was written by Christine Elias. Note: Materials may be edited for content and length.


Cite This Page:

University Of Toronto. "Supernovae Not What They Used To Be; Distant Supernovae Distinctly Brighter." ScienceDaily. ScienceDaily, 28 October 2007. <www.sciencedaily.com/releases/2007/10/071024150023.htm>.
University Of Toronto. (2007, October 28). Supernovae Not What They Used To Be; Distant Supernovae Distinctly Brighter. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2007/10/071024150023.htm
University Of Toronto. "Supernovae Not What They Used To Be; Distant Supernovae Distinctly Brighter." ScienceDaily. www.sciencedaily.com/releases/2007/10/071024150023.htm (accessed September 17, 2014).

Share This



More Space & Time News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

East Coast Treated To Rare Meteor Sighting

East Coast Treated To Rare Meteor Sighting

Newsy (Sep. 16, 2014) — Numerous residents along the East Coast reported seeing a bright meteor flash through the sky Sunday night. Video provided by Newsy
Powered by NewsLook.com
Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) — Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
NASA Picks Boeing and SpaceX to Ferry Astronauts

NASA Picks Boeing and SpaceX to Ferry Astronauts

AP (Sep. 16, 2014) — NASA is a giant step closer to launching Americans again from U.S. soil. It has announced it has picked Boeing and SpaceX to transport astronauts to the International Space Station in the next few years. (Sept. 16) Video provided by AP
Powered by NewsLook.com
NASA to Resume Human Space Flight, Focus on Mars

NASA to Resume Human Space Flight, Focus on Mars

Reuters - US Online Video (Sep. 16, 2014) — NASA awards contracts to Boeing and SpaceX to ferry astronauts to the international space station, saying the move will allow the space agency to focus on more ambitious missions like sending humans to Mars. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

    Technology News



    Save/Print:
    Share:  

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile iPhone Android Web
    Follow Facebook Twitter Google+
    Subscribe RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins