star system that may explode
Last Updated : GMT 06:49:16
Arab Today, arab today
Arab Today, arab today
Last Updated : GMT 06:49:16
Arab Today, arab today

Supernova progenitor found?

Star system that may explode

Arab Today, arab today

Arab Today, arab today Star system that may explode

Star system that may explode
London - Arabstoday

Star system that may explode London - Arabstoday Type Ia supernovae are violent stellar explosions. Observations of their brightness are used to determine distances in the universe and have shown scientists that the cosmos is expanding at an accelerating rate. But there is still too little known about the specifics of the processes by which these supernovae form. New research, led by Stella Kafka of the Carnegie Institution for Science in the United States, identifies a star system, prior to explosion, which will possibly become a type Ia supernova. The work will appear in the journal Monthly Notices of the Royal Astronomical Society. The widely accepted theory is that type Ia supernovae are thermonuclear explosions of a white dwarf star that's part of a binary system -- two stars that are physically close and orbit around a common centre of mass. The white dwarf has mass gradually donated to it by its companion. When the white dwarf mass eventually reaches 1.4 times that of the sun, it explodes to produce a type Ia supernova. The crucial questions are: What is the nature of the donor star and how does this white dwarf increase its mass. Also, how would that process affect the properties of the explosion? With these questions in mind, scientists have been searching for candidate systems that could become type Ia supernovae. There are thousands of possibilities in the candidate pool, none of which have yet been observed to produce an explosion. Recent studies, some of which involved scientists at Carnegie observatories, have identified sodium gas associated with type Ia supernovae. This gas might be ejected from the binary's donor star and linger around the system to be detected after the white dwarf explodes. This provides a clue to the progenitor. Even so, Kafka still compared the search to "looking for a needle in a stellar haystack." Using data from the DuPont telescope of the Las Campanas observatory in Chile, Kafka and her team -- Kent Honeycutt of Indiana University and Bob Williams of the Space Telescope Science Institute -- looked at these gas signatures and were able to identify a binary star called QU Carinae as a possible supernova progenitor. It contains a white dwarf, which is accumulating mass from a giant star, and sodium has been detected around the system. This star belongs to a small category of binaries that are very bright and in which the white dwarf accretes material from its companion at very high rates. Sodium should be produced in the atmosphere of the mass-donor giant star, and it can be ejected from the system via a stellar wind. If the white dwarf of this binary explodes into a supernova, the sodium would be detected with the same sort of signature as those found in other type Ia supernovae. "We are really excited to have identified such a system," Kafka said. "Understanding these systems, the nature of the two stars, the manner in which mass is exchanged, and their long-term evolution will give us a comprehensive picture on how binaries can create one of the most important explosions in the universe." From sciencedaily

arabstoday
arabstoday

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

star system that may explode star system that may explode

 



Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

star system that may explode star system that may explode

 



GMT 10:10 2017 Thursday ,09 February

3 Important Elements You Have to Consider

GMT 04:03 2017 Monday ,24 April

Bella Hadid ‘dying’ to visit Palestine

GMT 19:25 2016 Wednesday ,25 May

The Brooklyn Desk by Oeuf NYC

GMT 07:49 2018 Friday ,05 January

2 Russian servicemen killed

GMT 07:58 2018 Monday ,01 January

Italy orders N. Korea's envoy to leave

GMT 08:45 2017 Wednesday ,20 December

US military imagines war without GPS

GMT 17:26 2017 Sunday ,17 December

Putin thanks Trump for help in foiling attack plot

GMT 22:19 2017 Monday ,16 October

Cairo-hosted Fatwa conf. new contribution

GMT 02:27 2016 Friday ,10 June

Video hints Japan abetting illegal ivory trade

GMT 07:04 2017 Wednesday ,19 April

1,883 Bahrainis found jobs in March

GMT 14:24 2016 Tuesday ,22 November

Citi and JPMorgan top list of ‘globally banks’
Arab Today, arab today
 
 Arab Today Facebook,arab today facebook  Arab Today Twitter,arab today twitter Arab Today Rss,arab today rss  Arab Today Youtube,arab today youtube  Arab Today Youtube,arab today youtube

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

arabstoday arabstoday arabstoday arabstoday
arabstoday arabstoday arabstoday
arabstoday
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
arabstoday, Arabstoday, Arabstoday