![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
An exchange of work e-mails with the spiffy ![[livejournal.com profile]](https://www.dreamwidth.org/img/external/lj-userinfo.gif)
chefmayhem has reminded me to remind y'all to grab your binoculars (or telescope!) and head outside tonight!
Just two weeks ago -- on August 24th -- a Type Ia supernovae was spotted near us. Okay, it is 21,000,000 light years away, in the Pinwheel Galaxy. Still, on a cosmic scale, twenty-one million light years away is pretty near to us!
This supernova is particularly important, as it is both close to us and was spotted quite early on. Thus, it gives us a fantastic look at a Type Ia supernova in action. This type of supernova is triggered when a white dwarf in a binary star system accretes enough mass from its partner to pass the so-called Chandrasekhar limit of 1.4 solar masses. When that happens...
You get a runaway thermonuclear reaction that causes the star to explode.
Type Ia supernovae are generally all pretty similar. Thus, they are used as "standard candles" that help us to make significant comological observations; for instance, these supernovae are used to measure the expansion of the universe. Indeed, these are precisely the sort of supernovae that the Supernova Cosmology Project and the High-Z Supernova Search Team observed to discover dark energy in 1998! So making close up observations of a Type Ia will allow us to do supernova cosmology with even greater precision!
In the meantime, this particular supernovae has been getting ever-brighter over the past two weeks... and should now be at about its most intense! With a pair of good binoculars, you should be able to see it for yourself -- now there is a rare opportunity! So clear skies to you, dear friends, and happy hunting!
Notes:
chefmayhem has reminded me to remind y'all to grab your binoculars (or telescope!) and head outside tonight!Just two weeks ago -- on August 24th -- a Type Ia supernovae was spotted near us. Okay, it is 21,000,000 light years away, in the Pinwheel Galaxy. Still, on a cosmic scale, twenty-one million light years away is pretty near to us!
This supernova is particularly important, as it is both close to us and was spotted quite early on. Thus, it gives us a fantastic look at a Type Ia supernova in action. This type of supernova is triggered when a white dwarf in a binary star system accretes enough mass from its partner to pass the so-called Chandrasekhar limit of 1.4 solar masses. When that happens...
BOOM!
You get a runaway thermonuclear reaction that causes the star to explode.
Type Ia supernovae are generally all pretty similar. Thus, they are used as "standard candles" that help us to make significant comological observations; for instance, these supernovae are used to measure the expansion of the universe. Indeed, these are precisely the sort of supernovae that the Supernova Cosmology Project and the High-Z Supernova Search Team observed to discover dark energy in 1998! So making close up observations of a Type Ia will allow us to do supernova cosmology with even greater precision!
In the meantime, this particular supernovae has been getting ever-brighter over the past two weeks... and should now be at about its most intense! With a pair of good binoculars, you should be able to see it for yourself -- now there is a rare opportunity! So clear skies to you, dear friends, and happy hunting!
Notes:
- For those who want to know more, see here, here, here, here, and here.
- Since I have already seen this misconception pop up, I should note that Type Ia supernovae explode via a very different mechanism than core collapse supernovae. It is the latter that produce neutrinos in copious numbers. Thus, even if this particular supernova was in our own galaxy, no neutrino signal would be detected in Super-Kamiokande.
- Tis excellent to have the rare opportunity to use my supernova icon for a post that is actually about supernovae! (Even if the supernova in the picture is core collapse, and not Type Ia...)
- Writing this post took up the time that was supposed to go to the promised entry on the St. Giles bells. So the bells will have to wait -- I have theatre tickets in just over an hour! That's okay, though. The bells can wait -- after all, one of them has been around for nearly four hundred years! In contrast, the supernova won't wait. After tonight, it will dim and, to our eyes, be gone.
Tags: