Planck data release dates

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Drakkith

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Ohhh, nice. Can't wait to see the results!
 

Chronos

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And only a couple months late ... were they trying to smooth out any 'axis of evil' effects? [a conspiracy theory thing].
 
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Im excited by this prospect, we could get something really new. But on the other hand it could just be WMAp to a few extra decimal places, that would be so dissapointing.
Hopefully if so there be a bit more interest to build a deidcated b polarisation mission.
 

Chalnoth

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And only a couple months late ... were they trying to smooth out any 'axis of evil' effects? [a conspiracy theory thing].
Haha, well, I think it's been set for March for quite some time, though I don't recall precisely.

Anyway, I think the main thing that makes it take so long is nailing down the systematic effects, such as the precise beam shapes and noise properties. These can all have subtle and difficult-to-nail-down impacts on the scientific products.
 
536
2
Im excited by this prospect, we could get something really new. But on the other hand it could just be WMAp to a few extra decimal places, that would be so dissapointing.
Hopefully if so there be a bit more interest to build a deidcated b polarisation mission.
I was in a seminar listening to Martin Bucher from Planck Mission today, he said that we have to wait *another year* for polarization data... :uhh:
 

Chalnoth

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I was in a seminar listening to Martin Bucher from Planck Mission today, he said that we have to wait *another year* for polarization data... :uhh:
That sounds about right to me. The polarization signal is much, much lower, which means it's much, much harder to nail the systematic effects down well enough to make for a good signal. It doesn't help that Planck wasn't really built to be a polarimeter: it was built for temperature anisotropies. Polarization was tacked-on later, and it's actually not all that good at it. It should still be better than WMAP for polarization, of course, but dedicated polarization experiments, such as EBEX, are much, much better when it comes to controlling systematic effects related to polarization.
 
472
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I have been under the impression that whilst discovering the B mode polarisation is unlikely, there is some small chance that Planck could do this.
However from what I read above, it appears that even if it does make this discovery ( i know its not desinged for that) we wont know about it this MArch/ April, but it's another year away?
 
536
2
I have been under the impression that whilst discovering the B mode polarisation is unlikely, there is some small chance that Planck could do this.
However from what I read above, it appears that even if it does make this discovery ( i know its not desinged for that) we wont know about it this MArch/ April, but it's another year away?
That's my understanding from the seminar; we will know soon later this month if they do release any polarization data.
 

Chalnoth

Science Advisor
6,192
442
I have been under the impression that whilst discovering the B mode polarisation is unlikely, there is some small chance that Planck could do this.
However from what I read above, it appears that even if it does make this discovery ( i know its not desinged for that) we wont know about it this MArch/ April, but it's another year away?
Right. Polarization data is really really finicky, and subject to all sorts of potential problems. One major issue is that systematic effects which cancel when performing a temperature measurement may add and become even larger when taking a polarization measurement.

This is becomes the temperature signal comes from averaging the value of the polarization signals together, while the polarization signal comes from subtracting them. So if one systematic effect pushes one signal up while the other signal goes down, the temperature signal is unaffected, but the polarization signal sees a huge result. And because the actual polarization signal is only a small fraction of the temperature signal, any systematic effects that remain in the data are bad news.
 

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