blog_log#10

Shapeshifter shaking

with strange hands, some say I am

Fresher than Maine clams

A lot of progress was made this week in terms of data reduction (as far as I know). I made stacks per viewing cycle, and ran some wholesale photometry on my lightcurves from 1 night stacks. My goal right now is to plot the figures I have generated a la Noah’s suggestion in slack. It is not yet successful. In terms of data what needs to be done next is modify my aperture settings, loop thorough the periodograms for the all night stacks, and then plot a gallery of those at R and I band. Then rinse and repeat for the cycle stacks.

So far I’ve made a gallery of lightcurves. It was a little tricky to get Noah’s plotting routine going but now it is up and running. I’ve edited it a little to suit my data and provide a little more information, but it is mostly from his slack post. The link to the file is below.

All night:

Cycle:

I have also been doing some LS periodogram analysis and the first thing that strikes me is that the best period for a given target bewteen cycle and all night data are pretty different. For example, this is a periodic looking source in Tess R-band:

And then below it is the same target with more data points. The periods are quite different. My understanding is that when we add data points we are making out previous result with less data more accurate. Do we expect it on the order of 6 hours, is that comprable within error?

I can reconcile, however, why a given target in two different bands might appear different. There could be a astrophysical explanation explaining that discrepancy (that also can be difficult to diagnose, though right?), as oppose to the adding points issue where I find that to be more under a statistics concern.

Does it make sense to test the goodness of the fits like the ones above with a chi squared analysis? Would it make more sense to do that the more data there are? Or is the nature of the LS providing a model of a good chi sq value?

Accessing this data is my next step. I need to go through and really nitpick what I have taken. Compare with AIJ and Cassidy to assure the lightcurves are good, and then start looking at the LS periodograms. As well as continue to work on the poster draft for tomorrow. Some good suggestions that I received from Mikey last week in class was that to make sure that the plots are telling as much of the story, if not more, than the text on the poster. They shouldn’t be some random analysis plots, they should help carry on the narrative and connect back to the project goals presented in the introduction.