Spacebuzz

Blog posts tagged with data

Posts in the past four weeks

Wednesday
Sep 03 2014
23:43 UTC

calibration and search

... noise in the Kepler data and the impact of such methods on exoplanet search. In the morning conversation, we discussed the relative value of using other stars as predictors for the target star (because co-variability of stars encodes telescope variability) compared to using the target star itself, but shifte

Posted by Hogg's Research

Tuesday
Sep 02 2014
03:59 UTC

exoplanet search

Back when we were in Tübingen, Foreman-Mackey promised Schölkopf that he would find some new exoplanets by September 1. That's today! He failed, although he has some very impressive results recovering some known systems that are supposed to be hard to find. That is, it looks like existing systems are found at higher significance for us than for other groups, so we ought to be able to find some lower-significance systems. The key technology (we think) is our insanely flexible no...

Posted by Hogg's Research

Friday
Aug 29 2014
03:59 UTC

exoclocks: period and phase precision

... against using fake data; all it provides is a functional test of your code! But

Posted by Hogg's Research

Thursday
Aug 28 2014
21:05 UTC

Making Radio Galaxies in a Computer

At a conceptual level the formation of radio galaxies is pretty simple. According to a basic picture first introduced in the 1970s, a supermassive black hole in the center of a galaxy generates a symmetric pair of oppositely directed, high speed jets or beams of hot, ionized gas as a by-product of energy released or […]

Posted by Galaxy Zoo Blog

Thursday
Aug 28 2014
03:59 UTC

words on a plane

While in transit back to NYC, I worked on writing more about Ness and my quadratic-in-tags model for stellar spectra in our manuscript, and she got the quadratic model to work from end to end. It looks extremely promising.

Posted by Hogg's Research

Tuesday
Aug 26 2014
18:00 UTC

data science, data-driven models

... working with Ness on our data-driven models of stars. We got the code to go from first-order (linear) linear fitting to second-order (quadratic) linear fitting, and vowed that we would never go to third order! We will use a Gaussian Process before we do that. We discussed outliers—both outlier stars and outlier pixels—and how to deal with them while still retaining computational tractability,

Posted by Hogg's Research

Thursday
Aug 21 2014
03:59 UTC

stars in galaxies; data-driven metallicities

MPIA Milky-Way group meeting was excellent today. Ross Fadely talked about our star–galaxy separation projects and showed some very encouraging signs that a supervised regression system to predict stellarity using the object colors might work. We are training not on the labels (star or galaxy) but on the morphological inputs that are used to make those labels. Nicholas Martin (Strasbourg) showed incredible maps of the outskirts of M31 split by metallicity. He is building the maps with

Posted by Hogg's Research

Wednesday
Aug 20 2014
03:59 UTC

the lamentations of radio astronomy

... quantity of well flagged data to "learn"

Posted by Hogg's Research

Tuesday
Aug 19 2014
03:59 UTC

sparse image priors for radio interferometry

... input scenes for fake data, when he samples, but that the op

Posted by Hogg's Research

Thursday
Aug 14 2014
03:59 UTC

causal pixel modeling, day 2

... that pooled much more data to do it—we wouldn't be able to wo

Posted by Hogg's Research

Wednesday
Aug 13 2014
03:59 UTC

causal pixel modeling, day 1

Today Foreman-Mackey and I arrived in Tübingen to work with Schölkopf. On arrival, we got Dun Wang on the phone, because our trip to MPI-IS is designed to make huge progress on Wang's recalibration of the Kepler satellite detector pixels, using the variations that are found in common across stars. The way Schölkopf likes to say it is that we are capitalizing on the causal structure of the problem: If stars (or, really, pixels illuminated by stars) co-vary it must be because...

Posted by Hogg's Research

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