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astronomical methods

This tag is associated with 54 posts

SciCoder Recap

SciCoder is an annual workshop in New York City for early-career astronomers with the tagline: How I Learned To Stop Hating Coding and Start Getting Things Done.

Beyond Chi-Squared: An Introduction to Correlated Noise

A common measure of the quality of a fit is the chi-squared statistic. While common, implementation of this statistic assumes uncorrelated noise, which is much less common. Today, we discuss how to deal with noise that is correlated and why it’s important.

Piecing together the Hubble constant

Different methods of measuring the Hubble constant yield slightly different values, but they are still in reasonable agreement.

A new method for cosmic distances: using active galactic nuclei

Time delays in the light from AGNs’ dusty torii can tell us the intrinsic luminosity and hence the distance to the AGN.

Binary Hunting with Phase Variations

How do pulsating stars give away their secret identities as binary dance partners? In this paper, the authors demonstrate a new way to not only detect binaries we may have missed in the Kepler data, but also to measure their velocities without spectra.

Cloudy with a chance of Carbon Monoxide

Tune in now for the first extrasolar weather map of a nearby brown dwarf, made using Doppler imaging.

Supernovae Photospheres as Distance Indicators

By examining their expansion rate over time, Type II supernovae provide a way to measure extragalactic distances.

Constraining fine-structure constant variations using QSOs

From measurements of quasar spectra, we can determine whether or not the fine structure constant is really a constant.

The Little Star that Could (Teach us about Stellar Astrophysics)

Today we take a look back to 1916, when distances were measured in light years and uncertainties weren’t to be included in publications. The nearly 100-year old discovery of a small star has large implications for our understanding of stellar astrophysics, even today.

Dust in SPACE: Studying the growth of planetesimals with a suborbital rocket experiment

By sending a chamber of dust on a suborbital ballistic rocket, the authors of this paper hope to find out how planetesimals form.

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