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spectroscopy

This tag is associated with 69 posts

A New Way with Old Stars: Fluctuation Spectroscopy

Astronomers use models to derive properties of individual stars that we cannot directly observe, such as mass, age, and radius. This is also the case for a group of stars (a galaxy or a star cluster). One problem with current stellar population models is that they remain untested for old populations of stars. The authors of this paper devise a new way to test models of old stellar populations.

Real-Time Stellar Evolution

Sometimes, stellar evolution happens on more human timescales—tens to hundreds of years rather than millions or billions.

A Deeper Look into the Atmospheres of HR8799 c and d with GPI

The authors break in the new Gemini Planet Imager with spectroscopy of the well-studied but not yet well-explained exoplanets HR 8799 c and d.

Searching for Life via Exoplanet Smog

Today’s paper proposes a detection method for technologically advanced life that goes beyond the usual SETI signals: looking at exoplanet atmospheres not just for the presence of life in general, but for the chemical signatures of intelligent life.

The Echoes of a Supernova

Spectra from the light echoes of distant supernovae can be used to probe the three dimensional structure of these massive and poorly-understood explosions.

Engineering at the SOAR Telescope in Chile

I recently participated in an engineering trip to the SOAR Telescope in Chile, where I helped with numerous maintenance and upgrades for the Goodman Spectrograph.

Spots and Tantrums: A Moody X-ray Binary

What do you call two stars hurtling around each other with bursts of X-rays every few decades? An X-ray transient, of course! This special flavor of X-ray binary features a neutron star or black hole together with a low-mass star.

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.

The Noble Crab

The Crab Nebula ups its game when it’s found to host the first molecule containing a noble gas to be found in space.

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.

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