AIP: LBT Gets Polarized: First Light for PEPSI

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AIP: LBT Gets Polarized: First Light for PEPSI

Post by bystander » Fri Oct 13, 2017 3:31 pm

LBT Gets Polarized: First Light for PEPSI Polarimeters
Leibniz Institute for Astrophysics, Potsdam | Large Binocular Telescope | 2017 Oct 12

Thanks to a cleverly designed "two-in-one" instrument attached to the world's most powerful telescope, astronomers can extract more clues about the properties of distant stars or exoplanets than previously possible.

Developed at the Leibniz-Institute for Astrophysics in Potsdam, Germany, the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) saw first light on April 1, 2015, after being successfully installed at the Large Binocular Telescope Observatory (LBTO) in Arizona, USA.

Once both of PEPSI's polarimeters were mounted in the focus points of each of the LBT's two 8.4-meter mirrors in early September 2017, the telescope was pointed to the star gamma Equ and polarized light was received. From these spectra astronomers can, for example, deduce the geometry and strength of magnetic fields on the surfaces of distant stars, or study the reflected light from the atmospheres of potentially habitable exoplanets.

A polarimeter separates starlight according to its oscillation planes. It is complementary to a spectrograph that, like a prism, separates light according to its oscillation frequencies (or color). The two combined, polarimeter and spectrograph, added to a powerful telescope, enable astronomers to obtain spectra in polarized light. This in turn allows the characterization of the full wave-front of the incoming stellar light and extract details of its radiation physics that otherwise remain hidden. ...
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

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AIP/LBT: First PEPSI Data Release

Post by bystander » Tue Jan 09, 2018 9:50 pm

First PEPSI Data Release
Leibniz Institute for Astrophysics Potsdam | 2018 Jan 09

The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first batch of high-spectral resolution data to the scientific community. In a series of three papers in the European journal Astronomy & Astrophysics, the PEPSI team presents a new spectral atlas of the Sun, a total of 48 atlases of bright benchmark stars, and a detailed analysis of the chemical abundances of the 10-billion year old planet-system host Kepler-444.

PEPSI deep spectra. I. The Sun-as-a-star - K. G. Strassmeier, I. Ilyin, M. Steffen PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards - K. G. Strassmeier, I. Ilyin, M. Steffen PEPSI deep spectra. III. A chemical analysis of the ancient planet-host star Kepler-444 - C. E. Mack III et al
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor