Changes between Version 173 and Version 174 of AstroTechTalk

Timestamp:

18 Feb 2016, 15:57:20 (8 years ago)

Author:

Ralph Hofferbert

Comment:

--

AstroTechTalk

@@ -31 +31 @@
 || 12.02.2016 || -- || Carnival break ||
 || '''19.02.2016''' || '''Jeroen Bouwman''' || '''Precise spectro-photometry from space'''[[BR]][[BR]]The first thing, which naturally comes to mind when asked what one can do with spectra, is the detection of spectral lines of atomic and molecular gas or the signature of dust grains. With this, the chemistry and physical conditions of very different astronomical environments can be probed, like stellar and planetary atmospheres and the interstellar medium and molecular clouds. [[BR]][[BR]]For many applications such as radial velocity measurements a high spectral resolution and very accurate wavelength calibration is more important than a precise absolute flux calibration of the measurements. However, many scientific applications exist where highly accurate spectro-photometric (i.e. the absolute and relative flux calibration for each spectral channel) is crucial. One can think of spectroscopic observations of transiting exoplanets, time-variability of circumstellar disks or simply constructing spectral energy distributions by combining the observations of multiple instruments spanning a wide wavelength range. [[BR]][[BR]]Jeroen Bouwman will discuss some of the problems encountered and their solutions to achieve precise spectro-photometry from space for three different spectrographs: The low resolution spectrograph of Spitzer, the photoconductor array camera and spectrometer of Herschel, and the mid-infrared instruments of the James Webb Space Telescope.[[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S1/2016-02-19_Spectrophotometry.pdf Slides: Englisch][[BR]]Questions: German, English ||
-|| 26.02.2016 || Florian Rodler || The search for Earth 2.0[[BR]] ||
+|| '''26.02.2016''' || '''Florian Rodler''' || '''The search for Earth 2.0'''[[BR]][[BR]]More than 20 years ago, the first exoplanet orbiting a sun-like star was discovered. In these 20 years, a completely new branch of astronomy has been created: the search for exoplanets and especially for earth-like planets. We are getting closer and closer in finding an answer to one of the oldest and most fundamental questions of mankind: Are we alone in the universe? Is there life outside the earth?[[BR]][[BR]]Rather soon, astronomy will undergo a revolution - new giant telescopes are about to be built allowing for an investigation of those faraway worlds in the coming years with a precision surpassing all current standards. We will be the first generation of human beings, which will discover extraterrestial signs of life.[[BR]][[BR]]Florian Rodler will briefly talk about the discovery methods for exoplanets. He will present the current status of research in this field and will sketch those strategies, which allow scientists to identify habitable planets and to find the signatures of life. [[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S1/2016-02-26_Erde2Punkt0.pdf Slides: German][[BR]]Questions: German, English ||
 || 04.03.2016 || || ||
 || 11.03.2016 || Markus Poessel || Gravitational waves and how to detect them ||