| | 32 | || '''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 || |
