Phase-differential NIR integral field spectroscopy of transiting extrasolar planets

Details Phase-differential NIR integral field spectroscopy of transiting extrasolar planets Phase-differential NIR integral field spectroscopy of transiting extrasolar planets

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..810a&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Physics

Optics

Scientific paper

The technique of choice for spectroscopy of transiting extrasolar planets is to cancel the stellar contribution by using a differential method: Before the planet is disappearing during a superior conjunction (SC) or after its recurrence the observable signal is the sum of the light from the planet, the star, and various background contributions. During the SC, the planetary contribution is missing, while during an inferior conjunction (IC) the planetary atmosphere absorbs parts of the stellar signal. Analyzing the differences between those observations should reveal the planetary spectrum. We present results of an exploratory study to use adaptive optics-assisted integral field spectroscopy to obtain H- and K-band spectra of transiting Hot Jupiters and emphasize the importance of observing strategy and exact timing. We demonstrate how integral field spectroscopy compares with other spectroscopic techniques currently applied. We have tested our concept with time series observations of HD209458b during a superior conjunction and HD189733b during inferior conjunction obtained with SINFONI at the VLT at a spectral resolution of R = 1500.

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