Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542121b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #421.21; Bulletin of the American Astronomical Society, Vol. 42, p.290
Astronomy and Astrophysics
Astronomy
Scientific paper
High-contrast, high-resolution spectroscopy from ground-based facilities can directly detect and characterize the atmospheres of close-in exoplanets. These measurements complement space-based direct detections by probing planets and spectral regions inaccessible to current space-based instruments. We use the NIRSPEC spectrometer on the Keck II telescope to obtain near-infrared spectra containing the blended light of a planet and its parent star, with signal-to-noise of several thousand. These observations target exoplanet spectral signatures in the 3-5 micron regime where the planet/star flux ratio is most favorable to ground based observations. We correct for strong, variable telluric absorption using a forward modeling approach that combines a line-by-line radiative transfer code for synthesizing the terrestrial atmosphere with observations of telluric standards and the target star itself. We disentangle the stellar and planet flux using a two-dimensional correlation analysis that allows us to compare an observed planet spectrum against a suite of different planet models. By combining planet detections from multiple epochs we can solve for the dynamical planet mass and characterize the atmosphere over the range of orbital phases. Here, we will describe our recent direct detection of the non-transiting Neptune mass exoplanet 55 Cancri E and show preliminary results from tau Bootis.
Barman Travis S.
Bender Chad F.
Carr John S.
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