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A NIR spectrum of a hot Jupiter from the ground: Preliminary results

Published online by Cambridge University Press:  10 November 2011

Avi M. Mandell ,
L. Drake Deming ,
Geoffrey A. Blake ,
Heather A. Knutson ,
Michael J. Mumma ,
Geronimo L. Villanueva  and
Colette Salyk
Avi M. Mandell
Affiliation:
NASA GSFC, [email protected]
L. Drake Deming
Affiliation:
NASA GSFC, [email protected]
Geoffrey A. Blake
Affiliation:
Caltech
Heather A. Knutson
Affiliation:
UC Berkeley
Michael J. Mumma
Affiliation:
NASA GSFC, [email protected]
Geronimo L. Villanueva
Affiliation:
NASA GSFC, [email protected] Catholic University
Colette Salyk
Affiliation:
UT Austin
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Abstract

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High resolution NIR spectroscopy offers an excellent complement to the expanding dataset of transit and secondary eclipse observations of exo-planets with Spitzer that have provided the bulk of our understanding of the atmospheres and internal structure of these objects. High-resolution data can quantify the vertical temperature structure by isolating specific spectral lines formed at various depths. The presence of an opaque absorbing layer can also be inferred - and its pressure level determined quantitatively - via its effect on spectral line intensities.

We have analyzed data for a single secondary eclipse of the bright transiting exo-planet host star HD189733 at L-band wavelengths (3–4 μm) using the NIRSPEC instrument on Keck-II. We utilize a sophisticated first-order telluric absorption modeling technique that, combined with a calibration star, has already been proven to remove the effects of varying atmospheric transmittance and allow us to reach unprecedented S/N. We are conducting validation of the final data reduction products and developing high-resolution atmospheric models for comparison, but we have already been able to rule out emission from methane as reported by Swain et al. (2010). We present preliminary results and discuss future plans for analysis and observations.

Keywords

infrared: planetary systemsradiative transfertechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 158 - 162
Copyright
Copyright © International Astronomical Union 2011

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