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Updated Spitzer Emission Spectroscopy of Bright Transiting Hot Jupiter HD 189733b

Todorov, Kamen O. and Deming, Drake and Burrows, Adam and Grillmair, Carl J. (2014) Updated Spitzer Emission Spectroscopy of Bright Transiting Hot Jupiter HD 189733b. Astrophysical Journal, 796 (2). Art. No. 100. ISSN 0004-637X.

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We analyze all existing secondary eclipse time series spectroscopy of hot Jupiter HD 189733b acquired with the now defunct Spitzer/Infrared Spectrograph (IRS) instrument. We describe the novel approaches we develop to remove the systematic effects and extract accurate secondary eclipse depths as a function of wavelength in order to construct the emission spectrum of the exoplanet. We compare our results with a previous study by Grillmair et al. that did not examine all data sets available to us. We are able to confirm the detection of a water feature near 6 μm claimed by Grillmair et al. We compare the planetary emission spectrum to three model families—based on isothermal atmosphere, gray atmosphere, and two realizations of the complex radiative transfer model by Burrows et al., adopted in Grillmair et al.'s study. While we are able to reject the simple isothermal and gray models based on the data at the 97% level just from the IRS data, these rejections hinge on eclipses measured within a relatively narrow wavelength range, between 5.5 and 7 μm. This underscores the need for observational studies with broad wavelength coverage and high spectral resolution, in order to obtain robust information on exoplanet atmospheres.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Todorov, Kamen O.0000-0002-9276-8118
Deming, Drake0000-0001-5727-4094
Burrows, Adam0000-0002-3099-5024
Grillmair, Carl J.0000-0003-4072-169X
Additional Information:© 2014 The American Astronomical Society. Received 2014 April 3; accepted 2014 October 5; published 2014 November 12. We thank the Spitzer Science Center HelpDesk and Sean Carey for their valuable assistance in exploring alternatives for the correction of the systematic effects caused by the telescope pointing jitter. We thank David Charbonneau and Jonathan Fortney for valuable discussions. We thank the referee for the detailed review and many thoughtful suggestions. This work is based on observations made with the Spitzer Space Telescope, obtained from the NASA/IPAC Infrared Science Archive, both of which are operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Support for this work was provided by NASA through an award issued by JPL/ Caltech. This research has made use of NASA’s Astrophysics Data System. This research has made use of the Exoplanet Orbit Database and the Exoplanet Data Explorer at
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:eclipses; planetary systems; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20141219-141320468
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Official Citation:Updated Spitzer Emission Spectroscopy of Bright Transiting Hot Jupiter HD 189733b Kamen O. Todorov et al. 2014 ApJ 796 100
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53053
Deposited By: Tony Diaz
Deposited On:19 Dec 2014 23:40
Last Modified:03 Oct 2019 07:46

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