CaltechAUTHORS
  A Caltech Library Service

Water in the atmosphere of HD 209458b from 3.6–8 μm IRAC photometric observations in primary transit

Beaulieu, J. P. and Kipping, D. M. and Batista, V. and Tinetti, G. and Ribas, I. and Carey, S. and Noriega-Crespo, J. A. and Griffith, C. A. and Campanella, G. and Dong, S. and Tennyson, J. and Barber, R. J. and Deroo, P. and Fossey, S. J. and Liang, D. and Swain, M. R. and Yung, Y. and Allard, N. (2010) Water in the atmosphere of HD 209458b from 3.6–8 μm IRAC photometric observations in primary transit. Monthly Notices of the Royal Astronomical Society, 409 (3). pp. 963-974. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20110106-100201080

[img]
Preview
PDF - Published Version
See Usage Policy.

3220Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20110106-100201080

Abstract

The hot Jupiter HD 209458b was observed during primary transit at 3.6, 4.5, 5.8 and 8.0 μm using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We describe the procedures we adopted to correct for the systematic effects present in the IRAC data and the subsequent analysis. The light curves were fitted including limb-darkening effects and fitted using Markov Chain Monte Carlo and prayer-bead Monte Carlo techniques, obtaining almost identical results. The final depth measurements obtained by a combined Markov Chain Monte Carlo fit are at 3.6 μm, 1.469 ± 0.013 and 1.448 ± 0.013 per cent; at 4.5 μm, 1.478 ± 0.017 per cent; at 5.8 μm, 1.549 ± 0.015 per cent; and at 8.0 μm, 1.535 ± 0.011 per cent. Our results clearly indicate the presence of water in the planetary atmosphere. Our broad-band photometric measurements with IRAC prevent us from determining the additional presence of other molecules such as CO, CO_2 and methane for which spectroscopy is needed. While water vapour with a mixing ratio of 10^(-4) to 10^(-3) combined with thermal profiles retrieved from the day side may provide a very good fit to our observations, this data set alone is unable to resolve completely the degeneracy between water abundance and atmospheric thermal profile.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2010.16516.xDOIArticle
ORCID:
AuthorORCID
Carey, S.0000-0002-0221-6871
Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 February 10. Received 2010 February 3; in original form 2009 September 1. Article first published online: 17 Nov 2010. We are very grateful to Tommi Koskinen, Alan Aylward Steve Miller, Jean-Pierre Maillard and Giusi Micela for their insightful comments. GT is supported by a Royal Society University Research Fellowship; DMK by STFC; RJB by the Leverhulme Trust; GC by Ateneo Federato della Scienza e della Tecnologia – Universitá di Roma ‘La Sapienza’, Collegio univ. ‘Don N. Mazza’ and LLP-Erasmus Student Placement. We acknowledge the support by ANR-06-BLAN-0416 and the ‘Programme Origine des Planètes et de la Vie’. This paper is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Royal SocietyUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Leverhulme TrustUNSPECIFIED
Ateneo Federato della Scienza e della TecnologiaUNSPECIFIED
Agence Nationale pour la Recherche (ANR) ANR-06-BLAN-0416
Subject Keywords:techniques: photometric; occultations; planets and satellites: general; planetary systems
Record Number:CaltechAUTHORS:20110106-100201080
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110106-100201080
Official Citation:Beaulieu, J. P., Kipping, D. M., Batista, V., Tinetti, G., Ribas, I., Carey, S., Noriega-Crespo, J. A., Griffith, C. A., Campanella, G., Dong, S., Tennyson, J., Barber, R. J., Deroo, P., Fossey, S. J., Liang, D., Swain, M. R., Yung, Y. and Allard, N. (2010), Water in the atmosphere of HD 209458b from 3.6–8 μm IRAC photometric observations in primary transit. Monthly Notices of the Royal Astronomical Society, 409: 963–974. doi: 10.1111/j.1365-2966.2010.16516.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21622
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:06 Jan 2011 20:10
Last Modified:14 Nov 2017 21:56

Repository Staff Only: item control page