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Community Targets of JWST’s Early Release Science Program: Evaluation of WASP-63b

Kilpatrick, Brian M. and Cubillos, Patricio E. and Stevenson, Kevin B. and Lewis, Nikole K. and Wakeford, Hannah R. and MacDonald, Ryan J. and Madhusudhan, Nikku and Blecic, Jasmina and Bruno, Giovanni and Burrows, Adam and Deming, Drake and Heng, Kevin and Line, Michael R. and Morley, Caroline V. and Parmentier, Vivien and Tucker, Gregory S. and Valenti, Jeff A. and Waldmann, Ingo P. and Bean, Jacob L. and Beichman, Charles and Fraine, Jonathan and Krick, J. E. and Lothringer, Joshua D. and Mandell, Avi M. (2018) Community Targets of JWST’s Early Release Science Program: Evaluation of WASP-63b. Astronomical Journal, 156 (3). Art. No. 103. ISSN 1538-3881. doi:10.3847/1538-3881/aacea7.

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We present observations of WASP-63b by the Hubble Space Telescope (HST) as part of "A Preparatory Program to Identify the Single Best Transiting Exoplanet for James Webb Space Telescope (JWST) Early Release Science (ERS)." WASP-63b is one of the community targets under consideration for the JWST ERS program. We present a spectrum derived from a single observation by HST Wide Field Camera 3 in the near-infrared. We engaged groups across the transiting exoplanet community to participate in the analysis of the data and present results from each. Extraction of the transmission spectrum by several independent analyses find an H_2O absorption feature with varying degrees of significance ranging from 1σ to 3σ. The feature, in all cases, is muted in comparison to a clear atmosphere at solar composition. The reasons for the muting of this feature are ambiguous due to a degeneracy between clouds and composition. The data does not yield robust detections of any molecular species other than H_2O. The group was motivated to perform an additional set of retrieval exercises to investigate an apparent bump in the spectrum at ~1.55 μm. We explore possible disequilibrium chemistry and find this feature is consistent with super-solar HCN abundance but it is questionable if the required mixing ratio of HCN is chemically and physically plausible. The ultimate goal of this study is to vet WASP-63b as a potential community target to best demonstrate the capabilities and systematics of JWST instruments for transiting exoplanet science. In the case of WASP-63b, the presence of a detectable water feature indicates that WASP-63b remains a plausible target for JWST observations.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kilpatrick, Brian M.0000-0003-4220-600X
Cubillos, Patricio E.0000-0002-1347-2600
Stevenson, Kevin B.0000-0002-7352-7941
Lewis, Nikole K.0000-0002-8507-1304
Wakeford, Hannah R.0000-0003-4328-3867
MacDonald, Ryan J.0000-0003-4816-3469
Madhusudhan, Nikku0000-0002-4869-000X
Blecic, Jasmina0000-0002-0769-9614
Burrows, Adam0000-0002-3099-5024
Deming, Drake0000-0001-5727-4094
Heng, Kevin0000-0003-1907-5910
Line, Michael R.0000-0002-2338-476X
Morley, Caroline V.0000-0002-4404-0456
Parmentier, Vivien0000-0001-9521-6258
Tucker, Gregory S.0000-0002-6954-6947
Valenti, Jeff A.0000-0003-3305-6281
Waldmann, Ingo P.0000-0002-4205-5267
Bean, Jacob L.0000-0003-4733-6532
Beichman, Charles0000-0002-5627-5471
Fraine, Jonathan0000-0003-0910-5805
Lothringer, Joshua D.0000-0003-3667-8633
Mandell, Avi M.0000-0002-8119-3355
Additional Information:© 2018 The American Astronomical Society. Received 2017 April 24; revised 2018 June 15; accepted 2018 June 18; published 2018 August 17. This work is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-14642. B.M.K. acknowledges funding by HST-GO-14642.047 provided by the Space Telescope Science Institute. H.R.W. acknowledges support from the NASA Postdoctoral Program, administered by USRA through a contract with NASA. J.B. is supported by NASA trough the NASA ROSES-2016/Exoplanets Research Program, grant NNX17AC03G. The authors acknowledge the contributions and support from members of the transiting exoplanet community who have contributed to and/or supported Program GO-14642 including: E. Agol, D. Angerhausen, T. Barman, J. Barstow, N. M. Batalha, S. Birkman, D. Charbonneau, N. Cowan, N. Crouzet, S. Curry, J. M. Desert, D. Dragomir, J. Fortney, A. Garcia Munoz, N. Gibson, J. Gizis, T. Greene, J. Harrington, T. Kataria, E. Kempton, H. Knutson, L. Kreidberg, M. Lopez-Morales, M. Rocchetto, E. Schlawin, E. Shkolnik, A. Shporer, D. Sing, K. Todorov, and J. de Wit.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 5-26555
NASA Hubble FellowshipHST-GO-14642.047
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:atmospheric effects – planets and satellites: atmospheres – planets and satellites: individual (WASP- 63b) – techniques: spectroscopic
Issue or Number:3
Record Number:CaltechAUTHORS:20180820-090109662
Persistent URL:
Official Citation:Brian M. Kilpatrick et al 2018 AJ 156 103
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88947
Deposited By: Tony Diaz
Deposited On:20 Aug 2018 16:10
Last Modified:16 Nov 2021 00:31

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