Probing the extreme planetary atmosphere of WASP-12b

Mark Swain, Pieter Deroo, Giovanna Tinetti, Morgan Hollis, Marcell Tessenyi, Michael Line, Hajime Kawahara, Yuka Fujii, Adam Showman, Sergey N. Yurchenko

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

We report near-infrared measurements of the terminator region transmission spectrum and dayside emission spectrum of the exoplanet WASP-12b obtained using the HST WFC3 instrument. The disk-average dayside brightness temperature averages about 2900. K, peaking to 3200. K around 1.46. μm. We modeled a range of atmospheric cases for both the emission and transmission spectrum and confirm the recent finding by Crossfield et al. (Crossfield, I., Barman, T., Hansen, B., Tanaka, I., Kodama, T. [2012b]. arXiv: 1210.4836C) that there is no evidence for C/O > 1 in the atmosphere of WASP-12b. Assuming a physically plausible atmosphere, we find evidence that the presence of a number of molecules is consistent with the data, but the justification for inclusion of these opacity sources based on the Bayesian Information Criterion (BIC) is marginal. We also find the near-infrared primary eclipse light curve is consistent with small amounts of prolate distortion. As part of the calibration effort for these data, we conducted a detailed study of instrument systematics using 65 orbits of WFC3-IR grims observations. The instrument systematics are dominated by detector-related affects, which vary significantly depending on the detector readout mode. The 256. ×. 256 subarray observations of WASP-12 produced spectral measurements within 15% of the photon-noise limit using a simple calibration approach. Residual systematics are estimated to be ≤70. ppm.

Original languageEnglish (US)
Pages (from-to)432-445
Number of pages14
JournalIcarus
Volume225
Issue number1
DOIs
StatePublished - Jul 2013

Fingerprint

planetary atmosphere
planetary atmospheres
near infrared
emission spectra
calibration
atmospheres
atmosphere
detectors
brightness temperature
eclipses
extrasolar planets
opacity
light curve
readout
inclusions
orbits
photons
molecules
detector

Keywords

  • Atmospheres, Composition
  • Eclipses
  • Extrasolar planets
  • Jovian planets
  • Spectroscopy

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Swain, M., Deroo, P., Tinetti, G., Hollis, M., Tessenyi, M., Line, M., ... Yurchenko, S. N. (2013). Probing the extreme planetary atmosphere of WASP-12b. Icarus, 225(1), 432-445. https://doi.org/10.1016/j.icarus.2013.04.003

Probing the extreme planetary atmosphere of WASP-12b. / Swain, Mark; Deroo, Pieter; Tinetti, Giovanna; Hollis, Morgan; Tessenyi, Marcell; Line, Michael; Kawahara, Hajime; Fujii, Yuka; Showman, Adam; Yurchenko, Sergey N.

In: Icarus, Vol. 225, No. 1, 07.2013, p. 432-445.

Research output: Contribution to journalArticle

Swain, M, Deroo, P, Tinetti, G, Hollis, M, Tessenyi, M, Line, M, Kawahara, H, Fujii, Y, Showman, A & Yurchenko, SN 2013, 'Probing the extreme planetary atmosphere of WASP-12b', Icarus, vol. 225, no. 1, pp. 432-445. https://doi.org/10.1016/j.icarus.2013.04.003
Swain M, Deroo P, Tinetti G, Hollis M, Tessenyi M, Line M et al. Probing the extreme planetary atmosphere of WASP-12b. Icarus. 2013 Jul;225(1):432-445. https://doi.org/10.1016/j.icarus.2013.04.003
Swain, Mark ; Deroo, Pieter ; Tinetti, Giovanna ; Hollis, Morgan ; Tessenyi, Marcell ; Line, Michael ; Kawahara, Hajime ; Fujii, Yuka ; Showman, Adam ; Yurchenko, Sergey N. / Probing the extreme planetary atmosphere of WASP-12b. In: Icarus. 2013 ; Vol. 225, No. 1. pp. 432-445.
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