Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.1206r&link_type=abstract
American Astronomical Society, ESS meeting #2, #12.06
Astronomy and Astrophysics
Astronomy
Scientific paper
We present transit and eclipse spectroscopy of Very Hot Jupiter atmospheres using the newly installed Wide Field Camera 3 (WFC3) spectrograph on the Hubble Space Telescope (HST). We include results from several hot Jupiter planets, but we focus particularly on spectra of WASP-4b in both transmission and emission, the first time this has been achieved using this instrument. These data are already in hand. Our preliminary analysis indicates they do not require substantial decorrelation against external measurements to correct for systematic errors, resulting in robust results that avoid the ambiguities in interpretation faced by earlier work with NICMOS. Recent work by Madhusudhan and Seager highlighted degeneracies in the interpretation of low-resolution Spitzer spectra of hot Jupiters. The G141 grism on WFC3 (1.1-1.7 microns) spans a 1.4 micron water feature, allowing us to constrain water vapor abundance and break this degeneracy. We measure the 1.5 micron continuum flux, which in conjunction with the Spitzer data allows us to constrain the thermal spectrum of the planet and obtain a more precise energy budget relevant to understanding WASP-4b’s abnormally large radius. This work is part of the Cycle-18 Large Program 12181, and we acknowledge support by NASA, NSF GRFP, and the HST Project.
Agol Eric
Burrows Adam
Charbonneau David
Clampin Marc
D'esert J.
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