Journal
ASTROPHYSICAL JOURNAL
Volume 766, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/766/1/7
Keywords
methods: data analysis; methods: observational; methods: statistical; planets and satellites: atmospheres; planets and satellites: individual (HD189733b); techniques: spectroscopic
Categories
Funding
- ERC [267219]
- STFC
- NERC
- UKSA
- UCL
- Royal Society
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- Science and Technology Facilities Council [ST/J001511/1, ST/K001612/1] Funding Source: researchfish
- STFC [ST/J001511/1, ST/K001612/1] Funding Source: UKRI
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Blind-source separation techniques are used to extract the transmission spectrum of the hot-Jupiter HD189733b recorded by the Hubble/NICMOS instrument. Such a blind analysis of the data is based on the concept of independent component analysis. The detrending of Hubble/NICMOS data using the sole assumption that nongaussian systematic noise is statistically independent from the desired light-curve signals is presented. By not assuming any prior or auxiliary information but the data themselves, it is shown that spectroscopic errors only about 10%-30% larger than parametric methods can be obtained for 11 spectral bins with bin sizes of similar to 0.09 mu m. This represents a reasonable trade-off between a higher degree of objectivity for the non-parametric methods and smaller standard errors for the parametric de-trending. Results are discussed in light of previous analyses published in the literature. The fact that three very different analysis techniques yield comparable spectra is a strong indication of the stability of these results.
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