Bibcode
Burton, J. R.; Watson, C. A.; Rodríguez-Gil, P.; Skillen, I.; Littlefair, S. P.; Dhillon, S.; Pollacco, D.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 446, Issue 1, p.1071-1082
Fecha de publicación:
1
2015
Número de citas
18
Número de citas referidas
16
Descripción
We report on a pilot study of a novel observing technique, defocused
transmission spectroscopy, and its application to the study of exoplanet
atmospheres using ground-based platforms. Similar to defocused
photometry, defocused transmission spectroscopy has an added advantage
over normal spectroscopy in that it reduces systematic errors due to
flat-fielding, point spread function variations, slit-jaw imperfections
and other effects associated with ground-based observations. For one of
the planetary systems studied, WASP-12b, we report a tentative detection
of additional Na absorption of 0.12 ± 0.03[+0.03] per cent during
transit using a 2 Å wavelength mask. After consideration of a
systematic that occurs mid-transit, it is likely that the true depth is
actually closer to 0.15 per cent. This is a similar level of absorption
reported in the atmosphere of HD 209458b (0.135 ± 0.017 per cent;
Snellen et al. 2008). Finally, we outline methods that will improve the
technique during future observations, based on our findings from this
pilot study.
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