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FORS2 observes a multi-epoch transmission spectrum of the hot Saturn-mass exoplanet WASP-49b | | M. Lendl
; L. Delrez
; M. Gillon
; N. Madhusudhan
; E. Jehin
; D.Queloz
; D.R. Anderson
; B.-O. Demory
; C. Hellier
; | | Date: |
21 Dec 2015 | | Abstract: | Context: Transmission spectroscopy has proven to be a useful tool for the
study of exoplanet atmospheres, and has lead to the detection of a small number
of elements and molecules (Na, K, H$_2$O), but also revealed that many planets
show flat transmission spectra consistent with the presence of opaque
high-altitude hazes or clouds.
Aims: We apply this technique to the $M_P=0.38 M_{jup}$, $R_p=1.12 R_{jup}$,
$P=2.78d$ planet WASP-49b, aiming to characterize its transmission spectrum
between 0.73 and 1 $mathrm{mu}$m and search for the features of K and H$_2$O.
Methods: Three transits of WASP-49b have been observed with the FORS2
instrument installed at the VLT/UT1 telescope at the ESO Paranal site. We used
FORS2’s MXU mode with grism GRIS_600z, producing simultaneous multi-wavelength
transit lightcurves throughout the i’ and z’ bands. We combined these data with
independent broadband photometry from the Euler and TRAPPIST telescopes to
obtain a good measurement of the transit shape. Strong correlated noise
structures are present in the FORS2 lightcurves due to rotating flat field
structures that are introduced by inhomogeneities of the linear atmospheric
dispersion corrector’s transparency. We account for these structures by
constructing common noise models from the residuals of lightcurves bearing the
same noise structures, and use these together with simple parametric models for
the inference of the transmission spectrum.
Results: We present three independent transmission spectra of WASP-49b
between 0.73 and 1.02 $mu m$, as well as a transmission spectrum between 0.65
and 1.02 $mu m$ from the combined analysis of FORS2 and broadband data. The
results obtained from the three individual epochs agree well. The transmission
spectrum of WASP-49b is best fit by atmospheric models containing a cloud deck
at pressure levels of 1 mbar or less. | | Source: | arXiv, 1512.6698 | | Services: | Forum | Review | PDF | Favorites | |
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