J/A+A/600/L11 GTC transit light curves of WASP-52b (Chen+, 2017)
The GTC exoplanet transit spectroscopy survey.
VI. Detection of sodium in WASP-52b's cloudy atmosphere.
Chen G., Palle E., Nortmann L., Murgas F., Parviainen H., Nowak G.
<Astron. Astrophys. 600, L11 (2017)>
=2017A&A...600L..11C 2017A&A...600L..11C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Spectroscopy
Keywords: planetary systems - planets and satellites: individual: WASP-52b -
planets and satellites: atmospheres - techniques: spectroscopic
Abstract:
We report the first detection of sodium absorption in the atmosphere
of the hot Jupiter WASP-52b. We observed one transit of WASP-52b with
the low-resolution Optical System for Imaging and
low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the
10.4m Gran Telescopio Canarias (GTC). The resulting transmission
spectrum, covering the wavelength range from 522nm to 903nm, is flat
and featureless, except for the significant narrow absorption
signature at the sodium doublet, which can be explained by an
atmosphere in solar composition with clouds at 1 mbar. A cloud-free
atmosphere is stringently ruled out. By assessing the absorption
depths of sodium in various bin widths, we find that temperature
increases towards lower atmospheric pressure levels, with a positive
temperature gradient of 0.88±0.65K/km , possibly indicative of
upper atmospheric heating and a temperature inversion.
Description:
We provide here the transit light curves of the hot Jupiter WASP-52b
obtained on the night of 2015/08/28 using the OSIRIS instrument at the
10.4-m GTC telescope. The data was obtained by using OSIRIS through a
40-arcsec broad slit with the R1000R grism. The white-color light
curve covers the wavelength range of 515-905nm, with 755-765nm being
excluded. The spectroscopic light curves contain 22 channels of
16.5nm, 3 channels of 1.6nm, and 1 channel of 1.8nm. We provide
several auxiliary parameters of the observations, some of which we
have used to correct the data from correlated noise, including the
position drift of the stars on the CCD detector in spatial and
dispersion direction, the relative change in the FWHM of absorption
line (dispersion FWHM), seeing (spatial FWHM), air mass, and rotator
angle.
Objects:
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RA (2000) DE Designation(s)
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23 13 58.76 +08 45 40.6 WASP-52 = 2MASS J23135873+0845405
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 111 27 List of spectroscopic light curves
wlc.dat 93 308 WASP-52 GTC transit white light curve (2015/08/28)
lc/* . 26 Individual spectroscopic light curves
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See also:
J/A+A/563/A41 : WASP-43 OSIRIS transmission spectroscopy (Murgas+, 2014)
J/A+A/589/A62 : GTC transit light curves of CoRoT-29b (Palle+, 2016)
J/A+A/594/A65 : GTC transit light curves of HAT-P-32b (Nortmann+, 2016)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- FileName Name of the file with light curve data
10- 11 I2 --- ch ? Channel number (from table A1)
13- 16 I4 0.1nm lambdac ? Center wavelength (from table A1)
18- 20 I3 0.1nm Width ? Width of wavelength interval (from table A1)
22- 27 F6.4 --- Rp/R* ? Planet-to-star radius ratio (from table A1)
29- 34 F6.4 --- e_Rp/R* ? rms uncertainty on Rp/R* (from table A1)
36-111 A76 --- Title Title of the file
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Byte-by-byte Description of file: wlc.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD-TDB Barycentric Julian Date (TDB standard)
17- 24 F8.6 --- Flux Relative flux
26- 33 F8.6 --- e_Flux Uncertainty of relative flux
35- 43 F9.6 pix posX Drift of star on CCD in spatial direction
45- 53 F9.6 pix posY Drift of star on CCD in dispersion direction
55- 63 F9.6 pix FWHMx Relative change of full width at half maximum
of the stellar absorption line profile
65- 72 F8.6 pix FWHMY Full width at half maximum of the stellar
spatial profile
74- 81 F8.6 --- AirMass Airmass during observation
83- 93 F11.6 deg RotAng Rotator angle during observation
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 5 F5.1 nm Lambda1 Wavelength of the left border of the channel
7- 11 F5.1 nm Lambda2 Wavelength of the right border of the channel
13- 27 F15.7 d BJD-TDB Barycentric Julian Date (TDB standard)
29- 36 F8.6 --- Flux Relative flux
38- 45 F8.6 --- e_Flux Uncertainty of relative flux
47- 55 F9.6 pix posX Drift of star on CCD in spatial direction
57- 65 F9.6 pix posY Drift of star on CCD in dispersion direction
67- 75 F9.6 pix FWHMX Relative change of full width at half maximum
of the stellar absorption l ine profile
77- 84 F8.6 pix FWHMY Full width at half maximum of the stellar
spatial profile
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Acknowledgements:
Guo Chen, gchen(at)iac.es
References:
Murgas et al., Paper I, 2014A&A...563A..41M 2014A&A...563A..41M, Cat. J/A+A/563/A41
Parviainen et al., Paper II 2016A&A...585A.114P 2016A&A...585A.114P
Palle et al., Paper III 2016A&A...589A..62P 2016A&A...589A..62P, Cat. J/A+A/589/A62
Nortmann et al., Paper IV 2016A&A...594A..65N 2016A&A...594A..65N, Cat. J/A+A/594/A65
Chen et al., Paper V 2017A&A...600A.138C 2017A&A...600A.138C
(End) Patricia Vannier [CDS] 04-Apr-2017