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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 (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: -------------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------------- 23 13 58.76 +08 45 40.6 WASP-52 = 2MASS J23135873+0845405 -------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
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/* 84 26 Individual spectroscopic light curves
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: wlc.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: lc/*
Bytes Format Units Label Explanations
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
Acknowledgements: Guo Chen, gchen(at)iac.es References: Murgas et al., Paper I, 2014A&A...563A..41M, Cat. J/A+A/563/A41 Parviainen et al., Paper II 2016A&A...585A.114P Palle et al., Paper III 2016A&A...589A..62P, Cat. J/A+A/589/A62 Nortmann et al., Paper IV 2016A&A...594A..65N, Cat. J/A+A/594/A65 Chen et al., Paper V 2017A&A...600A.138C
(End) Patricia Vannier [CDS] 04-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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