J/A+A/608/A135 Sodium detection in WASP-69b atmosphere (Casasayas-Barris+, 2017)
Detection of sodium in the atmosphere of WASP-69b.
Casasayas-Barris N., Palle E., Nowak G., Yan F., Nortmann L., Murgas F.
<Astron. Astrophys. 608, A135 (2017)>
=2017A&A...608A.135C 2017A&A...608A.135C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Spectroscopy
Keywords: planetary systems - planets and satellites: individual: WASP-69b -
planets and satellites: individual: HD189733b -
planets and satellites: atmospheres - methods: observational -
techniques: spectroscopic
Abstract:
We analyze the transmission spectrum around the Na I doublet at 589nm
of the extrasolar planet WASP-69b, and compare the analysis to that of
the well-know hot Jupiter HD 189733b. We also present the analysis of
the Rossiter-McLaughlin (RM) effect for WASP-69b. We observed two
transits of WASP-69b with the HARPS-North spectrograph (R=115 000) at
the TNG telescope. We perform a telluric contamination subtraction
based on the comparison between the observed spectra and a telluric
water model. Then, the common steps of the differential spectroscopy
are followed to extract the transmission spectrum. The method is
tested with archival transit data of the extensively studied exoplanet
HD 189733b, obtained with the HARPS-South spectrograph at ESO 3.6m
telescope, and then applied to WASP-69b data. For HD 189733b, we
spectrally resolve the NaI doublet and measure line contrasts of
0.72±0.05% (D2) and 0.51±0.05% (D1), and FWHMs of 0.64±0.04Å (D2)
and 0.60±0.06Å (D1), in agreement with previously published results.
For WASP-69b only the contrast of the D2 line can be measured
(5.8±0.3%). This corresponds to a detection at the 5sigma-level of
excess absorption of 0.5±0.1% in a passband of 1.5Å. By measuring the
RM effect, we get an angular rotation of 0.24+0.02-0.01rad/day and
a sky-projected angle between the stellar rotation axis and the normal
of orbit plane of 0.4+2.0-1.9° FOR wasP-69b. Similar results to
those previously presented in the literature are obtained for the RM
analysis of HD 189733b.
Description:
The transmission spectra and (spectro-)photometric light curves of
WASP-69b and HD 189733b are presented. Two transits of WASP-69b with
HARPS-North at TNG telescope were retrieved and three transit archival
data of HD189733b using HARPS at the 3.6m La Silla telescope were
used. For each planet the transmission spectrum and the
(spectro-)photometric light curves for 0.75, 1.5 and 3.0 Angstroem
passbands are given.
Objects:
-----------------------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------------------
21 00 06.19 -05 05 40.1 WASP-69b = WASP-69b
20 00 43.71 +22 42 39.1 HD189733b = HD 189733b
-----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tsw69b.dat 36 3510 Transmission spectrum of WASP-69b
tshd189b.dat 36 3510 Transmission spectrum of HD189733b
lcw69b.dat 70 10 Spectro-photometric light curves of WASP-69b
lchd189b.dat 70 36 Spectro-photometric light curves of HD189733b
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tshd189b.dat tsw69b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 0.1nm lambda Wavelength in Angstroem
9- 22 E14.8 % RFlux Relative Flux in % (1)
24- 36 E13.8 % e_RFlux Error on RFlux
--------------------------------------------------------------------------------
Note (1): The final transmission spectrum (F) is the result of a ratio between
spectra. We present the data in % with the continuum in the 0 level by
applying (F-1.0)*100[%].
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lchd189b.dat lcw69b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.7 --- Phase Orbital phase
12- 20 F9.7 --- RFlux075 Relative Flux in a 0.75 Angstroem passband (1)
22- 30 F9.7 --- e_RFlux075 Errors for a 0.75A passband
32- 40 F9.7 --- RFlux150 Relative Flux in a 1.50 Angstroem passband (1)
42- 50 F9.7 --- e_RFlux150 Errors for a 1.50A passband
52- 60 F9.7 --- RFlux300 Relative Flux in a 3.0 Angstroem passband (1)
62- 70 F9.7 --- e_RFlux300 Errors for a 3.0A passband
--------------------------------------------------------------------------------
Note (1): The flux values are the result of ratios between spectra.
The presented values are normalized to 1.
--------------------------------------------------------------------------------
Acknowledgements:
Nuria Casasayas-Barris, nuracb(at)iac.es
(End) Nuria Casasayas-Barris [IAC, Spain], Patricia Vannier [CDS] 23-Oct-2017