J/A+A/534/A16 WASP-22 and WASP-26 photometry and velocities (Anderson+, 2011)
Spin-orbit measurements and refined parameters for the exoplanet systems
WASP-22 and WASP-26.
Anderson D.R., Collier Cameron A., Gillon M., Hellier C., Jehin E.,
Lendl M., Queloz D., Smalley B., Triaud A.H.M.J., Vanhuysse M.
<Astron. Astrophys. 534, A16 (2011)>
=2011A&A...534A..16A 2011A&A...534A..16A
ADC_Keywords: Binaries, eclipsing ; Planets ; Radial velocities ; Photometry
Keywords: binaries: eclipsing - planetary systems -
stars: individual: WASP-22, WASP-26
Abstract:
We report on spectroscopic and photometric observations through
transits of the exoplanets WASP-22b and WASP-26b, intended to
determine the systems' spin-orbit angles. We combine these data with
existing data to refine the system parameters. We measure a
sky-projected spin-orbit angle of 22±16 degrees for WASP-22b,
showing the planet's orbit to be prograde and, perhaps, slightly
misaligned. We do not detect the Rossiter-McLaughlin effect of
WASP-26b due to its low amplitude and observation noise. We place
3-sigma upper limits on orbital eccentricity of 0.063 for WASP-22b and
0.050 for WASP-26b. After refining the drift in the systemic velocity
of WASP-22 found by Maxted et al. (2010AJ....140.2007M 2010AJ....140.2007M), we find the
third body in the system to have a separation-scaled minimum-mass of
5.3±0.3MJup (a3/5AU)2, where a3 is the orbital separation of the
third body.
Description:
Using the HARPS spectrograph on the ESO 3.6-m telescope (La Silla,
Chile), spectra of the planet host stars WASP-22 and WASP-26 were
obtained through transits of their close-in planets, as well as across
their orbits. The radial-velocity (RV) measurements extracted from the
spectra are presented here. RVs were re-extracted from the six HARPS
spectra of WASP-22 obtained by Maxted et al. (2010AJ....140.2007M 2010AJ....140.2007M)
after removal of the instrumental blaze function (Triaud et al. 2010,
Cat. J/A+A/524/A25) and are presented here.
Photometric transit observations of WASP-22 were obtained by the 0.6-m
TRAPPIST and 1.2-m Euler telescopes (both at La Silla). A transit of
WASP-26b was observed by the 0.35-m telescope at Oversky Observatory,
La Palma. The Oversky data were originally made available at the
Exoplanet Transit Database (http://var2.astro.cz/ETD/). The data are
plotted in Figures 1 and 2.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
03 31 16.3 -23 49 11 WASP-22 = TYC 6446-1326-1
00 18 24.7 -15 16 02 WASP-26 = TYC 5839-876-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot.dat 50 1550 *WASP-22 and WASP-26 dereddened and normalised
differential photometry from TRAPPIST, Euler
and Oversky
rv.dat 56 64 WASP-22 and WASP-26 radial velocities measured
by the HARPS spectrograph
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Note on phot.dat: In the second TRAPPIST transit of WASP-22, the meridian-flip
was performed after HJD=2455532.64930.
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See also:
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/A+A/530/A5 : WASP-4b Ks-band thermal emission detection (Caceres+, 2011)
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/A+A/517/L1 : Radial velocities of WASP-8b planet (Queloz+, 2010)
J/ApJ/692/L100 : Relative photometry of WASP-10 (Johnson+, 2009)
J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010)
J/A+A/519/A98 : Transit of exoplanet WASP-21b (Bouchy+, 2010)
J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)
J/A+A/526/L10 : Transits of WASP-33 (Herrero+, 2011)
J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)
J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)
J/A+A/531/A24 : WASP-23 photometric and radial velocity data (Triaud+ 2011)
J/A+A/531/A40 : Transits of WASP-39b (Faedi+, 2011)
J/A+A/531/A60 : WASP-31b photometry and radial velocities (Anderson+, 2011)
J/A+A/533/A88 : WASP-50b photometry and radial velocities (Gillon+, 2011)
J/A+A/524/A25 : Radial Velocities on 6 exoplanet host stars (Triaud+, 2010)
Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d HJD Heliocentric Julian Date (UTC)
15- 22 F8.6 --- RFlux Flux (relative)
24- 31 F8.6 --- e_RFlux Uncertainty on RFlux
33- 40 A8 --- Inst Instrument used (TRAPPIST, Euler or Oversky)
42- 48 A7 --- Star Star (WASP-22 or WASP-26)
50 I1 --- idx [1/5] Transit data-set index
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian Date (UTC)
16- 23 F8.5 km/s RV Radial velocity
25- 31 F7.5 km/s e_RV Radial velocity error
33- 39 F7.5 km/s FWHM Full width at half maximum of the
cross-correlation function (CCF)
41- 48 F8.5 km/s Span Bissector span velocity of the
cross-correlation function (CCF)
50- 56 A7 --- Star Star (WASP-22 or WASP-26)
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Acknowledgements:
David Anderson, dave.skunk(at)gmail.com
(End) Patricia Vannier [CDS] 16-Sep-2011