J/ApJ/709/159 Relative Ic photometry of WASP-17 (Anderson+, 2010)
Wasp-17b: an ultra-low density planet in a probable retrograde orbit.
Anderson D.R., Hellier C., Gillon M., Triaud A.H.M.J., Smalley B., Hebb L.,
Cameron A.C., Maxted P.F.L., Queloz D., West R.G., Bentley S.J., Enoch B.,
Horne K., Lister T.A., Mayor M., Parley N.R., Pepe F., Pollacco D.,
Segransan D., Udry S., Wilson D.M.
<Astrophys. J., 709, 159-167 (2010)>
=2010ApJ...709..159A 2010ApJ...709..159A
ADC_Keywords: Photometry, RI ; Stars, double and multiple ; Stars, F-type ;
Planets
Keywords: planetary systems - stars: individual (WASP-17)
Abstract:
We report the discovery of the transiting giant planet WASP-17b, the
least-dense planet currently known. It is 1.6 Saturn masses, but 1.5-2
Jupiter radii, giving a density of 6%-14% that of Jupiter. WASP-17b is
in a 3.7 day orbit around a sub-solar metallicity, V=11.6, F6 star.
Preliminary detection of the Rossiter-McLaughlin effect suggests that
WASP-17b is in a retrograde orbit (λ~-150°), indicative of
a violent history involving planet-planet or star-planet scattering.
WASP-17b's bloated radius could be due to tidal heating resulting from
recent or ongoing tidal circularization of an eccentric orbit, such as
the highly eccentric orbits that typically result from scattering
interactions. It will thus be important to determine more precisely
the current orbital eccentricity by further high-precision radial
velocity measurements or by timing the secondary eclipse, both to
reduce the uncertainty on the planet's radius and to test
tidal-heating models. Owing to its low surface gravity, WASP-17b's
atmosphere has the largest scale height of any known planet, making it
a good target for transmission spectroscopy.
Description:
WASP-17 was observed by WASP-South (Pollacco et al.
2006PASP..118.1407P 2006PASP..118.1407P) from 2006 May 4 to August 18, again from 2007
March 5 to August 19 and again from 2008 March 2 to April 19.
A full transit of WASP-17 was observed in the Ic band with EulerCAM on
the 1.2m Euler-Swiss telescope on 2008 May 6. The Ic-band photometry
is given in table 1.
Objects:
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RA (2000) DE Designation(s) (Period)
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15 59 50.9 -28 03 42 WASP-17 = TYC 6787-1927-1 (P=3.7354417)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 32 181 Ic-band photometry of WASP-17
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See also:
J/A+A/524/A25 : Radial Velocities on 6 exoplanet host stars (Triaud+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date
16- 23 F8.6 --- RFlux Relative flux
25- 32 F8.6 --- e_RFlux The 1σ uncertainty in RFlux
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 23-Feb-2012