Wasp-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit
@article{Anderson2009Wasp17bAU, title={Wasp-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit}, author={D. R. Anderson and Coel Hellier and Micha{\"e}l Gillon and Amaury H. M. J. Triaud and Barry Smalley and Leslie Hebb and Andrew Collier Cameron and P. F. L. Maxted and Didier Queloz and Richard G. West and Samuel J. Bentley and B. Enoch and Keith Horne and Tim Lister and Michel Mayor and N. R. Parley and Francesco A. Pepe and Don Pollacco and Damien S'egransan and St{\'e}phane Udry and D. Mark Wilson}, journal={The Astrophysical Journal}, year={2009}, volume={709}, pages={159-167} }
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…
Figures and Tables from this paper
151 Citations
Thermal emission at 4.5 and 8 μm of WASP-17b, an extremely large planet in a slightly eccentric orbit
- Geology, Physics
- 2011
We report the detection of thermal emission at 4.5 and 8 mu m from the planet WASP-17b. We used Spitzer to measure the system brightness at each wavelength during two occultations of the planet by…
WASP-25b: A 0.6M planet in the Southern hemisphere
- Geology, Physics
- 2010
The relationship of planetary radius to planetary equilibrium temperature and host star metallicity for transiting exoplanets with a similar mass to WASP-25b is investigated, finding that these two parameters explain the radii of most low-mass planets well.
WASP-23b: a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect
- Physics, Geology
- 2011
We report the discovery of a new transiting planet in the southern hemisphere. It was found by the WASP-south transit survey and confirmed photometrically and spectroscopically by the 1.2 m Swiss…
Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b
- Physics, Geology
- 2010
We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas…
Wasp-22 b: A transiting "hot jupiter" planet in a hierarchical triple system
- Physics, Geology
- 2010
High-resolution spectroscopy obtained with the CORALIE and HARPS spectrographs confirms the presence of a planetary mass companion with an orbital period of 3.533 days in a near-circular orbit in the star TYC 6446-326-1.
WASP-32b: A Transiting Hot Jupiter Planet Orbiting a Lithium-Poor, Solar-Type Star
- Physics, Geology
- 2010
ABSTRACT. We report the discovery of a transiting planet orbiting the star TYC 2-1155-1. The star, WASP-32, is a moderately bright (V = 11.3 V = 11.3 ) solar-type star (Teff = 6100 ± 100 K T eff =…
WASP-24?b: A New Transiting Close-in Hot Jupiter Orbiting a Late F-star
- Geology, Physics
- 2010
We report the discovery of a new transiting close-in giant planet, WASP-24 b, in a 2.341 day orbit, 0.037 AU from its F8-9 type host star. By matching the star's spectrum with theoretical models, we…
WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star
- Geology, Physics
- 2011
The discovery of WASP-39b is presented, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star, and the metallicity and temperatures are found to have an equilibrium temperature of 1116 +33 −32 K.
Discovery and Atmospheric Characterization of Giant Planet Kepler-12b: An Inflated Radius Outlier
- Physics, Geology
- 2011
We report the discovery of planet Kepler-12b (KOI-20), which at 1.695 ± 0.030 R_J is among the handful of planets with super-inflated radii above 1.65 R_J. Orbiting its slightly evolved G0 host with…
WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered
- Physics, Geology
- 2010
We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass M pl = 1.15 ± 0.08 MJ , radius R pl = 1.31 ± 0.06 RJ , and orbital period P =…
References
SHOWING 1-10 OF 79 REFERENCES
WASP-24?b: A New Transiting Close-in Hot Jupiter Orbiting a Late F-star
- Geology, Physics
- 2010
We report the discovery of a new transiting close-in giant planet, WASP-24 b, in a 2.341 day orbit, 0.037 AU from its F8-9 type host star. By matching the star's spectrum with theoretical models, we…
WASP-12b: The hottest transiting extrasolar planet yet discovered
- Physics, Geology
- 2008
The planet has an equilibrium temperature of T eq = 2516 K caused by its very short period orbit around the hot, twelfth magnitude host star and has the largest radius of any transiting planet yet detected.
WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered
- Physics, Geology
- 2010
We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass M pl = 1.15 ± 0.08 MJ , radius R pl = 1.31 ± 0.06 RJ , and orbital period P =…
WASP-3b: a strongly irradiated transiting gas-giant planet
- Geology, Physics
- 2007
The proximity and relative temperature of the host star suggests that WASP-3b is one of the hottest exoplanets known, and thus has the potential to place stringent constraints on exoplanet atmospheric models.
Detection of Planetary Transits Across a Sun-like Star.
- Physics, GeologyThe Astrophysical journal
- 2000
High-precision, high-cadence photometric measurements of the star HD 209458 are reported, which is known from radial velocity measurements to have a planetary-mass companion in a close orbit and the detailed shape of the transit curve due to both the limb darkening of thestar and the finite size of the planet is clearly evident.
TrES-4: A Transiting Hot Jupiter of Very Low Density
- Physics, Geology
- 2007
We report the discovery of TrES-4, a hot Jupiter that transits the star GSC 02620-00648 every 3.55 days. From high-resolution spectroscopy of the star, we estimate a stellar effective temperature of…
Misaligned spin-orbit in the XO-3 planetary system?
- Physics, Geology
- 2008
The transiting extrasolar planet XO-3b is remarkable, with a high mass and eccentric orbit. These unusual characteristics make it interesting to test whether its orbital plane is parallel to the…
Measurement of Spin-Orbit Alignment in an Extrasolar Planetary System
- Physics, Geology
- 2005
We determine the stellar, planetary, and orbital properties of the transiting planetary system HD 209458 through a joint analysis of high-precision radial velocities, photometry, and timing of the…
ON THE SPIN-ORBIT MISALIGNMENT OF THE XO-3 EXOPLANETARY SYSTEM
- Geology, Physics
- 2009
We present photometric and spectroscopic observations of the 2009 February 2 transit of the exoplanet XO-3b. The new data show that the planetary orbital axis and stellar rotation axis are…
Orbital migration of the planetary companion of 51 Pegasi to its present location
- Physics, GeologyNature
- 1996
THE recent discovery1 and confirmation2 of a possible planetary companion orbiting the solar-type star 51 Pegasi represent a breakthrough in the search for extrasolar planetary systems. Analysis of…