SuperWASP Results

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Re: SuperWASP Results

Post by Edasich on 9th February 2014, 5:02 am

Same or similar issue with XO-4 b, which has a 2008 arXiv preprint by McCullough but has never been published in any of the astrophysics journals. Rolling Eyes
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Re: SuperWASP Results

Post by Edasich on 10th March 2014, 5:48 am

WASP-85 (A)b - No preprint. Featuring in EPE in advance.

http://exoplanet.eu/catalog/wasp-85_b/
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Re: SuperWASP Results

Post by Sirius_Alpha on 26th June 2014, 8:33 pm

WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit
http://arxiv.org/abs/1406.6942

We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of M_p = 0.2755 (+/-0.0090) M_jup, a radius of R_p = 1.021 (-0.065 +0.076) R_jup and is in an eccentric (e = 0.302 +/-0.023), 10.02165 +/- 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V=10.15 mag) makes WASP-117 a good target for follow-up observations, and with a planetary equilibrium temperature of T_eq = 1024 (-26 +30) K and a low planetary density (rho_p = 0.259 (-0.048 +0.054) rho_jup) it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of beta = -44 (+/-11) deg, and we further derive an orbital obliquity of psi = 69.5 (+3.6 -3.1) deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days.

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Re: SuperWASP Results

Post by Sirius_Alpha on 5th August 2014, 8:57 pm

WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits
http://arxiv.org/abs/1408.0887

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Re: SuperWASP Results

Post by Sirius_Alpha on 13th October 2014, 8:29 pm

Six newly-discovered hot Jupiters transiting F/G stars: WASP-87b, WASP-108b, WASP-109b, WASP-110b, WASP-111b & WASP-112b
http://arxiv.org/abs/1410.3449

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Re: SuperWASP Results

Post by Sirius_Alpha on 19th October 2014, 2:33 am

The WASP Planets page is now listing planets up to WASP-134.
http://www.astro.keele.ac.uk/~ch/wasps.html

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Re: SuperWASP Results

Post by Edasich on 23rd October 2014, 2:23 am

Transit Timing Variations in WASP-28

TTVs analysis in Southern Stars: the case of WASP-28

We present 4 new transit observations of the exoplanet WASP-28b observed between August 2011 and October 2013. Employing another 11 transits available in the literature we compute new ephemeris and redetermine the physical parameters of the star and the exoplanet. Considering 3 yrs of observations, we find no periodic TTVs or long-term variations of the inclination of the orbit, i, or the depth of the transit, k, that could be attributable to the presence of another planetary mass-body in the system. We also study the relations between i and k with different factors that characterize the light-curves. The fits suggest a possible weak correlation between k with the red noise factor, \b{eta}, and the photometric noise rate, PNR, and a weak anticorrelation between i and PNR, although more points are needed to confirm these trends. Finally, the kinematic study suggests that WASP-28 is a thin disk star.
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Re: SuperWASP Results

Post by Lazarus on 23rd October 2014, 4:47 pm

Or rather, lack of TTV in WASP-28, which fits with the majority of hot Jupiter systems.

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Re: SuperWASP Results

Post by Sirius_Alpha on 23rd October 2014, 6:26 pm

Am I correct in thinking that we haven't had a firm detection of TTVs in any non-Kepler system?

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Re: SuperWASP Results

Post by Sirius_Alpha on 23rd October 2014, 8:29 pm

Three WASP-South transiting exoplanets: WASP-74b, WASP-83b & WASP-89b
http://arxiv.org/abs/1410.6358

We report the discovery of three new transiting hot Jupiters by WASP-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph.
WASP-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to Southern telescopes. It is a 0.95 M_Jup planet with a moderately bloated radius of 1.5 R_Jup in a 2-d orbit around a slightly evolved F9 star.
WASP-83b is a Saturn-mass planet at 0.3 M_Jup with a radius of 1.0 R_Jup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star.
WASP-89b is a 6 M_Jup planet in a 3-d orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas WASP-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 d, while star spots are visible in the transits. There are indications that the planet's orbit is aligned with the stellar spin. WASP-89 is a good target for an extensive study of transits of star spots.

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Re: SuperWASP Results

Post by Edasich on 24th October 2014, 3:24 am

So many WASP planets lately. Very Happy
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Re: SuperWASP Results

Post by Edasich on 30th December 2014, 5:11 am

Remember WASP-85 Ab? Discovery paper released Very Happy

Discovery of WASP-85Ab: a hot Jupiter in a visual binary system

We report the discovery of the transiting hot Jupiter exoplanet WASP-85Ab. Using a combined analysis of spectroscopic and photometric data, we determine that the planet orbits its host star every 2.66 days, and has a mass of 1.09+/-0.03 M_Jup and a radius of 1.44+/-0.02 R_Jup. The host star is of G5 spectral type, with magnitude V=11.2, and lies 125+/-80 pc distant. We find stellar parameters of T_eff=5685+/-65 K, super-solar metallicity ([Fe/H]=0.08+/-0.10), M_star=1.04+/-0.07 M_sun and R_star=0.96+/-0.13 R_sun. The system has a K-dwarf binary companion, WASP-85B, at a separation of approximately 1.5". The close proximity of this companion leads to contamination of our photometry, decreasing the apparent transit depth that we account for during our analysis. Without this correction, we find the depth to be 50 percent smaller, the stellar density to be 32 percent smaller, and the planet radius to be 18 percent smaller than the true value. Many of our radial velocity observations are also contaminated; these are disregarded when analysing the system in favour of the uncontaminated HARPS observations, as they have reduced semi-amplitudes that lead to underestimated planetary masses. We find a long-term trend in the binary position angle, indicating a misalignment between the binary and orbital planes. WASP observations of the system show variability with a period of 14.64 days, indicative of rotational modulation caused by stellar activity. Analysis of the Ca ii H+K lines shows strong emission that implies that both binary components are strongly active. We find that the system is likely to be less than a few Gyr old. WASP-85 lies in the field of view of K2 Campaign 1. Long cadence observations of the planet clearly show the planetary transits, along with the signature of stellar variability. Analysis of the K2 data, both long and short cadence, is ongoing.
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Re: SuperWASP Results

Post by Shellface on 30th December 2014, 1:14 pm

Ah, I guess they were waiting for the K2 campaign 1 data to reach the ground (which happened, like, last week).

And then they don't formally analyse it, electing to do that in a future paper. Alllllright then.

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Re: SuperWASP Results

Post by Edasich on 30th March 2015, 4:47 am

WASP-80b has a dayside within the T-dwarf range

WASP-80b is a missing link in the study of exo-atmospheres. It falls between the warm Neptunes and the hot Jupiters and is amenable for characterisation, thanks to its host star's properties. We observed the planet through transit and during occultation with Warm Spitzer. Combining our mid-infrared transits with optical time series, we find that the planet presents a transmission spectrum indistinguishable from a horizontal line. In emission, WASP-80b is the intrinsically faintest planet whose dayside flux has been detected in both the 3.6 and 4.5 μm Spitzer channels. The depths of the occultations reveal that WASP-80b is as bright and as red as a T4 dwarf, but that its temperature is cooler. If planets go through the equivalent of an L-T transition, our results would imply this happens at cooler temperatures than for brown dwarfs. Placing WASP-80b's dayside into a colour-magnitude diagram, it falls exactly at the junction between a blackbody model and the T-dwarf sequence; we cannot discern which of those two interpretations is the more likely. Flux measurements on other planets with similar equilibrium temperatures are required to establish whether irradiated gas giants, like brown dwarfs, transition between two spectral classes. An eventual detection of methane absorption in transmission would also help lift that degeneracy.
We obtained a second series of high-resolution spectra during transit, using HARPS. We reanalyse the Rossiter-McLaughlin effect. The data now favour an aligned orbital solution and a stellar rotation nearly three times slower than stellar line broadening implies. A contribution to stellar line broadening, maybe macroturbulence, is likely to have been underestimated for cool stars, whose rotations have therefore been systematically overestimated.
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Re: SuperWASP Results

Post by Edasich on 9th June 2015, 4:15 am

A lower-mass WASP-18 b's analogue, (apparently) in multiple system too.

WASP-121 b: a hot Jupiter in a polar orbit and close to tidal disruption

We present the discovery by the WASP-South survey, in close collaboration with the Euler and TRAPPIST telescopes, of WASP-121 b, a new remarkable short-period transiting hot Jupiter, whose planetary nature has been statistically validated by the PASTIS software. The planet has a mass of 1.183+0.064−0.062 MJup, a radius of 1.865 0.044 RJup, and transits every 1.2749255+0.0000020−0.0000025 days an active F6-type main-sequence star (V=10.4, 1.353+0.080−0.079 M⊙, 1.458 0.030 R⊙, Teff = 6460 140 K). A notable property of WASP-121 b is that its orbital semi-major axis is only ∼1.15 times larger than its Roche limit, which suggests that the planet might be close to tidal disruption. Furthermore, its large size and extreme irradiation (∼7.1109 erg s−1cm−2) make it an excellent target for atmospheric studies via secondary eclipse observations. Using the TRAPPIST telescope, we indeed detect its emission in the z′-band at better than ∼4σ, the measured occultation depth being 603 130 ppm. Finally, from a measurement of the Rossiter-McLaughlin effect with the CORALIE spectrograph, we infer a sky-projected spin-orbit angle of 257.8+5.3−5.5 deg. This result indicates a significant misalignment between the spin axis of the host star and the orbital plane of the planet, the planet being in a nearly polar orbit. Such a high misalignment suggests a migration of the planet involving strong dynamical events with a third body.
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Re: SuperWASP Results

Post by Sirius_Alpha on 12th June 2015, 5:41 pm

WASP-142b is a hot Jupiter discovered by a 15 yr old High School student.
http://www.space.com/29630-high-school-student-discovers-exoplanet.html

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Re: SuperWASP Results

Post by Shellface on 12th June 2015, 6:30 pm

English
high school student
drops tea in disgust

That artist's impression reminds me a lot of the ones for the planets discovered in the 90s, moon and all.

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Re: SuperWASP Results

Post by Sirius_Alpha on 12th June 2015, 8:06 pm

Yeah....
Maybe it's a fish-eye lens, and the hot Jupiter takes up half the sky, and the moon is a sort of Metis-type rock orbiting very, very close to the planet. I do vaguely recall reading that small "rocks" could exist in stable orbits around hot Jupiters. I concede that's a stretch, though.

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Re: SuperWASP Results

Post by Stalker on 1st July 2015, 11:14 am

No paper for this planet?

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Re: SuperWASP Results

Post by Lazarus on 1st July 2015, 3:20 pm

High School student
Secondary school, surely? Shame on you, Space.com.

Shellface wrote:That artist's impression reminds me a lot of the ones for the planets discovered in the 90s, moon and all.
Well it is by David A Hardy, who has a long history of space art and has been responsible for the art associated with a fair number of exoplanet press releases. I actually quite like it despite the non-photorealism, bit of a break from the raytraced stuff we usually see these days.
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Re: SuperWASP Results

Post by Sirius_Alpha on 8th September 2015, 9:56 pm

WASP-120, WASP-122 and WASP-123 http://arxiv.org/abs/1509.02210

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Re: SuperWASP Results

Post by Edasich on 19th November 2015, 4:56 am

WASP-135 b's served. Laughing

WASP-135b: a highly irradiated, inflated hot Jupiter orbiting a G5V star

We report the discovery of a new transiting planet from the WASP survey. WASP-135b is a hot Jupiter with a radius of 1.30 pm 0.09 Rjup, a mass of 1.90 pm 0.08 Mjup and an orbital period of 1.401 days. Its host is a Sun-like star, with a G5 spectral type and a mass and radius of 0.98 pm 0.06 Msun and 0.96 pm 0.05 Rsun respectively. The proximity of the planet to its host means that WASP-135b receives high levels of insolation, which may be the cause of its inflated radius. Additionally, we find weak evidence of a transfer of angular momentum from the planet to its star.
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Re: SuperWASP Results

Post by Sirius_Alpha on 6th February 2016, 10:07 am

Five transiting hot Jupiters discovered using WASP-South, Euler and TRAPPIST: WASP-119 b, WASP-124 b, WASP-126 b, WASP-129 b and WASP-133 b
http://arxiv.org/abs/1602.01740v1

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Re: SuperWASP Results

Post by Sirius_Alpha on 18th March 2016, 2:49 am

WASP-157b, a Transiting Hot Jupiter Observed with K2
http://arxiv.org/abs/1603.05638

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Re: SuperWASP Results

Post by Sirius_Alpha on 14th April 2016, 8:32 pm

WASP-130b, WASP-131b, WASP-132b, WASP-139b, WASP-140b, WASP-141b & WASP-142b
http://arxiv.org/abs/1604.04195

WASP-130b - 11.6 day period, longest yet found by WASP.
WASP-131b - Bloated hot Saturn.
WASP-132b - Among the least irradiated and coolest planets from WASP.
WASP-139b - Lowest-mass planet yet from WASP at 0.12 MJ.
WASP-140b - Grazing transit and eccentric orbit.
WASP-141b and WASP-142b are more "typical" hot Jupiters.

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Re: SuperWASP Results

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