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Register a new userDiscovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities
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Added by
Susana Cristina Cabral de Barros
Publication date
2016
fields
Physics
and research's language is
English
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We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP survey, {it SOPHIE} and {it CORALIE}. The planetary nature of the systems was established by performing follow-up photometric and spectroscopic observations. The follow-up data were combined with the WASP-photometry and analysed with an MCMC code to obtain system parameters. The host stars WASP-113 and WASP-114 are very similar. They are both early G-type stars with an effective temperature of $sim 5900,$K, [Fe/H]$sim 0.12$ and $T_{rm eff}$ $sim 4.1$dex. However, WASP-113 is older than WASP-114. Although the planetary companions have similar radii, WASP-114b is almost 4 times heavier than WASP-113b. WASP-113b has a mass of $0.48,$ $mathrm{M}_{rm Jup}$ and an orbital period of $sim 4.5,$days; WASP-114b has a mass of $1.77,$ $mathrm{M}_{rm Jup}$ and an orbital period of $sim 1.5,$days. Both planets have inflated radii, in particular WASP-113 with a radius anomaly of $Re=0.35$. The high scale height of WASP-113b ($sim 950$ km ) makes it a good target for follow-up atmospheric observations.
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We report the discovery of two transiting hot Jupiters, WASP-65b (M_pl = 1.55 +/- 0.16 M_J; R_pl = 1.11 +/- 0.06 R_J), and WASP-75b (M_pl = 1.07 +/- 0.05 M_J; R_pl = 1.27 +/- 0.05 R_J). They orbit their host star every 2.311, and 2.484 days, respectively. The planet host WASP-65 is a G6 star (T_eff = 5600 K, [Fe/H] = -0.07 +/- 0.07, age > 8 Gyr); WASP-75 is an F9 star (T_eff = 6100 K, [Fe/H] = 0.07 +/- 0.09, age of 3 Gyr). WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 M_J (rho_pl = 1.13 +/- 0.08 rho_J), a mass range where a large fraction of planets are found to be inflated with respect to theoretical planet models. WASP-65b is one of only a handful of planets with masses of around 1.5 M_J, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of Jupiter-mass WASP-75b is slightly inflated (< 10%) as compared to theoretical planet models with no core, and has a density similar to that of Saturn (rho_pl = 0.52 +/- 0.06 rho_J).
We report the discovery of two transiting exoplanets from the WASP survey, WASP-150b and WASP-176b. WASP-150b is an eccentric ($e$ = 0.38) hot Jupiter on a 5.6 day orbit around a $V$ = 12.03, F8 main-sequence host. The host star has a mass and radius of 1.4 $rm M_{odot}$ and 1.7 $rm R_{odot}$ respectively. WASP-150b has a mass and radius of 8.5 $rm M_J$ and 1.1 $rm R_J$, leading to a large planetary bulk density of 6.4 $rm rho_J$. WASP-150b is found to be $sim3$ Gyr old, well below its circularisation timescale, supporting the eccentric nature of the planet. WASP-176b is a hot Jupiter planet on a 3.9 day orbit around a $V$ = 12.01, F9 sub-giant host. The host star has a mass and radius of 1.3 $rm M_{odot}$ and 1.9 $rm R_{odot}$. WASP-176b has a mass and radius of 0.86 $rm M_J$ and 1.5 $rm R_J$ respectively, leading to a planetary bulk density of 0.23 $rm rho_J$.
We report on four new transiting hot Jupiters discovered by the WASP-South survey. WASP-178b transits a V = 9.9, A1V star with Teff = 9350 +/- 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 +/- 0.09 Rjup, in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 +/- 60 K, the planet is one of the best targets for studying ultra-hot Jupiters that is visible from the Southern hemisphere. The three host stars WASP-184, WASP-185 and WASP-192 are all post-main-sequence G0 stars of ages 4-8 Gyr. The larger stellar radii (1.3-1.7 Msun) mean that the transits are relatively shallow (0.7-0.9%) even though the planets have moderately inflated radii of 1.2-1.3 Rjup. WASP-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from WASP-185 and 4.4 mag fainter might be physically associated.
We report the discovery by WASP of five planets orbiting moderately bright ($V$ = 11.0-12.9) Solar-type stars. WASP-137b, WASP-143b and WASP-146b are typical hot Jupiters in orbits of 3-4 d and with masses in the range 0.68--1.11 $M_{rm Jup}$. WASP-134 is a metal-rich ([Fe/H] = +0.40 $pm$ 0.07]) G4 star orbited by two warm Jupiters: WASP-134b ($M_{rm pl}$ = 1.41 $M_{rm Jup}$; $P = 10.1$ d; $e = 0.15 pm 0.01$; $T_{rm eql}$ = 950 K) and WASP-134c ($M_{rm pl} sin i$ = 0.70 $M_{rm Jup}$; $P = 70.0$ d; $e = 0.17 pm 0.09$; $T_{rm eql}$ = 500 K). From observations of the Rossiter-McLaughlin effect of WASP-134b, we find its orbit to be misaligned with the spin of its star ($lambda = -44 pm 10^circ$). WASP-134 is a rare example of a system with a short-period giant planet and a nearby giant companion. In-situ formation or disc migration seem more likely explanations for such systems than does high-eccentricity migration.
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