- ID:
- ivo://CDS.VizieR/J/A+A/568/A81
- Title:
- WASP-117b photometry and radial velocities
- Short Name:
- J/A+A/568/A81
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- 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(+/- 0.0089)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)), P=10.02165(+/-0.00055)d orbit around a main-sequence F9 star. The host star's brightness (V=10.15mag) makes WASP-117 a good target for follow-up observations, and with a periastron planetary equilibrium temperature of T_eq_=1225(-39/+36)K and a low planetary mean 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=69.6(+4.7/-4.1){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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- ID:
- ivo://CDS.VizieR/J/A+A/533/A88
- Title:
- WASP-50b photometry and radial velocities
- Short Name:
- J/A+A/533/A88
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery by the WASP transit survey of a giant planet in a close orbit (0.0295+/-0.0009AU) around a moderately bright (V=11.6, K=10) G9 dwarf (0.89+/-0.08M_{sun}_, 0.84+/-0.03R_{sun}_) in the Southern constellation Eridanus. Thanks to high-precision follow-up photometry and spectroscopy obtained by the telescopes TRAPPIST and Euler, the mass and size of this planet, WASP-50 b, are well constrained to 1.47+/-0.09M_Jup_ and 1.15+/-0.05R_Jup_, respectively. The transit ephemeris is 2455558.6120(+/-0.0002)+Nx1.955096(+/-0.000005) HJD_UTC_. The size of the planet is consistent with basic models of irradiated giant planets.
- ID:
- ivo://CDS.VizieR/J/A+A/526/A130
- Title:
- WASP-34b photometry and radial velocities
- Short Name:
- J/A+A/526/A130
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of WASP-34b, a sub-Jupiter-mass exoplanet transiting its 10.4-magnitude solar-type host star (1SWASP J110135.89-235138.4; TYC 6636-540-1) every 4.3177 days in a slightly eccentric orbit (e=0.038+/-0.012). We find a planetary mass of 0.59+/-0.01M_Jup_ and radius of 1.22^+0.11^_-0.08_R_Jup. There is a linear trend in the radial velocities of 55+/-4m/s/y indicating the presence of a long-period third body in the system with a mass >0.45M_Jup_ at a distance of >1.2AU from the host star. This third-body is either a low-mass star, white dwarf, or another planet. The transit depth ((R_P/R_*)^2^=0.0126) and high impact parameter (b=0.90) suggest that this could be the first known transiting exoplanet expected to undergo grazing transits, but with a confidence of only ~80%.
- ID:
- ivo://CDS.VizieR/J/A+A/502/391
- Title:
- WASP-13b photometry and radial velocities
- Short Name:
- J/A+A/502/391
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of WASP-13b, a low-mass M_p_=0.46^+0.06^_-0.05_ M_J_ transiting exoplanet with an orbital period of 4.35298+/-0.00004days. The transit has a depth of 9mmag, and although our follow-up photometry does not allow us to constrain the impact parameter well (0<b<0.46), with radius in the range R_p_~1.06-1.21R_J_ the location of WASP-13b in the mass-radius plane is nevertheless consistent with H/He-dominated, irradiated, low core mass and core-free theoretical models. The G1V host star is similar to the Sun in mass M_*_=1.03^+0.11^_-0.09_M_{sun}_ and metallicity ([M/H]=0.0+/-0.2, but is possibly older (8.5^+5.5^_-4.9_Gyr).
- ID:
- ivo://CDS.VizieR/J/A+A/531/A60
- Title:
- WASP-31b photometry and radial velocities
- Short Name:
- J/A+A/531/A60
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of the low-density, transiting giant planet WASP-31b. The planet is 0.48 Jupiter masses and 1.55 Jupiter radii. It is in a 3.4-day orbit around a metal-poor, late-F-type, V=11.7 dwarf star, which is a member of a common proper motion pair. In terms of its low density, WASP-31b is second only to WASP-17b, which is a more highly irradiated planet of similar mass.
- ID:
- ivo://CDS.VizieR/J/A+A/562/L3
- Title:
- WASP-103b radial velocities and light curves
- Short Name:
- J/A+A/562/L3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of WASP-103 b, a new ultra-short-period planet (P=22.2h) transiting a 12.1 V-magnitude F8-type main-sequence star (1.22+/-0.04M_{sun}_, 1.44_-0.03_^+0.05^R_{sun}_, Teff=6110+/-160K). WASP-103 b is significantly more massive (1.49+/-0.09M_Jup_) and larger (1.53_-0.07_^+0.05^R_Jup_) than Jupiter. Its large size and extreme irradiation (~9x10^9^erg/s/cm2) make it an exquisite target for a thorough atmospheric characterization with existing facilities. Furthermore, its orbital distance is less than 20% larger than its Roche radius, meaning that it might be significantly distorted by tides and might experience mass loss through Roche-lobe overflow. It thus represents a new key object for understanding the last stage of the tidal evolution of hot Jupiters.
- ID:
- ivo://CDS.VizieR/J/A+A/520/A56
- Title:
- WASP-26b RV and photometric data
- Short Name:
- J/A+A/520/A56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of WASP-26b, a moderately over-sized Jupiter-mass exoplanet transiting its 11.3-mag early-G-type host star (1SWASP J001824.70-151602.3; TYC 5839-876-1) every 2.7566 days. A simultaneous fit to transit photometry and radial-velocity measurements yields a planetary mass of 1.02+/-0.03M_{Jup}_ and radius of 1.32+/-0.08R_{Jup}_. The host star, WASP-26, has a mass of 1.12+/-0.03 and a radius of 1.34+/-0.06 and is in a visual double with a fainter K-type star. The two stars are at least a common-proper motion pair with a common distance of around 250+/-15pc and an age of 6+/-2Gy.
- ID:
- ivo://CDS.VizieR/J/A+A/625/A80
- Title:
- WASP-121b secondary eclipse in 2MASS K band
- Short Name:
- J/A+A/625/A80
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Ground-based observations of the secondary eclipse in the 2MASS K band are presented for the hot Jupiter WASP-121b. These are the first occultation observations of an extrasolar planet that were carried out with an instrument attached to a 1m class telescope (the SMARTS 1.3m). We find a highly significant eclipse depth of (0.228+/-0.023)%. Together with other planet atmosphere measurements, including the Hubble Space Telescope near-infrared emission spectrum, current data support more involved atmosphere models with species producing emission and absorption features, rather than simple smooth blackbody emission. Analysis of the time difference between the primary and secondary eclipses and the durations of these events yields an eccentricity of e=0.0207+/-0.0153, which is consistent with the earlier estimates of low or zero eccentricity, but with a smaller error. Comparing the observed occultation depth in the K band with the one derived under the assumption of zero Bond albedo and full heat redistribution, we find that WASP-121b has a deeper observed occultation depth than predicted. Together with the sample of 31 systems with K-band occultation data, this observation lends further support to the idea of inefficient heat transport between the day and night sides for most of the hot Jupiters.
- ID:
- ivo://CDS.VizieR/J/A+A/553/A49
- Title:
- WASP-19b secondary eclipses
- Short Name:
- J/A+A/553/A49
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The ASTEP (Antarctica Search for Transiting ExoPlanets) program was originally aimed at probing the quality of the Dome C, Antarctica for the discovery and characterization of exoplanets by photometry. In the first year of operation of the 40cm ASTEP 400 telescope (austral winter 2010), we targeted the known transiting planet WASP-19b in order to try to detect its secondary transits in the visible. This is made possible by the excellent sub-millimagnitude precision of the binned data. The WASP-19 system was observed during 24 nights in May 2010. Once brought back from Antarctica, the data were processed using various methods, the best results were with an implementation of the optimal image subtraction (OIS) algorithm.
- ID:
- ivo://CDS.VizieR/J/A+A/623/A57
- Title:
- WASP-121 b Swift UVOT near-UV transit observations
- Short Name:
- J/A+A/623/A57
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Close-in gas planets are subject to continuous photoevaporation that can erode their volatile envelopes. Today, ongoing mass loss has been confirmed in a few individual systems via transit observations in the ultraviolet spectral range. We demonstrate that the Ultraviolet/Optical Telescope (UVOT) onboard the Neil Gehrels Swift Observatory enables photometry to a relative accuracy of about 0.5% and present the first near-UV (200-270nm, NUV) transit observations of WASP-121 b, a hot Jupiter with one of the highest predicted mass-loss rates. The data cover the orbital phases 0.85 to 1.15 with three visits. We measure a broad-band NUV transit depth of 2.10+/-0.29%. While still consistent with the optical value of 1.55%, the NUV data indicate excess absorption of 0.55% at a 1.9-sigma level. Such excess absorption is known from the WASP-12 system, and both of these hot Jupiters are expected to undergo mass loss at extremely high rates. With a CLOUDY simulation, we show that absorption lines of Fe II in a dense extended atmosphere can cause broad-band NUV absorption at the 0.5% level. Given the numerous lines of low-ionization metals, the NUV range is a promising tracer of photoevaporation in the hottest gas planets.
