WASP-166b: a bloated super-Neptune transiting a V = 9 star

Abstract

We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 Mjup (1.9 Mnep) and a bloated radius of 0.63 Rjup. It transits a V = 9.36, F9V star in a 5.44-d orbit that is aligned with the stellar rotation axis (sky-projected obliquity angle lambda = 3 +/- 5 degrees). Variations in the radial-velocity measurements are likely the result of magnetic activity over a 12-d stellar rotation period. WASP-166b appears to be a rare object within the ``Neptune desert''.

Accepted by MNRAS

References in corpus (45)

• Gaia Data Release 2. Summary of the contents and survey properties
• The WASP Project and the SuperWASP Cameras
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field
• Helium in the eroding atmosphere of an exoplanet
• Dearth of short-period Neptunian exoplanets - a desert in period-mass and period-radius planes
• Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
• WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE
• Detection of transits of the nearby hot Neptune GJ 436 b
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• Photoevaporation and High-Eccentricity Migration Created the Sub-Jovian Desert
• Bayesian Analysis of Hot Jupiter Radius Anomalies: Evidence for Ohmic Dissipation?
• Improved Modeling of the Rossiter-McLaughlin Effect for Transiting Exoplanets
• The Oblique Orbit of the Super-Neptune HAT-P-11b
• Orbital misalignment of the Neptune-mass exoplanet GJ 436b with the spin of its cool star
• WASP-41b: A transiting hot Jupiter planet orbiting a magnetically-active G8V star
• HAT-P-26b: A Low-Density Neptune-Mass Planet Transiting a K Star
• WASP-42 b and WASP-49 b: two new transiting sub-Jupiters
• The discoveries of WASP-91b, WASP-105b and WASP-107b: two warm Jupiters and a planet in the transition region between ice giants and gas giants
• WASP-80b: a gas giant transiting a cool dwarf
• Water, High-Altitude Condensates, and Possible Methane Depletion in the Atmosphere of the Warm Super-Neptune WASP-107b
• Accurate spectroscopic parameters of WASP planet host stars
• The GTC exoplanet transit spectroscopy survey IX. Detection of Haze, Na, K, and Li in the super-Neptune WASP-127b
• Detection of Helium in the Atmosphere of the Exo-Neptune HAT-P-11b
• Four Sub-Saturns with Dissimilar Densities: Windows into Planetary Cores and Envelopes
• Transits and Occultations
• HARPS-N Solar Radial-Velocity Variations Are Dominated By Large, Bright Magnetic Regions
• WASP-South transiting exoplanets: WASP-130b, WASP-131b, WASP-132b, WASP-139b, WASP-140b, WASP-141b & WASP-142b
• From dense hot Jupiter to low-density Neptune: The discovery of WASP-127b, WASP-136b and WASP-138b
• Investigating hot-Jupiter inflated radii with hierarchical Bayesian modelling
• The HARPS search for southern extra-solar planets. XXXVI. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions
• Bayesian mass and age estimates for transiting exoplanet host stars
• The Oblique Orbit of WASP-107b from K2 Photometry
• WASP-64b and WASP-72b: two new transiting highly irradiated giant planets
• The discovery of WASP-151b, WASP-153b, WASP-156b: Insights on giant planet migration and the upper boundary of the Neptunian desert
• KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V=8 Subgiant HD 93396
• HATS-8b: A Low-Density Transiting Super-Neptune
• Starspots on WASP-107 and pulsations of WASP-118
• The K2-ESPRINT Project V: a short-period giant planet orbiting a subgiant star
• The CORALIE survey for southern extrasolar planets XVIII. Three new massive planets and two low mass brown dwarfs at separation larger than 5 AU
• A feature-rich transmission spectrum for WASP-127b
• Discovery of WASP-174b: Doppler tomography of a near-grazing transit
• The sub-Jovian desert of exoplanets: parameter dependent boundaries and implications on planet formation
• HATS-15 b and HATS-16 b: Two massive planets transiting old G dwarf stars
• HAT-P-47b AND HAT-P-48b: Two Low Density Sub-Saturn-Mass Transiting Planets on the Edge of the Period--Mass Desert

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• Stellar obliquities in exoplanetary systems
• A Preponderance of Perpendicular Planets
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• DREAM I. Orbital architecture orrery
• Tidal Inflation Reconciles Low-Density Sub-Saturns with Core Accretion
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• High-resolution transmission spectroscopy of four hot inflated gas giant exoplanets
• Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) V. Detection of sodium on the bloated super-Neptune WASP-166b
• WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b
• Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
• The Hot Neptune WASP-166 b with ESPRESSO II: Confirmation of atmospheric sodium
• The hot Neptune WASP-166 b with ESPRESSO III: A blue-shifted tentative water signal constrains the presence of clouds
• Can we detect the stellar differential rotation of WASP-7 through theRossiter-McLaughlin observations?
• HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert
• The Hot Neptune WASP-166~b with ESPRESSO I: Refining the Planetary Architecture and Stellar Variability
• VaTEST I: Validation of Sub-Saturn Exoplanet TOI-181b in Narrow Orbit from its Host Star
• Precise Transit Photometry Using TESS: Updated Physical Properties for 28 Exoplanets Around Bright Stars
• TOI-2498 b: A hot bloated super-Neptune within the Neptune desert
• Evidence for the Late Arrival of Hot Jupiters in Systems with High Host-star Obliquities