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Inflated Hot-Jupiters by the Half-Dozen

10 Jun 2016, 22:00 UTC
Inflated Hot-Jupiters by the Half-Dozen
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Figure 1: Artist’s impression of a transiting planet.Espinoza et al. (2016) present the discovery of six inflated hot-Jupiters identified as HATS-25b through HATS-30b. All six planets transit their host stars. The planets have masses between 0.5 to 0.7 times the mass of Jupiter, radii between 1.17 to 1.75 times the radius of Jupiter and orbital periods between 3.2 to 4.6 days. HATS-26b and HATS-27b stand out in having remarkably low densities of only 15.3 and 18.0 percent the density of water, respectively. All planets, with the exception of HATS-27b, appear to be good targets for future atmospheric characterisation. Nevertheless, HATS-27b is a good target for measuring the Rossiter-McLaughlin to determine its spin-orbit alignment due to the relatively high brightness and high stellar rotational velocity of its host star.Figure 2: Mass-radius diagram for all the transiting hot-Jupiters discovered to date (grey points). Red points indicate the discovered exoplanets presented in this work. The black lines show the mass-radius relations of 4.5 billion year old planets at 0.045 AU from the Sun for core-free giant planets (solid line) and for giant planets with 100 Earth-mass cores (dashed line), which are appropriate for the insolation levels received by HATS-25b, HATS-28b, HATS-29b and HATS-30b. ...

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