HD 148797 hosts two ~40 ME, ~8.3 RE, low-density savanna planets near a 1.619 period ratio whose anti-correlated TTVs yield masses and support compact multi-planet architectures as typical in the savanna.
Stellar Spin-Orbit Misalignment in a Multiplanet System
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abstract
Stars hosting hot Jupiters are often observed to have high obliquities, whereas stars with multiple co-planar planets have been seen to have low obliquities. This has been interpreted as evidence that hot-Jupiter formation is linked to dynamical disruption, as opposed to planet migration through a protoplanetary disk. We used asteroseismology to measure a large obliquity for Kepler-56, a red giant star hosting two transiting co-planar planets. These observations show that spin-orbit misalignments are not confined to hot-Jupiter systems. Misalignments in a broader class of systems had been predicted as a consequence of torques from wide-orbiting companions, and indeed radial-velocity measurements revealed a third companion in a wide orbit in the Kepler-56 system.
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HD 148797: A bright F-type star with two moderate-period low-density sub-Jovian planets. Compact multi-planet architectures are common in the Neptunian savanna
HD 148797 hosts two ~40 ME, ~8.3 RE, low-density savanna planets near a 1.619 period ratio whose anti-correlated TTVs yield masses and support compact multi-planet architectures as typical in the savanna.