SIMBAD references

2015ApJ...814...67A - Astrophys. J., 814, 67 (2015/November-3)

Spin-orbit misalignment of two-planet-system KOI-89 via gravity darkening.


Abstract (from CDS):

We constrain the true spin-orbit alignment of the KOI-89 system by numerically fitting the two Kepler photometric light curves produced by the transiting planets KOI-89.01 and KOI-89.02. The two planets have periods of 84.69 and 207.58 days, respectively. We find that the two bodies are low-density giant planets with radii of 0.45±0.03 Rjup and 0.43±0.05 Rjupand spin-orbit misalignments of 72°±3° and, respectively. Through dynamic stability tests, we demonstrate the general trend of higher system stability with the two planets close to mutual alignment and estimate their coalignment angle to 20°±20°–i.e., the planets are misaligned with the star but may be aligned with each other. From these results, we limit KOI-89's misalignment mechanisms to star-disk-binary interactions, disk warping via planet-disk interactions, planet-planet scattering, Kozai resonance, or internal gravity waves.

Abstract Copyright:

Journal keyword(s): planets and satellites: formation - planets and satellites: fundamental parameters - planets and satellites: individual: (KOI-89.01, KOI-89.02) - planets and satellites: physical evolution - techniques: photometric

Simbad objects: 11

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