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KOI-730 as a System of Four Planets in a Chain of Resonances

KOI-730 as a System of Four Planets in a Chain of Resonances. Daniel Fabrycky UC Santa Cruz Matthew Holman, Joshua Carter, Jason Rowe, Darin Ragozzine, William Borucki, David Koch, and the Kepler Team. Planets in Resonance .

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KOI-730 as a System of Four Planets in a Chain of Resonances

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  1. KOI-730 as a System of Four Planets in a Chain of Resonances Daniel Fabrycky UC Santa Cruz Matthew Holman, Joshua Carter, Jason Rowe, Darin Ragozzine, William Borucki, David Koch, and the Kepler Team

  2. Planets in Resonance • Resonances are common among RV-discovered gas giants (~1 period commensurability in 3 multi systems: Wright et al. 2011, a 4:2:1 chain in GJ 876: Rivera et al. 2010) • Kepler has found Neptune-size pairs especially abundant near resonances (Lissauer et al. 2011) • Theories suggest the Solar System giants may have started in a resonant chain (Morbidelli et al. 2007, Thommes et al. 2008)

  3. KOI-730: Three Pairs of First-Order Resonances 3:4:6:8 P/P=1.33411(8) 4:3 P/P=1.50157(5) 3:2 P/P=1.33341(3) 4:3

  4. Laplace-type resonances • Involves 3 planets at once • Io, Europa, & Gaynmede obey λI-3λE+2λG=180°

  5. TTVs??

  6. P=7.3831 d dP/dE= -1±1 s P=9.8499 d dP/dE= 0±3 s • Theory: • Match P, T0 • coplanar • mass: • Mp = Rp2.06 • e = 0 Observed: transit times through Q8 P=14.7903 d dP/dE= 15±2 s relax P=19.7216 d dP/dE= -12±12 s

  7. Disk Migration Theory Lee & Peale 02 GJ 876 b/c • Rules-of-thumb for resonance capture: • Converging and slow • Low eccentricity favors first-order resonances • High eccentricity favors high-order resonances

  8. Capture into Resonance • first-order resonances • Laplace-type resonances • moderate eccentricities • increased stability

  9. KOI-730: • A candidate system of 4 low-mass planets on compact, resonant orbits • It informs migration models: limits the speed, direction, and damping properties • It’s the missing link to RV exoplanet systems, the Kepler multis, and maybe even the Solar System giants

  10. Coorbital no more KOI-730.03’s period was revised from 9.861 days to twice that: 19.722 days. This took it out of 1:1 resonance with KOI-730.02. This was apparent even in the Q1-Q2 data and is confirmed by the data through Q8.

  11. Stellar properties (determined by photometry, accounting for a blended companion, and fit to isochrones): Kp 15.3 mag

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