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Stellar Spin-Orbit Alignment for Kepler-9, a Multi-transiting Planetary system with Two Outer Planets Near 2:1 Resonance
Songhu Wang, Brett Addison, Debra A. Fischer +4
We present spectroscopic measurements of the Rossiter-McLaughlin effect for the planet b of Kepler-9 multi-transiting planet system. The resulting sky-projected spin-orbit angle is…
Transiting Exoplanet Monitoring Project (TEMP). III. On the Relocation of the Kepler-9~b Transit
Songhu Wang, Dong-Hong Wu, Brett C. Addison +24
The Kepler-9 system harbors three known transiting planets. The system holds significant interest for several reasons. First, the outer two planets exhibit a period ratio that is c…
On the Consequences of the Detection of an Interstellar Asteroid
Gregory Laughlin, Konstantin Batygin
The arrival of the robustly hyperbolic asteroid A/2017 U1 has potentially interesting ramifications for the planet-formation process. Although extrapolations from a sample size of…
Kepler Multi-Planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius
Sarah Millholland, Songhu Wang, Gregory Laughlin
The widespread prevalence of close-in, nearly coplanar super-Earth- and sub-Neptune-sized planets in multiple-planet systems was one of the most surprising results from the Kepler…
A Six-Planet System Around the Star HD 34445
Steven S. Vogt, R. Paul Butler, Jennifer Burt +10
We present a new precision radial velocity dataset that reveals a multi-planet system orbiting the G0V star HD 34445. Our 18-year span consists of 333 precision radial velocity obs…
A Vorticity-Preserving Hydrodynamical Scheme for Modeling Accretion Disk Flows
Darryl Seligman, Gregory Laughlin
Vortices, turbulence, and unsteady non-laminar flows are likely both prominent and dynamically important features of astrophysical disks. Such strongly nonlinear phenomena are ofte…