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Estimating Magnetic Filling Factors From Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network
T. W. Milbourne, D. F. Phillips, N. Langellier +21
State of the art radial velocity (RV) exoplanet searches are limited by the effects of stellar magnetic activity. Magnetically active spots, plage, and network regions each have di…
Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum
A. Collier Cameron, A. Mortier, D. Phillips +33
The time-variable velocity fields of solar-type stars limit the precision of radial-velocity determinations of their planets' masses, obstructing detection of Earth twins. Since 20…
The Pseudosynchronization of Binary Stars Undergoing Strong Tidal Interactions
Mara Zimmerman, Susan Thompson, Fergal Mullally +3
Eccentric binaries known as heartbeat stars experience strong dynamical tides as the stars pass through periastron, providing a laboratory to study tidal interactions. We measure t…
Accelerated Tidal Circularization Via Resonance Locking in KIC 8164262
Jim Fuller, Kelly Hambleton, Avi Shporer +2
Tidal dissipation in binary star and planetary systems is poorly understood. Fortunately, eccentric binaries known as heartbeat stars often exhibit tidally excited oscillations, pr…
KIC 8164262: a Heartbeat Star Showing Tidally Induced Pulsations with Resonant Locking
K. Hambleton, J. Fuller, S. Thompson +8
We present the analysis of KIC 8164262, a heartbeat star with a high-amplitude (~1 mmag), tidally resonant pulsation (a mode in resonance with the orbit) at 229 times the orbital f…
KIC 3749404: A heartbeat Star with Rapid Apsidal Advance Indicative of a Tertiary Component
Kelly M. Hambleton, Donald W. Kurtz, Andrej Prsa +6
Heartbeat stars are eccentric (e > 0.2) ellipsoidal variables whose light curves resemble a cardiogram. We present the observations and corresponding model of KIC 3749404, a highly…