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10 papers · 1 filter
General Model for Light curves of Chromospherically Active Binary Stars
L. Jetsu, G. W. Henry, J. Lehtinen
The starspots on the surface of many chromospherically active binary stars concentrate on long--lived active longitudes separated by 180 degrees. The activity shifts between these…
A Catalog of Calibrator Stars for Next-Generation Optical Interferometers
Samuel J. Swihart, E. Victor Garcia, Keivan G. Stassun +3
Benchmark stars with known angular diameters are key to calibrating interferometric observations. With the advent of optical interferometry, there is a need for suitably bright, we…
Torsional oscillations and observed rotational period variations in early-type stars
J. Krticka, Z. Mikulasek, G. W. Henry +2
Some chemically peculiar stars in the upper main sequence show rotational period variations of unknown origin. We propose these variations are a consequence of the propagation of i…
Very Low-Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS VI: A Giant Planet and a Brown Dwarf Candidate in a Close Binary System HD 87646
Bo Ma, Jian Ge, Alex Wolszczan +34
We report the detections of a giant planet (MARVELS-7b) and a brown dwarf candidate (MARVELS-7c) around the primary star in the close binary system, HD 87646. It is the first close…
Three Temperate Neptunes Orbiting Nearby Stars
Benjamin J. Fulton, Andrew W. Howard, Lauren M. Weiss +17
We present the discovery of three modestly-irradiated, roughly Neptune-mass planets orbiting three nearby Solar-type stars. HD 42618 b has a minimum mass of M$_{\opl…
A combined spectroscopic and photometric stellar activity study of Epsilon Eridani
Matthew J. Giguere, Debra A. Fischer, Cyril X. Y. Zhang +3
We present simultaneous ground-based radial velocity (RV) measurements and space-based photometric measurements of the young and active K dwarf Epsilon Eridani. These measurements…