• A Precise Radial Velocity Search for Giant Planets orbiting polluted White Dwarfs 

      Endl, M.; Williams, K.A. (2018-07)
      We present a feasibility study for extending the well-known radial velocity technique to search for planetary companions around white dwarfs. Typically, the spectra of white dwarfs contain only a few pressure-broadened ...
    • Magnetic Torques Imply Fewer Double Detonations 

      Neunteufel, P.; Yoon, S.C.; Langer, N. (2018-07)
      Binary systems composed of one helium-rich nondegenerate star and one carbon-oxygen white dwarf (He+CO) have long been considered a promising progenitor candidate for a number of astrophysical transients like archetypical ...
    • High-precision atomic physics laboratories in space: White dwarfs and subdwarfs 

      Landstorfer, A.; Löbling, L.; Rauch, T.; Werner, K.; Quinet, P. (2018-07)
      Stellar atmospheres are prime laboratories to determine atomic properties of highly ionized species. Reliable opacities are crucial ingredients for the calculation of stellar atmospheres of white dwarfs and subdwarfs. ...
    • Limits on mode coherence due to a non-static convection zone 

      Montgomery, M.H.; Hermes, J. J.; Winget, D.E. (2018-07)
      The standard theory of pulsations deals with the frequencies and growth rates of infinitesimal perturbations in a stellar model. Modes which are calculated to be linearly driven should increase their amplitudes ...
    • Constraining Low-Mass White Dwarf Binaries from Ellipsoidal Variations 

      Bell, K.J.; Hermes, J. J.; Kuszlewicz, J.S. (2018-07)
      Stars are stretched by tidal interactions in tight binaries, and changes to their projected areas introduce photometric variations twice per orbit. Hermes et al. (2014) utilized measurements of these ellipsoidal ...
    • Dusty Exoplanetary Debris Disks in the Single-Temperature Blackbody Plane 

      Dennihy, E.; Clemens, J. Christopher; Dunlap, B.H. (2018-07)
      We present a bulk sample analysis of the metal polluted white dwarfs which also host infrared bright dusty debris disks, known to be direct signatures of an active exoplanetary accretion source. We explore the relative ...
    • An Exploration of Spotted White Dwarfs from K2 

      Reding, Joshua S.; Hermes, J. J.; Clemens, J. Christopher (2018-07)
      The Kepler K2 mission has discovered a significant population of white dwarf stars that exhibit photometric variability due to surface inhomogeneities likely related to magnetism. These “spotted” white dwarfs present ...