A simple model to describe intrinsic stellar noise for exoplanet detection around red giants

Research output: Contribution to journalArticle

Authors

  • T.~S.~H. North
  • R.~L. Gilliland
  • D. Huber
  • D. Veras
  • J.~S. Kuszlewicz

Abstract

In spite of the huge advances in exoplanet research provided by the NASA Kepler Mission, there remain only a small number of transit detections around evolved stars.
Here we present a reformulation of the noise properties of red-giant stars, where the intrinsic stellar granulation, and the stellar oscillations described by asteroseismology play a key role. The new noise model is a significant improvement on the current Kepler results for evolved stars. Our noise model may be used to help understand planet detection thresholds for the ongoing K2 and upcoming TESS missions, and serve as a predictor of stellar noise for these missions. As an application of our noise model, we explore the minimum detectable planet radii for red giant stars, and find that Neptune sized planets should be detectable around low luminosity red giant branch stars.

Details

Original languageEnglish
Pages (from-to)1308-1315
JournalRoyal Astronomical Society. Monthly Notices
Volume465
Issue number2
Early online date28 Oct 2016
Publication statusPublished - Feb 2017

Keywords

  • Astrophysics, Solar and Stellar Astrophysics, Astrophysics, Earth and Planetary Astrophysics