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Radial velocity studies of cool stars

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Original languageEnglish
Article number20130088
Number of pages11
JournalPhilosophical transactions of the royal society a-Mathematical physical and engineering sciences
Journal publication date28 Apr 2014
Volume372
Issue2014
Early online date24 Mar 2014
DOIs
Publication statusPublished - 28 Apr 2014

Abstract

Our current view of exoplanets is one derived primarily from solar-like stars with a strong focus on understanding our Solar System. Our knowledge about the properties of exoplanets around the dominant stellar population by number, the so called low-mass stars or M dwarfs, is much more cursory. Based on radial velocity discoveries, we find that the semi-major axis distribution of M dwarf planets appears to be broadly similar to those around more massive stars and thus formation and migration processes might be similar to heavier stars. However, we find that the mass of M dwarf planets is relatively much lower than the expected mass dependency based on stellar mass and thus infer that planet formation efficiency around low-mass stars is relatively impaired. We consider techniques to overcome the practical issue of obtaining good quality radial velocity data for M dwarfs despite their faintness and sustained activity and emphasize (i) the wavelength sensitivity of radial velocity signals, (ii) the combination of radial velocity data from different experiments for robust detection of small amplitude signals, and (iii) the selection of targets and radial velocity interpretation of late-type M dwarfs should consider H alpha behaviour.

Notes

Hugh A. Jones; John Barnes; Mikko Tuomi; James S. Jenkins; and Guillem Anglada-Escude, 'Raial velocity studies of cool stars' Philosophical Transactions of the Royal Society A, Vol. 372 (2014), 20130088, first published 24 March 2014. The version of record is available at doi: 10.1098/rsta.2013.0088. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

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