Impact of Stellar Rotation on Detectability of Habitable Planets Around M Dwarfs

Stellar activity and rotation frustrate the detection of exoplanets through the radial velocity technique. This effect is particularly of concern for M dwarfs, which can remain magnetically active for billions of years.

We compile rotation periods for late-type stars and for the M dwarf planet-host sample in order to investigate the rotation periods of older field stars across the main sequence. We show that for stars with masses between 0.25 and 0.5 solar masses (M4V to M1V), the stellar rotation period typical of field stars coincides with the orbital periods of planets in the habitable zone. This will pose a fundamental challenge to the discovery and characterization of potentially habitable planets around early M dwarfs.

Due to the longer rotation periods reached by mid M dwarfs and the shorter orbital period at which the planetary habitable zone is found, stars with masses between 0.1 and 0.25 solar masses (M6V to M4V) offer better opportunities for the detection of habitable planets via radial velocities.

Elisabeth R. Newton, Jonathan Irwin, David Charbonneau, Zachory K. Berta-Thompson, Jason A. Dittmann
(Submitted on 11 Apr 2016)

Comments: Accepted to ApJ Letters 09 March 2016
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1604.03135 [astro-ph.EP] (or arXiv:1604.03135v1 [astro-ph.EP] for this version)
Submission history
From: Elisabeth Newton
[v1] Mon, 11 Apr 2016 20:17:25 GMT (76kb,D)
http://arxiv.org/abs/1604.03135

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