addition, compared to hotter stars M dwarfs present better conditions for the detection of planets orbiting the circumstellar habitable zone: less time consuming, larger Doppler signals, and an increased transit probability. @Sullivan2015 anticipated that from 556 small ($<$2R$_\oplus$) transiting planets discovered by TESS, 23% of them will be detected orbiting bright (K$_S<$9) stars, and that 75% of small planets will be found around M dwarfs.

This paper reports the discovery of a small planet orbiting the star L 168-9 (TOI-134), based on TESS data. The host star is a bright M dwarf. An intense precise radial-velocity campaign with HARPS and the Planet Finder Spectrograph (PFS) revealed the terrestrial nature of the newly detected world. This work is presented as follows: Section \[sec:L168-9\] describes the host star properties. Sections \[sec:phot\] and \[sec:rv\] describe the photometric and radial-velocity observations. Section \[sec:analysis\] presents an analysis of all the data, including the study of stellar activity. Finally, Section \[sec:conclusion\] places L 168-9 b within the larger context of the sample of detected planets.

L 168-9 {#sec:L168-9}
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[p[0.2]{}l c c c]{} Parameter & Units & Value & Reference\
R.A. & \[J2000\] & $23^h 20^m 07.52^s$ & Gaia2018\
Decl. & \[J2000\] & $-60\degree 03^\prime 54.64^{\prime\prime}$ 