Prized results from HARPS. Low-mass/habitable/transiting planets orbiting M dwarfs

X. Bonfils, F. Bouchy, X. Delfosse, T. Forveille, M. Gillon, C. Lovis, M. Mayor, V. Neves, F. Pepe, C. Perrier, D. Queloz, N. C. Santos, D. Ségransan, S. Udry

Resumo
Searching for planets around stars with different masses probes the outcome of planetary formation for different initial conditions. The low-mass M dwarfs are also the most frequent stars in our Galaxy and potentially therefore, the most frequent planet hosts. This has motivated our search for planets around M dwarfs with HARPS. That observing program has now run for almost a decade and detected most of the known low-mass planets orbiting M dwarfs (m sin i < 20 M_⊕), including the least massive (GJ581e, msini = 1.9 M_⊕) and the first potentially habitable planets (GJ581c&d GJ667Cc, GJ163c). This proceeding shortly reviews the detections made with HARPS, reports on the occurrence of planets around M dwarfs and how they mesh up with planet formation theory. It also highlights our sensitivity to low-mass habitable planets, the first direct measure of η_⊕, and the recent detection of a transiting planet the size of Uranus.

Hot Planets and Cool Stars
(Eds.) R. Saglia

EDP Sciences
Vol. 47, Página 05004
2013

>> PDF>> ADS>> DOI