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This paper introduces a series of papers aiming to study the dozens of lowmass eclipsing binaries (EBLM), with F, G, K primaries, that have beendiscovered in the course of the WASP survey. Our objects are mostly single-linebinaries whose eclipses have been detected by WASP and were initially followedup as potential planetary transit candidates. These have bright primaries,which facilitates spectroscopic observations during transit and allows thestudy of the spin-orbit distribution of F, G, K+M eclipsing binaries throughthe Rossiter-McLaughlin effect. Here we report on the spin-orbit angle ofWASP-30b, a transiting brown dwarf, and improve its orbital parameters. We alsopresent the mass, radius, spin-orbit angle and orbital parameters of a neweclipsing binary, J1219-39b (1SWAPJ121921.03-395125.6, TYC 7760-484-1), which,with a mass of 95 +/- 2 Mjup, is close to the limit between brown dwarfs andstars. We find that both objects orbit in planes that appear aligned with theirprimaries' equatorial planes. Neither primaries are synchronous. J1219-39b hasa modestly eccentric orbit and is in agreement with the theoreticalmass--radius relationship, whereas WASP-30b lies above it.

astronomy and astrophysics

The EBLM Project I-Physical and orbital parameters, including spin-orbit  angles, of two low-mass eclipsing binaries on opposite sides of the Brown  Dwarf limit