OGLE-2013-BLG-0723L - A Venus-Mass Planet orbiting a Brown Dwarf in a Binary

A Venus-Mass Planet orbiting a Brown Dwarf
http://arxiv.org/abs/1507.02388

Quote :

The co-planarity of solar-system planets led Kant to suggest that they formed from an accretion disk, and the discovery of hundreds of such disks around young stars as well as hundreds of co-planar planetary systems by the {\it Kepler} satellite demonstrate that this formation mechanism is extremely widespread. Many moons in the solar system, such as the Galilean moons of Jupiter, also formed out of the accretion disks that coalesced into the giant planets. We report here the discovery of an intermediate system OGLE-2013-BLG-0723LB/Bb composed of a Venus-mass planet orbiting a brown dwarf, which may be viewed either as a scaled down version of a planet plus star or as a scaled up version of a moon plus planet orbiting a star. The latter analogy can be further extended since they orbit in the potential of a larger, stellar body. For ice-rock companions formed in the outer parts of accretion disks, like Uranus and Callisto, the scaled masses and separations of the three types of systems are similar, leading us to suggest that formation processes of companions within accretion disks around stars, brown dwarfs, and planets are similar.

Amazing! This is a real brown dwarf planet!

Lets try to detect transit

Good luck with the transit detection when the host hasn't been seen

Quite an interesting system, potentially a quadruple system, with the detected triple (star+(BD+planet)) potentially itself orbiting a brighter star. Sometimes the limits of microlensing are quite frustrating, would be nice to have a better handle on the orbital properties.

Without the distinction between a planet and a brown dwarf companion, this is the first system with a confirmed exomoon.

???
Have you something new about the system ?

Nothing. Just that 35Mj objects orbiting stars are more and more considered as planets and not brown dwarfs. In this ppoint of view, you have a 35Mj planet with an exomoon.

They want to persuade us that this is exomoon but is not

"they" who?

A better-fitting, less complex solution to the light curve has been found, where there is no need to invoke a planetary companion. The lensing system is more likely an M dwarf binary.
http://arxiv.org/abs/1604.06533

Well that's a pity. This was one of the more interesting systems.