We have discovered a wide planetary-mass companion to the \beta Pic moving group member 2MASS J02495639 - 0557352 ( M6 vl-g ) using CFHT/WIRCam astrometry from the Hawaii Infrared Parallax Program .
In addition , Keck laser guide star adaptive optics aperture-masking interferometry shows that the host is itself a tight binary .
Altogether , 2MASS J0249 - 0557ABc is a bound triple system with an 11.6 ^ { +1.3 } _ { -1.0 } M _ { Jup } object separated by 1950 \pm 200 AU ( 40″ ) from a relatively close ( 2.17 \pm 0.22 AU , 0 \farcs 04 ) pair of 48 ^ { +13 } _ { -12 } M _ { Jup } and 44 ^ { +14 } _ { -11 } M _ { Jup } objects .
2MASS J0249 - 0557AB is one of the few ultracool binaries to be discovered in a young moving group and the first confirmed in the \beta Pic moving group ( 22 \pm 6 Myr ) .
The mass , absolute magnitudes , and spectral type of 2MASS J0249 - 0557 c ( L2 vl-g ) are remarkably similar to those of the planet \beta Pic b ( L2 , 13.0 ^ { +0.4 } _ { -0.3 } M _ { Jup } ) .
We also find that the free-floating object 2MASS J2208+2921 ( L3 vl-g ) is another possible \beta Pic moving group member with colors and absolute magnitudes similar to \beta Pic b and 2MASS J0249 - 0557 c . \beta Pic b is the first directly imaged planet to have a “ twin , ” namely an object of comparable properties in the same stellar association .
Such directly imaged objects provide a unique opportunity to measure atmospheric composition , variability , and rotation across different pathways of assembling planetary-mass objects from the same natal material .