2MASS J02495639-0557352 c - Wide planetary mass companion in Bet Pic moving group

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2MASS J02495639-0557352 c - Wide planetary mass companion in Bet Pic moving group

Post by Sirius_Alpha on 16th July 2018, 9:02 pm

The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the beta Pic Moving Group
https://arxiv.org/abs/1807.05235

We have discovered a wide planetary-mass companion to the β Pic moving group member 2MASSJ02495639-0557352 (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, 2MASSJ0249-0557ABc is a bound triple system with an 11.6+1.0−1.3 MJup object separated by 1950±200 AU (40") from a relatively close (2.17±0.22 AU, 0.04") pair of 48+12−13 MJup and 44+11−14 MJup objects. 2MASSJ0249-0557AB is one of the few ultracool binaries to be discovered in a young moving group and the first confirmed in the β Pic moving group (22±6 Myr). The mass, absolute magnitudes, and spectral type of 2MASSJ0249-0557 c (L2 VL-G) are remarkably similar to those of the planet β Pic b (L2, 13.0+0.4−0.3 MJup). We also find that the free-floating object 2MASSJ2208+2921 (L3 VL-G) is another possible β Pic moving group member with colors and absolute magnitudes similar to β Pic b and 2MASSJ0249-0557 c. β 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.

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Re: 2MASS J02495639-0557352 c - Wide planetary mass companion in Bet Pic moving group

Post by Led_Zep on 16th July 2018, 11:36 pm

http://www.ifa.hawaii.edu/info/press-releases/doppelganger/

Astronomers Find a Famous Exoplanet's Doppelgänger
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