The Hawaii Infrared Parallax Program. III. 2MASS J0249–0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the Pic Moving Group
AuthorDupuy, Trent J.
Liu, Michael C.
Allers, Katelyn N.
Biller, Beth A.
Kratter, Kaitlin M.
Mann, Andrew W.
Shkolnik, Evgenya L.
Kraus, Adam L.
Best, William M. J.
AffiliationUniv Arizona, Dept Astron
stars: individual (2MASS J02495639-0557352, 2MASSW J2208136+292121)
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationTrent J. Dupuy et al 2018 AJ 156 57
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractWe have discovered a wide planetary-mass companion to the beta Pic moving group member 2MASS J02495639-0557352 (M6 VL G) using Canada-France-Hawaii Telescope/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(-1.0)(+1.3) M-Jup object separated by 1950 +/- 200 au (40 '') from a relatively close (2.17 +/- 0.22 au, 0.'' 04) pair of 48(-12)(+13) M(Jup )and 44(-11)(+14) 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 +/- 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(-0.3)(+0.4)M(Jup)). We also find that the free-floating object 2MASS J2208+2921 (L3 VL-G) is another possible & nbsp;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.
VersionFinal published version
SponsorsGemini Observatory; NSF [AST-1518339, AST-1410174]; STFC [ST/J001422/1]; Hubble Fellowship - Space Telescope Science Institute ; NASA [NAS. 5-26555]; NASA/Habitable Worlds [NNX16AB62G]; National Aeronautics and Space Administration; University of Hawaii [NNH14CK55B]