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Title:
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
Authors:
Dupuy, 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.
Affiliation:
AA(Gemini Observatory, Northern Operations Center, 670 N. A'ohoku Place, Hilo, HI 96720, USA 0000-0001-9823-1445), AB(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 0000-0003-2232-7664), AC(Department of Physics and Astronomy, Bucknell University, Lewisburg, PA 17837, USA ; 0000-0003-0580-7244), AD(SUPA Institute for Astronomy, University of Edinburgh, Blackford Hill View, Edinburgh EH9 3HJ, UK ; Centre for Exoplanet Science, University of Edinburgh, UK ; 0000-0003-4614-7035), AE(Department of Astronomy, University of Arizona, 933 N Cherry Ave, Tucson, AZ 85721, USA 0000-0001-5253-1338), AF(Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA ; 0000-0003-3654-1602), AG(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85281, USA 0000-0002-7260-5821), AH(The University of Texas at Austin, Department of Astronomy, 2515 Speedway C1400, Austin, TX 78712, USA 0000-0001-9811-568X), AI(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 0000-0003-0562-1511)
Publication:
The Astronomical Journal, Volume 156, Issue 2, article id. 57, 21 pp. (2018). (AJ Homepage)
Publication Date:
08/2018
Origin:
IOP
Astronomy Keywords:
binaries: close, brown dwarfs, parallaxes, planetary systems, stars: individual: 2MASS J02495639-0557352, 2MASSW J2208136+292121
DOI:
10.3847/1538-3881/aacbc2
Bibliographic Code:
2018AJ....156...57D

Abstract

We 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 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.
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