Dynamical Mass Measurement of the Young Spectroscopic Binary V343 Normae AaAb Resolved With the Gemini Planet Imager

Eric L. Nielsen , Robert J. de Rosa , Jason Wang , Julien Rameau , Inseok Song , James R. Graham , Bruce Macintosh , Mark Ammons , Vanessa P. Bailey , Travis S. Barman , Joanna Bulger , Jeffrey K. Chilcote , Tara Cotten , Rene Doyon , Gaspard Duchêne (1) , Michael P. Fitzgerald , Katherine B. Follette , Alexandra Z. Greenbaum , Pascale Hibon , Li-Wei Hung , Patrick Ingraham , Paul Kalas , Quinn M. Konopacky , James E. Larkin , Jérôme Maire , Franck Marchis , Mark S. Marley , Christian Marois , Stanimir Metchev , Maxwell A. Millar-Blanchaer , Rebecca Oppenheimer , David W. Palmer , Jenny Patience , Marshall D. Perrin , Lisa A. Poyneer , Laurent Pueyo , Abhijith Rajan , Fredrik T. Rantakyrö , Dmitry Savransky , Adam C. Schneider , Anand Sivaramakrishnan , Remi Soummer , Sandrine Thomas , J. Kent Wallace , Kimberly Ward-Duong , Sloane J. Wiktorowicz , Schuyler G. Wolff

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

We present new spatially resolved astrometry and photometry from the Gemini Planet Imager of the inner binary of the young multiple star system V343 Normae, which is a member of the β Pictoris (β Pic) moving group. V343 Normae comprises a K0 and mid-M star in a ∼4.5 year orbit (AaAb) and a wide 10″ M5 companion (B). By combining these data with archival astrometry and radial velocities we fit the orbit and measure individual masses for both components of {M}_{Aa}=1.10+/- 0.10 {M}_⊙ and {M}_{Ab}=0.290+/- 0.018 {M}_⊙ . Comparing to theoretical isochrones, we find good agreement for the measured masses and JHK band magnitudes of the two components consistent with the age of the β Pic moving group. We derive a model-dependent age for the β Pic moving group of 26 ± 3 Myr by combining our results for V343 Normae with literature measurements for GJ 3305, which is another group member with resolved binary components and dynamical masses.

Keywords: planets and satellites: detection; stars: individual: V343 Nor; Astrophysics - Solar and Stellar Astrophysics

Domains: Sciences of the Universe [physics]

Eric L. Nielsen, Robert J. de Rosa, Jason Wang, Julien Rameau, Inseok Song, et al.. Dynamical Mass Measurement of the Young Spectroscopic Binary V343 Normae AaAb Resolved With the Gemini Planet Imager. The Astronomical Journal, 2016, 152, ⟨10.3847/0004-6256/152/6/175⟩. ⟨insu-03691474⟩