Kavli Affiliate: Bruce Macintosh
| First 5 Authors: Anne E. Peck, Anne E. Peck, , ,
| Summary:
HD~143811~AB is the host star to the directly imaged planet HD~143811~AB~b,
which was recently discovered using data from the Gemini Planet Imager and Keck
NIRC2. A member of the Sco-Cen star-forming region with an age of $13 pm 4$
Myr, HD~143811~AB is somewhat rare among hosts of directly imaged planets as it
is a close stellar binary, with an $sim$18 day period. Accurate values for the
orbital and stellar parameters of this binary are needed to understand the
formation and evolutionary history of the planet in orbit. We utilize archival
high-resolution spectroscopy from FEROS on the MPG/ESO 2.2-meter telescope to
fit the orbit of the binary, and combine with unresolved photometry to derive
the basic stellar properties of the system. From the orbit, we derive precise
values of orbital period of $18.59098 pm 0.00007$ days, and mass ratio of
$0.885 pm 0.003$. When combined with stellar evolutionary models, we find
masses of both components of $M_A = 1.30^+0.03_-0.05$ M$_odot$ and $M_B =
1.15^+0.03_-0.04$ M$_odot$. While the current data are consistent with the
planet and stellar orbits being coplanar, the 3D orientations of both systems
are currently poorly constrained, with additional observations required to more
rigorously test for coplanarity.
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