Kavli Affiliate: Bruce A. Macintosh
| First 5 Authors: Nathalie K. Jones, Nathalie K. Jones, , ,
| Summary:
We present confirmation of HD 143811 AB b, a substellar companion to
spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet
Imager (GPI) and Keck NIRC2. HD 143811 AB was observed as a part of the Gemini
Planet Imager Exoplanet Survey (GPIES) in 2016 and 2019 and is a member of the
Sco-Cen star formation region. The companion object is detected $sim 430$ mas
from the host star by GPI. With two GPI epochs and one from Keck/NIRC2 in 2022,
we confirm through common proper motion analysis that the object is bound to
its host star. We derive an orbit with a semi-major axis of $64 ^+32_-14$
au and eccentricity $sim 0.23$. Spectral analysis of the GPI $H$-band spectrum
and NIRC2 textitL’ photometry provides additional proof that this object is
a substellar companion. We compare the spectrum of HD 143811 AB b to PHOENIX
stellar models and Exo-REM exoplanet atmosphere models and find that Exo-REM
models provide the best fits to the data. From the Exo-REM models, we derive an
effective temperature of $1042^+178_-132$ K for the planet and translate
the derived luminosity of the planet to a mass of $5.6 pm 1.1~M_textrmJup$
assuming hot-start evolutionary models. HD 143811 AB b is one of only a few
planets to be directly imaged around a binary, and future characterization of
this object will shed light on the formation of planets around binary star
systems.
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