Monitoring the long-term radial velocity ( RV ) and acceleration of nearby stars has proven an effective method for directly detecting binary and substellar companions .
Some fraction of nearby RV trend systems are expected to be comprised of compact objects that likewise induce a systemic Doppler signal .
In this paper , we report the discovery of a white dwarf ( WD ) companion found to orbit the nearby ( \pi = 28.297 \pm 0.066 mas ) G9 V star HD 169889 .
High-contrast imaging observations using NIRC2 at Keck and LMIRCam at the LBT uncover the ( \Delta H = 9.76 \pm 0.16 , \Delta L ^ { \prime } = 9.60 \pm 0.03 ) companion at an angular separation of 0.8 ” ( 28 au ) .
Thirteen years of precise Doppler observations reveal a steep linear acceleration in RV time series and place a dynamical constraint on the companion mass of M \geq 0.369 \pm 0.010 M _ { \odot } .
This “ Sirius-like ” system adds to the census of WD companions suspected to be missing in the solar neighborhood .