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HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent andcomplex circumstellar disk, likely still in a transition stage fromprotoplanetary to debris disk phase. Here, we present a new image of the thirdinner disk component of HD 141569 A made in the L' band (3.8 micron) during thecommissioning of the vector vortex coronagraph recently installed in thenear-infrared imager and spectrograph NIRC2 behind the W.M. Keck ObservatoryKeck II adaptive optics system. We used reference point spread functionsubtraction, which reveals the innermost disk component from the inner workingdistance of $\simeq 23$ AU and up to $\simeq 70$ AU. The spatial scale of ourdetection roughly corresponds to the optical and near-infrared scattered light,thermal Q, N and 8.6 micron PAH emission reported earlier. We also see anoutward progression in dust location from the L'-band to the H-band (VLT/SPHEREimage) to the visible (HST/STIS image), likely indicative of dust blowout. Thewarm disk component is nested deep inside the two outer belts imaged by HSTNICMOS in 1999 (respectively at 406 and 245 AU). We fit our new L'-band imageand spectral energy distribution of HD 141569 A with the radiative transfercode MCFOST. Our best-fit models favor pure olivine grains, and are consistentwith the composition of the outer belts. While our image shows a putativevery-faint point-like clump or source embedded in the inner disk, we did notdetect any true companion within the gap between the inner disk and the firstouter ring, at a sensitivity of a few Jupiter masses.

Characterization of the inner disk around HD 141569 A from Keck/NIRC2 L-band vortex coronagraphy