Contrast curve of Vega in 2018

Being one of the brightest and closest stars to the Sun, the photometric standard star Vega hosts a two-belt debris disk structure. Together with the fact that its planetary system is being viewed nearly face-on, Vega has been one of the prime targets for planet imaging efforts.

Using the vector vortex coronagraph on Keck/NIRC2 in Ms-band at 4.67-micron, we report the planet detection limits from 1 au to 22au for Vega with an on-target time of 1.8h. We reach a 3 Jupiter mass limit exterior to 12au, which is nearly an order of magnitude deeper than existing studies. Combining with existing radial velocity studies, we can confidently rule out the existence of companions more than ~8 Jupiter mass from 22au down to 0.1au for Vega.