An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction tolerances limit the utility of this technique for directly imaging extrasolar terrestrial planets. We present a variation on the basic band-limited mask design - a family of "notch-filter" masks - that mitigates this problem. These robust and trivially achromatic masks can be easily manufactured by cutting holes in opaque material.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Circumstellar matter
- Instrumentation: Adaptive optics
- Planetary systems