Summary
Astrobiology.com summary of a technology-development paper (arXiv:2604.23126) presenting simulations of PEEPSS — Photonic-Enabled ExoPlanet Spectroscopic Sensor, an integrated photonic-lantern-fed spectrograph concept for NASA’s Habitable Worlds Observatory (HWO). HWO must achieve ~10⁻¹⁰ star/planet contrast, which demands extreme wavefront stability across the coronagraph system. PEEPSS uses photonic lanterns to couple light from the coronagraph “dark hole” (where exoplanets sit) into single-mode fibers feeding the main spectrograph, while simultaneously using rejected host-star light from inside the dark hole for focal-plane wavefront sensing. Combining the science channel and wavefront sensor in one photonic system eliminates non-common-path errors between sensing and science arms. The concept is especially valuable in the near-infrared (NIR), where the diffraction-limited inner working angle (IWA ∝ λ/D) otherwise grows beyond habitable-zone separations; PEEPSS pushes the achievable IWA inward, expanding HWO’s accessible parameter space for habitable-zone exoplanet imaging and spectroscopic biosignature characterization.
Key Claims
- HWO requires ~10⁻¹⁰ contrast — requires outstanding wavefront measurement and control through the telescope + coronagraph chain.
- PEEPSS uses a set of photonic lanterns to couple coronagraph dark-hole light efficiently into single-mode fibers and the main spectrograph.
- Rejected starlight interior to the dark hole feeds the focal-plane wavefront sensor, eliminating non-common-path errors between sensing and science channels.
- One photonic system combines the science (spectroscopy) and wavefront-sensing channels.
- Particularly advantageous in the near-infrared bandpass, “of particular interest for HWO.”
- Coronagraph IWA scales as λ/D, so NIR imaging normally suffers larger IWAs than visible — PEEPSS reduces the achievable NIR IWA, increasing accessible exoplanet parameter space.
- Authors: genevieve-markees (lead), Stephen S. Eikenberry, Rodrigo Amezcua-Correa, Miguel Bandres, Rebecca Jensen-Clem, Sergio Leon-Saval, Laurent Pueyo, Raphaël Pourcelot.
- arXiv:2604.23126 [astro-ph.IM]; related DOI 10.1117/12.3064610 (SPIE proceedings).
Notable Quotes
“To achieve its stated goals with contrasts of one part in ten billion, HWO will require outstanding stability and precision, particularly in measuring and controlling the wavefront…” — paper abstract
“PEEPSS uses rejected host star light from the region interior to the dark hole to aid in the wavefront sensing; this has the advantage of doing the sensing in the coronograph focal plane, eliminating non-common-path errors…” — paper abstract
“PEEPSS will enable NIR coronagraphic observations at smaller IWA than other approaches, increasing the observational parameter space HWO can probe in the search for exoplanets.” — paper abstract