Segment-level thermal sensitivity analysis for exo-Earth coronagraphy with segmented space telescopes

Abstract

Direct imaging and characterization of Earth-like planets require ultra-stable wavefronts to achieve a starlight suppression level of 100 parts per trillion (ppt) in the coronagraphic dark region of the host star. Thermal drifts in the telescope may affect the wavefront stability. In this context, we present a segment-level thermal stability error budget for segmented space telescopes crucial to Earth-like planet detection and specify requirements for an ultra-stable telescope. Our study utilizes multiple segmented primary mirror architectures, each with their respective apodizer solution developed by the Segmented Coronagraph Design & Analysis research team at the Space Telescope Science Institute, tailored to an off-axis ~6 m-aperture space telescope design. Using a detailed finite element model provided by L3Harris Technologies, we relate the temperature gradient at the location of the primary mirror to wavefront variations on each segment. We allocate both static and dynamic thermal tolerances for each segment using the Pair-based Analytical model for Segmented Telescope Imaging from Space sensitivity approach, and a batch-estimation algorithm respectively. Our analysis shows a non-uniform tolerance allocation across all segments of the primary mirror, as a result of apodization, and generally, with an increase in segment numbers, the tolerances for outer segments become less stringent. We observe trade-offs between segment size, tolerance relaxation and optimal wavefront sensing time to achieve a desired dark-hole contrast.

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Cite

BibTeX RIS

BibTeX

@article{sahoo2026segmentlevel,
  title = {{Segment-level thermal sensitivity analysis for exo-Earth coronagraphy with segmented space telescopes}},
  author = {Ananya Sahoo and Laurent Pueyo and Iva Laginja and Bryony F. Nickson and Leonid Pogorelyuk and Laura E. Coyle and Rémi Soummer and Matthew East},
  journal = {Journal of Astronomical Telescopes Instruments and Systems},
  year = {2026},
  month = jul,
  doi = {10.1117/1.jatis.12.4.041029},
  eprint = {2607.28393},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05792934v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Segment-level thermal sensitivity analysis for exo-Earth coronagraphy with segmented space telescopes
AU  - Ananya Sahoo
AU  - Laurent Pueyo
AU  - Iva Laginja
AU  - Bryony F. Nickson
AU  - Leonid Pogorelyuk
AU  - Laura E. Coyle
AU  - Rémi Soummer
AU  - Matthew East
PY  - 2026
DA  - 2026/07/27
JO  - Journal of Astronomical Telescopes Instruments and Systems
DO  - 10.1117/1.jatis.12.4.041029
UR  - https://hal.science/hal-05792934v1
AB  - Direct imaging and characterization of Earth-like planets require ultra-stable wavefronts to achieve a starlight suppression level of 100 parts per trillion (ppt) in the coronagraphic dark region of the host star. Thermal drifts in the telescope may affect the wavefront stability. In this context, we present a segment-level thermal stability error budget for segmented space telescopes crucial to Earth-like planet detection and specify requirements for an ultra-stable telescope. Our study utilizes multiple segmented primary mirror architectures, each with their respective apodizer solution developed by the Segmented Coronagraph Design & Analysis research team at the Space Telescope Science Institute, tailored to an off-axis ~6 m-aperture space telescope design. Using a detailed finite element model provided by L3Harris Technologies, we relate the temperature gradient at the location of the primary mirror to wavefront variations on each segment. We allocate both static and dynamic thermal tolerances for each segment using the Pair-based Analytical model for Segmented Telescope Imaging from Space sensitivity approach, and a batch-estimation algorithm respectively. Our analysis shows a non-uniform tolerance allocation across all segments of the primary mirror, as a result of apodization, and generally, with an increase in segment numbers, the tolerances for outer segments become less stringent. We observe trade-offs between segment size, tolerance relaxation and optimal wavefront sensing time to achieve a desired dark-hole contrast.
SN  - 2329-4124
SN  - 2329-4221
ER  -

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