Direct imaging with a hypertelescope of red supergiant stellar surfaces

F. Patru; A. Chiavassa; D. Mourard; N. Tarmoul

doi:10.1117/12.857429

21 July 2010 Direct imaging with a hypertelescope of red supergiant stellar surfaces

F. Patru, A. Chiavassa, D. Mourard, N. Tarmoul

Proceedings Volume 7734, Optical and Infrared Interferometry II; 77341G (2010) https://doi.org/10.1117/12.857429
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

High angular resolution images obtained with a hypertelescope can strongly constrain the radiative-hydrodynamics simulations of red supergiant (RSG) stars, in terms of intensity contrast, granulation size and temporal variations of the convective motions that are visible on their surface. The characterization of the convective pattern in RSGs is crucial to solve the mass-loss mechanism which contributes heavily to the chemical enrichment of the Galaxy. We show here how the astrophysical objectives and the array configuration are highly dependent to design a hypertelescope. For a given field of view and a given resolution, there is a trade-off between the array geometry and the number of required telescopes to optimize either the (u,v) coverage (to recover the intensity distribution) or the dynamic range (to recover the intensity contrast). To obtain direct snapshot images of Betelgeuse with a hypertelescope, a regular and uniform layout of telescopes is the best array configuration to recover the intensity contrast and the distribution of both large and small granulation cells, but it requires a huge number of telescopes (several hundreds or thousands). An annular configuration allows a reasonable number of telescopes (lower than one hundred) to recover the spatial structures but it provides a low-contrast image. Concerning the design of a pupil densifier to combine all the beams, the photometric fluctuations are not critical (Delta photometry < 50%) contrary to the residual piston requirements (OPD < λ/8) which requires the development of an efficient cophasing system to fully exploit the imaging capability of a hypertelecope.

Citation Download Citation

F. Patru, A. Chiavassa, D. Mourard, and N. Tarmoul "Direct imaging with a hypertelescope of red supergiant stellar surfaces", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77341G (21 July 2010); https://doi.org/10.1117/12.857429

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