First results of nulling interferometry with the Multiple Mirror Telescope

Philip M Hinz, J Roger P Angel, William F. Hoffmann, Donald W Mccarthy, Patrick C. McGuire, Matthew Cheselka, Joseph L. Hora, Neville J. Woolf

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

We have successfully used nulling interferometry at 10 μm wavelength to interferometrically suppress a star's radiation. This technique was first proposed by Bracewell 20 years ago to image extra-solar planets and is now the basis for proposed space-borne instruments to search for Earth-like extra-solar planets and their spectroscopic signatures of habitability and life. In our experiment, the beams from two 1.8 m telescopes of the Multiple Mirror Telescope were brought into registration at a semi-transparent beamsplitter, and the images made coincident on an infrared array detector capable of taking rapid short exposure images. The atmospheric fluctuations caused the phase difference between the beams to fluctuate, changing the total flux of the star seen in the image plane. When the atmosphere caused the wavefronts to be exactly out of phase the entire stellar Airy pattern disappeared. For the unresolved star α Tauri the cancellation was such that a companion only 0.2 arcsec from the star and 25 times fainter would appear equal in intensity to the nulled star. The residual flux was spread into a wide halo suggesting the cause of this flux was imperfect cancellation of the aberrated wavefronts. To increase the precision of nulling beyond this first step several sources of error need to be addressed. We discuss the control of errors due to amplitude, polarization, chromatic differences, stellar leak, and sampling time. Improvements such as active phase tracking, adaptive optics, and cooled optics will increase the achievable gain of nulling interferometry and allow it to be used on fainter objects.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages439-447
Number of pages9
Volume3350
DOIs
StatePublished - 1998
EventAstronomical Interferometry - Kona, HI, United States
Duration: Mar 20 1998Mar 20 1998

Other

OtherAstronomical Interferometry
CountryUnited States
CityKona, HI
Period3/20/983/20/98

Fingerprint

Nulling Interferometry
Interferometry
Telescopes
Stars
Telescope
Star
Mirror
interferometry
Mirrors
telescopes
mirrors
stars
Extrasolar planets
Extrasolar Planets
extrasolar planets
Wavefronts
Fluxes
Cancellation
cancellation
Wave Front

Keywords

  • Extra-solar planet detection
  • Interferometry
  • Nulling

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hinz, P. M., Angel, J. R. P., Hoffmann, W. F., Mccarthy, D. W., McGuire, P. C., Cheselka, M., ... Woolf, N. J. (1998). First results of nulling interferometry with the Multiple Mirror Telescope. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3350, pp. 439-447) https://doi.org/10.1117/12.317108

First results of nulling interferometry with the Multiple Mirror Telescope. / Hinz, Philip M; Angel, J Roger P; Hoffmann, William F.; Mccarthy, Donald W; McGuire, Patrick C.; Cheselka, Matthew; Hora, Joseph L.; Woolf, Neville J.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3350 1998. p. 439-447.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hinz, PM, Angel, JRP, Hoffmann, WF, Mccarthy, DW, McGuire, PC, Cheselka, M, Hora, JL & Woolf, NJ 1998, First results of nulling interferometry with the Multiple Mirror Telescope. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3350, pp. 439-447, Astronomical Interferometry, Kona, HI, United States, 3/20/98. https://doi.org/10.1117/12.317108
Hinz PM, Angel JRP, Hoffmann WF, Mccarthy DW, McGuire PC, Cheselka M et al. First results of nulling interferometry with the Multiple Mirror Telescope. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3350. 1998. p. 439-447 https://doi.org/10.1117/12.317108
Hinz, Philip M ; Angel, J Roger P ; Hoffmann, William F. ; Mccarthy, Donald W ; McGuire, Patrick C. ; Cheselka, Matthew ; Hora, Joseph L. ; Woolf, Neville J. / First results of nulling interferometry with the Multiple Mirror Telescope. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3350 1998. pp. 439-447
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