Ms. Mary Angelie M. Alagao Profile

Mary Angelie M. Alagao

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Publications (5)

Proceedings Article | 9 September 2019 Presentation + Paper

EXOhSPEC folded design optimization and performance estimation

Esther Lhospice, Christophe Buisset, Hugh R. Jones, William Martin, Ronny Errmann, Sirinrat Sithajan, Chantira Boonsri, Piyamas Choochalerm, Guillem Anglada-Escudé, David Campbell, Mary Angelie Alagao, Jitsupa Paenoi, Apirat Prasit, Thirasak Panyaphirawat, Somsawat Rattanasoon, Apichat Leckngam, David Mkrtichian, Suparerk Aukkaravittayapun

Proc. SPIE. 11117, Techniques and Instrumentation for Detection of Exoplanets IX

KEYWORDS: Spectrographs, Prototyping, Tolerancing, Prisms, Sensors, Manufacturing, Telescopes, Collimators

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Proceedings Article | 12 July 2019

The evanescent wave coronagraph project: development status and potential for space based observations

Mary Angelie Alagao, Christophe Buisset, Thierry Lépine, Eric Thiébaut, Maud Langlois, Michel Tallon, Isabelle Tallon-Bosc, Yves Rabbia, Saran Poshyachinda, Boonrucksar Soonthornthum

Proc. SPIE. 11180, International Conference on Space Optics — ICSO 2018

KEYWORDS: Coronagraphy, Stars, Point spread functions, Adaptive optics, Prototyping, Mirrors, Telescopes, V band, Optical instrument design, Deformable mirrors

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The Evanescent Wave Coronagraph (EvWaCo) is a coronagraph with an occulting mask based on the frustration of total internal reflection to i) produce an achromatic extinction of the central star and ii) reveal the faint companion surrounding the star. Results obtained in laboratory conditions show contrast performance of a few 10^-6 between 10 λ_C/D and 20 λ_C/D over the full I-band centered at the wavelength λ_C = 800 nm with a spectral ratio of Δλ/ λ_C ≈ 20% in unpolarized light.

In this paper, we discuss the advantages of using EvWaCo to observe and characterize exoplanets with a space-based telescope. In the first section, we describe the system and present the current results obtained with the EvWaCo testbed. We also illustrate the capability of this coronagraph to detect the companion 30,000 times (respectively, 100,000 times) fainter than the central star at distances equal to 15 Airy radii (respectively, 30 Airy radii) from the PSF center in polychromatic and unpolarized light.

In the second section, we describe the design of the prototype dedicated to the on-sky tests of the instrument with the 2.4 m Thai National Telescope at horizon 2020. This prototype has been designed with the objective to reach a contrast equal to a few 10^-4 at the inner working angle (IWA) equal to 3 λ/D from the star PSF center while observing through the atmosphere over the full photometric I-band. This prototype will include an adaptive optics specified to reach at λ ≈ 800 nm a Strehl ratio > 0.8 for magnitude m < 7.

In the third section, we show the theoretical performance of EvWaCo: a contrast comprised between a few 10^-6 and 10^-7 in the I-Band between 3 λ/D and 10 λ/D in the I-Band for an IWA equal to 3 λ/D with a Gaussian apodization in unpolarized light. We also show that similar contrasts performance are obtained in the V-, R-, bands, thus illustrating the EvWaCo quasi-achromaticity. Finally, we discuss the advantages and the limitation using the proposed concept for space-based observations and spectral characterization of exoplanets.

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Proceedings Article | 10 July 2018 Presentation + Paper

The evanescent wave coronagraph project: setup results and demonstrator preliminary design

Christophe Buisset, Thierry Lépine, Eric Thiébaut, Maud Langlois, Michel Tallon, Mary Angelie Alagao, Isabelle Tallon-Bosc, Yves Rabbia, Saran Poshyachinda, Boonrucksar Soonthornthum , Elsa Ducrot

Proc. SPIE. 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

KEYWORDS: Coronagraphy, Adaptive optics, Stars, Point spread functions, Wavefronts, Prototyping, Wavefront distortions, Mirrors, Telescopes, Polishing

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Proceedings Article | 5 March 2018 Paper

Activity status and future plans for the Optical Laboratory of the National Astronomical Research Institute of Thailand

Christophe Buisset, Saran Poshyachinda, Boonrucksar Soonthornthum, Apirat Prasit, Mary Angelie Alagao, Piyamas Choochalerm, Weerapot Wanajaroen, Thierry Lepine, Yves Rabbia, Suparerk Aukkaravittayapun, Apichat Leckngam , Griangsak Thummasorn , Surin Ngernsujja, Anuphong Inpan, Pimon Kaewsamoet, Esther Lhospice, Panomsak Meemon, Pornapa Artsang, Kajpanya Suwansukho, Wichit Sirichote, Jitsupa Paenoi

Proc. SPIE. 10714, Third International Conference on Photonics Solutions (ICPS2017)

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Proceedings Article | 1 September 2017 Paper

Development status and performance of the evanescent wave coronagraph testbed

Mary Angelie Alagao, Christophe Buisset, Yves Rabbia, Thierry Lepine, Saran Poshyachinda, Boonrucksar Soonthornthum

Proc. SPIE. 10400, Techniques and Instrumentation for Detection of Exoplanets VIII

KEYWORDS: Coronagraphy, Astronomical instrumentation, Exoplanets, Imaging systems

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