Observing Exoplanets with High-dispersion Coronagraphy. II. Demonstration of an Active Single-mode Fiber Injection Unit

Autor: Garreth Ruane, Nikita Klimovich, Daniel Echeverri, Michael Randolph, Richard Dekany, Dimitri Mawet, Wenhao Xuan, James K. Wallace, Elodie Choquet, Jacques-Robert Delorme, Eugene Serabyn, Jason Fucik, Bertrand Mennesson, Ji Wang, Gautam Vasisht
Přispěvatelé: Caltech Department of Astronomy [Pasadena], California Institute of Technology (CALTECH), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH)
Rok vydání: 2017
Předmět:
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
FOS: Physical sciences
01 natural sciences
7. Clean energy
law.invention
010309 optics
Speckle pattern
Optics
law
Planet
0103 physical sciences
Spectral resolution
Adaptive optics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
010303 astronomy & astrophysics
Coronagraph
ComputingMilieux_MISCELLANEOUS
Earth and Planetary Astrophysics (astro-ph.EP)
Wavefront
Physics
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
Single-mode optical fiber
Astronomy and Astrophysics
Exoplanet
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - Instrumentation and Methods for Astrophysics
business
Astrophysics - Earth and Planetary Astrophysics
Zdroj: The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2017, 838 (2), pp.92. ⟨10.3847/1538-4357/aa647f⟩
ISSN: 1538-4357
0004-637X
DOI: 10.3847/1538-4357/aa647f
Popis: High-dispersion coronagraphy (HDC) optimally combines high contrast imaging techniques such as adaptive optics/wavefront control plus coronagraphy to high spectral resolution spectroscopy. HDC is a critical pathway towards fully characterizing exoplanet atmospheres across a broad range of masses from giant gaseous planets down to Earth-like planets. In addition to determining the molecular composition of exoplanet atmospheres, HDC also enables Doppler mapping of atmosphere inhomogeneities (temperature, clouds, wind), as well as precise measurements of exoplanet rotational velocities. Here, we demonstrate an innovative concept for injecting the directly-imaged planet light into a single-mode fiber, linking a high-contrast adaptively-corrected coronagraph to a high-resolution spectrograph (diffraction-limited or not). Our laboratory demonstration includes three key milestones: close-to-theoretical injection efficiency, accurate pointing and tracking, on-fiber coherent modulation and speckle nulling of spurious starlight signal coupling into the fiber. Using the extreme modal selectivity of single-mode fibers, we also demonstrated speckle suppression gains that outperform conventional image-based speckle nulling by at least two orders of magnitude.
Comment: 10 pages, 7 figures, accepted by ApJ
Databáze: OpenAIRE
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