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

Mawet, Dimitri and Ruane, Garreth and Xuan, Wenhao and Echeverri, Daniel and Klimovich, Nikita S. and Randolph, Michael and Fucik, Jason and Wallace, James K. and Wang, Ji and Vasisht, Gautam and Dekany, Richard and Mennesson, Bertrand and Choquet, Élodie and Delorme, Jacques-Robert and Serabyn, Eugene (2017) Observing Exoplanets with High-Dispersion Coronagraphy. II. Demonstration of an Active Single-Mode Fiber Injection Unit. Astrophysical Journal, 838 (2). Art. No. 92. ISSN 1538-4357. doi:10.3847/1538-4357/aa647f.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Mawet, Dimitri0000-0002-8895-4735
Ruane, Garreth0000-0003-4769-1665
Echeverri, Daniel0000-0002-1583-2040
Wang, Ji0000-0002-4361-8885
Vasisht, Gautam0000-0002-1871-6264
Mennesson, Bertrand0000-0003-4205-4800
Choquet, Élodie0000-0002-9173-0740
Additional Information:© 2017. The American Astronomical Society. Received 2016 October 24; revised 2017 February 12; accepted 2017 February 28; published 2017 March 30. The authors would like to acknowledge the referee for the thorough review and constructive comments. The authors would like to acknowledge the financial support of the Heising–Simons foundation. Facility: Caltech's High-Contrast Spectroscopy Testbed for Segmented Telescopes (HCST). -
Group:Astronomy Department
Funding AgencyGrant Number
Heising-Simons FoundationUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipUNSPECIFIED
Subject Keywords:brown dwarfs; instrumentation: adaptive optics; instrumentation: spectrographs; techniques: high angular resolution; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20170330-075341818
Persistent URL:
Official Citation:D. Mawet et al 2017 ApJ 838 92
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75536
Deposited By: Tony Diaz
Deposited On:30 Mar 2017 15:03
Last Modified:15 Nov 2021 16:34

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