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Broadband vortex fiber nulling: high-dispersion exoplanet science at the diffraction limit

Echeverri, Daniel and Ruane, Garreth and Jovanovic, Nemanja and Delorme, Jacques-Robert and Wang, Jason and Millar-Blanchaer, Maxwell A. and Xuan, Jerry and Toman, Katie and Mawet, Dimitri (2021) Broadband vortex fiber nulling: high-dispersion exoplanet science at the diffraction limit. In: Techniques and Instrumentation for Detection of Exoplanets X. Proceedings of SPIE. No.11823. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 118230A.

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As the number of confirmed exoplanets continues to grow, there is an increased push to spectrally characterize them to determine their atmospheric composition, formation paths, rotation rates, habitability, and much more. However, there is a large population of known exoplanets that either do not transit their star or have been detected at very small angular separations such that they are inaccessible to traditional coronagraph systems. Vortex Fiber Nulling (VFN) is a new single-aperture interferometric technique that uses the entire telescope pupil to bridge the gap between RV methods and traditional coronagraphy by enabling the direct observation and spectral characterization of targets at and within the diffraction limit. By combining a vortex mask with a single mode fiber, the on-axis starlight is rejected while the off-axis planet light is coupled and efficiently routed to a radiometer or spectrograph for analysis. We have demonstrated VFN in the lab monochromatically in the past. In this talk we present a polychromatic validation of VFN with null depths of 1e-4 across 10% bandwidth light. We also provide an update on deployment plans and predicted yield estimates for the VFN mode of the Keck Planet Imager and Characterizer (KPIC) instrument. Using PSISIM, a simulation package developed by our group, we asses KPIC VFN's ability to detect and characterize different types of targets including known exoplanets detected via the RV method. The KPIC VFN on-sky demonstration will pave the road to deployment on future instruments like HISPEC and MODHIS where it could provide high-resolution spectra of sub-Jupiter mass planets down to 5 milliarcseconds from their star.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Echeverri, Daniel0000-0002-1583-2040
Ruane, Garreth0000-0003-4769-1665
Jovanovic, Nemanja0000-0001-5213-6207
Delorme, Jacques-Robert0000-0001-8953-1008
Wang, Jason0000-0003-0774-6502
Millar-Blanchaer, Maxwell A.0000-0001-6205-9233
Xuan, Jerry0000-0002-6618-1137
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE). Daniel Echeverri is supported by a NASA Future Investigators in NASA Earth and Space Science and Technology (FINESST) fellowship under award #80NSSC19K1423. This work was supported by the Heising-Simons Foundation through grants #2015-129, #2017-318, and #2019-1312. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Astronomy Department
Funding AgencyGrant Number
NASA Earth and Space Science Fellowship80NSSC19K1423
Heising-Simons Foundation2015-129
Heising-Simons Foundation2017-318
Heising-Simons Foundation2019-1312
Subject Keywords:Exoplanets, Interferometry, Instrumentation, High Dispersion Coronagraphy, Keck Telescope, Fiber Nulling
Series Name:Proceedings of SPIE
Issue or Number:11823
Record Number:CaltechAUTHORS:20220610-59544400
Persistent URL:
Official Citation:Daniel Echeverri, Garreth Ruane, Nemanja Jovanovic, Jacques-Robert Delorme, Jason Wang, Maxwell A. Millar-Blanchaer, Jerry Xuan, Katie Toman, and Dimitri Mawet "Broadband vortex fiber nulling: high-dispersion exoplanet science at the diffraction limit", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118230A (1 September 2021);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115127
Deposited By: Tony Diaz
Deposited On:11 Jun 2022 00:26
Last Modified:13 Jun 2022 17:10

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