109 citations · 707 across the 54 of their papers we have counts for
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The Photonic Lantern Nuller: from concept to laboratory and on-sky demonstrations
Yinzi Xin, Nemanja Jovanovic, Dimitri Mawet +18
This thesis work presents the conceptual design and experimental characterization of the Photonic Lantern Nuller instrument, which uses a multimode-to-single-mode demultiplexing wa…
A socio-demographic study of the exoplanet direct imaging community II
Lucie Leboulleux, Niyati Desai, Daniel Echeverri +9
Recognizing and addressing under-representation, exclusion, and problematic behavior within astronomy and astrophysics is crucial. In 2019, a survey was conducted at the Spirit of…
Implicit Electric Field Conjugation with the Photonic Lantern Nuller
Yinzi Xin, Daniel Echeverri, Nemanja Jovanovic +12
The Photonic Lantern Nuller (PLN) is an instrument concept designed to characterize exoplanets within a single beam-width from its host star. The PLN leverages the spatial symmetry…
Technical description and performance of the phase II version of the Keck Planet Imager and Characterizer
Nemanja Jovanovic, Daniel Echeverri, Jacques-Robert Delorme +46
The Keck Planet Imager and Characterizer (KPIC) is a series of upgrades for the Keck II Adaptive Optics (AO) system and the NIRSPEC spectrograph to enable diffraction limited, high…
Towards understanding interactions between the AO system and segment co-phasing with the vector-Zernike wavefront sensor on Keck
Maïssa Salama, Charlotte Guthery, Vincent Chambouleyron +14
We extend our previous demonstration of the first on-sky primary mirror segment closed-loop control on Keck using a vector-Zernike wavefront sensor (vZWFS), which improved the Stre…
The high-contrast performance of the Keck Planet Imager and Characterizer
Jason J. Wang, Dimitri Mawet, Jerry W. Xuan +25
The Keck Planet Imager and Characterizer (KPIC), a series of upgrades to the Keck II Adaptive Optics System and Instrument Suite, aims to demonstrate high-resolution spectroscopy o…
Keck Primary Mirror Closed-Loop Segment Control using a Vector-Zernike Wavefront Sensor
Maissa Salama, Charlotte Guthery, Vincent Chambouleyron +17
We present the first on-sky segmented primary mirror closed-loop piston control using a Zernike wavefront sensor (ZWFS) installed on the Keck II telescope. Segment co-phasing error…
Laboratory demonstration of a Photonic Lantern Nuller in monochromatic and broadband light
Yinzi Xin, Daniel Echeverri, Nemanja Jovanovic +11
Photonic lantern nulling (PLN) is a method for enabling the detection and characterization of close-in exoplanets by exploiting the symmetries of the ports of a mode-selective phot…
Exploring calibration algorithms to maximize the null depth in KPIC's vortex fiber nulling mode
Sofia Hillman, Daniel Echeverri, Maxwell A. Millar-Blanchaer +3
Vortex fiber nulling (VFN) is a new interferometric technique with the potential to unlock the ability to detect and spectroscopically characterize exoplanets at angular separation…
Vortex Fiber Nulling for Exoplanet Observations: Implementation and First Light
Daniel Echeverri, Jerry Xuan, Nemanja Jovanovic +31
Vortex fiber nulling (VFN) is a single-aperture interferometric technique for detecting and characterizing exoplanets separated from their host star by less than a diffracted beam…
On-sky speckle nulling through a single-mode fiber with the Keck Planet Imager and Characterizer
Yinzi Xin, Jerry W. Xuan, Dimitri Mawet +14
The Keck Planet Imager and Characterizer (KPIC) is an instrument at the Keck II telescope that enables high-resolution spectroscopy of directly imaged exoplanets and substellar com…
Observing inside the coronagraphic regime with optimized single-mode nulling interferometry
E. Serabyn, G. Ruane, D. Echeverri
The number of terrestrial exoplanets accessible to high-contrast coronagraphic imaging with large telescopes is limited by the smallest angular offset from bright stars at which co…
Efficient detection and characterization of exoplanets within the diffraction limit: nulling with a mode-selective photonic lantern
Yinzi Xin, Nemanja Jovanovic, Garreth Ruane +9
Coronagraphs allow for faint off-axis exoplanets to be observed, but are limited to angular separations greater than a few beam widths. Accessing closer-in separations would greatl…
The Keck Planet Imager and Characterizer: A dedicated single-mode fiber injection unit for high resolution exoplanet spectroscopy
Jacques-Robert Delorme, Nemanja Jovanovic, Daniel Echeverri +28
The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument to demonstrate new technological and instrumental concepts initially developed for the exoplanet direc…
Enhancing Direct Exoplanet Spectroscopy with Apodizing and Beam Shaping Optics
Benjamin Calvin, Nemanja Jovanovic, Garreth Ruane +8
Direct exoplanet spectroscopy aims to measure the spectrum of an exoplanet while simultaneously minimizing the light collected from its host star. Isolating the planet light from t…
Enhanced high-dispersion coronagraphy with KPIC phase II: design, assembly and status of sub-modules
N. Jovanovic, B. Calvin, M. Porter +17
The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument for high-dispersion coronagraphy in the K and L bands on Keck. This instrument will provide the first…
Detecting and characterizing close-in exoplanets with Vortex Fiber Nulling
Daniel Echeverri, Garreth Ruane, Benjamin Calvin +8
Vortex Fiber Nulling (VFN) is an interferometric method for suppressing starlight to detect and spectroscopically characterize exoplanets. It relies on a vortex phase mask and sing…
Microelectromechanical deformable mirror development for high-contrast imaging, part 2: the impact of quantization errors on coronagraph image contrast
Garreth Ruane, Daniel Echeverri, Eduardo Bendek +8
Stellar coronagraphs rely on deformable mirrors (DMs) to correct wavefront errors and create high contrast images. Imperfect control of the DM limits the achievable contrast and, t…
High-contrast Demonstration of an Apodized Vortex Coronagraph
Jorge Llop-Sayson, Garreth Ruane, Dimitri Mawet +7
High contrast imaging is the primary path to the direct detection and characterization of Earth-like planets around solar-type stars; a cleverly designed internal coronagraph suppr…
Status of the Keck Planet Imager and Characterizer Phase II Development
Jacklyn Pezzato, Nemanja Jovanovic, Dimitri Mawet +15
The Keck Planet Imager and Characterizer comprises of a series of upgrades to the Keck II adaptive optics system and instrument suite to improve the direct imaging and high resolut…
The Keck Planet Imager and Characterizer: Demonstrating advanced exoplanet characterization techniques for future extremely large telescopes
N. Jovanovic, J. R. Delorme, C. Z. Bond +25
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system enabling high contrast imaging and high-resolution spectroscopic characterizatio…
The vortex fiber nulling mode of the Keck Planet Imager and Characterizer (KPIC)
Daniel Echeverri, Garreth Ruane, Nemanja Jovanovic +8
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system that includes an active fiber injection unit (FIU) for efficiently routing light…
Vortex fiber nulling for exoplanet observations: conceptual design, theoretical performance, and initial scientific yield predictions
Garreth Ruane, Daniel Echeverri, Nemanja Jovanovic +5
Vortex fiber nulling (VFN) is a method that may enable the detection and characterization of exoplanets at small angular separations (0.5-2 ) with ground- and space-based tele…
Demonstration of an electric field conjugation algorithm for improved starlight rejection through a single mode optical fiber
Jorge Llop Sayson, Garreth Ruane, Dimitri Mawet +8
Linking a coronagraph instrument to a spectrograph via a single mode optical fiber is a pathway towards detailed characterization of exoplanet atmospheres with current and future g…