Publications (38)
Advancing on-chip Kerr optical parametric oscillation towards coherent applications covering the green gap
Yi Sun, Jordan Stone, Xiyuan Lu +3
Optical parametric oscillation (OPO) in Kerr microresonators can efficiently transfer near-infrared laser light into the visible spectrum. To date, however, chromatic dispersion ha…
All-Optical Noise Quenching of An Integrated Frequency Comb
Gregory Moille, Pradyoth Shandilya, Jordan Stone +2
Integrated frequency combs promise transformation of lab-based metrology into disruptive real-world applications. These microcombs are, however, sensitive to stochastic thermal flu…
The LEECH Exoplanet Imaging Survey: Characterization of the Coldest Directly Imaged Exoplanet, GJ 504 b, and Evidence for Super-Stellar Metallicity
Andrew J. Skemer, Caroline V. Morley, Neil T. Zimmerman +39
As gas giant planets and brown dwarfs radiate away the residual heat from their formation, they cool through a spectral type transition from L to T, which encompasses the dissipati…
Detection of intrinsic source structure at ~3 Schwarzschild radii with Millimeter-VLBI observations of SAGITTARIUS A*
Ru-Sen Lu, Thomas P. Krichbaum, Alan L. Roy +53
We report results from very long baseline interferometric (VLBI) observations of the supermassive black hole in the Galactic center, Sgr A*, at 1.3 mm (230 GHz). The observations w…
Two-Dimensional Nonlinear Mixing Between a Dissipative Kerr Soliton and Continuous Waves for a Higher-Dimension Frequency Comb
Gregory Moille, Christy Li, Jordan Stone +6
Dissipative Kerr solitons (DKSs) intrinsically exhibit two degrees of freedom through their group and phase rotation velocity. Periodic extraction of the DKS into a waveguide produ…
Betelgeuse scope: Single-mode-fibers-assisted optical interferometer design for dedicated stellar activity monitoring
Narsireddy Anugu, Katie M. Morzinski, Josh Eisner +12
Betelgeuse has gone through a sudden shift in its brightness and dimmed mysteriously. This is likely caused by a hot blob of plasma ejected from Betelgeuse and then cooled to obscu…
Hybrid-mode-family Kerr optical parametric oscillation for robust coherent light generation on chip
Feng Zhou, Xiyuan Lu, Ashutosh Rao +5
Optical parametric oscillation (OPO) using the third-order nonlinearity () in integrated photonics platforms is an emerging approach for coherent light generation, and ha…
From Young to Older Disks: JWST/MIRI Evidence for Fading Molecular Emission and Hints for Elevated C/O in Upper Scorpius
Chengyan Xie, Ilaria Pascucci, Feng Long +23
We present JWST/MIRI spectroscopy of 14 disks in the older (~5-10 Myr) Upper Scorpius (USco) association and use slab of gas in local thermal equilibrium to infer basic gas propert…
ALES: Overview and Upgrades
Andrew J. Skemer, Philip Hinz, Jordan Stone +4
The Arizona Lenslets for Exoplanet Spectroscopy (ALES) is the world's first AO-fed thermal infrared integral field spectrograph, mounted inside the Large Binocular Telescope Interf…
An 8 hour characteristic time-scale in submillimetre light curves of Sagittarius A*
Jason Dexter, Brandon Kelly, Geoffrey C. Bower +4
We compile and analyse long term (~10 year) submillimetre (1.3, 0.87, 0.43 mm, submm) wavelength light curves of the Galactic centre black hole, Sagittarius A*. The 0.87 and 0.43 m…
Direct images and spectroscopy of a giant protoplanet driving spiral arms in MWC 758
Kevin Wagner, Jordan Stone, Andrew Skemer +23
Understanding the driving forces behind spiral arms in protoplanetary disks remains a challenge due to the faintness of young giant planets. MWC 758 hosts such a protoplanetary dis…
Fourier synthesis dispersion engineering of photonic crystal microrings for broadband frequency combs
Gregory Moille, Xiyuan Lu, Jordan Stone +2
Dispersion engineering of microring resonators is crucial for optical frequency comb applications, to achieve targeted bandwidths and powers of individual comb teeth. However, conv…
The TRENDS High-Contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)
Justin R. Crepp, Erica J. Gonzales, Brendan P. Bowler +8
Monitoring the long-term radial velocity (RV) and acceleration of nearby stars has proven an effective method for directly detecting binary and substellar companions. Some fraction…
First Images of the Protoplanetary Disk Around PDS 201
Kevin Wagner, Jordan Stone, Ruobing Dong +11
Scattered light imaging has revealed nearly a dozen circumstellar disks around young Herbig Ae/Be starsenabling studies of structures in the upper disk layers as potential signs…
High-performance microresonator optical parametric oscillator on a silicon chip
Edgar F. Perez, Gregory Moille, Xiyuan Lu +3
Optical parametric oscillation (OPO) is distinguished by its wavelength access, that is, the ability to flexibly generate coherent light at wavelengths that are dramatically differ…
The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES): driving science cases and expected outcomes
Steph Sallum, Andrew Skemer, Deno Stelter +34
The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES) is a m, high-contrast integral field spectrograph (IFS) currently being built for Keck Observ…
ELT Imaging of MWC 297 from the 23-m LBTI: Complex Disk Structure and a Companion Candidate
Steph Sallum, Josh Eisner, Jordan Stone +3
Herbig Ae/Be stars represent the early outcomes of star formation and the initial stages of planet formation at intermediate stellar masses. Understanding both of these processes r…
Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales
Vincent L. Fish, Michael D. Johnson, Sheperd S. Doeleman +69
The Galactic Center black hole Sagittarius A* (Sgr A*) is a prime observing target for the Event Horizon Telescope (EHT), which can resolve the 1.3 mm emission from this source on…
Parasitic loss in microring-waveguide coupling and its impact on wideband nonlinear photonics
Yi Sun, Daniel Pimbi, Xiyuan Lu +4
Microring resonators enable the enhancement of nonlinear frequency mixing processes, generating output fields at frequencies that widely differ from the inputs, in some cases by mo…
Orbital Modeling of HII 1348B: An Eccentric Young Substellar Companion in the Pleiades
Gabriel Weible, Kevin Wagner, Jordan Stone +4
Brown dwarfs with known physical properties (e.g., age and mass) are essential for constraining models of the formation and evolution of substellar objects. We present new high-con…
Design of SCALES: A 2-5 Micron Coronagraphic Integral Field Spectrograph for Keck Observatory
Andrew Skemer, R. Deno Stelter, Stephanie Sallum +49
We present the design of SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) a new 2-5 micron coronagraphic integral field spectrograph under construction fo…
Self-aligned optical microcomb emerging between octave separated lasers
Grégory Moille, Pradyoth Shandilya, Jordan Stone +11
Optical frequency combs (OFCs) are frequency rulers essential for precision metrology, next generation navigation, and testing of fundamental physics. Despite intense efforts, chip…
Status of commissioning stabilized infrared Fizeau interferometry with LBTI
Eckhart Spalding, Phil Hinz, Katie Morzinski +5
The Large Binocular Telescope Interferometer (LBTI) has the longest baseline in the world, 22.7 m, for performing astronomical interferometry in Fizeau mode, which involves beam co…
Simulating medium-spectral-resolution exoplanet characterization with SCALES angular/reference differential imaging
Aditi Desai, Stephanie E. Sallum, Ravinder Banyal +30
SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) is a 2 - 5 micron high-contrast lenslet-based integral field spectrograph (IFS) designed to characterize…
Towards controlled Fizeau observations with the Large Binocular Telescope
Eckhart Spalding, Phil Hinz, Steve Ertel +2
The Large Binocular Telescope Interferometer (LBTI) can perform Fizeau interferometry in the focal plane, which accesses spatial information out to the LBT's full 22.7-m edge-to-ed…
Thermal and Nonlinear Dissipative-Soliton Dynamics in Kerr Microresonator Frequency Combs
Jordan Stone, Travis Briles, Tara Drake +4
We explore the dynamical response of dissipative Kerr solitons to changes in pump power and detuning and show how thermal and nonlinear processes couple these parameters to the fre…
First Light with ALES: A 2-5 Micron Adaptive Optics Integral Field Spectrograph for the LBT
Andrew J. Skemer, Philip Hinz, Manny Montoya +9
Integral field spectrographs are an important technology for exoplanet imaging, due to their ability to take spectra in a high-contrast environment, and improve planet detection se…
Recovering simulated planet and disk signals using SCALES aperture masking
Mackenzie Lach, Steph Sallum, Ravinder Banyal +29
The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES) instrument is a lenslet-based integral field spectrograph that will operate at 2 to 5 microns, imagin…
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems: Best Practices for Data Collection in Cycle 2 and Beyond
Sasha Hinkley, Beth Biller, Andrew Skemer +35
We present a set of recommended best practices for JWST data collection for members of the community focussed on the direct imaging and spectroscopy of exoplanetary systems. These…
Thermal Emission in the Southwest Clump of VY CMa
Michael S. Gordon, Terry J. Jones, Roberta M. Humphreys +6
We present high spatial resolution LBTI/NOMIC images of VY CMa and its massive outflow feature, the Southwest (SW) Clump. Combined with high-resolution imaging from HS…
Imaging low-mass planets within the habitable zones of nearby stars with ground-based mid-infrared imaging
Kevin Wagner, Steve Ertel, Jordan Stone +8
Giant exoplanets on 10-100 au orbits have been directly imaged around young stars. The peak of the thermal emission from these warm young planets is in the near-infrared (~1-5 micr…
Kerr-Induced Synchronization of a Cavity Soliton to an Optical Reference
Gregory Moille, Jordan Stone, Michal Chojnacky +4
The phase-coherent frequency division of a stabilized optical reference laser to the microwave domain is made possible by optical frequency combs (OFCs). Fundamentally, OFC-based c…
Upgrading LBTI/NOMIC with a quadruple annular groove phase mask and GeoSnap detector for imaging nearby, habitable-zone exoplanets
Kevin Wagner, Manny Montoya, Steve Ertel +32
The paper describes two upgrades to the Large Binocular Telescope Interferometer’s NOMIC camera—a quadruple annular groove phase mask coronagraph and a new Teledyne GeoSnap detecto…
The Probability of Vacuum Metastability and Artificial Vacuum Decay: Expert Survey Results
Jordan Stone, Youssef Saleh, Darryl Wright +1
Vacuum decay posits that the universe's apparent vacuum is metastable and could transition to a lower-energy state. According to current physics models, if such a transition occurr…
All-Optical Azimuthal Trapping of Dissipative Kerr Multi-Solitons for Relative Noise Suppression
Pradyoth Shandilya, Shao-Chien Ou, Jordan Stone +4
Temporal cavity solitons, or dissipative Kerr solitons (DKS) in integrated microresonators, are essential for deployable metrology technologies. Such applications favor the lowest…
On-chip Kerr parametric oscillation with integrated heating for enhanced frequency tuning and control
Jordan Stone, Daron Westly, Gregory Moille +1
Nonlinear microresonators can convert light from chip-integrated sources into new wavelengths within the visible and near-infrared spectrum. For most applications, such as the inte…
On the Chemical Abundance of HR 8799 and the Planet c
Ji Wang, Jason Wang, Bo Ma +10
Comparing chemical abundances of a planet and the host star reveals the origin and formation path. Stellar abundance is measured with high-resolution spectroscopy. Planet abundance…
An Integrated-Photonics Optical-Frequency Synthesizer
Daryl T. Spencer, Tara Drake, Travis C. Briles +24
Integrated-photonics microchips now enable a range of advanced functionalities for high-coherence applications such as data transmission, highly optimized physical sensors, and har…