A5090451796- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Photorefractive and Nonlinear Optics
- Spaceflight effects on biology
- Image Processing and 3D Reconstruction
- Geology and Paleoclimatology Research
- Atmospheric Ozone and Climate
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Fiber Optic Sensors
- Atmospheric and Environmental Gas Dynamics
- Scientific Measurement and Uncertainty Evaluation
- Solid State Laser Technologies
- Astrophysics and Star Formation Studies
- Spectroscopy and Chemometric Analyses
- Geophysics and Sensor Technology
- Optical Systems and Laser Technology
- Advanced Measurement and Metrology Techniques
American Museum of Natural History
2019-2025
Columbia University
2019-2025
University of California, Los Angeles
2023
Wellesley College
2015-2016
Abstract Most recent studies of crater morphometry on Mars have addressed large craters ( D >5 km) using elevation models derived from laser altimetry. In the present work, we examine a global population small (25 m ≤ ≤5 km), relatively well‐preserved simple impact HiRISE stereo‐derived models. We find that scaling laws prior generally overestimate depth and volume at diameters. show rim curvature exhibits strong diameter dependence is well‐described by for <1 km. Above this diameter,...
The Palomar Radial Velocity Instrument (PARVI) is a J & H band, high resolution (R∼80,000) spectrograph on the Hale 5.08-m telescope at Observatory. PARVI stabilized, single-mode fiber-fed spectrometer designed to search for small rocky planets in habitable zones of late-type stars. one first radial velocity (RV) instruments employ fibers (SMF) instead more common multi-mode (MMF). SMFs provide number advantages over MMFs. In particular, they only allow spatial mode light propagate,...
A wave of precision radial velocity (RV) instruments will open the door to exploring populations companions low-mass stars. The Palomar Radial Velocity Instrument (PARVI) be optimized detect RV signals cool K and M stars with an instrument floor 30 cm / s. PARVI operate in λ = 1.2- 1.8-μm-wavelength range a spectral resolution Δλ ∼ 100,000. It on 5.1-m Hale telescope use Palomar's PALM-3000 adaptive optics system, single-mode fibers, H-band laser frequency comb probe characterize population...
The PAlomar Radial Velocity Instrument (PARVI) is a diffraction-limited, high-resolution spectrograph connected by single-mode fiber to the 200 inch Hale telescope at Palomar Observatory. Here, we present on-sky results for HD 189733 obtained during PARVI’s commissioning phase. We first describe implementation of our spectral extraction and radial velocity (RV) generation codes. Through RV monitoring, detect Rossiter–Mclaughlin signal transiting planet b. further presence water carbon...
HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R 100,000 spectroscopy between 0.98 – 2.5 μm, will enable of transiting and non-transiting exoplanets in close orbits, direct high-contrast detection spatially separated substellar companions, exoplanet dynamical mass orbit measurements using precision radial velocity monitoring calibrated with suite state-of-the-art absolute relative wavelength references....
We describe the data reduction pipeline (DRP) for Palomar Radial Velocity instrument (PARVI). PARVI is a fiber-fed, high-resolution J and H band spectrometer that targets cool, low-mass stars purpose of measuring precise radial velocities to determine companion masses. The spectrograph fed with four single-mode fibers records science laser frequency comb wavelength reference spectra simultaneously. report on performances process from two-dimensional image acquisition reduced,...
Abstract Ground-based Precision Radial Velocity (PRV) measurements are inevitably impeded by contamination from telluric absorption features, particularly in the infrared region. Thus, it is crucial to improve modeling of features down spectral noise level. As part efforts towards improved PRV measurements, we have taken an existing atmospheric trace gas retrieval algorithm (GFIT) and successfully adapted fit stellar spectra level (typically ∼1%). We established a fitting processing...
A new wave of precision radial velocity instruments will open the door to exploring populations companions low mass stars. The Palomar Radial Velocity Instrument (PARVI) be optimized detect signals cool K and M stars with an instrument floor 30 cm/s. PARVI operate in $\lambda = 1.2-1.8$ $\rm{\mu m}$ wavelength range a spectral resolution $\lambda/\Delta\lambda$ $\sim$100,000. It on 5.1 m Hale telescope use Palomar's PALM-3000 adaptive optics system, single-mode fibers, H band laser frequency...
HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R=100,000 between 0.98 - 2.5 um, will enable spectroscopy of transiting and non-transiting exoplanets in close orbits, direct high-contrast detection spatially separated substellar companions, exoplanet dynamical mass orbit measurements using precision radial velocity monitoring calibrated with suite state-of-the-art absolute relative wavelength references....
The field of precision radial velocities (PRVs) aims to detect velocity (RV) signals on the order 1 m/s. motivation for push into PRV is reflex motion stars induced by Earth-sized orbiting planets. Measuring PRVs in near-infrared (NIR) provides a number advantages over optical, such as reduced noise from stellar jitter, and wealth RV information encoded NIR absorption features cool, low-mass stars. Palomar Radial Velocity Instrument (PARVI) implements three key strategies achieve m/s NIR:...