A5061017283- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Nuclear physics research studies
- Historical Astronomy and Related Studies
- Mass Spectrometry Techniques and Applications
- Mechanical and Optical Resonators
- Quantum optics and atomic interactions
- Nuclear Physics and Applications
- Laser-Matter Interactions and Applications
- Marine and environmental studies
- Astronomy and Astrophysical Research
University of Missouri–St. Louis
2019-2023
Max Planck Institute for Solar System Research
2011-2013
Technische Universität Braunschweig
2011-2013
Abstract Comet C/2017 K2 (Pan-STARRS) provided a rare opportunity to investigate the evolution of coma composition and outgassing patterns over transitional heliocentric distance ( R h ) range where activity drivers in comets are thought change from “hypervolatile” (CO, CH 4 , C 2 H 6 and/or CO )-dominated O-dominated. We performed high-resolution <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>λ</mml:mi> </mml:math> / <mml:mi...
We present a comprehensive analysis of the chemical composition Jupiter-family comet and potential spacecraft target 46P/Wirtanen, in near-IR wavelength range. used iSHELL at NASA Infrared Telescope Facility to observe on 11 pre-, near-, postperihelion dates 2018 December 2019 January February during its historic apparition. report rotational temperatures, production rates, mixing ratios with respect H2O C2H6 or 3σ upper limits primary volatiles H2O, HCN, CH4, C2H6, CH3OH, H2CO, NH3, CO,...
Context. Measurements of the polarized reflected sunlight from atmosphereless solar system bodies, over a range phase angles, provide information about surface structure and composition.
Abstract We present the results of a radial velocity survey young stellar objects (YSOs) in early stages evolution core L1688 molecular cloud. New and archival spectra obtained with four high-resolution infrared spectrographs were analyzed using Markov chain Monte Carlo techniques that simultaneously fit for velocity, T eff , v sin i veiling by comparison synthetic spectra. The distribution 32 objects, most Class I or flat-spectrum spectral energy distributions, is marginally Gaussian,...
Abstract High-resolution near-infrared ground-based spectroscopic observations of comet 67P/Churyumov–Gerasimenko near its maximum activity in 2021 were conducted from the W. M. Keck Observatory, using facility spectrograph NIRSPEC. 67P is best-studied to date because unprecedented detail and insights provided by Rosetta mission during 2014–2016. Because only where detailed abundances many coma volatiles measured situ, determining composition ground provides a unique opportunity interpret...
Abstract We report production rates of H 2 O and nine trace molecules (C 6 , CH 4 CO, 3 OH, HCN, NH C OCS, CO) in long-period comet C/2020 S3 (Erasmus) using the high-resolution, cross-dispersed infrared spectrograph (iSHELL) at NASA Infrared Telescope Facility, on two pre-perihelion dates heliocentric distances R h = 0.49 0.52 au. Our molecular abundances with respect to simultaneously or contemporaneously measured indicate that is depleted OH compared its mean abundance relative among...
Context. Like many other atmosphereless solar system bodies, Iapetus exhibits a phenomenon of negative polarization at small phase angles, which can be modeled using theoretical approaches that consider interaction light with complex medium.
Context. The surface properties of atmosphereless solar system objects can be constrained by investigating the nature polarized light scattered from their surfaces.
Jupiter-family comets (JFCs) are dynamically-sourced in the scattered Kuiper disk, and generally less productive than Oort Cloud (OCCs). For this reason, JFCs have been underrepresented ground-based observations of volatiles, such as C2H2, C2H6, CH3OH, HCN, H2O, NH3, H2CO, especially CO CH4, for which large Doppler shifts needed to offset cometary lines from their telluric counterpart absorptions.The period since 2017 has encompassed some best apparitions modern history. These benefitted...
Comet C/2017 K2 (Pan-STARRS) provided a rare opportunity to investigate the evolution of coma composition and outgassing patterns over transitional heliocentric distance (Rh) range where activity drivers in comets are thought change from "hypervolatile" (CO, CH$_4$, C$_2$H$_6$, and/or CO$_2$)-dominated H2O-dominated. We performed high-resolution, cross-dispersed, near-infrared spectroscopy with iSHELL at NASA Infrared Telescope Facility (IRTF) NIRSPEC W. M. Keck 2 Observatory. report gas...
Physical characterization of Trans-Neptunian objects, a primitive population the outer solar system, may provide constraints on their formation and evolution. The goal this work is to characterize set 15 scattered disk (SDOs) detached in terms size, albedo, thermal properties. Thermal flux measurements obtained with Herschel-PACS instrument at 70, 100 160 μm, whenever applicable, Spitzer-MIPS 24 70 are modeled radiometric techniques, order derive objects' individual albedo when possible...