Kyle Kaplan
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View article: Rubidium Abundances in Cool Giants from High-resolution H-band Spectra : A New Diagnostic for Galactic Chemical Evolution
Rubidium Abundances in Cool Giants from High-resolution H-band Spectra : A New Diagnostic for Galactic Chemical Evolution Open
The Galactic center and inner disk of the Milky Way contain complex stellar populations obscured by heavy dust extinction. To study their chemical composition, high-resolution near-infrared (near-IR) spectroscopy is necessary. Expanding th…
View article: Rubidium Abundances in Cool Giants from High-Resolution H-band Spectra: A New Diagnostic for Galactic Chemical Evolution
Rubidium Abundances in Cool Giants from High-Resolution H-band Spectra: A New Diagnostic for Galactic Chemical Evolution Open
The Galactic Center and inner disk of the Milky Way contain complex stellar populations obscured by heavy dust extinction. To study their chemical composition, high-resolution near-infrared (near-IR) spectroscopy is necessary. Expanding th…
View article: <i>JWST</i> observations of the Ring Nebula (NGC 6720) – II. PAH emission
<i>JWST</i> observations of the Ring Nebula (NGC 6720) – II. PAH emission Open
Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in clumpy circumstellar environments, yet their formation and evolutionary pathways in such environments remain elusive. We aim to characterize the PAH emissi…
View article: JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star
JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star Open
The planetary nebula NGC 6720, also known as the “Ring Nebula,” is one of the most iconic examples of nearby planetary nebulae whose morphologies present a challenge to our theoretical understanding of the processes that govern the deaths …
View article: 10 Years of Archival High-resolution NIR Spectra: The Raw and Reduced IGRINS Spectral Archive (RRISA)
10 Years of Archival High-resolution NIR Spectra: The Raw and Reduced IGRINS Spectral Archive (RRISA) Open
The Immersion GRating INfrared Spectrometer (IGRINS) is a compact, high-resolution ( R ∼ 45,000) near-infrared spectrograph spanning 1.45–2.45 μ m in a single exposure. We introduce the Raw and Reduced IGRINS Spectral Archive (RRISA), whic…
View article: High spectral resolution observations of Uranus' near-IR thermospheric H2 emission spectrum using the IGRINS spectrograph during the 2018 and 2023 apparitions
High spectral resolution observations of Uranus' near-IR thermospheric H2 emission spectrum using the IGRINS spectrograph during the 2018 and 2023 apparitions Open
View article: gollum: An intuitive programmatic and visual interfacefor precomputed synthetic spectral model grids
gollum: An intuitive programmatic and visual interfacefor precomputed synthetic spectral model grids Open
Shankar et al., (2024). gollum: An intuitive programmatic and visual interface for precomputed synthetic spectral model grids. Journal of Open Source Software, 9(100), 6601, https://doi.org/10.21105/joss.06601
View article: Composition of Giants 1° North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS
Composition of Giants 1° North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS Open
We report the first high-resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within 1° of the Galactic plane, where high extinction has rendered such studies challenging. Our high-signal-to-noise-ratio and h…
View article: Composition of Giants 1$^{\circ}$ North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS
Composition of Giants 1$^{\circ}$ North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS Open
We report the first high resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within $1^\circ$ of the Galactic plane, where high extinction has rendered such studies challenging. Our high S/N and high-resolut…
View article: <i>JWST</i> observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
<i>JWST</i> observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs Open
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 to 25 $\, \mu$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H2, with a characterist…
View article: JWST imaging observations of the Ring Nebula
JWST imaging observations of the Ring Nebula Open
We present JWST images of NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 μ m to 25 μ m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H 2 , with a characteristic diameter of 0.2 arcsec and de…
View article: JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs Open
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6$μ$m to 25 $μ$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H$_2$, with a characteri…
View article: ZODIACAL EXOPLANETS IN TIME (ZEIT). I. A NEPTUNE-SIZED PLANET ORBITING AN M4.5 DWARF IN THE HYADES STAR CLUSTER
ZODIACAL EXOPLANETS IN TIME (ZEIT). I. A NEPTUNE-SIZED PLANET ORBITING AN M4.5 DWARF IN THE HYADES STAR CLUSTER Open
Studying the properties of young planetary systems can shed light on how the dynamics and structure of planets evolve during their most formative years. Recent K2 observations of nearby young clusters (10-800 Myr) have facilitated the disc…
View article: The igrins yso survey. i. stellar parameters of pre-main-sequence stars in taurus- auriga
The igrins yso survey. i. stellar parameters of pre-main-sequence stars in taurus- auriga Open
We present fundamental parameters for 110 canonical K- and M-type (1.3-0.13Me) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination of effective temperature (Teff), surface gravity (log g), magneti…
View article: Astronomical échelle spectroscopy data analysis withmuler
Astronomical échelle spectroscopy data analysis withmuler Open
Modern astronomical échelle spectrographs produce information-rich 2D echellograms that undergo standard reduction procedures to produce extracted 1D spectra.The final postprocessing steps of these 1D spectra are often left to the end-user…
View article: Chemical evolution of ytterbium in the Galactic disk
Chemical evolution of ytterbium in the Galactic disk Open
Context . Measuring the abundances of neutron-capture elements in Galactic disk stars is an important part of understanding key stellar and galactic processes. In the optical wavelength regime a number of different neutron-capture elements…
View article: The IGRINS YSO Survey. I. Stellar Parameters of Pre-main-sequence Stars in Taurus-Auriga
The IGRINS YSO Survey. I. Stellar Parameters of Pre-main-sequence Stars in Taurus-Auriga Open
We present fundamental parameters for 110 canonical K - and M -type (1.3−0.13 M ⊙ ) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination of effective temperature ( T eff ), surface gravity (log g )…
View article: A Near-infrared Survey of UV-excited Molecular Hydrogen in Photodissociation Regions
A Near-infrared Survey of UV-excited Molecular Hydrogen in Photodissociation Regions Open
We present a comparative study of the near-infrared (NIR) H 2 line emission from five regions near hot young stars: Sharpless 140, NGC 2023, IC 63, the Horsehead Nebula, and the Orion Bar. This emission originates in photodissociation or p…
View article: Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy
Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy Open
We have used the Habitable Zone Planet Finder (HPF) to gather high-resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal branch (RHB) stars, one open cluster giant, and one very metal-poor halo red giant. The HP…
View article: Evidence for He i 10830 Å Absorption during the Transit of a Warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder
Evidence for He i 10830 Å Absorption during the Transit of a Warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder Open
Understanding the dynamics and kinematics of outflowing atmospheres of hot and warm exoplanets is crucial to understanding the origins and evolutionary history of the exoplanets near the evaporation desert. Recently, ground-based measureme…
View article: Solar Contamination in Extreme-precision Radial-velocity Measurements: Deleterious Effects and Prospects for Mitigation
Solar Contamination in Extreme-precision Radial-velocity Measurements: Deleterious Effects and Prospects for Mitigation Open
Solar contamination, due to moonlight and atmospheric scattering of sunlight, can cause systematic errors in stellar radial velocity (RV) measurements that significantly detract from the ∼10 cm s −1 sensitivity required for the detection a…
View article: The VIRUS-P Exploration of Nearby Galaxies (VENGA): the stellar populations and assembly of NGC 2903’s bulge, bar, and outer disc
The VIRUS-P Exploration of Nearby Galaxies (VENGA): the stellar populations and assembly of NGC 2903’s bulge, bar, and outer disc Open
We study the stellar populations and assembly of the nearby spiral galaxy NGC 2903’s bulge, bar, and outer disc using the VIRUS-P Exploration of Nearby Galaxies IFS survey. We observe NGC 2903 with a spatial resolution of 185 pc using the …
View article: Impact of crosshatch patterns in H2RGs on high-precision radial velocity measurements: exploration of measurement and mitigation paths with the Habitable-Zone Planet Finder
Impact of crosshatch patterns in H2RGs on high-precision radial velocity measurements: exploration of measurement and mitigation paths with the Habitable-Zone Planet Finder Open
Teledyne’s H2RG detector images suffer from crosshatch like patterns, which arise from subpixel quantum efficiency (QE) variation. We present our measurements of this subpixel QE variation in the Habitable-Zone Planet Finder’s H2RG detecto…
View article: Ultrastable environment control for the NEID spectrometer: design and performance demonstration
Ultrastable environment control for the NEID spectrometer: design and performance demonstration Open
Two key areas of emphasis in contemporary experimental exoplanet science are the detailed characterization of transiting terrestrial planets and the search for Earth analog planets to be targeted by future imaging missions. Both of these p…
View article: Impact of crosshatch patterns in H2RGs on high precision radial velocity measurements: Exploration of measurement and mitigation paths with HPF
Impact of crosshatch patterns in H2RGs on high precision radial velocity measurements: Exploration of measurement and mitigation paths with HPF Open
Teledyne's H2RG detector images suffer from cross-hatch like patterns which arises from sub-pixel quantum efficiency (QE) variation. In this paper we present our measurements of this sub-pixel QE variation in the Habitable-Zone Planet Find…
View article: Ultra-Stable Environment Control for the NEID Spectrometer: Design and\n Performance Demonstration
Ultra-Stable Environment Control for the NEID Spectrometer: Design and\n Performance Demonstration Open
Two key areas of emphasis in contemporary experimental exoplanet science are\nthe detailed characterization of transiting terrestrial planets, and the search\nfor Earth analog planets to be targeted by future imaging missions. Both of\nthe…
View article: Ultra-Stable Environment Control for the NEID Spectrometer: Design and Performance Demonstration
Ultra-Stable Environment Control for the NEID Spectrometer: Design and Performance Demonstration Open
Two key areas of emphasis in contemporary experimental exoplanet science are the detailed characterization of transiting terrestrial planets, and the search for Earth analog planets to be targeted by future imaging missions. Both of these …
View article: IGRINS Spectral Library
IGRINS Spectral Library Open
We present a library of high-resolution ( R ≡ λ /Δ λ ∼ 45,000) and high signal-to-noise ratio (S/N ≥ 200) near-infrared spectra for stars of a wide range of spectral types and luminosity classes. The spectra were obtained with the Immersio…
View article: The Habitable-Zone Planet Finder: improved flux image generation algorithms for H2RG up-the-ramp data
The Habitable-Zone Planet Finder: improved flux image generation algorithms for H2RG up-the-ramp data Open
Noise and stability of current state of the art near-infrared (NIR) array detectors are still substantially worse than optical science grade CCDs used in astronomy. Obtaining the maximum signal-to-noise ratio in flux image is important for…
View article: Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b
Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b Open
Context. Stellar activity is currently challenging the detection of young planets via the radial velocity (RV) technique. Aims. We attempt to definitively discriminate the nature of the RV variations for the young active K5 star BD+20 1790…