Taylor Venenciano
A5008239515- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Space Exploration and Technology
- Mass Spectrometry Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Inertial Sensor and Navigation
- Isotope Analysis in Ecology
- Experimental and Theoretical Physics Studies
- Micro and Nano Robotics
- Spacecraft Design and Technology
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Communication and Nanonetworks
- Gamma-ray bursts and supernovae
- Space Satellite Systems and Control
- Geochemistry and Geologic Mapping
Pomona College
2022-2024
European Organization for Nuclear Research
2023
California Institute of Technology
2022
Abstract M dwarfs are common host stars to exoplanets but often lack atmospheric abundance measurements. Late-M also good analogs the youngest substellar companions, which share similar T eff ∼ 2300–2800 K. We present analyses for M7.5 companion HIP 55507 B and its K6V primary star with Keck/KPIC high-resolution ( R 35,000) K -band spectroscopy. First, by including KPIC relative radial velocities between secondary in orbit fit, we improve dynamical mass precision 60% find <?CDATA...
Direct imaging studies have mainly used low-resolution spectroscopy ($R\sim20-100$) to study the atmospheres of giant exoplanets and brown dwarf companions, but presence clouds has often led degeneracies in retrieved atmospheric abundances (e.g. C/O, metallicity). This precludes clear insights into formation mechanisms these companions. The Keck Planet Imager Characterizer (KPIC) uses adaptive optics single-mode fibers transport light NIRSPEC ($R\sim35,000$ $K$ band), aims address challenges...
Abstract The detection of satellites around extrasolar planets, so called exomoons, remains a largely unexplored territory. In this work, we study the potential detecting these elusive objects from radial velocity monitoring self-luminous, directly imaged planets. This technique is now possible thanks to development dedicated instruments combining power high-resolution spectroscopy and high-contrast imaging. First, demonstrate sensitivity with mass ratio 1%–4% at separations similar Galilean...
Abstract We present high-resolution K -band emission spectra of the quintessential hot Jupiter HD 189733 b from Keck Planet Imager and Characterizer. Using a Bayesian retrieval framework, we fit dayside pressure–temperature profile, orbital kinematics, mass-mixing ratios H 2 O, CO, CH 4 , NH 3 HCN, S, 13 CO/ 12 CO ratio. measure mass fractions <?CDATA ${\mathrm{logH}}_{2}{\rm{O}}=-{2.0}_{-0.4}^{+0.4}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub>...
Abstract We present Keck/KPIC Phase II K -band observations of the nontransiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make first detection planetary atmosphere at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>K</mml:mi> <mml:mi mathvariant="normal">p</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>18</mml:mn> <mml:msubsup> <mml:mn>5</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>13</mml:mn> </mml:mrow>...
Abstract A benchmark brown dwarf (BD) is a BD whose properties (e.g., mass and chemical composition) are precisely independently measured. Benchmark BDs valuable in testing theoretical evolutionary tracks, spectral synthesis, atmospheric retrievals for substellar objects. Here, we report results of retrieval on synthetic spectrum BD, HR 7672 B, with petitRADTRANS . First, test the framework PHOENIX BT-Settl solar composition. We show that retrieved C O abundances consistent values, but C/O...
Abstract We present Keck Planet Imager and Characterizer (KPIC) high-resolution ( R ∼35,000) K -band thermal emission spectroscopy of the ultrahot Jupiter WASP-33b. The use KPIC’s single-mode fibers greatly improves both blaze line-spread stabilities relative to slit spectrographs, enhancing cross-correlation detection strength. retrieve dayside spectrum with a nested-sampling pipeline, which fits for orbital parameters, atmospheric pressure–temperature profile, molecular abundances....
The formation and evolution pathway for the directly-imaged multi-planetary system HR 8799 remains mysterious. Accurate constraints on chemical composition of planetary atmosphere(s) are key to solving mystery. We perform a detailed atmospheric retrieval 8799~c infer abundances abundance ratios using combination photometric data along with low- high-resolution spectroscopic (R$\sim$20-35,000). specifically retrieve [C/H], [O/H], C/O find them be 0.55$^{+0.36}_{-0.39}$,...
Abstract We present atmospheric retrievals from Keck/KPIC Phase II observations of the ultrahot Jupiter (UHJ) KELT-20/MASCARA-2 b. Previous free molecular abundances for UHJs have been impacted by significant model biases due to variations in vertical abundance profiles, which we address including dissociation into our retrieval framework as an additional parameter. measure CO ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:msub>...
The Keck Planet Imager and Characterizer (KPIC) is a series of upgrades for the II Adaptive Optics (AO) system NIRSPEC spectrograph to enable diffraction-limited, high-resolution ($R>30,000$) spectroscopy exoplanets low-mass companions in K L bands. Phase I consisted single-mode fiber injection/extraction units (FIU/FEU) used conjunction with an H-band pyramid wavefront sensor. II, deployed commissioned 2022, adds 1000-actuator deformable mirror, beam-shaping optics, vortex coronagraph,...
We present an atmospheric characterization and orbital analysis of HD 206893 B, exceptionally red, L/T-transition substellar companion in a multiplanetary system, via Keck Planet Imager Characterizer (KPIC) high-resolution (R $\sim$ 35,000) K-band spectroscopy. Using PHOENIX models forward-model framework that fits the spectrum diffracted starlight simultaneously, we detect B at $>8\sigma$ significance cross-correlation two epochs. find effective temperature for $1634^{+72}_{-38}$ K log(g)...
Abstract We present an atmospheric characterization and orbital analysis of HD 206893 B, exceptionally red, L/T-transition substellar companion in a multiplanetary system, via Keck Planet Imager Characterizer (KPIC) high-resolution ( R ∼ 35,000) K- band spectroscopy. Using PHOENIX models forward-model framework that fits the spectrum diffracted starlight simultaneously, we detect B at >8 σ significance cross correlation two epochs. find effective temperature for 1634 <mml:math...
The Keck Planet Imager and Characterizer (KPIC) combines high contrast imaging with resolution spectroscopy (R∼35,000 in K band) to study directly imaged exoplanets brown dwarfs unprecedented detail.KPIC aims spectrally characterize substellar companions through measurements of planetary radial velocities, spins, atmospheric composition.Currently, the dominant source systematic noise for KPIC is fringing, or oscillations spectrum as a function wavelength.The fringing signal can dominate...
KPIC (Keck Planet Imager and Characterizer) is a series of upgrades to Keck II adaptive optics the NIR-SPEC spectrograph enabling K-band diffraction-limited high-resolution spectroscopy. KPIC's single-mode fibers provide substantial reduction in sky background as well an extremely stable line-spread function. In this paper we present on-sky performance phase I lessons learned from calibration operation system, including procedures for maximizing throughput assessments long-term stability....
ISOLDE's Offline 2 laboratory has been upgraded to facilitate development for the production and study of molecular ion beams. New gas injection systems have implemented both formation in source radio-frequency quadrupole trap used beam preparation. MagneToF detectors time-resolved single counting data acquisition low intensity beams studies laser-atom or laser-molecule interactions. We present a ionization BaF+ using facility.
Abstract GQ Lup B is one of the few substellar companions with a detected cicumplanetary disk (CPD). Observations CPD suggest presence cavity, possibly formed by an exosatellite. Using Keck Planet Imager and Characterizer (KPIC), high-contrast imaging suite that feeds high-resolution spectrograph (1.9–2.5 µ m, R ∼35,000), we present first dedicated radial velocity (RV) observations around high-contrast, directly imaged companion, B, to search for exosatellites. Over 11 epochs, find best...
M dwarfs are common host stars to exoplanets but often lack atmospheric abundance measurements. Late-M also good analogs the youngest substellar companions, which share similar $T_{\rm eff}\sim2300-2800~K$. We present analyses for M7.5 companion HIP 55507 B and its K6V primary star with Keck/KPIC high-resolution ($R\sim35,000$) $K$ band spectroscopy. First, by including KPIC relative radial velocities between secondary in orbit fit, we improve dynamical mass precision 60% find...
We describe a pandemic-inspired, modern physics distance lab course, focused both on engaging undergraduate majors in scientific research from their homes and building skills paper reading writing. To introduce the experimental analytic tools, students are first asked to complete traditional assignment which collections of Hexbugs™, randomly moving toy automatons, used model gas molecules confirm ideal law. Subsequently, after consulting literature, propose implement semester-long...
GQ Lup B is one of the few substellar companions with a detected cicumplanetary disk, or CPD. Observations CPD suggest presence cavity, possibly formed by an exo-satellite. Using Keck Planet Imager and Characterizer (KPIC), high contrast imaging suite that feeds resolution spectrograph (1.9-2.5 microns, R$\sim$35,000), we present first dedicated radial velocity (RV) observations around high-contrast, directly imaged companion, B, to search for exo-satellites. Over 11 epochs, find best median...
We present Keck/KPIC phase II $K$-band observations of the non-transiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make first detection planetary atmosphere at $K_p = 185^{+11}_{-13}\rm km\ s^{-1}$ and an inferior conjunction time 2.5 hours before previously-published ephemeris. The retrieved $K_p$ value, in combination with orbital period, mass host star, lack transit detection, gives inclination $78^{\circ+2}_{-12}$ true planet 1.23$\pm0.10\rm\ M_J$. While...
The detection of satellites around extrasolar planets, so called exomoons, remains a largely unexplored territory. In this work, we study the potential detecting these elusive objects from radial velocity monitoring self-luminous directly imaged planets. This technique is now possible thanks to development dedicated instruments combining power high-resolution spectroscopy and high-contrast imaging. First, demonstrate sensitivity with mass ratio 1-4% at separations similar Galilean moons...
We present Keck/KPIC high-resolution ($R\sim35,000$) $K$-band thermal emission spectroscopy of the ultra-hot Jupiter WASP-33b. The use KPIC's single-mode fibers greatly improves both blaze and line-spread stabilities relative to slit spectrographs, enhancing cross-correlation detection strength. retrieve dayside spectrum with a nested sampling pipeline which fits for orbital parameters, atmospheric pressure-temperature profile, molecular abundances.We strongly detect thermally-inverted...
We present high-resolution $K$-band emission spectra of the quintessential hot Jupiter HD 189733 b from Keck Planet Imager and Characterizer (KPIC). Using a Bayesian retrieval framework, we fit dayside pressure-temperature profile, orbital kinematics, mass-mixing ratios H$_2$O, CO, CH$_4$, NH$_3$, HCN, H$_2$S, $\rm ^{13}CO/^{12}CO$ ratio. measure mass fractions \log H_2O = -2.0^{+0.4}_{-0.4}$ CO -2.2^{+0.5}_{-0.5}$, place upper limits on remaining species. Notably, find CH_4 < -4.5$ at 99\%...
The formation and evolution pathway for the directly-imaged multi-planetary system HR 8799 remains mysterious. Accurate constraints on chemical composition of planetary atmosphere(s) are key to solving mystery. We perform a detailed atmospheric retrieval 8799~c infer abundances abundance ratios using combination photometric data along with low- high-resolution spectroscopic (R$\sim$20-35,000). specifically retrieve [C/H], [O/H], C/O find them be 0.55$^{+0.36}_{-0.39}$,...
Direct imaging studies have mainly used low-resolution spectroscopy ($R\sim20-100$) to study the atmospheres of giant exoplanets and brown dwarf companions, but presence clouds has often led degeneracies in retrieved atmospheric abundances (e.g. C/O, metallicity). This precludes clear insights into formation mechanisms these companions. The Keck Planet Imager Characterizer (KPIC) uses adaptive optics single-mode fibers transport light NIRSPEC ($R\sim35,000$ $K$ band), aims address challenges...