A5082072491- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Spacecraft Design and Technology
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Atmospheric and Environmental Gas Dynamics
- Astronomical Observations and Instrumentation
- Semiconductor materials and devices
- Advancements in Photolithography Techniques
- Probabilistic and Robust Engineering Design
- Parallel Computing and Optimization Techniques
- Meteorological Phenomena and Simulations
- Cosmology and Gravitation Theories
- Satellite Communication Systems
- Mechanical and Optical Resonators
- Caching and Content Delivery
- Advanced MEMS and NEMS Technologies
- Seismic Waves and Analysis
- Spectroscopy and Chemometric Analyses
- Pulsars and Gravitational Waves Research
- Spacecraft Dynamics and Control
Space Telescope Science Institute
2019-2022
Brown University
2016-2020
John Brown University
2018-2020
University of Arizona
2020
The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and origins life by revealing atmospheric compositions, structures, dynamics transiting exoplanets in unprecedented detail. However, high-precision, timeseries observations required for such investigations have unique technical challenges, prior experience with Hubble, Spitzer, other facilities indicates that there will be a steep learning curve when JWST becomes operational. In this...
The James Webb Space Telescope (JWST) will likely revolutionize transiting exoplanet atmospheric science, due to a combination of its capability for continuous, long duration observations and larger collecting area, spectral coverage, resolution compared existing space-based facilities. However, it is unclear precisely how well JWST perform which myriad instruments observing modes be best suited studies. In this article, we describe prefatory Early Release Science (ERS) Cycle 1 program that...
Atmospheric temperature and planetary gravity are thought to be the main parameters affecting cloud formation in giant exoplanet atmospheres. Recent attempts understand have explored wide regions of equilibrium temperature-gravity parameter space. In this study, we instead compare case two planets with nearly identical ($T_\mathrm{eq}$ $\sim 1050 \, \mathrm{K}$) ($g \sim 10 \mathrm{m s}^{-1})$. During $HST$ Cycle 23, collected WFC3/G141 observations planets, WASP-67 b HAT-P-38 b. b, mass...
Secondary eclipse observations of hot Jupiters can reveal both their compositions and thermal structures. Previous have shown a diversity Jupiter spectra, including absorption features, emission featureless blackbody-like spectra. We present secondary spectrum the WASP-77Ab observed between $1-5$ $\mu$m with Hubble Space Telescope (HST) Spitzer Telescope. The HST show signs water indicative non-inverted structure. fit data one-dimensional free retrieval grid self-consistent forward models to...
As part of the PanCET program, we have conducted a spectroscopic study WASP-79b, an inflated hot Jupiter orbiting F-type star in Eridanus with period 3.66 days. Building on original WASP and TRAPPIST photometry Smalley et al (2012), examine HST/WFC3 (1.125 - 1.650 $\mu$m), Magellan/LDSS-3C (0.6 1 $\mu$m) data, Spitzer data (3.6 4.5 $\mu$m). Using from all three instruments, constrain water abundance to be --2.20 $\leq$ log(H$_2$O) --1.55. We present these results along atmospheric retrieval...
Abstract Observations and models of transiting hot Jupiter exoplanets indicate that atmospheric circulation features may cause large spatial flux contrasts across their daysides. Previous studies have mapped these variations through inversion secondary eclipse data. Though mapping requires high signal-to-noise data, the first successful map—made for HD 189733b using 8 μ m Spitzer IRAC data—showed promise method. JWST observations provide requisite data quality to access unique advantages...
Abstract We present observations of WASP-63b by the Hubble Space Telescope (HST) as part “A Preparatory Program to Identify Single Best Transiting Exoplanet for James Webb ( JWST ) Early Release Science (ERS).” is one community targets under consideration ERS program. a spectrum derived from single observation HST Wide Field Camera 3 in near-infrared. engaged groups across transiting exoplanet participate analysis data and results each. Extraction transmission several independent analyses...
Optical, reflected light eclipse observations provide a direct probe of the exoplanet scattering properties, such as from aerosols. We present here photometric, WASP-43b using HST WFC3/UVIS instrument with F350LP filter (346-822nm) encompassing entire optical band. This is first light, photometric UVIS in scanning mode; we further detail our extraction and analysis pipeline Arctor. Our curve for WASP-43 b derived 3-{\sigma} upper limit 67 ppm on depth, which implies that has very dark...
Here we present the analysis of multi-epoch secondary eclipse observations HD 189733b and 209458b as a probe temporal variability in planetary climate using both Spitzer channels 1 2 (3.6 4.5 um). Constraining will inform models identify physical processes occurring at either length scales too small to directly observe or pressure levels that are inaccessible transit observations. We do not detect statistically significant able place useful upper limits on IR amplitudes these atmospheres....
Abstract Recent mid-infrared observations with JWST's Mid-Infrared Instrument Low Resolution Spectrometer (MIRI LRS) have resulted in the first direct detections of absorption features from silicate clouds transmission spectra two transiting exoplanets, WASP-17 b and WASP-107 b. In this Letter, we measure (5–12 μ m) dayside emission spectrum benchmark hot Jupiter HD 189733 MIRI LRS by combining data secondary-eclipse observations. We confirm previous detection H 2 O at 6.5 m Spitzer's...
ABSTRACT We measure the 4.5 μ m thermal emission of five transiting hot Jupiters, WASP-13b, WASP-15b, WASP-16b, WASP-62b, and HAT-P-22b using channel 2 Infrared Array Camera (IRAC) on Spitzer Space Telescope . Significant intrapixel sensitivity variations in IRAC data require careful correction order to achieve precision several hundred parts per million (ppm) for measurement exoplanet secondary eclipses. determine eclipse depths by first correcting raw three independent reduction methods....
Recently, we have witnessed the rise of novel ``event-based'' camera sensors for high-speed, low-power video capture. Rather than recording discrete image frames, these output asynchronous ``event'' tuples with microsecond precision, only when brightness change a given pixel exceeds certain threshold. Although enabled compelling new computer vision applications, applications often require expensive, power-hungry GPU systems, rendering them incompatible deployment on devices which event...
Abstract Upcoming NASA astrophysics missions such as the James Webb Space Telescope will search for signs of life on planets transiting nearby stars. Doing so require coadding dozens transmission spectra to build up sufficient signal noise while simultaneously accounting challenging systematic effects surface/weather variability, atmospheric refraction, and stellar activity. To determine magnitude impacts both planet variability measured spectra, we must assess feasibility stacking multiple...
Although there are a large number of known exoplanets, is little data on their global atmospheric properties. Phase-resolved spectroscopy transiting planets – continuous spectroscopic observation during full orbits probes varied depths and longitudes in the atmospheres thus measuring three-dimensional thermal chemical structure contributing to our understanding circulation. Planets with characteristics suitable for characterization have several days, so phase curve observations highly...
Abstract Here we present a thermal emission spectrum of WASP-79b, obtained via Hubble Space Telescope Wide Field Camera 3 G141 observations as part the PanCET program. As did not observe ingress or egress WASP-79b’s secondary eclipse, consider two scenarios: fixed mid-eclipse time based on expected occurrence time, and free parameter. In both scenarios, can measure from WASP-79b 1.1 to 1.7 μ m at 2.4 σ confidence consistent with 1900 K brightness temperature for planet. We combine our...
Although there exists a large sample of known exoplanets, little data that can be used to study their global atmospheric properties. This deficiency addressed by performing phase-resolved spectroscopy — continuous spectroscopic observations planet’s entire orbit about its host star transiting exoplanets. Planets with characteristics suitable for characterization have orbits several days, thus phase curve are highly resource intensive, especially shared use facilities. In this work, we show...