Tiffany Kataria
A5064923836- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Atmospheric and Environmental Gas Dynamics
- Superconducting and THz Device Technology
- Spacecraft Design and Technology
- Radio Astronomy Observations and Technology
- History and Developments in Astronomy
- Technology Assessment and Management
- Meteorological Phenomena and Simulations
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric aerosols and clouds
- Scientific Research and Discoveries
Jet Propulsion Laboratory
2016-2025
Space Research Institute
2022
Austrian Academy of Sciences
2022
Space Telescope Science Institute
2017-2021
Goddard Space Flight Center
2018-2021
California Institute of Technology
2021
Ames Research Center
2021
University of Arizona
2010-2020
Stony Brook University
2019
University of Exeter
2015-2017
The water abundance in a planetary atmosphere provides key constraint on the planet's primordial origins because ice is expected to play an important role core accretion model of planet formation. However, content Solar System giant planets not well known sequestered clouds deep their atmospheres. By contrast, short-period exoplanets have such high temperatures that atmospheres gas phase, making it possible measure for these objects. We present precise determination 2 $M_\mathrm{Jup}$...
Exoplanets that orbit close to their host stars are much more highly irradiated than Solar System counterparts. Understanding the thermal structures and appearances of these planets requires investigating how atmospheres respond such extreme stellar forcing. We present spectroscopic emission measurements as a function orbital phase ("phase-curve observations") for highly-irradiated exoplanet WASP-43b spanning three full planet rotations using Hubble Space Telescope. With data, we construct...
We present a primary transit observation for the ultra-hot (Teq ∼ 2400 K) gas giant expolanet WASP-121b, made using Hubble Space Telescope Wide Field Camera 3 in spectroscopic mode across 1.12–1.64 μm wavelength range. The 1.4 water absorption band is detected at high confidence (5.4σ) planetary atmosphere. also reanalyze ground-based photometric light curves taken B, r', and z' filters. Significantly deeper transits are measured these optical bandpasses relative to near-infrared...
Transmission spectroscopy1-3 of exoplanets has revealed signatures water vapour, aerosols and alkali metals in a few dozen exoplanet atmospheres4,5. However, these previous inferences with the Hubble Spitzer Space Telescopes were hindered by observations' relatively narrow wavelength range spectral resolving power, which precluded unambiguous identification other chemical species-in particular primary carbon-bearing molecules6,7. Here we report broad-wavelength 0.5-5.5 µm atmospheric...
WASP-39b is a hot Saturn-mass exoplanet with predicted clear atmosphere based on observations in the optical and infrared. Here we complete transmission spectrum of near-infrared (NIR) over three water absorption features Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) G102 (0.8-1.1 microns) G141 (1.1-1.7 spectroscopic grisms. We measure high amplitude H2O feature centered at 1.4 microns, smaller 0.95 1.2 maximum 2.4 planetary scale heights. incorporate these new NIR measurements...
Abstract Carbon dioxide (CO 2 ) is a key chemical species that found in wide range of planetary atmospheres. In the context exoplanets, CO an indicator metal enrichment (that is, elements heavier than helium, also called ‘metallicity’) 1–3 , and thus formation processes primary atmospheres hot gas giants 4–6 . It one most promising to detect secondary terrestrial exoplanets 7–9 Previous photometric measurements transiting planets with Spitzer Space Telescope have given hints presence but not...
Deciphering the role of clouds is central to our understanding exoplanet atmospheres, as they have a direct impact on temperature and pressure structure, observational properties planet. Super-hot Jupiters occupy regime similar low mass M-dwarfs, where minimal cloud condensation expected. However, observations exoplanets such WASP-12b (Teq ~ 2500 K) result in transmission spectrum indicative cloudy atmosphere. We re-examine space occupied by these super-hot Jupiter explore initial Al-...
We analyze full-orbit phase curve observations of the transiting hot Jupiters WASP-19b and HAT-P-7b at 3.6 4.5 $\mu$m obtained using Spitzer Space Telescope. For WASP-19b, we measure secondary eclipse depths $0.485\%\pm 0.024\%$ $0.584\%\pm 0.029\%$ $\mu$m, which are consistent with a single blackbody effective temperature $2372 \pm 60$ K. The measured for $0.156\%\pm 0.009\%$ $0.190\%\pm 0.006\%$, well-described by $2667\pm 57$ Comparing curves to predictions one-dimensional...
The hot Jupiter WASP-43b (2 MJ, 1 RJ, Torb = 19.5 hr) has now joined the ranks of transiting Jupiters HD 189733b and 209458b as an exoplanet with a large array observational constraints. Because receives similar stellar flux but rotation rate four times faster higher gravity, studying probes effect gravity on circulation when irradiation is held approximately constant. Here we present three-dimensional (3D) atmospheric models WASP-43b, exploring effects composition, metallicity, frictional...
We present new 3.6 and 4.5 $μm$ Spitzer phase curves for the highly irradiated hot Jupiter WASP-33b unusually dense Saturn-mass planet HD 149026b. As part of this analysis, we develop a variant pixel level decorrelation that is effective at removing intrapixel sensitivity variations long observations (>10 hours) where position star can vary by significant fraction pixel. Using algorithm, measure eclipse depths, amplitudes, offsets both planets $μm$. use simple toy model to show WASP-33b's...
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...
A correlation between giant-planet mass and atmospheric heavy elemental abundance was first noted in the past century from observations of planets our own Solar System, has served as a cornerstone planet formation theory. Using data Hubble Spitzer Space Telescopes 0.5 to 5 microns, we conducted detailed study transiting Neptune-mass exoplanet HAT-P-26b. We detected prominent H2O absorption bands with maximum base-to-peak amplitude 525ppm transmission spectrum. water proxy for metallicity,...
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...
We present full-orbit phase curve observations of the eccentric ($e\sim 0.08$) transiting hot Jupiter WASP-14b obtained in 3.6 and 4.5 $\mu$m bands using \textit{Spitzer Space Telescope}. use two different methods for removing intrapixel sensitivity effect compare their efficacy decoupling instrumental noise. Our measured secondary eclipse depths $0.1882\%\pm 0.0048\%$ $0.2247\%\pm 0.0086\%$ at $\mu$m, respectively, are both consistent with a blackbody temperature $2402\pm 35$ K. place...
We present results from an atmospheric circulation study of nine hot Jupiters that comprise a large transmission spectral survey using the Hubble and Spitzer Space Telescopes. These observations exhibit range behavior over optical infrared wavelengths which suggest diverse cloud haze properties in their atmospheres. By utilizing specific system parameters for each planet, we naturally probe wide phase space planet radius, gravity, orbital period, equilibrium temperature. First, show our...
Previous measurements of heat redistribution efficiency (the ability to transport energy from a planet's highly irradiated dayside its eternally dark nightside) show considerable variation between exoplanets. Theoretical models predict positive correlation and temperature for tidally locked planets; however, recent HST WASP-43b spectroscopic phase curve results are inconsistent with current predictions. Using the Spitzer Space Telescope, we obtained total three observations (P=0.813 days) at...
We report 78 secondary eclipse depths for a sample of 36 transiting hot Jupiters observed at 3.6- and 4.5 microns using the Spitzer Space Telescope. Our results 27 these planets are new, include highly irradiated worlds such as KELT-7b, WASP-87b, WASP-76b, WASP-64b, important targets JWST WASP-62b. find that WASP-62b has slightly eccentric orbit e cos(omega) = 0.00614+/- 0.00064, we confirm eccentricity HAT-P-13b WASP-14b. The remainder individually consistent with circular orbits, but...
We present transmission spectroscopy of the hot-Jupiter WASP-31b using FORS2 on VLT during two primary transits. The observations cover a wavelength range $\approx$400-840nm. light curves are corrupted by significant systematics, but these were to first order invariant with and could be removed common-mode correction derived from white curves. reach precision in transit depth $\approx$140 ppm 15 nm bins, although varies significantly over range. Our confirm cloud-deck previously inferred...
The temperature profile of a planetary atmosphere is key diagnostic radiative and dynamical processes governing the absorption, redistribution, emission energy. Observations have revealed dayside stratospheres that either cool or warm with altitude for small number gas giant exoplanets, while other are consistent constant temperatures. Here we report spectroscopic phase curve measurements WASP-121b, which constrain stratospheric temperatures throughout diurnal cycle. Variations measured...
We present the first exoplanet phase curve measurement made with JWST NIRSpec instrument, highlighting exceptional stability of this newly-commissioned observatory for climate studies. The target, WASP-121b, is an ultrahot Jupiter orbital period 30.6 hr. analyze two broadband light curves generated NRS1 and NRS2 detectors, covering wavelength ranges 2.70-3.72 micron 3.82-5.15 micron, respectively. Both exhibit minimal systematics, approximately linear drifts in baseline flux level 30 ppm/hr...