A5088719363- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Crystal Structures and Properties
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Astronomical and nuclear sciences
- Spectroscopy and Laser Applications
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
University of Chicago
2023-2024
Abstract We present the transmission spectrum of original transiting hot Jupiter HD 209458b from 2.3 to 5.1 μ m as observed with NIRCam instrument on James Webb Space Telescope (JWST). Previous studies 209458b’s atmosphere have given conflicting results abundance H 2 O and presence carbon- nitrogen-bearing species, which significant ramifications inferences planet’s metallicity (M/H) carbon-to-oxygen (C/O) ratio. detect strong features CO in JWST spectrum, when interpreted using a retrieval...
Abstract We present the dayside thermal emission spectrum of WASP-77Ab from 2.8 to 5.2 μ m as observed with NIRSpec instrument on James Webb Space Telescope (JWST). was previously found have a subsolar metallicity and solar carbon-to-oxygen (C/O) ratio H 2 O CO absorption lines detected using high-resolution spectroscopy. By performing atmospheric retrievals JWST assuming chemical equilibrium, we find [M/H] = <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Abstract A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence on M-Earths highly uncertain because their host stars’ extended history high X-ray ultraviolet irradiation may act completely remove atmospheres. We present two secondary eclipse observations M-Earth Gl 486b (also known as GJ 486b) between 5 12 μ m. combined these with a precise analysis star parameters derive planetary dayside temperature...
Abstract We present thermal emission measurements of GJ 1132b spanning 5–12 μ m obtained with the Mid-Infrared Instrument Low-Resolution Spectrometer on James Webb Space Telescope. is an M dwarf rocky planet T eq = 584 K and orbital period 1.6 days. measure a white-light secondary eclipse depth 140 ± 17 ppm, which corresponds to dayside brightness temperature p ,dayside 709 31 using improved star parameters. This measured only 1 σ below maximum possible bare rock (i.e., assuming zero-albedo...
Calibrating the optical properties within detection medium of a neutrino telescope is crucial for determining its angular resolution and energy scale. For next generation telescopes planned to be constructed in deep water, such as TRopIcal DEep-sea Neutrino Telescope (TRIDENT), there are additional challenges due dynamic nature potential non-uniformity water medium. This necessitates real-time calibration system distributed throughout large detector array. study introduces custom-designed...
A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence on M-Earths highly uncertain because their host stars' extended history high XUV irradiation may act completely remove atmospheres. We present two secondary eclipse observations M-Earth Gl 486b (also known as GJ 486b) between 5-12 $\mu$m. combined these with a precise analysis star parameters derive planetary dayside temperature $T_{p}=865 \pm 14$...
The nearby transiting rocky exoplanet LTT 1445A b presents an ideal target for studying atmospheric retention in terrestrial planets orbiting M dwarfs. It is cooler than many exoplanets yet tested atmospheres, receiving a bolometric instellation similar to Mercury's. Previous transmission spectroscopy ruled out light H/He-dominated atmosphere but could not distinguish between bare-rock, high-MMW, or cloudy atmosphere. We present new secondary eclipse observations using JWST's MIRI/LRS,...
We report JWST NIRSpec/G395H observations of TOI-1685 b, a hot rocky super-Earth orbiting an M2.5V star, during full orbit. obtain transmission and emission spectra the planet characterize properties phase curve, including its amplitude offset. The spectrum rules out clear H$_2$-dominated atmospheres, while secondary atmospheres (made water, methane, or carbon dioxide) cannot be statistically distinguished from flat line. is featureless consistent with blackbody-like brightness temperature,...
Determining which rocky exoplanets have atmospheres, and why, is a key goal for JWST. So far, emission observations of individual orbiting M stars (M-Earths) not provided definitive evidence atmospheres. Here, we synthesize data M-Earths find trend in measured brightness temperature (ratioed to its theoretical maximum value) as function instellation. However, the statistical this dependent on choice stellar model consider identification tentative. We show that can be explained by either...
We present the transmission spectrum of original transiting hot Jupiter HD\,209458b from 2.3 -- 5.1 $\mu$m as observed with NIRCam instrument on James Webb Space Telescope (JWST). Previous studies HD 209458b's atmosphere have given conflicting results abundance H$_2$O and presence carbon- nitrogen-bearing species, which significant ramifications inferences planet's metallicity (M/H) carbon-to-oxygen (C/O) ratio. detect strong features CO$_2$ in JWST spectrum, when interpreted using a...