A5043179376- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Scientific Measurement and Uncertainty Evaluation
- Spectroscopy and Laser Applications
University of Washington
2023-2024
NASA Astrobiology Institute
2023-2024
Planetary Science Institute
2023
Universities Space Research Association
2020
Goddard Space Flight Center
2020
Columbia University
2018-2020
NASA Exoplanet Science Institute
2020
Seven rocky planets orbit the nearby dwarf star TRAPPIST-1, providing a unique opportunity to search for atmospheres on small outside Solar System (Gillon et al., 2017). Thanks recent launch of JWST, possible atmospheric constituents such as carbon dioxide (CO2) are now detectable (Morley 2017, Lincowski 2018}. Recent JWST observations innermost planet TRAPPIST-1 b showed that it is most probably bare rock without any CO2 in its atmosphere (Greene 2023). Here we report detection thermal...
Abstract We present the discovery and validation of a three-planet system orbiting nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). lies in TESS continuous viewing zone Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R ⊕ to 2.6 orbital periods 9.98 37.43 days. Ground-based follow-up combined diagnostic vetting tests enables us rule out common astrophysical false-positive scenarios validate planets. The outermost planet, d,...
Abstract The first James Webb Space Telescope observations of TRAPPIST-1 c showed a secondary eclipse depth 421 ± 94 ppm at 15 μ m, which is consistent with bare rock surface or thin, O 2 -dominated, low-CO atmosphere. Here we further explore potential atmospheres for by comparing the observed to synthetic spectra broader range plausible environments. To self-consistently incorporate impact photochemistry and atmospheric composition on thermal structure predicted depth, use two-column...
Abstract The search for water-rich Earth-sized exoplanets around low-mass stars is rapidly gaining attention because they represent the best opportunity to characterize habitable planets in near future. Understanding atmospheres of these and determining optimal strategy characterizing them through transmission spectroscopy with our upcoming instrumentation essential order constrain their environments. For this study, we present simulated spectra tidally locked ocean-covered late-M mid-K...
We report the discovery of TOI-700 e, a 0.95 R$_\oplus$ planet residing in Optimistic Habitable Zone (HZ) its host star. This was enabled by multiple years monitoring from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. The star, (TIC 150428135), is nearby (31.1 pc), inactive, M2.5 dwarf ($V_{mag} = 13.15$). already known to three planets, including small, HZ planet, d. new has an orbital period 27.8 days and, based on radius (0.95 R$_\oplus$), it likely rocky. observed for 21...
We present $Spitzer$ 4.5$\mu$m observations of the transit TOI-700 d, a habitable zone Earth-sized planet in multiplanet system transiting nearby M-dwarf star (TIC 150428135, 2MASS J06282325-6534456). d has radius $1.144^{+0.062}_{-0.061}R_\oplus$ and orbits within its host star's conservative with period 37.42 days ($T_\mathrm{eq} \sim 269$K). also hosts two small inner planets (R$_b$=$1.037^{+0.065}_{-0.064}R_\oplus$ & R$_c$=$2.65^{+0.16}_{-0.15}R_\oplus$) periods 9.98 16.05 days,...
We present self-consistent three-dimensional climate simulations of possible habitable states for the newly discovered Habitable Zone Earth-sized planet, TOI-700 d. explore a variety atmospheric compositions, pressures, and rotation both ocean-covered completely desiccated planets in order to assess planet's potential habitability. For all 20 our simulated cases, we use model outputs synthesize transmission spectra, combined-light integrated broadband phase curves. These...
The interior structure of an exoplanet is hidden from direct view yet likely plays a crucial role in influencing the habitability Earth analogues. Inferences are impeded by fundamental degeneracy that exists between any model comprising more than two layers and observations constraining just bulk parameters: mass radius. In this work, we show although inverse problem indeed degenerate, there boundary conditions enables one to infer minimum maximum core radius fraction, CRFmin CRFmax. These...
The first JWST observations of TRAPPIST-1 c showed a secondary eclipse depth 421+/-94 ppm at 15 um, which is consistent with bare rock surface or thin, O2-dominated, low CO2 atmosphere (Zieba et al. 2023). Here, we further explore potential atmospheres for by comparing the observed to synthetic spectra broader range plausible environments. To self-consistently incorporate impact photochemistry and atmospheric composition on thermal structure predicted depth, use two-column climate model...
The TRAPPIST-1 system provides an exquisite laboratory for understanding exoplanetary atmospheres and interiors. Their mutual gravitational interactions leads to transit timing variations, from which Grimm et al. (2018) recently measured the planetary masses with precisions ranging 5% 12%. Using these <5% radius measurements on each planet, we apply method described in Suissa infer minimum maximum CRF (core fraction) of planet. Further, modify limit account fact that a light volatile...
Seven rocky planets orbit the nearby dwarf star TRAPPIST-1, providing a unique opportunity to search for atmospheres on small outside Solar System. Thanks recent launch of James Webb Space Telescope (JWST), possible atmospheric constituents such as carbon dioxide (CO2) are now detectable. Recent JWST observations innermost planet TRAPPIST-1&#8201;b showed that it is most probably bare rock without any CO2 in its atmosphere. Here we report detection thermal emission from dayside...
<title>Abstract</title> The search for life in the Universe has a significant focus on M dwarf stars, as they are most common stellar type, and their small sizes low masses make it easier to detect characterize small, temperate planets. However, dwarfs, especially those with lowest masses, emit frequent flares long portions of lifetimes that may erode planetary atmospheres. Demographic studies have shown planets size Earth Habitable Zone — region where liquid water could likely exist...
We report the discovery of TOI-700 e, a 0.95 R$_\oplus$ planet residing in Optimistic Habitable Zone (HZ) its host star. This was enabled by multiple years monitoring from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. The star, (TIC 150428135), is nearby (31.1 pc), inactive, M2.5 dwarf ($V_{mag} = 13.15$). already known to three planets, including small, HZ planet, d. new has an orbital period 27.8 days and, based on radius (0.95 R$_\oplus$), it likely rocky. observed for 21...
The TRAPPIST-1 system provides an exquisite laboratory for understanding exoplanetary atmospheres and interiors. Their mutual gravitational interactions leads to transit timing variations, from which Grimm et al. (2018) recently measured the planetary masses with precisions ranging 5% 12%. Using these <5% radius measurements on each planet, we apply method described in Suissa infer minimum maximum CRF (core fraction) of planet. Further, modify limit account fact that a light volatile...
In the past decade, we've discovered over 4,000 exoplanets1, or faraway worlds orbiting other stars. However, we can't yet take a clear picture of any them, so how can begin to imagine what they look like?