Jacob L. Bean
A5052217136- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Architecture and Computational Design
- Calibration and Measurement Techniques
- High-pressure geophysics and materials
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Astronomical and nuclear sciences
- Isotope Analysis in Ecology
- Planetary Science and Exploration
- History and Developments in Astronomy
- Advanced Fiber Laser Technologies
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Inertial Sensor and Navigation
- Advanced Frequency and Time Standards
University of Chicago
2015-2024
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
DePaul University
2017
Kitt Peak National Observatory
2017
University of California, Berkeley
2017
University of Toledo
2017
University of Göttingen
2007-2013
Center for Astrophysics Harvard & Smithsonian
2010-2011
The University of Texas at Austin
2003-2009
The Transiting Exoplanet Survey Satellite (TESS) will search for planets transiting bright and nearby stars. TESS has been selected by NASA launch in 2017 as an Astrophysics Explorer mission. spacecraft be placed into a highly elliptical 13.7-day orbit around the Earth. During its two-year mission, employ four wide-field optical CCD cameras to monitor at least 200,000 main-sequence dwarf stars with I = 4-13 temporary drops brightness caused planetary transits. Each star observed interval...
The Transiting Exoplanet Survey Satellite (TESS ) will search for planets transiting bright and nearby stars. TESS has been selected by NASA launch in 2017 as an Astrophysics Explorer mission. spacecraft be placed into a highly elliptical 13.7-day orbit around the Earth. During its two-year mission, employ four wide-field optical CCD cameras to monitor at least 200,000 main-sequence dwarf stars with I<sub>C</sub> (approximately less than) 13 temporary drops brightness caused planetary...
We describe the catalogs assembled and algorithms used to populate revised TESS Input Catalog (TIC), based on incorporation of Gaia second data release. also a ranking system for prioritizing stars 2-minute cadence observations, assemble Candidate Target List (CTL) using that ranking. The TIC is available Mikulski Archive Space Telescopes (MAST) server, an enhanced CTL through Filtergraph visualization portal at URL http://filtergraph.vanderbilt.edu/tess_ctl.
A key legacy of the recently launched TESS mission will be to provide astronomical community with many best transiting exoplanet targets for atmospheric characterization. However, time is essence take full advantage this opportunity. JWST, although delayed, still complete its nominal five year on a timeline that motivates rapid identification, confirmation, and mass measurement top characterization from TESS. Beyond future dedicated missions studies such as ARIEL require discovery...
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 $M_\mathrm{Jup}$...
We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: ℓ Car, ζ Gem, β Dor, W Sgr, X Y FF Aql, T Vul, RT Aur. obtain these results with astrometric data from Fine Guidance Sensor 1r, a white-light interferometer on the Hubble Space Telescope. find in milliarcseconds: 2.01 ± 0.20 mas; 2.78 0.18 3.14 0.16 2.28 3.00 2.13 0.29 2.81 1.90 0.23 Aur, 2.40 0.19 average σπ/π = 8%. Two stars (FF Aql Sgr) required inclusion of binary...
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...
Context. A new class of exoplanets has emerged: the ultra hot Jupiters, hottest close-in gas giants. The majority them have weaker-than-expected spectral features in 1.1−1.7 μ m bandpass probed by HST/WFC3 but stronger at longer wavelengths Spitzer . This led previous authors to puzzling conclusions about thermal structures and chemical abundances these planets. Aims. We investigate how dissociation, ionization, H − opacity, clouds shape properties Jupiters. Methods. use SPARC/MITgcm model...
We present 2,241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its two-year prime mission. list these in TESS Objects of Interest (TOI) Catalog, which includes both new planet found by and previously-known planets recovered observations. describe process used to identify TOIs investigate characteristics candidates, discuss some notable discoveries. The TOI Catalog an unprecedented number small around nearby bright stars, are...
This article summarizes a workshop held on March, 2014, the potential of James Webb Space Telescope (JWST) to revolutionize our knowledge physical properties exoplanets through transit observations. JWST's unique combination high sensitivity and broad wavelength coverage will enable accurate measurement transits with signal-to-noise ratio (S/N). Most importantly, JWST spectroscopy investigate planetary atmospheres determine atomic molecular compositions, probe vertical horizontal structure,...
Abstract We present one of the most precise emission spectra an exoplanet observed so far. combine five secondary eclipses hot Jupiter WASP-18b ( T day ∼ 2900 K) that we secured between 1.1 and 1.7 μ m with Wide Field Camera 3 instrument on board Hubble Space Telescope . Our extracted spectrum (S/N = 50, R 40) does not exhibit clearly identifiable molecular features but is poorly matched by a blackbody spectrum. complement this data previously published Spitzer /Infrared Array observations...
Detailed characterization of exoplanets has begun to yield measurements their atmospheric properties that constrain the planets' origins and evolution. For example, past observations dayside emission spectrum hot Jupiter WASP-12b indicated its atmosphere a high carbon-to-oxygen ratio (C/O > 1), suggesting it had different formation pathway than is commonly assumed for giant planets. Here we report precise near-infrared transmission based on six transit with Hubble Space Telescope/Wide Field...
During its two-year prime mission, the Transiting Exoplanet Survey Satellite (TESS) will perform a time-series photometric survey covering over 80% of sky. This comprises observations 26 24° × 96° sectors that are each monitored continuously for approximately 27 days. The main goal TESS is to find transiting planets around 200,000 pre-selected stars which fixed aperture photometry recorded every two minutes. However, also recording and delivering full-frame images (FFIs) detector at...
The Second Workshop on Extreme Precision Radial Velocities defined circa 2015 the state of art Doppler precision and identified critical path challenges for reaching 10 cm s−1 measurement precision. presentations discussion key issues instrumentation data analysis workshop recommendations achieving this bold are summarized here. Beginning with High Accuracy Velocity Planet Searcher spectrograph, technological advances radial velocity (RV) measurements have focused building extremely stable...
The nature of the vertical thermal structure hot Jupiter atmospheres is one key questions raised by characterization transiting exoplanets over last decade. There have been claims that many Jupiter's exhibit profiles with increasing temperature decreasing pressure in infrared photosphere leads to reversal molecular absorption bands into emission features (an inversion). However, these based on broadband photometry rather than unambiguous identification spectroscopy, and chemical species...
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking formation evolution exoplanetary systems. Access to an exoplanet's chemical inventory requires high-precision observations, often inferred from individual molecular detections with low-resolution space-based high-resolution ground-based facilities. Here we report medium-resolution (R$\sim$600) transmission spectrum atmosphere between 3-5 $\mu$m covering multiple absorption...
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...
Transmission spectroscopy provides insight into the atmospheric properties and consequently formation history, physics, chemistry of transiting exoplanets. However, obtaining precise inferences from transmission spectra requires simultaneously measuring strength shape multiple spectral absorption features a wide range chemical species. This has been challenging given precision wavelength coverage previous observatories. Here, we present spectrum Saturn-mass exoplanet WASP-39b obtained using...
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability. However, no unambiguous photochemical products have been detected in exoplanet to date. Recent observations from JWST Transiting Exoplanet Early Release Science Program found spectral absorption feature at 4.05 $\mu$m arising SO$_2$ atmosphere WASP-39b. WASP-39b 1.27-Jupiter-radii, Saturn-mass (0.28 M$_J$) gas giant orbiting Sun-like star with an equilibrium temperature...
Abstract Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining dominant chemical processes at work and, if equilibrium, revealing planet formation histories. Transmission spectroscopy (for example, refs. 1,2 ) provides necessary means by abundances of oxygen- carbon-bearing species; however, this requires broad wavelength coverage, moderate spectral resolution high precision, which, together, are not achievable with...
Abstract Close-in giant exoplanets with temperatures greater than 2,000 K (‘ultra-hot Jupiters’) have been the subject of extensive efforts to determine their atmospheric properties using thermal emission measurements from Hubble Space Telescope (HST) and Spitzer 1–3 . However, previous studies yielded inconsistent results because small sizes spectral features limited information content data resulted in high sensitivity varying assumptions made treatment instrument systematics retrieval...