A5007980040- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Infrared Target Detection Methodologies
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Advanced Semiconductor Detectors and Materials
- History and Developments in Astronomy
- Astrophysics and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Cardiac Valve Diseases and Treatments
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Photocathodes and Microchannel Plates
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Gas Sensing Nanomaterials and Sensors
- Galaxies: Formation, Evolution, Phenomena
Space Telescope Science Institute
2012-2023
Johns Hopkins University
2014-2023
University Hospital Waterford
2021
Baylor University Medical Center
2017-2020
Baylor Jack and Jane Hamilton Heart and Vascular Hospital
2014-2020
Edwards Lifesciences (United States)
2019-2020
Vanderbilt University Medical Center
2020
San Diego Cardiac Center
2020
Mayo Clinic in Arizona
2018
University of Virginia
2017
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...
Exoplanetary transmission spectroscopy in the near-infrared using Hubble Space Telescope (HST) NICMOS is currently ambiguous because different observational groups claim results from same data, depending on their analysis methodologies. Spatial scanning with HST/WFC3 provides an opportunity to resolve this ambiguity. We here report WFC3 of giant planets HD 209458b and XO-1b transit, spatial mode for maximum photon-collecting efficiency. introduce technique that derives exoplanetary spectrum...
We have completed a robotic wide‐angle imaging survey of the southern sky (δ = +15° to −90°) at 656.3 nm wavelength, Hα emission line hydrogen. Each image resulting Southern Sky Survey Atlas (SHASSA) covers an area 13° square angular resolution approximately 08 and reaches sensitivity level 2 R (1.2 × 10-17 ergs cm−2 s−1 arcsec−2) pixel−1, corresponding measure 4 cm−6 pc brightness temperature for microwave free‐free 12 μK 30 GHz. Smoothing over several pixels allows features as faint 0.5 be...
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 $M_\mathrm{Jup}$...
The Transiting Exoplanet Survey Satellite (TESS) is a NASA-sponsored Explorer mission that will perform wide-field survey for planets transit bright host stars. Here, we predict the properties of transiting TESS detect along with eclipsing binary stars produce false-positive photometric signals. predictions are based on Monte Carlo simulations nearby population stars, occurrence rates derived from Kepler, and models performance sky coverage cameras. We expect find approximately 1700 200,000...
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...
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,...
Capitalizing on the observational advantage offered by its tiny M dwarf host, we present HST/WFC3 grism measurements of transmission spectrum super-Earth exoplanet GJ1214b. These are first published WFC3 observations a transiting atmosphere. After correcting for ramp-like instrumental systematic, achieve nearly photon-limited precision in these observations, finding GJ1214b to be flat between 1.1 and 1.7 microns. Inconsistent with cloud-free solar composition atmosphere at 8.2 sigma,...
Results from the Kepler mission indicate that occurrence rate of small planets ($<3$ $R_\oplus$) in habitable zone nearby low-mass stars may be as high 80%. Despite this abundance, probing conditions and atmospheric properties on any habitable-zone planet is extremely difficult has remained elusive to date. Here, we report detection water vapor likely presence liquid icy clouds atmosphere $2.6$ $R_\oplus$ K2-18b. The simultaneous mid-atmosphere K2-18b particularly intriguing because receives...
We present photometry of 13 transits XO-3b, a massive transiting planet on an eccentric orbit. Previous data led to two inconsistent estimates the planetary radius. Our strongly favor smaller radius, with increased precision: R_p = 1.217 +/- 0.073 R_Jup. A conflict remains between mean stellar density determined from light curve, and surface gravity shapes spectral lines. argue curve should take precedence, revise system parameters accordingly. The radius is about 1 sigma larger than...
We report near-infrared spectroscopy of the gas giant planet HD 189733b in transit. used Hubble Space Telescope Wide Field Camera 3 (HST WFC3) with its G141 grism covering 1.1 μm to 1.7 and spatially scanned image across detector at 2'' s−1. When smoothed 75 nm bins, local maxima transit depths 1.15 1.4 water vapor features are, respectively, 83 ± 53 ppm 200 47 greater than minimum 1.3 μm. compare WFC3 spectrum composite assembled by Pont et al., extending from 0.3 24 Although are compatible...
We report the discovery of a transiting, Rp = 4.347 ± 0.099R⊕, circumbinary planet (CBP) orbiting Kepler K+M eclipsing binary (EB) system KIC 12351927 (Kepler-413) every ∼66 days on an eccentric orbit with ap 0.355 0.002 AU, ep 0.118 0.002. The two stars, MA 0.820 0.015 M☉, RA 0.776 0.009 R☉ and MB 0.542 0.008 RB 0.484 0.024 R☉, respectively, revolve around each other 10.11615 0.00001 nearly circular (eEB 0.037 0.002) orbit. orbital plane EB is slightly inclined to line sight (iEB 8733 006),...
The XO project's first objective is to find hot Jupiters transiting bright stars (i.e., V<12) by precision differential photometry. Two cameras have been operating since 2003 September on the 10,000 foot Haleakala summit Maui. Each camera consists of a 200 mm f/1.8 lens coupled 1024 × pixel, thinned CCD operated drift‐scanning. In its year routine operation, has observed 6.6% sky within six 7° wide strips scanned from 0° +63° declination and centered at R.A. = 0, 4, 8, 12, 16, 20 hr....
We report on a V = 11.2 early K dwarf, XO-2 (GSC 03413-00005), that hosts Rp 0.98±0.010.03 RJ, Mp 0.57 ± 0.06 MJ transiting extrasolar planet, XO-2b, with an orbital period of 2.615857 0.000005 days. has high metallicity, [Fe/H ] 0.45 0.02, proper motion, μtot 157 mas yr−1, and common motion stellar companion 31'' separation. The two stars are nearly identical twins, very similar spectra apparent magnitudes. Due to the these dwarf have mass radius close solar, M⋆ 0.98 0.02 M☉ R⋆...
We report the discovery of a massive (Mpsini = 13.02 +/- 0.64 Mjup; total mass 13.25 Mjup), large (1.95 0.16 Rjup) planet in transiting, eccentric orbit (e 0.260 0.017) around 10th magnitude F5V star constellation Camelopardalis. designate XO-3b, and XO-3, also known as GSC 03727-01064. The orbital period XO-3b is 3.1915426 0.00014 days. XO-3 lacks trigonometric distance; we estimate its distance to be 260 23 pc. radius 2.13 0.21 Rsun, 1.41 0.08 Msun, vsini 18.54 0.17 km/s, metallicity...
We report here the first infrared spectrum of hot-Jupiter XO-1b. The observations were obtained with NICMOS instrument on board Hubble Space Telescope during a primary eclipse XO-1 system. Near photon-noise-limited spectroscopy between 1.2 and 1.8 μm allows us to determine main composition this hot-Jupiter's planetary atmosphere good precision. This is third for which spectroscopic data are available in near-IR. shows presence water vapor (H2O), methane (CH4), carbon dioxide (CO2), suggests...
Data from the newly-commissioned \textit{Transiting Exoplanet Survey Satellite} (TESS) has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet radius of $1.32\pm 0.02$ $R_\oplus$ and orbits star every 11 hours. Although existence atmosphere such strongly irradiated is questionable, bright enough ($I=11.9$, $K=9.1$) for this possibility to be investigated with transit occultation spectroscopy. star's brightness planet's short period will also facilitate...
Recent results from the Kepler mission indicate that super-Earths (planets with masses between 1–10 times of Earth) are most common kind planet around nearby Sun-like stars. These planets have no direct solar system analogue, and currently one least well-understood classes extrasolar planets. Many average densities consistent a broad range bulk compositions, including both water-dominated worlds rocky covered by thick hydrogen helium atmosphere. Measurements transmission spectra these offer...
Abstract We report the detection of a transiting planet around π Men (HD 39091), using data from Transiting Exoplanet Survey Satellite ( TESS ). The solar-type host star is unusually bright V = 5.7) and was already known to Jovian on highly eccentric, 5.7 yr orbit. newly discovered has size 2.04 ± 0.05 R ⊕ an orbital period 6.27 days. Radial-velocity High-Accuracy Planet Searcher Anglo-Australian Telescope/University College London Echelle Spectrograph archives also displays day periodicity,...
We report the discovery of a transiting, gas giant circumbinary planet orbiting eclipsing binary KIC 4862625 and describe our independent two transiting planets Kepler-47 (Orosz et al. 2012). simple semi-automated procedure for identifying individual transits in light curves present follow-up measurements systems. For system, 0.52+/-0.018 RJup radius revolves every ~138 days occults 1.47+/-0.08 MSun, 1.7 +/-0.06 RSun F8 IV primary star producing aperiodic variable durations commensurate with...
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...
A planet transits an 11th magnitude, G1V star in the constellation Corona Borealis. We designate XO-1b, and star, XO-1, also known as GSC 02041-01657. XO-1 lacks a trigonometric distance; we estimate it to be 200+-20 pc. Of ten stars currently host extrasolar transiting planets, is most similar Sun its physical characteristics: radius 1.0+-0.08 R_Sun, mass 1.0+-0.03 M_Sun, V sini < 3 km/s, metallicity [Fe/H] 0.015+-0.04. The orbital period of XO-1b 3.941534+-0.000027 days, one longer ones...