A5077821531- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Space Science and Extraterrestrial Life
- Pulsars and Gravitational Waves Research
- Advanced Frequency and Time Standards
- Cardiac electrophysiology and arrhythmias
- Mosquito-borne diseases and control
- Radioactive Decay and Measurement Techniques
- Nonlinear Dynamics and Pattern Formation
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Space exploration and regulation
- Space Exploration and Technology
- Atrial Fibrillation Management and Outcomes
- Spacecraft and Cryogenic Technologies
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
College of New Jersey
2022-2024
Pennsylvania State University
2018-2023
Florida Institute of Technology
2016
We determine the orbital eccentricities of individual small Kepler planets, through a combination asteroseismology and transit light-curve analysis. are able to constrain 51 systems with single transiting planet, which supplement our previous measurements 66 planets in multi-planet systems. Through Bayesian hierarchical analysis, we find evidence that only one detected planet have different eccentricity distribution than multiple planets. The single-transiting is well described by positive...
The dwarf planet Haumea is one of the most compelling transneptunian objects (TNOs) to study, hosting two small, dynamically interacting satellites, a family nearby spectrally unique objects, and ring system. itself extremely oblate due its 3.9 hour rotation period. Understanding orbits Haumea's named Hi'iaka Namaka, requires detailed modeling both satellite-satellite gravitational interactions satellite with nonspherical field (parameterized here as $J_2$). these effects allows for probe...
ABSTRACT Kepler has discovered hundreds of systems with multiple transiting exoplanets which hold tremendous potential both individually and collectively for understanding the formation evolution planetary systems. Many these consist small planets periods less than ∼50 days known as Systems Tightly spaced Inner Planets, or STIPs. One especially intriguing STIP, Kepler-80 (KOI-500), contains five planets: f, d, e, b, c 1.0, 3.1, 4.6, 7.1, 9.5 days, respectively. We provide measurements...
Super-Earths and mini-Neptunes exhibit great diversity in their compositional orbital properties. Their bulk densities span a large range, from those dense enough to be purely rocky needing substantial contribution volatiles volumes. configurations range compact, circular multi-transiting systems like Kepler-11 our Solar System's terrestrial planets with wider spacings modest but significant eccentricities mutual inclinations. Here we investigate whether continuum of formation conditions...
The study of orbital resonances allows for the constraint planetary properties compact systems. K2-138 is an early K-type star with six planets, five which have been proposed to be in longest chain 3:2 mean motion resonances. To observe and potentially verify resonant behavior K2-138's we run N-body simulations using previously measured parameters. Through our analysis, find that 99.2% result a resonances, although only 11% them show five-planet resonance chain. We are able use constrain...
A question driving many studies is whether the thousands of exoplanets known today typically formed where we observe them or further out in disk and migrated in. Early discoveries giant orbiting near their host stars mean motion resonances were interpreted as evidence for migration its crucial role beginnings planetary systems. long-scale has been invoked to explain systems planets resonant chains consisting three more linked by integer period ratios. However, recent have reproduced specific...
ABSTRACT Approximately 8 per cent of the ∼2800 known pulsars exhibit ‘nulling,’ a temporary broad-band cessation normal pulsar emission. Nulling behaviour can be coarsely quantified by nulling fraction, which describes percentage time given will found in null state. In this paper, we perform most thorough statistical analysis thus far properties 141 pulsars. We find weak, non-linear correlations between fraction and pulse width, as well spin period could attributed to selection effects. also...
Since the launch of Kepler space telescope in 2009 and subsequent K2 mission, hundreds multi-planet systems have been discovered. The study such systems, both as individual a population, leads to better understanding planetary formation evolution. Kepler-80, K-dwarf hosting six super-Earths, was first system known four planets chain resonances, repeated geometric configuration. Transiting resonant chains can enable us estimate not only planets' orbits sizes but also their masses. original...
A growing avenue for determining the prevalence of life beyond Earth is to search "technosignatures" from extraterrestrial intelligences/agents. Technosignatures require significant energy be visible across interstellar space and thus intentional signals might concentrated in frequency, time, or space, found mutually obvious places. Therefore, it could advantageous technosignatures parts parameter that are mutually-derivable an observer on a distant transmitter. In this work, we used L-band...
The ''radius valley" is a relative dearth of planets between two potential populations exoplanets, super-Earths and mini-Neptunes. This feature appears in examining the distribution planetary radii, but has only ever been characterized on small samples. valley could be result photoevaporation, which predicted numerous theoretical models, or other processes. Here, we investigate relationship radius orbital period through 2-dimensional kernel density estimator various clustering methods, using...
Sixty-seven bleeding reactions occurred during anticoagulant therapy. In 14 patients, enzyme induction appeared to be a factor, and two of these patients died. The records were reviewed 52 who admitted for myocardial infarction treated with anticoagulants. Forty received barbiturates showed more erratic control effect (and shorter prothrombin time in spite larger dose warfarin sodium) than the group not receiving barbiturates. Barbiturate interference activity coumarin drugs by is well...
Although resonant planets have orbital periods near commensurability, resonance is also dictated by other factors, such as the planets' eccentricities and masses, therefore must be confirmed through a study of system's dynamics. Here, we perform for five multi-planet systems: Kepler-226, Kepler-254, Kepler-363, Kepler-1542, K2-32. For each system, run suite N-body simulations that span full parameter-space consistent with constrained planetary properties. We stability system look resonances...
The study of orbital resonances allows for the constraint planetary properties compact systems. We can predict a system's by observing periods planets, as planets in or near mean motion resonance have period ratios that reduce to ratio small numbers. However, commensurability does not guarantee resonance; we must dynamics and resonant angles confirm resonance. Because require in-depth confirm, because two-body measurement eccentricity vector which is quite challenging, very few pairs chains...
The search for life in the universe is a major theme of astronomy and astrophysics next decade. Searches technosignatures are complementary to searches biosignatures, that they offer an alternative path discovery, address question whether complex (i.e. technological) exists elsewhere Galaxy. This approach has been endorsed prior Decadal Reviews National Academies reports, yet field still receives almost no federal support US. Because this lack support, technosignatures, precisely part...
Exoplanet systems with multiple planets in mean motion resonances have often been hailed as a signpost of disk driven migration. Resonant chains like Kepler-223 and Kepler-80 consist trio the three-body resonant angle librating and/or two-body for each pair. Here we investigate whether close-in super-Earths mini-Neptunes forming situ can lock into due to dissipation from depleted gas disk. We simulate giant impact phase planet formation, including eccentricity damping gaseous disk, followed...
Although resonant planets have orbital periods near commensurability, resonance is also dictated by other factors, such as the planets' eccentricities and masses, therefore must be confirmed through a study of system's dynamics. Here, we perform for five multi-planet systems: Kepler-226, Kepler-254, Kepler-363, Kepler-1542, K2-32. For each system, run suite N-body simulations that span full parameter-space consistent with constrained planetary properties. We stability system look resonances...
The study of orbital resonances allows for the constraint planetary properties compact systems. We can predict a system's by observing periods planets, as planets in or near mean motion resonance have period ratios that reduce to ratio small numbers. However, commensurability does not guarantee resonance; we must dynamics and resonant angles confirm resonance. Because require in-depth confirm, because two-body measurement eccentricity vector which is quite challenging, very few pairs chains...