A5054806694- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Advanced X-ray and CT Imaging
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Medical Imaging Techniques and Applications
- High-pressure geophysics and materials
- Infrared Target Detection Methodologies
- Radiation Detection and Scintillator Technologies
- Planetary Science and Exploration
Massachusetts Institute of Technology
2016-2025
Kavli Institute for Particle Astrophysics and Cosmology
2010-2024
Nicolaus Copernicus University
2024
Moscow Institute of Thermal Technology
2023
Vassar College
2010-2022
IIT@MIT
1987-2022
Kavli Energy NanoScience Institute
2016
Center for Scientific Review
2005
HRL Laboratories (United States)
2005
MIT Lincoln Laboratory
1990
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 XIS is an X-ray Imaging Spectrometer system, consisting of state-of-the-art charge-coupled devices (CCDs) optimized for detection, camera bodies, and control electronics. Four sets sensors are placed at the focal planes grazing-incidence, nested thin-foil mirrors (XRT: X-Ray Telescope) onboard Suzaku satellite. Three have front-illuminated CCDs, while other has a back-illuminated CCD. Coupled with XRT, energy range 0.2–12 keV resolution 130 eV 5.9 keV, field view $18^\prime \times...
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.
The ACIS instrument has been operating for three years in orbit, producing high quality scientific data on a wide variety of X-ray emitting astronomical objects. Except brief period at the very beginning mission when CCDs were exposed to radiation environment Outer van Allen Belts which resulted substantial damage front illuminated CCDs, operated nearly flawlessly. following report presents description instrument, current status calibration and few highlights results obtained from Guaranteed...
We report the results of first-epoch observation with ACIS-I instrument on Chandra X-Ray Observatory Sagittarius A* (Sgr A*), compact radio source associated supermassive black hole (SMBH) at dynamical center Milky Way. This produced first X-ray (0.5-7 keV) spectroscopic image arcsecond resolution central 17′ × (40 pc 40 pc) Galaxy. discovery an source, CXOGC J174540.0-290027, coincident Sgr within 0.″27 ± 0.″18. The probability a false match is estimated to be ≲0.5%. spectrum well fitted...
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...
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,...
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...
Abstract We perform a study of stellar flares for the 24,809 stars observed with 2 minute cadence during first two months TESS mission. Flares may erode exoplanets’ atmospheres and impact their habitability, but might also trigger genesis life around small stars. provides new sample bright dwarf in our galactic neighborhood, collecting data thousands M dwarfs that host habitable exoplanets. Here, we use an automated search accompanied by visual inspection. Then, public allesfitter code...
Abstract The Transiting Exoplanet Survey Satellite (TESS) is the first high-precision full-sky photometric survey in space. We extracted light curves from a magnitude limited set of stars and other stationary luminous objects TESS Full Frame Images using MIT Quick Look Pipeline. Here, we describe techniques used to create curves.
In this paper we present a catalog of 4584 eclipsing binaries observed during the first two years (26 sectors) TESS survey. We discuss selection criteria for binary candidates, detection hither-to unknown systems, determination ephemerides, validation and triage process, derivation heuristic estimates ephemerides. Instead keeping to widely used discrete classes, propose star morphology classification based on dimensionality reduction algorithm. Finally, statistical properties sample,...
We use Keck/NIRSPEC to survey a sample of young ($<$1 Gyr), short period mini Neptunes orbiting nearby K dwargs measure their mass loss via the metastable helium line. detect absorption from all four targets in our initial sample. The first detection, around TOI 560b, was announced previous paper. now announce three additional detections 1430.01, 2076b, and 1683.01. All planets show an average in-transit excess 0.7--1.0%. However, outflows differ kinematic properties. 1430b exhibits...
Doppler and transit surveys are finding extrasolar planets of ever smaller mass radius, now sampling the domain super Earths (1–3R⊕). Recent results from suggest that discovery a transiting Earth in habitable zone lower main sequence star may be possible. We evaluate prospects for an all-sky survey targeted to brightest stars, would find most favorable cases photometric spectroscopic characterization using James Webb Space Telescope (JWST). use proposed Transiting Exoplanet Survey Satellite...
We describe and discuss the global properties of 45 gamma-ray bursts (GRBs) observed by HETE-2 during first 3 years its mission, focusing on X-ray flashes (XRFs) X-ray-rich GRBs (XRRs). find that numbers XRFs, XRRs, are comparable, durations sky distributions XRFs XRRs similar to those GRBs. also spectral GRBs, except values peak energy E burst spectrum in νFν, flux Fpeak, fluence SE much smaller (and smaller) than Finally, we all three kinds form a continuum [SE(2-30 keV), SE(30-400) keV]...
We examine the spectrum of diffuse emission detected in 17' × field around Sgr A* during 625 ks Chandra observations. The exhibits He-like and H-like lines from Si, S, Ar, Ca, Fe that are consistent with an origin a two-temperature plasma, as well prominent low-ionization Kα line. cooler, kT ≈ 0.8 keV plasma differs surface brightness across image range (0.2-1.8) 10-13 ergs cm-2 s-1 arcmin-2 (observed, 2-8 keV). This soft is probably heated by supernovae, along small contribution winds...
We present a catalog of 2357 point sources detected during 590 ks Chandra observations the 17' × field around Sgr A*. This encompasses physical area 40 pc at distance 8 kpc. The completeness limit sample Galactic center is 1031 ergs s-1 (2.0-8.0 keV), while detection an order magnitude lower. 281 below 1.5 keV are mainly in foreground center, comparisons to deep fields high latitudes suggest that only about 100 observed background AGNs. surface density absorbed (not keV) falls off as 1/θ...
Energetic flares are observed in the Galactic supermassive black hole Sagittarius A* from radio to X-ray wavelengths. On a few occasions, simultaneous have been detected IR and observations, but clear counterparts at longer wavelengths not seen. We present flare over several hours on 2006 July 17 with Chandra X-Ray Observatory, Keck II telescope, Caltech Submillimeter Array. All telescopes strong events, submillimeter peak is found occur nearly 100 minutes after peak. polarization data show...
Context.We report new simultaneous near-infrared/sub-millimeter/X-ray observations of the Sgr A* counterpart associated with massive black hole at Galactic Center.
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...
ABSTRACT New insights on stellar evolution and interior physics are being made possible by asteroseismology. Throughout the course of Kepler mission, asteroseismology has also played an important role in characterization exoplanet-host stars their planetary systems. The upcoming NASA Transiting Exoplanet Survey Satellite ( TESS ) will be performing a near all-sky survey for planets that transit bright nearby stars. In addition, its excellent photometric precision, combined with fine time...
We report the detection of a transiting Earth-size planet around GJ 357, nearby M2.5 V star, using data from Transiting Exoplanet Survey Satellite (TESS). 357 b (TOI-562.01) is transiting, hot, Earth-sized ( T eq = 525 ± 11 K) with radius R 1.217 0.084 ⊕ and an orbital period P 3.93 d. Precise stellar radial velocities CARMENES PFS, as well archival HIRES, UVES, HARPS also display 3.93-day periodicity, confirming planetary nature leading to mass M 1.84 0.31 . In addition velocity signal for...
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,...