Diana Dragomir
A5031964650- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Spacecraft and Cryogenic Technologies
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Astronomical and nuclear sciences
- Astrophysical Phenomena and Observations
- Space Science and Extraterrestrial Life
- High-pressure geophysics and materials
- Inertial Sensor and Navigation
- Planetary Science and Exploration
- Ionosphere and magnetosphere dynamics
- Technology Assessment and Management
- Pulsars and Gravitational Waves Research
- Spacecraft Design and Technology
University of New Mexico
2019-2024
Massachusetts Institute of Technology
2016-2023
Kavli Institute for Particle Astrophysics and Cosmology
2019-2020
Moscow Institute of Thermal Technology
2019
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Las Cumbres Observatory Global Telescope Network
2012-2016
University of Chicago
2015-2016
University of California, Santa Barbara
2013-2015
University of British Columbia
2009-2012
Las Cumbres Observatory Global Telescope (LCOGT) is a young organization dedicated to time-domain observations at optical and (potentially) near-IR wavelengths. To this end, LCOGT constructing worldwide network of telescopes, including the two 2 m Faulkes as many 17 × 1 23 40 cm telescopes. These telescopes initially will be outfitted for imaging (excepting telescopes) spectroscopy wavelengths between atmospheric UV cutoff roughly 1-μm limit silicon detectors. Since first LCOGT's are now...
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...
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...
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 have detected transits of the innermost planet "e" orbiting 55 Cnc (V=6.0), based on two weeks nearly continuous photometric monitoring with MOST space telescope. The occur period (0.74 d) and phase that had been predicted by Dawson & Fabrycky, expected duration depth for crossing a Sun-like star hot super-Earth. Assuming star's mass radius to be 0.963_{-0.029}^{+0.051} M_sun 0.943 +/- 0.010 R_sun, planet's mass, radius, mean density are 8.63 0.35 Mearth, 2.00 0.14 Rearth,...
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...
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,...
The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and origins life by revealing atmospheric compositions, structures, dynamics transiting exoplanets in unprecedented detail. However, high-precision, timeseries observations required for such investigations have unique technical challenges, prior experience with Hubble, Spitzer, other facilities indicates that there will be a steep learning curve when JWST becomes operational. In this...
The James Webb Space Telescope (JWST) will likely revolutionize transiting exoplanet atmospheric science, due to a combination of its capability for continuous, long duration observations and larger collecting area, spectral coverage, resolution compared existing space-based facilities. However, it is unclear precisely how well JWST perform which myriad instruments observing modes be best suited studies. In this article, we describe prefatory Early Release Science (ERS) Cycle 1 program that...
Abstract The helium absorption triplet at a wavelength of 10833 Å has been proposed as way to probe the escaping atmospheres exoplanets. Recently this feature was detected for first time using Hubble Space Telescope ( HST ) WFC3 observations hot Jupiter WASP-107b. We use similar /WFC3 detect in atmosphere Neptune HAT-P-11b 4 σ confidence level. compare our grid 1D models hydrodynamic escape constrain thermospheric temperatures and mass loss rate. find that data are best fit by with high...
Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, structures are shaped by environment. Young planets ($<$1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where fastest. However, most known young orbit prohibitively faint stars. We present discovery two transiting HD 63433 (TOI 1726, TIC 130181866), a Sun-like ($M_*=0.99\pm0.03$) star. Through kinematics, lithium abundance, rotation, we confirm that is member Ursa...
Abstract The future of exoplanet science is bright, as Transiting Exoplanet Survey Satellite ( TESS ) once again demonstrates with the discovery its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in 36 day orbit around bright V = 8.1) nearby (16 pc) K4.5 dwarf. measures be R ⊕ , and combined archival follow-up precision radial velocity data put mass at M . contributes Level 1 Science Requirement providing 50 transiting planets smaller than 4...
We report the discovery and characterisation of a pair sub-Neptunes transiting bright K-dwarf TOI-1064 (TIC 79748331), initially detected in TESS photometry. To characterise system, we performed retrieved CHEOPS, TESS, ground-based photometry, HARPS high-resolution spectroscopy, Gemini speckle imaging. host star determine $T_{\rm eff, \star}=4734\pm67$ K, $R_{\star}=0.726\pm0.007$ $R_{\odot}$, $M_{\star}=0.748\pm0.032$ $M_{\odot}$. present novel detrending method based on PSF shape-change...
The increasing numbers of rocky, terrestrial exoplanets known to orbit nearby stars (especially M dwarfs) has drawn increased attention the possibility studying these planets' surface properties, and atmospheric compositions & escape histories. Here we report detection secondary eclipse exoplanet GJ1252b using Spitzer Space Telescope's IRAC2 4.5 micron channel. We measure an depth 149(+25/-32) ppm, corresponding a day-side brightness temperature 1410(+91/-125) K consistent with prediction...
We present the discovery and characterisation of two transiting planets observed by \textit{TESS} in light curves young bright (V=9.67) star HD73583 (TOI-560). perform an intensive spectroscopic photometric space- ground-based follow-up order to confirm characterise system. found that is a ($\sim 500$~Myr) active with rotational period $12.08 \pm 0.11 $\,d, mass radius $ 0.73 0.02 M_\odot$ $0.65 R_\odot$, respectively. b ($P_b=6.3980420 _{ - 0.0000062 }^{+0.0000067}$ d) has $10.2...
Abstract Over the last decade, precise exoplanet transmission spectroscopy has revealed atmospheres of dozens exoplanets, driven largely by observatories like Hubble Space Telescope. One major discovery been ubiquity atmospheric aerosols, often blocking access to chemical inventories. Tentative trends have identified, showing that clarity planetary may depend on equilibrium temperature. Previous work grouped dissimilar planets together in order increase statistical power any trends, but it...
Abstract JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates still unconfirmed and many the best planets for atmospheric characterization may remain be identified. We present a sample TESS that we identify as “best-in-class” transmission emission spectroscopy with JWST. These targets sorted into bins across equilibrium...
It is important to explore the diversity of characteristics low-mass, low-density planets understand nature and evolution this class planets. We present a homogeneous analysis 12 new 9 previously published broadband photometric observations Uranus-sized extrasolar planet GJ 3470b, which belongs growing sample sub-Jovian bodies orbiting M dwarfs. The consistency our explains some discrepancies between results provides updated constraints on planetary parameters. Our data are also consistent...
We present an IDL graphical user interface-driven software package designed for the analysis of extrasolar planet transit light curves. The Transit Analysis Package (TAP) uses Markov Chain Monte Carlo (MCMC) techniques to fit curves using analytic model Mandel and Agol (2002). incorporates a wavelet based likelihood function developed by Carter Winn (2009) which allows MCMC assess parameter uncertainties more robustly than classic chi-squared methods parameterizing uncorrelated "white"...