John Berberian
A5001271284- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Synthesis and properties of polymers
- Methane Hydrates and Related Phenomena
- Calibration and Measurement Techniques
- Ionic liquids properties and applications
- Fetal and Pediatric Neurological Disorders
- Solid-state spectroscopy and crystallography
- Astronomical Observations and Instrumentation
- Vestibular and auditory disorders
- Scientific Research and Discoveries
- Hearing, Cochlea, Tinnitus, Genetics
George Mason University
2020-2022
University of California San Diego Medical Center
2006
Rady Children's Hospital-San Diego
2006
Saint Joseph's University
1992
We present high resolution near-infrared spectropolarimetric observations using the SPIRou instrument at CFHT during a transit of recently detected young planet AU Mic b, with supporting spectroscopic data from iSHELL IRTF. detect Zeeman signatures in Stokes V profiles, and measure mean longitudinal magnetic field $\overline{B}_\ell=46.3\pm0.7$~G. Rotationally modulated spots likely cause long-term variations slope $d{B_\ell}/dt=-108.7\pm7.7$~G/d. apply cross-correlation technique to line...
Abstract Astronomers do not have a complete picture of the effects wide-binary companions (semimajor axes greater than 100 au) on formation and evolution exoplanets. We investigate these using new data from Gaia Early Data Release 3 Transiting Exoplanet Survey Satellite mission to characterize systems with transiting identify sample 67 exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. derive limits parameters for measure...
We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m b 30.8 ± 1.5 M ⊕ , R 4.7 0.3 ) located in “hot Neptune desert”. Confirmation TESS Object Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well from photometric data TESS, Spitzer ground-based photometry MuSCAT2, TRAPPIST-South, MONET-South, George Mason University telescope, Las Cumbres Observatory Global Telescope network, El Sauce TÜBİTAK...
We present the bright (V$_{mag} = 9.12$), multi-planet system TOI-431, characterised with photometry and radial velocities. estimate stellar rotation period to be $30.5 \pm 0.7$ days using archival TOI-431b is a super-Earth of 0.49 days, radius 1.28 $\pm$ 0.04 R$_{\oplus}$, mass $3.07 0.35$ M$_{\oplus}$, density $8.0 1.0$ g cm$^{-3}$; TOI-431d sub-Neptune 12.46 $3.29 0.09$ $9.90^{+1.53}_{-1.49}$ $1.36 0.25$ cm$^{-3}$. find third planet, TOI-431c, in HARPS velocity data, but it not seen...
Abstract We validate the presence of a two-planet system orbiting 0.15–1.4 Gyr K4 dwarf TOI 560 (HD 73583). The consists an inner moderately eccentric transiting mini-Neptune (TOI b, <?CDATA $P={6.3980661}_{-0.0000097}^{+0.0000095}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>P</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>6.3980661</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.0000097</mml:mn> <mml:mo>+</mml:mo>...
Abstract We present the validation of a transiting low-density exoplanet orbiting M2.5 dwarf TOI 620 discovered by NASA Transiting Exoplanet Survey Satellite (TESS) mission. utilize photometric data from both TESS and ground-based follow-up observations to validate ephemerides 5.09 day signal vet false-positive scenarios. High-contrast imaging are used resolve stellar host exclude companions at separations ≳0.″2. obtain spectroscopy corresponding precise radial velocities (RVs) with multiple...
We present a unique implementation of Python coding in an asynchronous object-oriented programming (OOP) framework to fully automate the process collecting data with George Mason University (GMU) Observatory's 0.8-meter telescope. The goal this project is perform automated follow-up observations for Transiting Exoplanet Survey Satellite (TESS) mission, while still allowing human control, monitoring, and adjustments. Prior our implementation, facility was computer-controlled by observer...
We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m_b 30.8 +/- 1.5 M_earth , R_b 4.7 0.3 R_earth ) located in 'hot Neptune desert'. Confirmation TESS Object Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well from photometric data TESS, Spitzer, ground-based photometry MuSCAT2, TRAPPIST- South, MONET-South, George Mason University telescope, Las Cumbres Observatory Global Telescope network, El...
First Page
The Habitable Worlds Observatory will attempt to image Earth-sized planets in Zone orbits around nearby Sun-like stars. In this work we explore approximate analytic yield calculations for a future flagship direct imaging mission survey sample of uniformly distributed set identical We consider the dependence exoplanet detection on factors such as eta_Earth, telescope diameter, total on-sky time, orbital phase and separation, inner working angle, flux contrast, desired signal-to-noise ratio,...
We validate the presence of a two-planet system orbiting 0.15--1.4 Gyr K4 dwarf TOI 560 (HD 73583). The consists an inner moderately eccentric transiting mini-Neptune (TOI b, $P = 6.3980661^{+0.0000095}_{-0.0000097}$ days, $e=0.294^{+0.13}_{-0.062}$, $M= 0.94^{+0.31}_{-0.23}M_{Nep}$) initially discovered in Sector 8 \tess\ mission observations, and c, 18.8805^{+0.0024}_{-0.0011}$ 1.32^{+0.29}_{-0.32}M_{Nep}$) 34 rare near-1:3 orbital resonance. utilize photometric data from \tess\,...