N. Heidari
A5006890187- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Noncommutative and Quantum Gravity Theories
- Cosmology and Gravitation Theories
- Mesenchymal stem cell research
- Optical Polarization and Ellipsometry
- High-pressure geophysics and materials
- Quantum Electrodynamics and Casimir Effect
- Sirtuins and Resveratrol in Medicine
- Telomeres, Telomerase, and Senescence
- Concrete and Cement Materials Research
- Crystal Structures and Properties
- Genetics, Aging, and Longevity in Model Organisms
- Neutrino Physics Research
- Cholesterol and Lipid Metabolism
- Space Exploration and Technology
- Extracellular vesicles in disease
- Adaptive optics and wavefront sensing
- Child and Adolescent Psychosocial and Emotional Development
- Problem Solving Skills Development
Sorbonne Université
2023-2024
Centre National de la Recherche Scientifique
2021-2024
Institut d'Astrophysique de Paris
2023-2024
University of Brighton
2024
Aix-Marseille Université
2021-2024
Observatoire de la Côte d’Azur
2021-2024
Royal Veterinary College
2023
University of London
2023
Laboratoire d’Astrophysique de Marseille
2021-2023
Shahid Beheshti University
2021-2023
Oleuropein (OLEU) is the most prevalent phenolic component in olive varieties, and it has been considered for its powerful antioxidant properties therapeutic applications. OLEU anti-inflammatory performs this property by suppressing inflammatory cells' function reducing oxidative stress caused various factors. This study investigated ability of to polarize LPS-stimulated murine macrophage (MQ) cell RAW 264.7 into M1/M2 macrophages. As a first step, cytotoxicity effects were evaluated on...
ABSTRACT HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP b) and 3.343 0.039 c). While 20.77291 d period b was measured unambiguously, c showed only transits separated by 680-d gap in time series, leaving many possibilities for period. To solve this issue, CHEOPS performed targeted aliases attempt recover true planet c, successfully determined be 52.56349 d....
We report the discovery and characterization of a small planet, TOI-1408 c, on 2.2-day orbit located interior to previously known hot Jupiter, b ($P=4.42$ d, $M=1.86\pm0.02\,M_\mathrm{Jup}$, $R=2.4\pm0.5\,R_\mathrm{Jup}$) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both duration (TDVs) inner planet. TTV amplitude c is 15% planet's orbital period, marking largest relative measured date....
The accuracy of theoretical mass, radius and effective temperature values for M-dwarf stars is an active topic debate. Differences between observed have raised the possibility that current stellar structure evolution models are inaccurate towards low-mass end main sequence. To explore this issue we use CHEOPS satellite to obtain high-precision light curves eclipsing binaries with low mass companions. We these combined spectroscopic orbit solar-type companion measure star. Here present...
The stellar activity of M dwarfs is the main limitation for discovering and characterizing exoplanets orbiting them since it induces quasi-periodic RV variations. We aim to characterize magnetic field early, moderately active, dwarf Gl205 in optical nIR domains. obtained high-precision quasi-simultaneous spectra with SOPHIE spectrograph SPIRou spectropolarimeter between 2019 2022. computed RVs from both instruments Stokes V profiles. used ZDI map large-scale over time span observations....
This work explores both classical and quantum aspects of an axisymmetric black hole within a non-commutative gauge theory. The rotating solution is derived using modified Newman-Janis procedure. analysis begins with the horizon structure, ergospheres, angular velocity. thermodynamic properties are examined through surface gravity, focusing on Hawking temperature, entropy, heat capacity. In addition, remnant mass calculated. radiation treated as tunneling process for bosonic fermionic...
The radial velocity method is amongst the most robust and established means of detecting exoplanets. Yet, it has so far failed to detect circumbinary planets despite their relatively high occurrence rates. Here, we report velocimetric measurements Kepler-16A, obtained with SOPHIE spectrograph, at Observatoire de Haute-Provence's 193cm telescope, collected during BEBOP survey for planets. Our mark first detection a planet, independently determining mass Kepler-16~(AB)~b be $0.313 \pm...
Transiting planets with orbital periods longer than 40 d are extremely rare among the 5000+ discovered so far. The lack of discoveries this population poses a challenge to research into planetary demographics, formation, and evolution. Here, we present detection characterization HD 88986 b, potentially transiting sub-Neptune, possessing longest period known small (<4 R ⊕ ) precise mass measurement ( σ M /M > 25%). Additionally, identified presence massive companion in wider orbit...
ABSTRACT Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and predicted by theoretical structure models. This ‘radius inflation’ problem could an impact on both exoplanetary science. We present the final results our observation programme with CHaracterising ExOPlanet Satellite (CHEOPS) to obtain high-precision light curves eclipsing binaries companions (EBLMs). Combined spectroscopic orbits solar-type companions, we can derive masses, radii,...
In this paper, we investigate the influence of anti-symmetric tensor effects, which trigger Lorentz symmetry breaking, on charged spherically symmetric black holes. Initially, address an overview model, laying groundwork for deriving solutions to With this, analyze horizons, critical orbits, and geodesics. We compute quasinormal modes with a particular emphasis vectorial perturbations. addition, derive Hawking temperature perform calculation remnant mass. Additionally, estimate lifetime...
We report the discovery and characterization of two sub-Saturns from Transiting Exoplanet Survey Satellite (\textit{TESS}) using high-resolution spectroscopic observations MaHPS spectrograph at Wendelstein Observatory SOPHIE Haute-Provence Observatory. Combining photometry TESS, KeplerCam, LCOGT, MuSCAT2 with radial velocity measurements we measure precise radii masses for both planets. TOI-5108 b is a sub-Saturn radius $6.6 \pm 0.1$ $R_\oplus$ mass $32 5$ $M_\oplus$. TOI-5786 similar to...
We report the discovery and characterization of two sub-Saturns from Transiting Exoplanet Survey Satellite ( TESS ) using high- resolution spectroscopic observations MaHPS spectrograph at Wendelstein Observatory SOPHIE Haute-Provence Observatory. Combining photometry TESS, KeplerCam, LCOGT, MuSCAT2, along with radial velocity measurements SOPHIE, we measured precise radii masses for both planets. TOI-5108 b is a sub-Saturn, radius 6.6 ± 0.1 R ⊕ mass 32 5 M . TOI-5786 similar to Saturn, 8.54...
Abstract Eclipsing binaries are perfect laboratories to measure precise, accurate and model-independent stellar radii masses, so long as both components spectroscopically resolved. Resolving is difficult in high-contrast binaries, for instance, those composed of an FGK main-sequence star with M-type companion. In cases, the secondary can contribute &lt;1 % total flux optical wavelengths. This makes measuring dynamical masses challenging has typically only been attempted large-aperture...
We report the discovery of TOI-4127 b, a transiting, Jupiter-sized exoplanet on long-period ($P = 56.39879^{+0.00010}_{-0.00010}$ d), high-eccentricity orbit around late F-type dwarf star. This warm Jupiter was first detected and identified as promising candidate from search for single-transit signals in TESS Sector 20 data, later characterized planet following two subsequent transits (TESS Sectors 26 53) follow-up ground-based RV observations with NEID SOPHIE spectrographs. jointly fit...
Planetary systems around solar analogs inform us about how planets form and evolve in Solar System-like environments. We report the detection characterization of two planetary TOI-1736 TOI-2141 using TESS photometry data spectroscopic obtained with SOPHIE instrument on 1.93 m telescope at Observatoire de Haute-Provence (OHP). performed a detailed analysis these to obtain precise radial velocities (RV) physical properties their host stars. each transiting sub-Neptune radii $2.44\pm0.18$...
We present the discovery of two small planets transiting HD 93963A (TOI-1797), a G0\,V star (M$_*$=1.109\,$\pm$\,0.043\,M$_\odot$, R$_*$=1.043\,$\pm$\,0.009\,R$_\odot$) in visual binary system. combined TESS and CHEOPS space-borne photometry with data from MuSCAT 2, `Alopeke, PHARO, TRES, FIES, SOPHIE. validated spectroscopically confirmed outer planet 93963 Ac, sub-Neptune an orbital period P$_c \approx$ 3.65 d, reported as object interest (TOI) shortly after release Sector 22 data. Ac has...
We report the discovery and characterization of transiting extrasolar planet TOI-1710$\:$b. It was first identified as a promising candidate by Transiting Exoplanet Survey Satellite (TESS). Its planetary nature then established with SOPHIE HARPS-N spectroscopic observations via radial-velocity method. The stellar parameters for host star are derived from spectra joint Markov chain Monte-Carlo (MCMC) adjustment spectral energy distribution evolutionary tracks TOI-1710. A MCMC analysis TESS...
Eclipsing binaries are important benchmark objects to test and calibrate stellar structure evolution models. This is especially true for with a fully convective M-dwarf component which direct measurements of these stars' masses radii difficult using other techniques. Within the potential M-dwarfs be exoplanet host stars, accuracy theoretical predictions their radius effective temperature as function mass an active topic discussion. Not only parameters transiting exoplanets but also success...
We report the characterization of two planet candidates detected by Transiting Exoplanet Survey Satellite (TESS), TOI-1199 b and TOI-1273 b, with periods 3.7 4.6 days, respectively. Follow-up observations for both targets, which include several ground-based light curves, confirmed transit events. High-precision radial velocities from SOPHIE spectrograph revealed signals at expected frequencies phases transiting allowed mass determinations a precision $8.4\%$ $6.7\%$ The planetary orbital...
We report on the discovery and validation of a transiting long-period mini-Neptune orbiting bright (V = 9.0 mag) G dwarf (TOI 4633; R 1.05 RSun, M 1.10 MSun). The planet was identified in data from Transiting Exoplanet Survey Satellite by citizen scientists taking part Planet Hunters TESS project. Modeling transit events yields an orbital period 271.9445 +/- 0.0040 days radius 3.2 0.20 REarth. Earth-like incident flux 1.56 0.2 places it optimistic habitable zone around star. Doppler...
We present the discovery and characterization of a transiting sub-Neptune orbiting with 16.20 day period around nearby (28 pc) bright(V=8.37) K0V star HD207897 (TOI-1611). This is based on photometric measurements from Transiting Exoplanet Survey Satellite(TESS) mission radial velocity (RV) observations SOPHIE, Automated Planet Finder (APF) HIRES high precision spectrographs. used EXOFASTv2 for simultaneously modeling parameters planet its host star, combining RV data to determine planetary...
Abstract Large-scale exoplanet surveys like the Transiting Exoplanet Survey Satellite (TESS) mission are powerful tools for discovering large numbers of candidates. Single-transit events commonplace within resulting candidate list due to unavoidable limitation observing baseline. These single-transit planets often remain unverified their unknown orbital periods and consequent difficulty in scheduling follow-up observations. In some cases, radial velocity (RV) follow up can constrain period...
ABSTRACT Ongoing ground-based radial-velocity observations seeking to detect circumbinary planets focus on single-lined binaries even though over 9 in every 10 binary systems the solar neighbourhood are double lined. Double-lined average brighter, and should principle yield more precise radial velocities. However, as two stars orbit one another, they produce a time-varying blending of their weak spectral lines. This makes an accurate measure velocities difficult, producing typical scatter...