A5039135897- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Calibration and Measurement Techniques
- Optical Polarization and Ellipsometry
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Space Exploration and Technology
- Inertial Sensor and Navigation
- Particle physics theoretical and experimental studies
- Spectroscopy and Laser Applications
- Molecular spectroscopy and chirality
- Natural Language Processing Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Handwritten Text Recognition Techniques
- Hydrocarbon exploration and reservoir analysis
- Geomagnetism and Paleomagnetism Studies
- Dark Matter and Cosmic Phenomena
- Astronomical and nuclear sciences
- Geophysical and Geoelectrical Methods
Centre National de la Recherche Scientifique
2018-2024
Institut d'Astrophysique de Paris
2018-2024
University of Exeter
2023-2024
Sorbonne Université
2019-2024
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 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...
Brown-dwarfs are substellar objects with masses intermediate between planets and stars within about 13-80Mjup. While isolated BDs most likely produced by gravitational collapse in molecular clouds down to of a few Mjup, non-negligible fraction low-mass companions might be formed through the planet formation channel protoplanetary disks. The upper mass limit disks is still observationally unknown, main reason being strong dearth BD at orbital periods shorter than 10 years, a.k.a. desert. To...
We present the discovery of two new hot Jupiters identified from WASP survey, WASP-186b and WASP-187b (TOI-1494.01 TOI-1493.01). Their planetary nature was established SOPHIE spectroscopic observations, additional photometry obtained TESS. Stellar parameters for host stars are derived spectral line, IRFM, isochrone placement analyses. These combined with photometric radial velocity data in an MCMC method to determine properties. is a massive Jupiter (4.22 +/- 0.18 M_J, 1.11 +/-0.03 R_J)...
Context: The search for extrasolar planets around the nearest M dwarfs is a crucial step towards identifying Earth-like planets. One of main challenges in this that can be magnetically active and stellar activity produce radial velocity (RV) signals could mimic those planet. Aims: We aim to investigate whether 2.2 day period observed optical RVs nearby dwarf star Gl 388 (AD Leo) due or planet corotates with as suggested past. Methods: obtained quasi-simultaneous from 2019 2021 SOPHIE (R~75k)...
We present the obliquity measurement, that is, angle between normal of orbital plane and stellar spin axis, sub-Neptune planet HD3167 c, which transits a bright nearby K0 star. study architecture this multi-planet system to understand its dynamical history. also place constraints on d based geometry planetary system. New observations obtained with HARPS-N at Telescopio Nazionale Galileo (TNG) were employed for our analysis. The sky-projected was measured using three different methods:...
Since 2011, the SOPHIE spectrograph has been used to search for Neptunes and super-Earths in Northern Hemisphere. As part of this observational program, 290 radial velocity measurements 6.4 V magnitude star HD 158259 were obtained. Additionally, TESS photometric target are available. We present an analysis data compare our results with output pipeline. The data, ancillary spectroscopic indices, ground-based analyzed classical $\ell_1$ periodograms. stellar activity was modeled as a...
Mass is one of the most important parameters for determining true nature an astronomical object. Yet, many published exoplanets lack a measurement their mass, in particular those detected thanks to radial velocity (RV) variations host star. For those, only minimum or $m\sin i$, known, owing insensitivity RVs inclination orbit compared plane-of-the-sky. The mass that given database generally assumed edge-on system ($\sim$90$^\circ$), but other inclinations are possible, even extreme values...
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....
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 Using images from the Helioseismic and Magnetic Imager aboard Solar Dynamics Observatory, we extract radial velocity (RV) signal arising suppression of convective blueshift bright faculae dark sunspots transiting rotating solar disc. We remove these rotationally modulated magnetic-activity contributions simultaneous RVs observed by HARPS-N (High Accuracy Radial Planet Searcher for Northern hemisphere) feed to produce an RV time series magnetically quiet surface (the ‘inactive-region...
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...
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 report the detection of two exoplanets and a further tentative candidate around M-dwarf stars Gl96 Gl617A, based on radial velocity measurements obtained with SOPHIE spectrograph at Observatoire de Haute-Provence. Both were observed in context exoplanet consortium's dedicated subprogramme, which aims to detect nearby through systematic survey. For Gl96, we present discovery new 73.9 d minimum mass 19.66 earth masses. b has an eccentricity 0.44, placing it among most eccentric planets...
We present the detection of a warm Neptune orbiting M dwarf Gl 378, using radial velocity measurements obtained with SOPHIE spectrograph at Observatoire de Haute-Provence. The star was observed in context exoplanet consortium’s sub-programme dedicated to finding planets around dwarfs. 378 is an M1 star, solar metallicity, distance 14.96 pc. single planet detected, b, has minimum mass 13.02 Earth and orbital period 3.82 days, which place it lower boundary hot desert. As one only few such...
SPIRou is the newest spectropolarimeter and high-precision velocimeter that has recently been installed at Canada-France-Hawaii Telescope on Maunakea, Hawaii. It operates in near-infrared simultaneously covers 0.98-2.35 {\mu}m domain high spectral resolution. optimized for exoplanet search characterization with radial-velocity technique, polarization measurements stellar lines subsequent magnetic field studies. The host of transiting hot Jupiter HD 189733 b observed during early science...
We present the discovery and characterization of WASP-148, a new extrasolar system that includes at least two giant planets. The host star is slowly rotating inactive late-G dwarf with V=12 magnitude. planet WASP-148b hot Jupiter 0.72 R_Jup 0.29 M_Jup transits its an orbital period 8.80 days. found planetary candidate SuperWASP photometric survey, then characterized it SOPHIE spectrograph. Our radial velocity measurements subsequently revealed second in system, WASP-148c, 34.5 days minimum...
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...
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...
Periodic radial velocity variations in the nearby M-dwarf star Gl411 are reported, based on measurements with SOPHIE spectrograph. Current data do not allow us to distinguish between a 12.95-day period and its one-day alias at 1.08 days, but favour former slightly. The variation has an amplitude of 1.6 m/s, making this lowest-amplitude signal detected up now. We have performed detailed analysis significance origin, including extensive simulations both uncorrelated correlated noise,...
Abstract We present the discovery of a highly irradiated and moderately inflated ultrahot Jupiter, TOI-1431b/MASCARA-5 b (HD 201033b), first detected by NASA’s Transiting Exoplanet Survey Satellite mission (TESS) Multi-site All-Sky Camera (MASCARA). The signal was established to be planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, EXPRES, which show reflex motion K = 294.1 ± 1.1 m s −1 . A joint analysis TESS ground-based photometry reveals that...
We announce the discovery of GPX-1 b, a transiting brown dwarf with mass $19.7\pm 1.6$ $M_{\mathrm{Jup}}$ and radius $1.47\pm0.10$ $R_{\mathrm{Jup}}$, first sub-stellar object discovered by Galactic Plane eXoplanet (GPX) survey. The transits moderately bright ($V$ = 12.3 mag) fast-rotating F-type star projected rotational velocity $v\sin{ i_*}=40\pm10$ km/s. use isochrone placement algorithm to characterize host star, which has effective temperature $7000\pm200$ K, $1.68\pm0.10$...
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...