Franck Marchis
A5074920541- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Isotope Analysis in Ecology
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Calibration and Measurement Techniques
- Geological and Geochemical Analysis
- Optical Systems and Laser Technology
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Space Science and Extraterrestrial Life
- Atmospheric Ozone and Climate
- Spacecraft Design and Technology
- Space Satellite Systems and Control
- Space exploration and regulation
- Advanced optical system design
- Laser-induced spectroscopy and plasma
- Geology and Paleoclimatology Research
- History and Developments in Astronomy
- CCD and CMOS Imaging Sensors
Search for Extraterrestrial Intelligence
2015-2024
University of Southern Queensland
2023-2024
Observatoire de Paris
2011-2024
Laboratoire d’Astrophysique de Marseille
2019-2023
Centre National de la Recherche Scientifique
2008-2023
Caterpillar (United States)
2021-2023
National Astronomical Observatory of Japan
2014-2023
National Institutes of Natural Sciences
2023
Aix-Marseille Université
2019-2022
Délégation Provence et Corse
2019-2022
The Gemini Planet Imager is a dedicated facility for directly imaging and spectroscopically characterizing extrasolar planets. It combines very high-order adaptive optics system, diffraction-suppressing coronagraph, an integral field spectrograph with low spectral resolution but high spatial resolution. Every aspect of the has been tuned maximum sensitivity to faint planets near bright stars. During first-light observations, we achieved estimated H band Strehl ratio 0.89 5-σ contrast 10(6)...
Abstract We present a statistical analysis of the first 300 stars observed by Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections our contrast curves we infer underlying distributions substellar companions with respect to their mass, semimajor axis, host stellar mass. uncover strong correlation between planet occurrence rate star M * > 1.5 ⊙ more likely masses 2 13 Jup axes 3–100 au at 99.92% confidence. fit...
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems serves as testbed technologies ELTs. It multi-band which makes use light from 600 to 2500nm allowing coronagraphic direct exoplanet inner 3 lambda/D stellar host. Wavefront sensing control are key operation SCExAO. A partial correction low-order modes provided by Subaru's facility adaptive optics...
An exoplanet extracted from the bright Direct imaging of Jupiter-like exoplanets around young stars provides a glimpse into how our solar system formed. The brightness requires use next-generation devices such as Gemini Planet Imager (GPI). Using GPI, Macintosh et al. discovered planet orbiting star, 51 Eridani (see Perspective by Mawet). planet, Eri b, has methane signature and is probably smallest that been directly imaged. These findings open door to understanding origins herald dawn new...
We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30-day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination multi-wavelength, high-precision, high-cadence, and long-duration data opens new window into time domain behavior stellar objects. Here we provide an overview observations, focusing results from Spitzer CoRoT. highlight this work is detailed analysis 162 classical T Tauri...
Abstract On 26 September 2022, the Double Asteroid Redirection Test (DART) spacecraft struck Dimorphos, a satellite of asteroid 65803 Didymos 1 . Because it is binary system, possible to determine how much orbit changed, as part test what necessary deflect an that might threaten Earth with impact. In nominal cases, pre-impact predictions orbital period reduction ranged from roughly 8.8 17 min (refs. 2,3 ). Here we report optical observations Dimorphos before, during and after impact,...
We present initial results from time-series imaging at infrared wavelengths of 0.9 deg2 in the Orion Nebula Cluster (ONC). During Fall 2009 we obtained 81 epochs Spitzer 3.6 and 4.5 μm data over 40 consecutive days. extracted light curves with ∼3% photometric accuracy for ∼2000 ONC members ranging several solar masses down to well below hydrogen-burning mass limit. For many stars, also have photometry optical (Ic) and/or near-infrared (JKs) wavelengths. Our set can be mined determine stellar...
We present the first results from polarimetry mode of Gemini Planet Imager (GPI), which uses a new integral field architecture to provide high contrast linear with minimal systematic biases between orthogonal polarizations. describe design, data reduction methods, and performance GPI. Point spread function subtraction via differential suppresses unpolarized starlight by factor over 100, provides sensitivity circumstellar dust reaching photon noise limit for these observations. In case disk...
We present spectro-photometry spanning 1-5 $\mu$m of 51 Eridani b, a 2-10 M$_\text{Jup}$ planet discovered by the Gemini Planet Imager Exoplanet Survey. In this study, we new $K1$ (1.90-2.19 $\mu$m) and $K2$ (2.10-2.40 spectra taken with as well an updated $L_P$ (3.76 $M_S$ (4.67 photometry from NIRC2 Narrow camera. The data were combined $J$ (1.13-1.35 $H$ (1.50-1.80 discovery epoch goal better characterizing properties. Eri b is redder than field brown dwarfs known young T-dwarfs similar...
We present a new matched filter algorithm for direct detection of point sources in the immediate vicinity bright stars. The stellar Point Spread Function (PSF) is first subtracted using Karhunen-Lo\'eve Image Processing (KLIP) with Angular and Spectral Differential Imaging (ADI SDI). KLIP-induced distortion astrophysical signal included template by computing forward model PSF at every position image. To optimize performance algorithm, we conduct extensive planet injection recovery tests tune...
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...
We present optical and near-infrared high contrast images of the transitional disk HD 100546 taken with Magellan Adaptive Optics system (MagAO) Gemini Planet Imager (GPI). GPI data include both polarized intensity total imagery, MagAO are in Simultaneous Differential Imaging mode at H{\alpha}. The new H -band represent a significant enhancement sensitivity field rotation compared to previous sets enable detailed exploration substructure disk. processed variety differential imaging techniques...
Abstract Using the Gemini Planet Imager located at South, we measured near-infrared (1.0–2.4 μ m) spectrum of planetary companion to nearby, young star β Pictoris. We compare obtained with currently published model grids and known substellar objects present best matching models as well observed objects. Comparing empirical measurement bolometric luminosity evolutionary models, find a mass 12.9 ± 0.2 <?CDATA ${{ \mathcal M }}_{\mathrm{Jup}}$?> , an effective temperature 1724 15 K, radius 1.46...
The Gemini Planet Imager (GPI) has as its science instrument an infrared integral field spectrograph/polarimeter (IFS). Integral spectrographs are scientificially powerful but require sophisticated data reduction systems. For GPI to achieve scientific goals of exoplanet and disk characterization, IFS must be reconstructed into high quality astrometrically photometrically accurate datacubes in both spectral polarization modes, via flexible software that is usable by the broad community....
A principal scientific goal of the Gemini Planet Imager (GPI) is obtaining milliarcsecond astrometry to constrain exoplanet orbits. However, directly imaged exoplanets subject biases, systematic errors, and speckle noise. Here we describe an analytical procedure forward model signal that accounts for both observing strategy (angular spectral differential imaging) data reduction method (Karhunen-Lo\`eve Image Projection algorithm). We use this measure position in a Bayesian framework...
We present H band spectroscopic and Halpha photometric observations of HD 100546 obtained with GPI MagAO. detect emission at the location protoplanet 100546b, but show that choice data processing parameters strongly affects morphology this source. It appears point-like in some aggressive reductions, rejoins an extended disk structure majority others. Furthermore, we demonstrate stationary on a timescale 4.6 yrs, inconsistent 2sigma level Keplerian clockwise orbit 59 au plane. The spectrum is...
We present the first scattered light detections of HD 106906 debris disk using Gemini/Gemini Planet Imager in infrared and Hubble Space Telescope (HST)/Advanced Camera for Surveys optical. is a 13 Myr old F5V star Sco–Cen association, with previously detected planet-mass candidate 106906b projected 650 AU from host star. Our observations reveal near edge-on that has central cleared region radius ∼50 AU, an outer extent >500 AU. The HST data show regions are highly asymmetric, resembling...
Abstract We report the results of a ∼4 yr direct imaging survey 104 stars to resolve and characterize circumstellar debris disks in scattered light as part Gemini Planet Imager (GPI) Exoplanet Survey. targeted nearby (≲150 pc), young (≲500 Myr) with high infrared (IR) excesses ( L IR / ⋆ > 10 −5 ), including 38 previously resolved disks. Observations were made using GPI high-contrast integral field spectrograph H -band (1.6 μ m) coronagraphic polarimetry mode measure both polarized total...
Context. Until recently, the 3D shape, and therefore density (when combining volume estimate with available mass estimates), surface topography of vast majority largest ( D ≥ 100 km) main-belt asteroids have remained poorly constrained. The improved capabilities SPHERE/ZIMPOL instrument opened new doors into ground-based asteroid exploration. Aims. To constrain formation evolution a representative sample large asteroids, we conducted high-angular-resolution imaging survey 42...
Quaoar is a classical Trans-Neptunian Object (TNO) with an area equivalent diameter of 1,100 km and orbital semi-major axis 43.3 astronomical units. Based on stellar occultations observed between 2018 2021, inhomogeneous ring (Q1R, Quaoar's first ring) was detected around this body. Aims. A new occultation by August 9th, 2022 aiming to improve shape models the physical parameters Q1R while searching for additional material Methods. The provided nine effective chords across Quaoar, pinning...