Emily Rickman
A5029274427- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Chemical Thermodynamics and Molecular Structure
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Space Exploration and Technology
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Astronomical and nuclear sciences
- Paleontology and Stratigraphy of Fossils
- Scientific Measurement and Uncertainty Evaluation
- Particle Accelerators and Free-Electron Lasers
- Thermodynamic properties of mixtures
Space Telescope Science Institute
2020-2024
European Space Agency
2021-2023
University of Geneva
2018-2022
Urology of Virginia
2022
Global Social Observatory
2019-2021
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is $<$20 M$_\mathrm{Jup}$ widely separated ($\sim$8\arcsec, = 150 au), young, companion that shares photometric colors and spectroscopic features with directly imaged exoplanets HR 8799 c, d, e. As an L-to-T transition object, exists along region color-magnitude diagram where substellar atmospheres from cloudy clear. observed 1256~b \textit{JWST}'s NIRSpec IFU MIRI MRS modes for coverage 1 $\mu$m 20 at...
We present JWST Early Release Science (ERS) coronagraphic observations of the super-Jupiter exoplanet, HIP 65426 b, with Near-Infrared Camera (NIRCam) from 2-5 $\mu$m, and Mid-Infrared Instrument (MIRI) 11-16 $\mu$m. At a separation $\sim$0.82" (86$^{+116}_{-31}$ au), b is clearly detected in all seven our observational filters, representing first images an exoplanet to be obtained by JWST, ever direct detection beyond 5 These demonstrate that exceeding its nominal predicted performance up...
Abstract Clouds are prevalent in many of the exoplanet atmospheres that have been observed to date. For transiting exoplanets, we know if clouds present because they mute spectral features and cause wavelength-dependent scattering. While exact composition these is largely unknown, this information vital understanding chemistry energy budget planetary atmospheres. In work, observe one transit hot Jupiter WASP-17b with JWST’s Mid-Infrared Instrument Low Resolution Spectrometer generate a...
Abstract We present the first JWST Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) observations of prominent debris disk around β Pictoris. Coronagraphic in eight filters spanning from 1.8 to 23 μ m provide an unprecedentedly clear view at these wavelengths. The objectives observing program were investigate dust composition distribution presence planets system. In this paper, we focus on components, providing surface brightness measurements for all images a detailed...
Context. Large surveys with new-generation high-contrast imaging instruments are needed to derive the frequency and properties of exoplanet populations separations from ~5 300 au. A careful assessment stellar is crucial for a proper understanding when, where, how frequently planets form, they evolve. The sensitivity detection limits age makes this key parameter direct surveys. Aims. We describe SpHere INfrared survey Exoplanets (SHINE), largest planet-search campaign initiated at VLT in 2015...
Aims. We aim to demonstrate that the presence and mass of an exoplanet can now be effectively derived from astrometry another exoplanet. Methods. combined previous β Pictoris b with a new set observations GRAVITY interferometer. The orbital motion is fit using Markov chain Monte Carlo simulations in Jacobi coordinates. inner planet, c, was also reobserved at separation 96 mas, confirming estimations. Results. From planet only, we (i) detect c (ii) constrain its 10.04 −3.10 +4.53 M Jup . If...
The direct characterization of exoplanetary systems with high contrast imaging is among the highest priorities for broader exoplanet community. As large space missions will be necessary detecting and characterizing exo-Earth twins, developing techniques technology exoplanets a driving focus For first time, JWST directly observe extrasolar planets at mid-infrared wavelengths beyond 5$\mu$m, deliver detailed spectroscopy revealing much more precise chemical abundances atmospheric conditions,...
Abstract The carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that number exoplanets have measured C/O ratios, it is possible to examine this at population level. Here, we present analysis currently ratios directly imaged and transit/eclipse planets. First, derive atmospheric parameters for the substellar companion HD 284149 AB b using data taken with OSIRIS integral field spectrograph W.M. Keck Observatory report...
With four companions at separations from 16 to 71 au, HR 8799 is a unique target for direct imaging, presenting an opportunity the comparative study of exoplanets with shared formation history. Combining new VLTI/GRAVITY observations obtained within ExoGRAVITY program archival data, we perform systematic atmospheric characterisation all planets. We explore different levels model flexibility understand temperature structure, chemistry and clouds each planet using both petitRADTRANS retrievals...
Abstract The unprecedented medium-resolution ( R λ ∼ 1500–3500) near- and mid-infrared (1–18 μ m) spectrum provided by JWST for the young (140 ± 20 Myr) low-mass (12–20 M Jup ) L–T transition (L7) companion VHS 1256 b gives access to a catalog of molecular absorptions. In this study, we present comprehensive analysis data set utilizing forward-modeling approach applying our Bayesian framework, ForMoSA . We explore five distinct atmospheric models assess their performance in estimating key...
Abstract The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3 5 μ m at moderate spectral resolution ( R ∼ 2700) and thereby better constrain the composition, disequilibrium chemistry, cloud properties of their atmospheres. In this work, we present first IFU high-contrast observations substellar companion that requires starlight suppression techniques. We develop specific data-reduction strategies study faint companions around...
Context. PDS 70 is a young (5.4 Myr), nearby (~113 pc) star hosting known transition disk with large gap. Recent observations SPHERE and NACO in the near-infrared (NIR) allowed us to detect planetary mass companion, PDS70b, within cavity. Moreover, H_alpha MagAO MUSE revealed emission associated PDS70b another new companion candidate, PDS70c, at larger separation from star. Aims. Our aim confirm discovery of second planet PDS70c using VLT, further characterize its physical properties, search...
The detection of a wide range substructures such as rings, cavities and spirals has become common outcome high spatial resolution imaging protoplanetary disks, both in the near-infrared scattered light thermal millimetre continuum emission. most frequent interpretation their origin is presence planetary-mass companions perturbing gas dust distribution disk (perturbers), but so far only bona-fide been two giant planets around PDS 70. Here, we collect sample 15 disks showing SPHERE images...
Aims. HD 206893 is a nearby debris disk star that hosts previously identified brown dwarf companion with an orbital separation of ∼10 au. Long-term precise radial velocity (RV) monitoring, as well anomalies in the system proper motion, has suggested presence additional, inner system. Methods. Using information from ongoing precision RV measurements HARPS spectrograph, Gaia host astrometry, we have undertaken multi-epoch search for purported additional planet using VLTI/GRAVITY instrument....
The SHINE project is a 500-star survey performed with SPHERE on the VLT for purpose of directly detecting new substellar companions and understanding their formation early evolution. Here we present an initial statistical analysis subsample 150 stars that are representative full sample. Our goal to constrain frequency masses between 1 75 MJup semimajor axes 5 300 au. We adopt detection limits as function angular separation from data all converted into mass projected orbital using...
Abstract We develop and disseminate effective point-spread functions geometric-distortion solutions for high-precision astrometry photometry with the JWST NIRISS instrument. correct field dependencies detector effects, assess quality temporal stability of calibrations. As a scientific application validation, we study proper motion (PM) kinematics stars in calibration near Large Magellanic Cloud (LMC) center, comparing to first-epoch Hubble Space Telescope (HST) archival catalog 16 yr...
Abstract We present a performance analysis for the aperture masking interferometry (AMI) mode on board James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS). Thanks to self-calibrating observables, AMI accesses inner working angles down even within classical diffraction limit. The scientific potential of this has recently been demonstrated by Early Release Science (ERS) 1386 program with deep search close-in companions in HIP 65426 exoplanetary system. As...
Context. Since 2019, GRAVITY has provided direct observations of giant planets and brown dwarfs at separations down to 95 mas from the host star. Some these have first confirmation companions previously detected by indirect techniques (astrometry radial velocities). Aims. We want improve observing strategy data reduction in order lower inner working angle dual-field on-axis mode. also determine current limitations instrument when faint with 30–150 range. Methods. To angle, we propose a fiber...
HIP 65426 b is a recently discovered exoplanet imaged during the course of SPHERE-SHINE survey. Here we present new $L'$ and $M'$ observations planet from NACO instrument at VLT NACO-ISPY survey, as well $Y-H$ spectrum $K$-band photometry SPHERE-SHINE. Using these data, confirm nature companion warm, dusty with mid-L spectral type. From comparison its SED BT-Settl atmospheric models, derive best-fit effective temperature $T_{\text{eff}}=1618\pm7$ K, surface gravity $\log...
Context. The 51 Eridani system harbors a complex architecture with its primary star forming hierarchical the binary GJ 3305AB at projected separation of 2000 au, giant planet orbiting 13 and low-mass debris disk around possibly cold component warm inferred from spectral energy distribution. Aims. We aim to better constrain orbital parameters known planet. Methods. monitored over three years 2015 2018 VLT/SPHERE exoplanet imaging instrument. Results. measure an motion for ~130 mas slightly...
Jets are rarely associated with pre-main-sequence intermediate-mass stars. Optical and near-IR observations of jet-driving sources often hindered by the presence a natal envelope. around partly embedded useful diagnostic to constrain geometry concealed protoplanetary disk. In fact, mechanisms affected both spatial anisotropies episodic variations at (sub-)au scale from star. We obtained rich set high-contrast VLT/SPHERE 0.6 micron 2.2 young star RY Tau. Given proximity Sun this source, our...
The occurrence rate of long-period giant planets around young stars is highly uncertain since it not only governed by the protoplanetary disc structure and planet formation process, but also reflects dynamical re-structuring processes after as well possible capture formed in-situ. Direct imaging currently feasible method to detect such wide-orbit constrain their rate. We carry out a large L'-band high-contrast direct survey for with or debris discs using NACO instrument at ESO Very Large...
The companion GL229B was recently resolved by Xuan et al. (2024) as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry VLT-CRIRES+ RV measurements. Here, we present Bayesian models the interferometric data in additional detail, along with an updated outer orbit dwarf pair about primary. To create model inner robust uncertainties, apply kernel phases to GRAVITY address baseline redundancy raw closure phases. Using parallel tempering, constrain binary's using...
Abstract The companion GL229B was recently resolved by Xuan et al. as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry Very Large Telescope-CRIRES+ radial velocity (RV) measurements. Here, we present Bayesian models the interferometric RV data in additional detail, along with an updated outer orbit dwarf pair about primary. To create model inner robust uncertainties, apply kernel phases to GRAVITY data, address baseline redundancy raw closure phases. Using...