Elisabeth C. Matthews
A5083256570- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Astronomical and nuclear sciences
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- History and Developments in Astronomy
- Archaeology and ancient environmental studies
- Phase Equilibria and Thermodynamics
- Optical Systems and Laser Technology
- CCD and CMOS Imaging Sensors
- Methane Hydrates and Related Phenomena
- Scientific Research and Discoveries
- Distributed and Parallel Computing Systems
- Rare-earth and actinide compounds
Max Planck Institute for Astronomy
2023-2025
University of Geneva
2021-2024
Massachusetts Institute of Technology
2019-2023
University of California, Santa Cruz
2022
Centre National de la Recherche Scientifique
2022
Aix-Marseille Université
2022
Observatoire Cantonal de Neuchâtel
2021
Global Social Observatory
2021
Kavli Institute for Particle Astrophysics and Cosmology
2019-2020
University of Exeter
2015-2018
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 The future of exoplanet science is bright, as Transiting Exoplanet Survey Satellite ( TESS ) once again demonstrates with the discovery its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in 36 day orbit around bright V = 8.1) nearby (16 pc) K4.5 dwarf. measures be R ⊕ , and combined archival follow-up precision radial velocity data put mass at M . contributes Level 1 Science Requirement providing 50 transiting planets smaller than 4...
We present the confirmation of two new planets transiting nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, $V=13.07$, $K_s=8.204$, $R_s$=0.374 R$_{\odot}$, $M_s$=0.401 M$_{\odot}$, d=22 pc). The planet candidates are identified in a single TESS sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, high-resolution imaging. With measured orbital periods $P_b=0.77$ days, $P_c=12.25$ days sizes $r_{p,b}=1.33\pm 0.07$ R$_{\oplus}$, $r_{p,c}=2.30\pm 0.16$...
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,...
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMR). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, 700-Myr-old G star hosting at least 6 transiting planets between $\sim$2 and 5 $R_\oplus$. The orbital period ratios deviate from exact commensurability by only $10^{-4}$, smaller than $\sim$\,$10^{-2}$ deviations seen in typical Kepler near-resonant...
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...
Of the approximately 25 directly imaged planets to date, all are younger than 500 Myr, and but six 100 Myr (ref.
Context. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk. JWST/NIRCam offers a unique opportunity to characterize them and their birth environment at wavelengths difficult access from ground. Aims. We aim image circumstellar of 1.87 $\mu$m 4.83 $\mu$m, assess presence Pa-$\alpha$ emission due accretion onto protoplanets, probe any IR excess indicative heated circumplanetary material. Methods. obtain non-coronagraphic images MINDS (MIRI mid-INfrared Disk...
Abstract JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates still unconfirmed and many the best planets for atmospheric characterization may remain be identified. We present a sample TESS that we identify as “best-in-class” transmission emission spectroscopy with JWST. These targets sorted into bins across equilibrium...
We present the discovery and characterisation of two transiting planets observed by Transiting Exoplanet Survey Satellite (TESS) orbiting nearby (d ~ 22 pc), bright (J 9 mag) M3.5 dwarf LTT 3780 (TOI-732). confirm both their association with via ground-based photometry determine masses using precise radial velocities measured CARMENES spectrograph. Precise stellar parameters determined from high resolution spectra that is a mid-M an effective temperature T_eff = 3360 +\- 51 K, surface...
We know little about the outermost exoplanets in planetary systems because our detection methods are insensitive to moderate-mass planets on wide orbits. However, debris discs can probe outer-planet population dynamical modelling of observed reveal properties perturbing planets. use four sculpting and stirring arguments infer planet 178 debris-disc from ISPY, LEECH, LIStEN planet-hunting surveys. Similar analyses often conducted for individual discs, but we consider a large sample consistent...
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....
Abstract The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number confirmed planets from Kepler. Owing to differences in survey design, continues provide that are better suited for subsequent follow-up studies, including mass measurement through radial velocity (RV) observations, compared Kepler targets. In this work, we present TESS-Keck Survey’s (TKS) Mass Catalog: a uniform analysis all TKS RV...
The gap between two component debris disks is often taken to be carved by intervening planets scattering away the remnant planetesimals. We employ N-body simulations determine how time needed clear depends on location of and mass planets. invert this relation, provide an equation for minimum planet mass, another expected number such planets, that must present produce observed a star given age. show can combined with upper limits planetary system from direct imaging non-detections (such as...
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at distance 10.6 pc. Using Gaia-measured and broad-band photometry we find that host star is an M3 dwarf. Combined with TESS transits from sectors, corresponding stellar parameters yield planet radii ranging 0.8REarth to 1.6REarth. All have short orbital periods, 2.25 7.45 days outer pair just wide 2:1 period resonance....
We present 0.95–1.80 μm spectroscopy of the ∼12–27 MJup companion orbiting faint (R ∼ 13.6), young (∼120 Myr) M-dwarf 2MASS J01225093–2439505 ("2M0122–2439 B") at 1 5 separation (50 AU). Our coronagraphic long-slit was obtained with new high contrast imaging platform Very Large Telescope Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) during Science Verification. The unique capability SPHERE enables spectral resolution an order magnitude higher than other extreme AO exoplanet...
We report the Transiting Exoplanet Survey Satellite ($TESS$) detection of a multi-planet system orbiting $V=10.9$ K0 dwarf TOI 125. find evidence for up to five planets, with varying confidence. Three high signal-to-noise transit signals correspond sub-Neptune-sized planets ($2.76$, $2.79$, and $2.94\ R_{\oplus}$), we statistically validate planetary nature two inner ($P_b = 4.65$ days, $P_c 9.15$ days). With only transits observed, outer object ($P_{.03} 19.98$ days) as ratio planet...
We report the discovery and characterization of two transiting planets around bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M 0.54+-0.03 Msun) detected during Sector 10 observations Transiting Exoplanet Survey Satellite (TESS). Combining TESS photometry with HARPS radial velocities, as well ground-based follow-up transit from MEarth LCOGT telescopes, we measured for inner planet, TOI-776 b, a period 8.25 d, radius 1.85+-0.13 Re, mass 4.0+-0.9 Me; outer c, 15.66 2.02+-0.14 5.3+-1.8 Me....
We report the discovery of TOI-561, a multi-planet system in galactic thick disk that contains rocky, ultra-short period planet (USP). This bright ($V=10.2$) star hosts three small transiting planets identified photometry from NASA TESS mission: TOI-561 b (TOI-561.02, P=0.44 days, $R_b = 1.45\pm0.11\,R_\oplus$), c (TOI-561.01, P=10.8 $R_c=2.90\pm0.13\,R_\oplus$), and d (TOI-561.03, P=16.3 $R_d=2.32\pm0.16\,R_\oplus$). The is chemically ([Fe/H]$=-0.41\pm0.05$, [$\alpha$/H]$=+0.23\pm0.05$)...
We report the discovery of two planetary systems around comoving stars; TOI-2076 (TIC 27491137) and TOI-1807 180695581). is a nearby (41.9 pc) multi-planetary system orbiting young (204$\pm$50 Myr), bright (K = 7.115 in TIC v8.1). hosts single transiting planet, similarly (42.58pc), (180$\pm$40 bright. Both targets exhibit significant, periodic variability due to star spots, characteristic their ages. Using photometric data collected by TESS we identify three planets with radii...