Context: HR2562B is a planetary-mass companion located 0.56arcsec (19au) from its host star. It is one of a few L/T transitional objects orbiting a young star. This companion provides insight into the evolution of young objects in the L/T transition. However, its key physical properties, such as Teff and mass, remain poorly constrained, with large uncertainties (34% for Teff, 22% for log(g)) based on near-infrared observations alone. Aims: We aim to refine these uncertainties, especially for Teff (1200-1700K) and log(g) (4-5), using new MIR data from the JWST/MIRI filters (10.65, 11.40, and 15.50 microns), and better understand the companion's chemical composition and its role in the L/T transition. Methods: MIRI data were processed using reference star differential imaging, revealing HR2562B at high S/N (16) in all 3 filters. We used 2 atmospheric models, ATMO and ExoREM, to fit the SED, combining MIR and NIR datasets. Additionally, we used CMD with brown dwarfs to explore the chemical composition of HR2562B's atmosphere and compare it to another L/T transition object, VHS1256b. Results: Our analysis improved the temperature precision (Teff=1255+-15K) by 6x compared to previous estimates. We also narrowed its luminosity to -4.69+-0.01 dex. Surface gravity remains uncertain (4.4-4.8), and its mass is estimated between 8 and 18.5Mj, depending on modeling and astrometry. Sensitivity analysis revealed the ability to detect objects between 2-5Mj at 100au. Conclusions: HR2562B likely has a near cloud-free atmosphere, with the ATMO model fitting better than ExoREM. Silicate absorption features are weak, requiring further spectroscopic observations. While HR2562B and VHS1256b share similarities, they are in different evolutionary stages, making HR2562B key to understanding young objects in the L/T transition. It is likely a planetary-mass companion, suggesting a reclassification as HR2562b.
Inspecting Cloudy Substellar Atmospheres with JWST MIRI Synthetic Magnitudes from Spitzer Mid-infrared Spectra
Department of Physics, Graduate Center, City University of New York（纽约市立大学研究生中心物理系）；Department of Astronomy, Columbia University（哥伦比亚大学天文学系）；Department of Astrophysics, American Museum of Natural History（美国自然历史博物馆天体物理学系）；School of Physics, Trinity College Dublin, The University of Dublin（都柏林三一学院物理学院，都柏林大学）；Department of Physics and Astronomy, Western University（韦仕敦大学物理与天文系）；Institute for Earth and Space Exploration, Western University（韦仕敦大学地球与太空探索研究所）；Department of Physics and Astronomy, Hunter College, City University of New York（纽约市立大学亨特学院物理与天文系）
A Binary Flux Calibrator Reveals the Scientific Potential of Short-integration JWST MIRI Imaging to Directly Detect sub-Jupiter Exoplanets
Eureka Scientific Inc.（Eureka科学公司）；University of Michigan（密歇根大学）；Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）；University of California Santa Cruz（加州大学圣克鲁兹分校）；Massachusetts Institute of Technology（麻省理工学院）；Johns Hopkins APL（约翰斯·霍普金斯大学应用物理实验室）
The origin of complex organic molecules (COMs) in young Class 0 protostars has been one of the major questions in astrochemistry and star formation. While COMs are thought to form on icy dust grains via gas-grain chemistry, observational constraints on their formation pathways have been limited to gas-phase detection. Sensitive mid-infrared spectroscopy with JWST enables unprecedented investigation of COM formation by measuring their ice absorption features. We present an overview of JWST/MIRI MRS spectroscopy and imaging of a young Class 0 protostar, IRAS 15398-3359, and identify several majo…
EX Lup is a low-mass pre-main sequence star that occasionally shows accretion-related outbursts. Here, we present JWST/MIRI medium resolution spectroscopy obtained for EX Lup fourteen years after its powerful outburst. EX Lup is now in quiescence and displays a Class II spectrum. We detect a forest of emission lines from molecules previously identified in infrared spectra of classical T Tauri disks: H2O, OH, H2, HCN, C2H2, and CO2. The detection of organic molecules demonstrates that they are back after disappearing during the large outburst. Spectral lines from water and OH are for the first …
Coordinated Space and Ground-Based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-Infrared Hydrogen Lines as Accretion Diagnostics for JWST-MIRI
本文利用 JWST-MIRI 对 DQ Tau 双星系统三个轨道周期的协调监测，首次确立并校准了中红外氢复合线作为原行星盘吸积光度诊断指标，并据此为 38 个已发表的原行星盘 MRS 光谱档案样本提供了吸积光度。
Silicate Clouds, SiO, and Molecular Trends across the L-T Sequence: A JWST/MIRI LRS Spectral Library of Brown Dwarfs
The University of Western Ontario（韦仕敦大学）；American Museum of Natural History（美国自然历史博物馆）；Centro de Astrobiología, CSIC-INTA（天体生物学中心，CSIC-INTA）；Université de Montréal（蒙特利尔大学）
NIRCam yells at cloud: JWST MIRI imaging can directly detect exoplanets of the same temperature, mass, age, and orbital separation as Saturn and Jupiter
A Characterization of JWST MIRI Detector Persistence and Implications for High-Contrast Imaging
University of Michigan（密歇根大学）；Massachusetts Institute of Technology（麻省理工学院）；Eureka Scientific Inc.（尤里卡科学公司）；JHU Applied Physics Laboratory（约翰霍普金斯大学应用物理实验室）
JWST-MIRI's multi-dimensional view of mass loss in the irradiated disks of NGC 1977
Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森天体物理中心）；Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；Division of Geological and Planetary Sciences, California Institute of Technology（加州理工学院地质与行星科学系）；Astronomy Unit, Department of Physics and Astronomy, Queen Mary University of London（伦敦玛丽女王大学物理与天文学系天文学组）；Lunar and Planetary Laboratory, The University of Arizona（亚利桑那大学月球与行星实验室）；National Radio Astronomy Observatory（国家射电天文台）
First Demonstration of Kernel Phase Interferometry on JWST/MIRI: Prospects for Future Planet Searches Around Post Main Sequence Stars
University of California, Irvine（加州大学尔湾分校）；University of California, Santa Cruz（加州大学圣克鲁兹分校）；University of Texas at Austin（德克萨斯大学奥斯汀分校）；University of Arizona（亚利桑那大学）
To understand the potential for observing forming planets and their circumplanetary disks (CPDs) with JWST and ELT, we created mock observations from 3D radiative hydrodynamic simulations and radiative transfer post-processing for planets with 10, 5, 1 Jupiter and 1 Saturn masses with orbital separation of 50 and 30 AU in 0$^{\circ}$, 30$^{\circ}$ and 60$^{\circ}$ inclinations. Instrumental effects were then simulated with Mirage for JWST/NIRCam and NIRISS, MIRISim for JWST/MIRI and SimCADO & SimMETIS for ELT/MICADO and METIS. We found that the longer wavelengths (mid-IR and beyond) are the be…
A Homogeneous Survey of JWST MIRI Transmission Spectra of 10 Exoplanets
Institute of Astronomy, University of Cambridge（剑桥大学天文学研究所）；Space Telescope Science Institute（太空望远镜科学研究所）；School of Physics and Astronomy, Cardiff University（卡迪夫大学物理与天文学院）
The Medium Resolution Spectrometer on board JWST/MIRI will give access to mid-IR spectra while retaining spatial information. With the unparalleled sensitivity of JWST and the MIRI detectors, the MRS has the potential to revolutionise our understanding of giant exoplanet atmospheres. Molecular mapping is a promising detection and characterisation technique used to study the spectra of directly imaged exoplanets. We aim to examine the feasibility and application of this technique to MRS observations. We used the instrument simulator MIRISIM to create mock observations of resolved star and exopl…
JWST/MIRI coronagraphic search for planets in systems with gapped exoKuiper belts and proper motion anomalies
University of Exeter（埃克塞特大学）；Space Telescope Science Institute (STScI)（太空望远镜科学研究所）；University of Arizona（亚利桑那大学）；University of Warwick（华威大学）；Friedrich-Schiller-Universität Jena（耶拿弗里德里希·席勒大学）；University of Birmingham（伯明翰大学）；University of Queensland（昆士兰大学）；University of Cambridge（剑桥大学）
Young giant planets are the best targets for characterization with direct imaging. The Medium Resolution Spectrometer (MRS) of the Mid-Infrared Instrument (MIRI) of the recently launched James Webb Space Telescope (JWST) will give access to the first spectroscopic data for direct imaging above 5 $μ$m with unprecedented sensitivity at a spectral resolution up to 3700. This will provide a valuable complement to near-infrared data from ground-based instruments for characterizing these objects. We aim to evaluate the performance of MIRI/MRS to detect molecules in the atmosphere of exoplanets and t…
Infrared measurements of asteroids are crucial for the determination of physical and thermal properties of individual objects, and for the understanding of the small-body populations in the solar system as a whole. But standard radiometric methods can only be applied if the orbit of an object is known, hence its position at the time of the observation. We present MIRI observations of the outer-belt asteroid 10920 and an unknown object, detected in all 9 MIRI bands in close proximity to 10920. We developed a new method "STM-ORBIT" to interpret the multi-band measurements without knowing the obj…
MINDS. Young binary systems with JWST/MIRI: Variable water-rich primaries and extended emission
Carnegie Institution for Science（卡内基科学机构）；Leiden University（莱顿大学）；Max-Planck-Institut für Astronomie (MPIA)（马克斯·普朗克天文学研究所）；Rijksuniversiteit Groningen（格罗宁根大学）；KU Leuven（荷语鲁汶大学）；Université de Liège（列日大学）；Texas State University（德克萨斯州立大学）；University of Exeter（埃克塞特大学）
Hot Rocks Survey V: Secondary Eclipse Photometry of GJ 3473 b with JWST/MIRI
Space Telescope Science Institute（太空望远镜科学研究所）；Technical University of Denmark（丹麦技术大学）；University of Southampton（南安普顿大学）；University of Bern（伯尔尼大学）；Johns Hopkins University（约翰斯·霍普金斯大学）；Trinity College Dublin, University of Dublin（都柏林三一学院，都柏林大学）
The Mid-Infrared Instrument (MIRI) on-board JWST will provide imaging, coronagraphy, low-resolution spectroscopy and medium-resolution spectroscopy at unprecedented sensitivity levels in the mid-infrared wavelength range. The Medium-Resolution Spectrometer (MRS) of MIRI is an integral field spectrograph that provides diffraction-limited spectroscopy between 4.9 and 28.3 um, within a FOV varying from 13 to 56" square. From ground testing, we calculate the physical parameters essential to general observers and calibrating the wavelength solution and resolving power of the MRS is critical for max…
We observed a full-orbit phase curve of the hot Jupiter WASP-43b with MIRI/LRS as part of the Transiting Exoplanet Community Early Release Science Program. Here we report preliminary findings for the instrument performance from the team's MIRI Working Group. Overall we find that MIRI's performance for phase curve observations is excellent, with a few minor caveats. The key takeaways for Cycle 2 planning with MIRI/LRS are: (1) long-duration observations (> 24 hours) have now been successfully executed; (2) for phase curves, we recommend including a one-hour burn-in period prior to taking scienc…
Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia and carbon monoxide
