Search Publications
Missions
Journals
Publication Years
Searching for Planets Orbiting Fomalhaut with JWST/NIRCam
Johnstone, Doug; Rieke, George H.; Krist, John E. +20 more
We report observations with the JWST/NIRCam coronagraph of the Fomalhaut (α PsA) system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite. Observations in F444W and F356W filters using the round 430R mask achieve a contrast ratio of ~4 × 10-7 at 1″ and ~4 × 10-8 outside of 3″. These obser…
Three sub-Jovian-mass microlensing planets: MOA-2022-BLG-563Lb, KMT-2023-BLG-0469Lb, and KMT-2023-BLG-0735Lb
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +45 more
Aims: We analyze the anomalies appearing in the light curves of the three microlensing events MOA-2022-BLG-563, KMT-2023-BLG-0469, and KMT-2023-BLG-0735. The anomalies exhibit common short-term dip features that appear near the peak.
Methods: From the detailed analyses of the light curves, we find that the anomalies were produced by plan…
Deep JWST/NIRCam imaging of Supernova 1987A
Larsson, J.; Lundqvist, P.; Spyromilio, J. +46 more
JWST/NIRCam obtained high angular resolution (0.05-0.1 arcsec), deep near-infrared 1-5 $\mu$m imaging of Supernova (SN) 1987A taken 35 yr after the explosion. In the NIRCam images, we identify: (1) faint H2 crescents, which are emissions located between the ejecta and the equatorial ring, (2) a bar, which is a substructure of the ejecta…
LHS 475 b: A Potential Venus Analog Orbiting a Nearby M Dwarf
Kostov, Veselin B.; Horne, Keith; Collins, Karen A. +15 more
Based on photometric observations by TESS, we present the discovery of a potential Venus analog transiting LHS 475, an M3 dwarf located 12.5 pc from the Sun. The mass of the star is 0.274 ± 0.015 M ☉. The planet, originally reported as TOI 910.01, has an orbital period of 2.0291010 ± 0.0000017 days and an estimated radius of 0.975 ± 0.0…
The cosmic timeline implied by the JWST reionization crisis
Melia, F.
Context. JWST's discovery of well-formed galaxies and supermassive black holes only a few hundred million years after the big bang, and the identification of polycyclic aromatic hydrocarbons (PAHs) at z = 6.71, seriously challenge the timeline predicted by ΛCDM. Moreover, the implied bright UV-irradiation of the early Universe suggests a reionizat…
Tracing the Galactic Disk with the Kinematics of Gaia Cepheids
Wang, Shu; Deng, Licai; Chen, Xiaodian +1 more
Classical Cepheids (CCs) are excellent tracers for understanding the structure of the Milky Way disk. The latest Gaia Data Release 3 provides a large number of line-of-sight velocity information for Galactic CCs, offering an opportunity for studying the kinematics of the Milky Way. We determine the 3D velocities of 2057 CCs relative to the Galacti…
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): PDS 111, an old T Tauri star with a young-looking disk
Mamajek, Eric; Ménard, François; Huang, Jane +20 more
Context. The interplay between T Tauri stars and their circumstellar disks, and how this impacts the onset of planet formation has yet to be established. In the last years, major progress has been made using instrumentation that probes the dust structure in the mid-plane and at the surface of protoplanetary disks. Observations show a great variety…
Discovery of spin-phase-dependent QPOs in the supercritical accretion regime from the X-ray pulsar RX J0440.9+4431
Bozzo, Enrico; Falanga, Maurizio; Malacaria, Christian +5 more
RX J0440.9+4431 is an accreting X-ray pulsar (XRP) that remained relatively unexplored until recently, when major X-ray outburst activity enabled more in-depth studies. Here, we report on the discovery of ~0.2 Hz quasi-periodic oscillations (QPOs) from this source observed with Fermi-GBM. The appearance of QPOs in RX J0440.9+4431 is triple transie…
Dynamic acceleration of energetic protons by an interplanetary collisionless shock
Wang, W.; Wang, L.; Rodríguez-Pacheco, J. +8 more
Context. Interplanetary collisionless shocks are known to be capable of accelerating charged particles up to hundreds of MeV. However, the underlying acceleration mechanisms are still under debate.
Aims: We present the dynamic behaviors of energetic protons that are accelerated by an interplanetary shock that was observed with unprecedented h…
Scylla. III. The Outside-in Radial Age Gradient in the Small Magellanic Cloud and the Star Formation Histories of the Main Body, Wing, and Outer Regions
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Murray, Claire E. +13 more
The proximity of the Large and Small Magellanic Clouds (LMC and SMC) provides the opportunity to study the impact of dwarf–dwarf interactions on their mass assembly with a unique level of detail. To this end, we analyze two-filter broadband imaging of 83 Hubble Space Telescope (HST) pointings covering 0.203 deg2 toward the SMC, extendin…