Search Publications
The Thickness of Galaxy Disks from z = 5 to 0 Probed by JWST
Lian, Jianhui; Luo, Li
Although a thick disk is a structure prevalent in local disk galaxies and also present in our home Galaxy, its formation and evolution are still unclear. Whether the thick disk is born thick and/or gradually heated to be thick after formation is under debate. To disentangle these two scenarios, one effective approach is to inspect the thickness of…
JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog
Pascucci, Ilaria; Banzatti, Andrea; Bergin, Edwin A. +16 more
It has been proposed, and confirmed by multiple observations, that disks around low-mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we present JWST Disk Infrared Spectral Chemistry Survey MIRI-MRS observations of the solar-mass star DoAr 33, a lo…
TESS Giants Transiting Giants. IV. A Low-density Hot Neptune Orbiting a Red Giant Star
Rice, Malena; Angus, Ruth; Huber, Daniel +14 more
Hot Neptunes, gaseous planets smaller than Saturn (∼3–8 R ⊕) with orbital periods less than 10 days, are rare. Models predict this is due to high-energy stellar irradiation stripping planetary atmospheres over time, often leaving behind only rocky planetary cores. Using our TESS full-frame-image pipeline giants in conjunction with Keck/…
Disentangling the association of PAH molecules with star formation. Insights from the James Webb Space Telescope and from the UltraViolet Imaging Telescope
Mathew, Blesson; Kartha, Sreeja S.; Subramanian, Smitha +4 more
Context. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous complex molecules in the interstellar medium and are used as an indirect indicator of star formation. On the other hand, the ultraviolet (UV) emission from young massive stars directly traces the star formation activity in a galaxy. The James Webb Space Telescope (JWST), along with th…
Small and Large Dust Cavities in Disks around Mid-M Stars in Taurus
Pascucci, Ilaria; Herczeg, Gregory J.; Johnstone, Doug +10 more
High angular resolution imaging by Atacama Large Millimeter/submillimeter Array (ALMA) has revealed the near universality and diversity of substructures in protoplanetary disks. However, disks around M-type pre-main-sequence stars are still poorly sampled, despite the prevalence of M dwarfs in the Galaxy. Here we present high-resolution (∼50 mas, …
The GUAPOS project - V: The chemical ingredients of a massive stellar protocluster in the making
Testi, L.; Mininni, C.; Lorenzani, A. +9 more
Most stars, including the Sun, are born in rich stellar clusters containing massive stars. Therefore, the study of the chemical reservoir of massive star-forming regions is crucial to understand the basic chemical ingredients available at the dawn of planetary systems. We present a detailed study of the molecular inventory of the hot molecular cor…
Observations with the Differential Speckle Survey Instrument. XI. First Year of Observations from Apache Point Observatory
Majewski, Steven R.; Henry, Todd J.; Chanover, Nancy J. +18 more
The Differential Speckle Survey Instrument (DSSI) was relocated to the Astrophysical Research Consortium 3.5 m telescope at Apache Point Observatory (APO) in early 2022. Here we present results from the first year of observations along with an updated instrument description for DSSI at APO, including a detailed description of a new internal slit m…
JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium
Saintonge, Amélie; Gordon, Karl D.; Sandstrom, Karin M. +37 more
We present new JWST observations of the nearby, prototypical edge-on, spiral galaxy NGC 891. The northern half of the disk was observed with NIRCam in its F150W and F277W filters. Absorption is clearly visible in the mid-plane of the F150W image, along with vertical dusty plumes that closely resemble the ones seen in the optical. A ∼10 × 3 kpc
Systematic comparison of neural networks used in discovering strong gravitational lenses
Sonnenfeld, Alessandro; Wong, Kenneth C.; Jaelani, Anton T. +6 more
Efficient algorithms are being developed to search for strong gravitational lens systems owing to increasing large imaging surveys. Neural networks have been successfully used to discover galaxy-scale lens systems in imaging surveys such as the Kilo Degree Survey, Hyper-Suprime Cam (HSC) Survey, and Dark Energy Survey over the last few years. Thus…
Probing the Spectrum of the Magnetar 4U 0142+61 with JWST
Temim, Tea; Pavlov, George G.; Kargaltsev, Oleg +3 more
JWST observed the magnetar 4U 0142+61 with the Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) instruments within a 77 minute time interval on 2022 September 20–21. The low-resolution MIRI spectrum and NIRCam photometry show that the spectrum in the wavelength range 1.4–11 µm range can be satisfactorily described by an absor…