Search Publications
XUE: Molecular Inventory in the Inner Region of an Extremely Irradiated Protoplanetary Disk
Henning, Thomas; Bik, Arjan; Tabone, Benoît +24 more
We present the first results of the eXtreme UV Environments (XUE) James Webb Space Telescope (JWST) program, which focuses on the characterization of planet-forming disks in massive star-forming regions. These regions are likely representative of the environment in which most planetary systems formed. Understanding the impact of environment on pla…
CLASSY. VI. The Density, Structure, and Size of Absorption-line Outflows in Starburst Galaxies
Martin, Crystal L.; Scarlata, Claudia; Henry, Alaina +12 more
Galaxy formation and evolution are regulated by the feedback from galactic winds. Absorption lines provide the most widely available probe of winds. However, since most data only provide information integrated along the line of sight, they do not directly constrain the radial structure of the outflows. In this paper, we present a method to directl…
Detection of the Low-stellar-mass Host Galaxy of a z 6.25 Quasar with JWST
Lyu, Jianwei; Rieke, George H.; Alberts, Stacey +1 more
We characterize the stellar mass of J2239+0207, a z ~ 6.25 sub-Eddington quasar (M 1450 = -24.6), using dedicated JWST/NIRCam medium-band observations of a nearby point-spread function star to remove the central point source and reveal the underlying galaxy emission. We detect the host galaxy in two bands longward of the Balmer break, o…
JWST NIRSpec Observations of Supernova 1987A-From the Inner Ejecta to the Reverse Shock
Fox, O. D.; Blommaert, J. A. D. L.; Larsson, J. +23 more
We present initial results from JWST NIRSpec integral field unit observations of the nearby supernova SN 1987A. The observations provide the first spatially resolved spectroscopy of the ejecta and equatorial ring (ER) over the 1-5 µm range. We construct 3D emissivity maps of the [Fe I] 1.443 µm line from the inner ejecta and the He I 1…
The Next Generation Virgo Cluster Survey (NGVS). XXXV. First Kinematical Clues of Overly Massive Dark Matter Halos in Several Ultradiffuse Galaxies in the Virgo Cluster
Côté, Patrick; Peng, Eric W.; Ferrarese, Laura +8 more
We present Keck/DEIMOS spectroscopy of the first complete sample of ultradiffuse galaxies (UDGs) in the Virgo cluster. We select all UDGs in Virgo that contain at least 10 globular cluster (GC) candidates and are more than 2.5σ outliers in scaling relations of size, surface brightness, and luminosity (a total of 10 UDGs). We use the radial velocit…
The Cool Circumgalactic Medium of Low-redshift Star-forming Galaxies. I. Empirical Model and Mean Properties
Werk, Jessica K.; Faerman, Yakov
We present an analytic model for the cool, T ~ 104 K, circumgalactic medium (CGM), describing the gas distribution, and thermal and ionization states. Our model assumes (total) pressure equilibrium with the ambient warm/hot CGM, photoionization by the metagalactic radiation, and allows for nonthermal pressure support, parameterized by t…
Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph: Equatorial Latitudes in L Dwarf Atmospheres Are Cloudier
Metchev, Stanimir; Faherty, Jacqueline K.; Vos, Johanna M. +2 more
We report direct observational evidence for a latitudinal dependence of dust cloud opacity in ultracool dwarfs, indicating that equatorial latitudes are cloudier than polar latitudes. These results are based on a strong positive correlation between the viewing geometry and the mid-infrared silicate absorption strength in mid-L dwarfs using mid-inf…
JWST Low-resolution MIRI Spectral Observations of SN 2021aefx: High-density Burning in a Type Ia Supernova
Suntzeff, N. B.; Wang, L.; Galbany, L. +38 more
We present a JWST/MIRI low-resolution mid-infrared (MIR) spectroscopic observation of the normal Type Ia supernova (SN Ia) SN 2021aefx at +323 days past rest-frame B-band maximum light. The spectrum ranges from 4 to 14 µm and shows many unique qualities, including a flat-topped [Ar III] 8.991 µm profile, a strongly tilted [Co III] 11.8…
TESS Observations of the Pleiades Cluster: A Nursery for δ Scuti Stars
Torres, Guillermo; Li, Yaguang; Zhou, George +8 more
We studied 89 A- and F-type members of the Pleiades open cluster, including five escaped members. We measured projected rotational velocities ( $v\sin i$ ) for 49 stars and confirmed that stellar rotation causes a broadening of the main sequence in the color-magnitude diagram. Using time-series photometry from NASA's TESS Mission (plus one star ob…
Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147
Izzo, Luca; Chambers, Kenneth C.; Coulter, David A. +23 more
We present Young Supernova Experiment grizy photometry of SN 2021hpr, the third Type Ia supernova sibling to explode in the Cepheid calibrator galaxy, NGC 3147. Siblings are useful for improving SN-host distance estimates and investigating their contributions toward the SN Ia intrinsic scatter (post-standardization residual scatter in distance est…