Search Publications
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…
First search for ultralight dark matter with a space-based gravitational-wave antenna: LISA Pathfinder
Miller, Andrew L.; Mendes, Luis
We present here results from the first-ever search for dark-photon dark matter that could have coupled to baryons in LISA Pathfinder, the technology demonstrator for a space-based gravitational-wave antenna. After analyzing approximately three months of data taken by LISA Pathfinder in the frequency range [2 ×10-5,5 ] Hz , corresponding…
A UV census of the environments of stripped-envelope supernovae
Sun, Ning-Chen; Crowther, Paul A.; Maund, Justyn R.
This paper reports an environmental analysis of 41 uniformly selected stripped-envelope supernovae (SESNe) based on deep ultraviolet-optical images acquired by the Hubble Space Telescope. Young stellar populations are detected in most SN environments and their ages are derived with a hierarchical Bayesian approach. The age distributions are indist…
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…
Multiple stellar populations in globular clusters with JWST: an NIRCam view of 47 Tucanae
Milone, A. P.; Cordoni, G.; Marino, A. F. +11 more
We use images collected with the near-infrared camera (NIRCam) onboard the JWST and with the Hubble Space Telescope (HST) to investigate multiple populations at the bottom of the main sequence (MS) of 47 Tucanae. The mF115W versus mF115W - mF322W2 colour-magnitude diagram (CMD) from NIRCam shows that, below the kne…
Unveiling Hidden Stellar Aggregates in the Milky Way: 1656 New Star Clusters Found in Gaia EDR3
Luo, Yangping; Wang, Kun; Liu, Xiaochen +2 more
We report 1656 new star clusters found in the Galactic disk (∣b∣ < 20°) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine-learning algorithm, DBSCAN, and following our previous studies, we utilized a unique method to do the data preparation and obtain the clustering coefficients, which proved to be an effective way to searc…
Multimass modelling of Milky Way globular clusters - I. Implications on their stellar initial mass function above 1 M⊙
Hénault-Brunet, V.; Gieles, M.; Baumgardt, H. +2 more
The distribution of stars and stellar remnants (white dwarfs, neutron stars, and black holes) within globular clusters holds clues about their formation and long-term evolution, with important implications for their initial mass function (IMF) and the formation of black hole mergers. In this work, we present best-fitting multimass models for 37 Mi…