Search Publications
The BANANA Project. VII. High Eccentricity Predicts Spin–Orbit Misalignment in Binaries
Winn, Joshua N.; Albrecht, Simon H.; Lundkvist, Mia S. +3 more
The degree of spin–orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin–or…
Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST
Murray, Claire E.; Gordon, Karl D.; Peek, J. E. G. +2 more
Resolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or migrated there after forming in denser environments. To address this question, we use multiresol…
Gamma-Ray Burst Observations by the High-Energy Particle Detector on board the China Seismo-Electromagnetic Satellite between 2019 and 2021
Vitale, V.; Ubertini, P.; Bazzano, A. +68 more
In this paper we report the detection of five strong gamma-ray bursts (GRBs) by the High-Energy Particle Detector (HEPD-01) mounted on board the China Seismo-Electromagnetic Satellite, operational since 2018 on a Sun-synchronous polar orbit at a ~507 km altitude and 97° inclination. HEPD-01 was designed to detect high-energy electrons in the energ…
oMEGACat. IV. Constraining the Ages of Omega Centauri Subgiant Branch Stars with HST and MUSE
Wang, Z.; Latour, M.; Kacharov, N. +13 more
We present age estimates for over 8100 subgiant branch (SGB) stars in Omega Centauri (ω Cen) to study its star formation history. Our large data set, which combines multi-wavelength Hubble Space Telescope photometry with MUSE metallicities, provides an unprecedented opportunity to measure individual stellar ages. We do this by fitting each star's …
First Constraints on the Interstellar Medium Conditions of a Low-mass, Highly Obscured z = 4.27 Main-sequence Galaxy
Murphy, Eric; McKinney, Jed; Whitaker, Katherine E. +4 more
We present the molecular gas content and interstellar medium conditions of MACS J0717_Az9, a strong gravitationally lensed z = 4.273, M * ≃ 2 × 109 M ⊙ star-forming galaxy with an unusually high (∼80%) obscured star formation fraction. We detect CO (4–3) in two independent lensed images, as well as [N II] 205 &micr…
A Broad Set of Solar and Cosmochemical Data Indicates High C-N-O Abundances for the Solar System
Lunine, Jonathan I.; Glein, Christopher R.; Truong, Ngoc
We examine the role of refractory organics as a major C carrier in the outer protosolar nebula and its implications for the compositions of large Kuiper Belt objects (KBOs) and CI chondrites. By utilizing Rosetta measurements of refractory organics in comet 67P/Churyumov–Gerasimenko, we show that they would make up a large fraction of the protosol…
Preliminary Discussion on the Current Sheet
Zhang, Jun; Ding, Tao; Fang, Yuan +1 more
The current sheet is a characteristic structure of magnetic energy dissipation during the magnetic reconnection process. So far, the width and depth of the current sheet are still indefinite. Here we investigate 64 current sheets observed by four telescopes from 1999 to 2022, and all of them have been well identified in the previous literature. In…
COOL-LAMPS. VI. Lens Model and New Constraints on the Properties of COOL J1241+2219, a Bright z = 5 Lyman Break Galaxy and its z = 1 Cluster Lens
Mahler, Guillaume; Bayliss, Matthew; Sharon, Keren +20 more
We present a strong lensing analysis of COOL J1241+2219, the brightest known gravitationally lensed galaxy at z ≥ 5, based on new multiband Hubble Space Telescope (HST) imaging data. The lensed galaxy has a redshift of z = 5.043, placing it shortly after the end of the "Epoch of Reionization," and an AB magnitude z AB = 20.47 mag (Khull…
Connections between Planetary Populations and Chemical Characteristics of Their Host Stars
Beers, Timothy C.; Lee, Young Sun; Kim, Young Kwang +3 more
Chemical anomalies in planet-hosting stars (PHSs) are studied in order to assess how the planetary nature and multiplicity affect the atmospheric chemical abundances of their host stars. We employ APOGEE DR17 to select thin-disk stars of the Milky Way, and crossmatch them with the Kepler Input Catalog to identify confirmed PHSs, which results in 2…
ϵ Sagittarii: An Extreme Rapid Rotator with a Decretion Disk
Lewis, Fiona; Bailey, Jeremy; Cotton, Daniel V. +3 more
We report high-precision, multiwavelength linear-polarization observations of the bright B9 (or A0) star ϵ Sagittarii. The polarization shows the distinctive wavelength dependence expected for a rapidly rotating star. Analysis of the polarization data reveals an angular rotation rate ω (=Ω/Ωcrit) of 0.995 or greater, the highest yet mea…