Search Publications
Detection of single-degenerate massive binaries with Gaia: The impact of blue supergiants, triples, mass precision, and high-precision parallax requirements
Shenar, T.; Sana, H.; Marchant, P. +1 more
Context. X-ray-quiet single-degenerate massive binaries are notoriously difficult to detect, and only a few have been identified so far. Yet, recent investigations have shown that hundreds of black holes (BHs) with massive main-sequence (MS) companions (OB+BHs) might be identifiable from Gaia astrometry by using the astrometric mass-ratio function…
The role of cooling induced by mixing in the mass and energy cycles of the solar atmosphere
Hillier, Andrew; Snow, Ben; Arregui, Iñigo
In many astrophysical systems, mixing between cool and hot temperature gas/plasma through Kelvin-Helmholtz-instability-driven turbulence leads to the formation of an intermediate temperature phase with increased radiative losses that drive efficient cooling. The solar atmosphere is a potential site for this process to occur with interaction betwee…
Detection of seven 2+2 doubly eclipsing quadruple systems
Merc, J.; Mašek, M.; Kučáková, H. +4 more
In this work, we study a heterogeneous group of seven stellar systems for the first time. Despite their different distances or spectral types, all of them belong to a very rare group of quadruple systems of 2+2 architecture, where both of the inner pairs harbor eclipsing binaries. These systems are: ASASSN-V J102911.57−522413.6 (inner periods 0.57…
Fundamental parameters for double-lined spectroscopic and detached eclipsing binary system J064726.39 + 223431.6
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +1 more
We present a study of the detached eclipsing binary J064726.39 + 223431.6 using spectra from the LAMOST medium-resolution spectra and Transiting Exoplanet Survey Satellite photometry. We use full-spectrum fitting to derive radial velocities and spectral parameters: ${T_{\rm eff}}_{A,B}=6177,\, 5820$ K, $V \sin {i}_{A,B}=59,\, 50~\, {\rm km}\, {\rm…
An SMA Survey of Chemistry in Disks Around Herbig AeBe Stars
Wilner, David J.; Andrews, Sean M.; Huang, Jane +6 more
Protoplanetary disks around Herbig AeBe stars are exciting targets for studying the chemical environments where giant planets form. Save for a few disks, however, much of Herbig AeBe disk chemistry is an open frontier. We present a Submillimeter Array ~213-268 GHz pilot survey of millimeter continuum CO isotopologs and other small molecules in dis…
Mapping NGC 7027 in New Light: CO+ and HCO+ Emission Reveal Its Photon- and X-Ray-dominated Regions
Wilner, David J.; Montez, Rodolfo; Kastner, Joel H. +7 more
The young and well-studied planetary nebula (PN) NGC 7027 harbors significant molecular gas that is irradiated by luminous, pointlike UV (central star) and diffuse (shocked nebular) X-ray emission. This nebula represents an excellent subject to investigate the molecular chemistry and physical conditions within photon- and X-ray-dominated regions (…
Gravitational collapse and accretion flows in the hub filament system G323.46-0.08
Li, Dalei; Tang, Xindi; Zhou, Jianjun +9 more
We studied the hub-filament system G323.46-0.08 based on archival molecular line data from the SEDIGISM 13CO survey and infrared data from the GLIMPSE, MIPS, and Hi-GAL surveys. G323.46-0.08 consists of three filaments, F-north, F-west, and F-south, that converge toward the central high-mass clump AGAL 323.459-0.079. F-west and Part1 of…
Radio transients and variables in the tenth Deeper, Wider, Faster observing run
Möller, A.; Abbott, T. M. C.; Zhang, J. +23 more
The Deeper, Wider, Faster (DWF) program coordinates observations with telescopes across the electromagnetic spectrum, searching for transients on time-scales of milliseconds to days. The tenth DWF observing run was carried out in near real-time during September 2021, and consisted of six consecutive days of observations of the NGC 6744 galaxy grou…
Exploring the origin of the extended main-sequence turn-off in M37 through the white dwarf cooling sequence
Salaris, M.; Anderson, J.; Bedin, L. R. +3 more
We use new observations from the Canada-France-Hawaii Telescope to study the white dwarf cooling sequence of the open cluster M37, a cluster that displays an extended main-sequence turn-off and, according to a recent photometric analysis, also a spread of initial chemical composition. By taking advantage of a first epoch collected in 1999 with the…
The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts
Esposito, Paolo; Auchettl, Katie; Vasilopoulos, Georgios +8 more
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable phenomena in the 0.3-10 keV energy band. We include gamma-ray burst afterglows, supernovae, superno…