Search Publications
Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS
Knutson, Heather; Li, Yaguang; Lee, Chien-Hsiu +76 more
Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales (
Charting the Lyman-α escape fraction in the range 2.9 < z < 6.7 and consequences for the LAE reionisation contribution
Laporte, N.; Nanayakkara, T.; Pello, R. +5 more
Context. The escape of Lyman-α photons at redshifts greater than two is an ongoing subject of study and an important quantity to further understanding of Lyman-α emitters (LAEs), the transmission of Lyman-α photons through the interstellar medium and intergalactic medium, and the impact these LAEs have on cosmic reionisation. Aims. This study aims…
Differential reddening in 48 globular clusters: An end to the quest for the intracluster medium
Bianchi, S.; Hunt, L. K.; Rainer, M. +9 more
For decades, it has been theorized that a tenuous but detectable intracluster medium should be present in globular clusters, which is continuously replenished by the gas and dust ejected by bright giants and periodically cleared by interactions with the Galactic disk. However, dedicated searches, especially in infrared and radio wavelengths, have …
Sky location of Galactic white dwarf binaries in space-based gravitational wave detection
Guo, Pan; Jin, Hong-Bo; Qiao, Cong-Feng +1 more
Quickly localizing the identified white dwarf (WD) binaries is the basic requirement for the space-based gravitational wave (GW) detection. In fact, the amplitude of GW signals are modulated by the periodic motion of GW detectors on the solar orbit. The intensity of the observed signals is enhanced according to the observation time beyond a year t…
The Metallicities of Five Small High-velocity Clouds
Richter, Philipp; Lockman, Felix J.; Fox, Andrew J. +5 more
High-velocity clouds (HVCs) are multiphase gas structures whose velocities (∣v LSR∣ ≥ 100 km s-1) are too high to be explained by Galactic disk rotation. While large HVCs are well characterized, compact and small HVCs (with H I angular sizes of a few degrees) are poorly understood. Possible origins for such small clouds inclu…
Modeling the spectral energy distribution of starburst galaxies. The role of photodissociation regions
Buat, V.; Boquien, M.; Burgarella, D. +3 more
Context. Analyzing multiwavelength observations of galaxies from the far-ultraviolet to the millimeter domains provides a wealth of information on the physical properties of galaxies and their evolution across cosmic time. Existing or upcoming ground-based or space-borne facilities with enhanced sensitivities and resolutions open an unprecedented …
Molecular clouds as hubs in spiral galaxies: gas inflow and evolutionary sequence
Davis, Timothy A.; Dib, Sami; Zhou, J. W.
We decomposed the molecular gas in the spiral galaxy NGC 628 (M74) into multiscale hub-filament structures using the CO (2
Star-by-star dynamical evolution of the physical pair of the Collinder 135 and UBC 7 open clusters
Berczik, Peter; Just, Andreas; Kovaleva, Dana A. +8 more
Context. In a previous paper using Gaia DR2 data, we demonstrated that the two closely situated open clusters Collinder 135 and UBC 7 might have formed together about 50 Myr ago.
Aims: In this work, we performed star-by-star dynamical modelling of the evolution of the open clusters Collinder 135 and UBC 7 from their supposed initial state to …
Optical Transient Source AT2021lfa: A Possible "Dirty Fireball"
Jin, Zhi-Ping; Wei, Da-Ming; Ye, Xue-Mei +1 more
AT2021lfa, also known as ZTF21aayokph, was detected by the Zwicky Transient Facility on 2021 May 4, at 05:34:48 UTC. Follow-up observations were conducted using a range of ground-based optical telescopes, as well as Swift/XRT and VLA instruments. AT2021lfa is classified as an "orphan afterglow" candidate due to its rapid flux decline and its redde…
Axial Flux Evolution of Small-scale Magnetic Flux Ropes from 0.06 to 10 au
Wang, Haimin; Kim, Hyomin; Lee, Jeongwoo +2 more
Small-scale magnetic flux ropes (SMFRs) fill much of the solar wind, but their origin and evolution are debated. We apply our recently developed, improved Grad–Shafranov algorithm for the detection and reconstruction of SMFRs to data from Parker Solar Probe, Solar Orbiter, Wind, and Voyager 1 and 2 to detect events from 0.06 to 10 au. We observe t…