Search Publications
The miniJPAS and J-NEP surveys: Identification and characterization of the Lyα emitter population and the Lyα luminosity function at redshift 2.05 < z < 3.75
Hernán-Caballero, A.; Mendes de Oliveira, C.; Vázquez Ramió, H. +27 more
We present the Lyman-α (Lyα) luminosity function (LF) at 2.05 < z < 3.75, estimated from a sample of 67 Lyα-emitter (LAE) candidates in the Javalambre Physics of the Accelerating Universe Astronomical Survey (J-PAS) pathfinder surveys: miniJPAS and J-NEP. These two surveys cover a total effective area of ∼1.14 deg2 with 54 narrow …
Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO). II. t-SNE portrait of local fossil relics and structures
Beers, Timothy C.; Minniti, Dante; Chiappini, Cristina +7 more
Based on high-quality Apache Point Observatory Galactic Evolution Experiment (APOGEE) DR17 and Gaia DR3 data for 1742 red giants stars within 5 kpc of the Sun and not rotating with the Galactic disk (Vϕ < 100 km s−1), we used the nonlinear technique of unsupervised analysis t-Distributed Stochastic Neighbor Embedding (t-SN…
Cross-Scale Processes of Magnetic Reconnection
Eastwood, J. P.; Lavraud, B.; Hasegawa, H. +8 more
Various physical processes in association with magnetic reconnection occur over multiple scales from the microscopic to macroscopic scale lengths. This paper reviews multi-scale and cross-scale aspects of magnetic reconnection revealed in the near-Earth space beyond the general global-scale features and magnetospheric circulation organized by the …
X-Ray, Near-ultraviolet, and Optical Flares Produced by Colliding Magnetospheres in the Young High-eccentricity Binary DQ Tau
Kóspál, Ágnes; Arulanantham, Nicole; Getman, Konstantin V. +3 more
DQ Tau is a unique young high-eccentricity binary system that exhibits regular magnetic reconnection flares and pulsed accretion near periastron. We conducted NuSTAR, Swift, and Chandra observations during the 2022 July 30 periastron to characterize X-ray, near-ultraviolet (NUV), and optical flaring emissions. Our findings confirm the presence of …
Asteroseismology of PG 1541 + 651 and BPM 31594 with TESS
Kepler, S. O.; Hermes, J. J.; Bell, Keaton J. +5 more
We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541 + 651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based facilities, with three and one period detected, respectively. The TESS data allowed the detection of multiple periodicities, 12 for PG 1541 + 651, and six for BPM 3159…
A helium-burning white dwarf binary as a supersoft X-ray source
Burgess, J. M.; Werner, K.; Haberl, F. +12 more
Type Ia supernovae are cosmic distance indicators1,2, and the main source of iron in the Universe3,4, but their formation paths are still debated. Several dozen supersoft X-ray sources, in which a white dwarf accretes hydrogen-rich matter from a non-degenerate donor star, have been observed5 and suggested as Type I…
All Spectral Type LAMOST Spectra Library (ATLAS)
Tian, Hao; Li, Jiadong; Deng, Licai +4 more
We present an empirical stellar spectra library, ATLAS, with resolution R ~ 1800 and wavelength coverage from 3800-8700 Å. These spectra are homogeneously observed by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope and have been released in its DR5. ATLAS is separated into two groups, ATLAS-A and -T. The former contains 5584 spectra …
An extreme-ultraviolet wave associated with the possible expansion of sheared arcades
Yang, Shuhong; Zhang, Liang; Chen, Yao +4 more
Context. Solar extreme-ultraviolet (EUV) waves are propagating disturbances in the corona, and they are usually accompanied with various solar eruptions, from large-scale coronal mass ejections to small-scale coronal jets.
Aims: Generally, it is believed that EUV waves are driven by the rapid expansion of coronal loops overlying the erupting …
Study of the open clusters in Kepler prime field
Akkaya Oralhan, İnci; Netopil, Martin; Çakmak, Hikmet +3 more
We present a detailed study of NGC 6791, NGC 6811, NGC 6819, and NGC 6866, the four open clusters that are located in the Kepler prime field. We use new CCD UBV(RI)KC photometry, which was combined with Gaia EDR3 photometric/astrometric data, to derive the astrophysical parameters with two-independent methods - one of them the fitCMD al…
Turbulence Properties of Interplanetary Coronal Mass Ejections in the Inner Heliosphere: Dependence on Proton Beta and Flux Rope Structure
Möstl, C.; Kilpua, E. K. J.; Chen, C. H. K. +3 more
Interplanetary coronal mass ejections (ICMEs) have low proton beta across a broad range of heliocentric distances and a magnetic flux rope structure at large scales, making them a unique environment for studying solar wind fluctuations. Power spectra of magnetic field fluctuations in 28 ICMEs observed between 0.25 and 0.95 au by Solar Orbiter and …