Search Publications
Missions
Journals
Publication Years
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 …
High-throughput quantum chemistry: empowering the search for molecular candidates behind unknown spectral signatures in exoplanetary atmospheres
McKemmish, Laura K.; Pettyjohn, Maria M.; Zapata Trujillo, Juan C.
The identification of molecules in exoplanetary atmospheres is only possible thanks to the availability of high-resolution molecular spectroscopic data. However, due to its intensive and time-consuming generation process, at present, only 100 molecules have high-resolution spectroscopic data available, limiting new molecular detections. Using rout…
Ups!... I did it again: unveiling the hidden companion in Upsilon Sagittarii, a unique binary system at a second mass transfer stage
Shenar, Tomer; Gilkis, Avishai
Upsilon Sagittarii is a hydrogen-deficient binary that has been suggested to be in its second stage of mass transfer, after the primary has expanded to become a helium supergiant following core helium exhaustion. A tentative identification of the faint companion in the ultraviolet led to mass estimates of both components that made the helium star …
Chemical Differentiation around Five Massive Protostars Revealed by ALMA: Carbon-chain Species and Oxygen/Nitrogen-bearing Complex Organic Molecules
Caselli, Paola; Nakamura, Fumitaka; Li, Zhi-Yun +9 more
We present Atacama Large Millimeter/submillimeter Array Band 3 data toward five massive young stellar objects (MYSOs), and investigate relationships between unsaturated carbon-chain species and saturated complex organic molecules (COMs). An HC5N (J = 35-34) line has been detected from three MYSOs, where nitrogen (N)-bearing COMs (CH