Search Publications
An Episode of Occultation Events in Gaia21bcv
Gaidos, Eric; Shappee, Benjamin J.; Kenworthy, Matthew A. +4 more
A previously unremarkable star near the Canis Major OB1/R1 association underwent an episode of multiple deep brightness minima. Light curves based on archival Gaia, Zwicky Transient Facility (ZTF), and NEOWISE data and additional observations from the Las Cumbres Observatory and UKIRT show that the star was not variable prior to 2019 August 18 (MJ…
Boron Abundances in Early B Dwarfs of the Galactic Open Cluster NGC 3293
Cunha, Katia; Langer, Norbert; Proffitt, Charles R. +4 more
New boron abundances or upper limits have been determined for eight early B stars in the young Galactic open cluster NGC 3293, using UV spectra obtained by the Hubble Space Telescope Cosmic Origins Spectrograph. With previous observations, there are now 18 early B stars in this cluster with boron measurements. Six of the newly observed stars have …
Asteroseismology of One of the Most Rapidly Rotating DBV Stars: EPIC 248705247
Su, Jie; Cang, Tianqi; Fu, Jianning +4 more
We present a comprehensive analysis of oscillations of the helium-rich white dwarf DBV star EPIC 248705247 (SDSS J102106.69+082724.8). We extract the light curves from 79.7 days of K2 Campaign 14 data and identify 21 independent frequencies, including three complete and three incomplete dipole modes, with an average frequency splitting of 20.37 ± …
Direct Observations of a Shock Traversing Preceding Two Coronal Mass Ejections: Insights from Solar Orbiter, Wind, and STEREO Observations
Zhang, Zhiyong; Wang, Yuming; Shen, Chenglong +8 more
The three successive coronal mass ejections (CMEs) that erupted from 2023 November 27–28, provide the first opportunity to shed light on the entire process of a shock propagating through, sequentially compressing, and modifying two preceding CMEs using in situ data from Solar Orbiter, Wind, and STEREO-A. We describe the interaction of the three CM…
Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS
Ehrenreich, D.; Wheatley, P. J.; Nealon, R. +10 more
We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO's 3.6-m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously reported misaligned retrograde orbit using the Rossiter-McLaughlin effect. Additionally, we undertook a combined …
Orbit of the visual binary star 61 Cyg
Izmailov, I. S.; Apetyan, A. A.
We present the orbit and the mass estimates for the components of the visual binary star 61 Cyg obtained with the positional observations, including the high-precision Gaia data, and the measurements of differences in the radial velocities and the radial accelerations of the components. Since the orbital period of this star significantly exceeds t…
Precise Mass, Orbital Motion, and Stellar Properties of the M-dwarf Binary LP 349‑25AB
Curiel, Salvador; Ortiz-León, Gisela N.; Mioduszewski, Amy J. +1 more
LP 349‑25 is a well-studied close stellar binary system comprised of two late M dwarf stars, where both stars are close to the limit between star and brown dwarf. This system was previously identified as a source of gigahertz radio emission. We observed LP 349‑25AB over 11 epochs in 2020–2022, detecting both components in this nearby binary system…
Temporally Resolved Type III Solar Radio Bursts in the Frequency Range 3–13 MHz
Maksimovic, Milan; Kontar, Eduard P.; Chrysaphi, Nicolina +2 more
Radio observations from space allow to characterize solar radio bursts below the ionospheric cutoff, which are otherwise inaccessible, but suffer from low, insufficient temporal resolution. In this Letter we present novel, high-temporal resolution observations of type III solar radio bursts in the range 3–13 MHz. A dedicated configuration of the R…
The MDW Hα Sky Survey: Data Release 0
Walker, Gary; Sliski, David H.; Schiminovich, David +9 more
The Mittelman–di Cicco–Walker (MDW) Hα Sky Survey is an autonomously operated and ongoing all-sky imaging survey in the narrowband Hα wavelength. The survey was founded by amateur astronomers and is presented here in its first stage of refinement for rigorous scientific use. Each field is exposed through an Hα filter with a 3 nm bandwidth for a to…
Investigating 56 High Galactic Latitude Open Cluster Candidates in Gaia DR3
Chen, Jing; Zhang, Su; Wu, You +4 more
Using Gaia DR3 data, we revisit 56 high Galactic latitude (∣b∣ ≥ 30°) open cluster (OC) candidates with poor shapes of color–magnitude diagrams (CMDs), including unclear and paired main sequences (MSs). We aim to confirm their physical reality and explore whether the special MS morphology is intrinsic to genuine OCs. Initially, we redetermine clus…