Search Publications
Centimeter-sized Grains in the Compact Dust Ring around Very-low-mass Star CIDA 1
Dong, Ruobing; Liu, Hauyu Baobab; Hashimoto, Jun +3 more
We examined the grain size in the dust ring encircling the 0.19 M ☉ T Tauri star CIDA 1 using the Karl G. Jansky Very Large Array at multiple centimeter wavelengths, with a spatial resolution of 0.″2-0.″9. We detected distinct partial-ring structures at these wavelengths around CIDA 1. Based on spatial distributions and spectral indices…
A Catalog of Nearby Accelerating Star Candidates in Gaia DR3
Kenyon, Scott J.; Bromley, Benjamin C.; Whiting, Marc L. +1 more
We describe a new catalog of accelerating star candidates with Gaia G ≤ 17.5 mag and distances d ≤ 100 pc. Designated as the Gaia Nearby Accelerating Star Catalog (GNASC), it contains 29,684 members identified using a supervised machine-learning algorithm trained on the Hipparcos-Gaia Catalog of Accelerations (HGCA), Gaia Data Release 2, and Gaia …
Discovery of 20 UV-emitting SNRs in M31 with UVIT
Leahy, Denis; Monaghan, Christopher; Ranasinghe, Sujith
We present the first catalog of supernova remnants (SNRs) in M31 that exhibit diffuse ultraviolet (UV) emission. UV images of M31 were obtained by the Ultraviolet Imaging Telescope (UVIT) on the AstroSat satellite, and the list of SNRs was obtained from X-ray, optical, and radio catalogs of SNRs in M31. We used the UVIT images to find SNRs with di…
Understanding the Planetary Formation and Evolution in Star Clusters (UPiC). I. Evidence of Hot Giant Exoplanets Formation Timescales
Zhou, Ji-Lin; Dai, Yuan-Zhe; Liu, Hui-Gen +1 more
Planets in young star clusters could shed light on planet formation and evolution since star clusters can provide accurate age estimation. However, the number of transiting planets detected in clusters was only ~30, too small for statistical analysis. Thanks to the unprecedented high-precision astrometric data provided by Gaia DR2 and Gaia DR3, ma…
Atmospheric and Fundamental Parameters of the Individual Components of Multiple Stellar Systems
Al-Wardat, Mashhoor A.; Abu-Alrob, Enas M.; Hussein, Abdallah M.
We present detailed analyses of eight triple stellar systems (lying between 20 and 155 pc) and nine quadruple stellar systems (lying between 20 and 250 pc) with different configurations. Most of these systems are hierarchical. The systems are HIP 4239, HIP 5588, HIP 11072, HIP 12548, HIP 13498, HIP 17895, HIP 19915, HIP 22607, HIP 25240, HIP 28614…
Simultaneous Six-way Observations from the Navy Precision Optical Interferometer
van Belle, Gerard T.; Stone, Jordan M.; von Braun, Kaspar +7 more
We measured the angular diameters of six stars using the six-element observing mode of the Navy Precision Optical Interferometer (NPOI) for the first time since the early 2000s. Four of the diameters ranged from 1.2 to 1.9 mas, while the two others were much smaller at approximately 0.5 mas to 0.7 mas, which are the two smallest angular diameters …
Absolute Properties of the Oscillating Eclipsing Algol X Trianguli
Kim, Dong-Jin; Wolf, Marek; Hong, Kyeongsoo +2 more
We report results from the TESS photometric data and new high-resolution spectra of the Algol system X Tri showing short-period pulsations. From the echelle spectra, the radial velocities of the eclipsing pair were measured, and the rotational rate and effective temperature of the primary star were obtained to be v 1sini = 84 ± 6 km s
The Most Sensitive SETI Observations Toward Barnard's Star with FAST
Tao, Zhen-Zhao; Zhao, Hai-Chen; Zhang, Tong-Jie +4 more
Search for extraterrestrial intelligence (SETI) has been mainly focused on nearby stars and their planets in recent years. Barnard's star is the second closest star system to the Sun and the closest star in the Five-hundred-meter Aperture Spherical radio Telescope (FAST) observable sky which makes the minimum Equivalent Isotropic Radiated Power re…
CCD UBV and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605
Sarajedini, Ata; Bilir, Selçuk; Yontan, Talar +5 more
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the PYUPMASK algorithm on Gaia astrometric data to estimate cluster membership probabilities, we have identified 112 stars in King 6 and 160 stars in NGC 1605 as the statistically most…
Searching for Compact Object Candidates from LAMOST Time-domain Survey of Four K2 Plates
Liu, Jifeng; Gu, Wei-Min; Wang, Song +3 more
The time-domain (TD) surveys of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) yield high-cadence radial velocities, paving a new avenue to study binary systems including compact objects. In this work, we explore LAMOST TD spectroscopic data of four K2 plates and present a sample of six single-lined spectroscopic binaries t…