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An isotropic full-sky sample of optically selected blazars
Kudenko, Maria; Troitsky, Sergey
Context. Various high-energy phenomena in the Universe are associated with blazars, which are powerful active galaxies with jets pointing at the observer. Novel results relating blazars to high-energy neutrinos, cosmic rays, and even possible manifestations of new particle physics, often emerge from statistical analyses of blazar samples, and unif…
Photometric study of the overcontact binary NSVS2910034
Tobin, R. Wes; Berrington, Robert C.
We present BVRC+TESS differential photometry of an eclipsing binary system NSVS 2910034. A period analysis reveals unusual variations that are inconsistent with systemic orbital period changes and may be due to surface activity. The best fit models are consistent with a W-type W UMa overcontact binary, consisting of a less massive G7 spectral type…
OGLE-BLAP-001 and ZGP-BLAP-08: Two possible magnetic blue large-amplitude pulsators
Pigulski, Andrzej; Kołaczek-Szymański, Piotr A.; Święch, Marta +2 more
Blue large-amplitude pulsators (BLAPs) are a newly discovered group of compact pulsating stars whose origins are yet to be explained. Of the existing evolutionary scenarios that could lead to the formation of BLAPs, there are two positing that BLAPs are the products of the merger of two stars: either a main-sequence star and a helium white dwarf o…
Exploring faint white dwarfs and the luminosity function with Subaru HSC and SDSS in Stripe 82
Takada, Masahiro; Kashiyama, Kazumi; Yasuda, Naoki +4 more
We present 5080 white dwarf (WD) candidates selected from stars matching between the multiband imaging data sets of the Subaru Hyper Suprime-Cam (HSC) Survey and the Sloan Digital Sky Survey in the Stripe82 region covering about 165 deg
TOI-3568 b: A super-Neptune in the sub-Jovian desert
Moutou, C.; Carmona, A.; Donati, J. -F. +42 more
The sub-Jovian desert is a region in the mass-period and radius-period parameter space that typically encompasses short-period ranges between super-Earths and hot Jupiters, and exhibits an intrinsic dearth of planets. This scarcity is likely shaped by photoevaporation caused by the stellar irradiation received by giant planets that have migrated i…
Do All the Quasars and High-excitation Radio Galaxies (HERGs) in the 3CRR Catalog Contain a Magnetically Arrested Disk (MAD)?
Li, Shuang-Liang; Cao, Xinwu; Zuo, Wenwen
Based on the magnetization, an accretion disk with a large-scale magnetic field can be separated into either standard and normal evolution or magnetically arrested disk (MAD), which are difficult to identify from observations. It is still unclear whether all the radio-loud active galactic nuclei (RLAGNs) with a thin disk and strong radio emissions…
Spectroscopic evidence of a possible young stellar cluster at the Galactic Center
Najarro, F.; Nogueras-Lara, F.; Schödel, R. +3 more
Context. The nuclear stellar disk has been the most prolific star-forming region in the Milky Way over the past ∼30 million years. Notably, the cumulative mass of the three clusters currently found in the nuclear stellar disk, the Quintuplet, the Arches, and the Nuclear clusters, amounts to just 10% of the total anticipated mass of young stars tha…
A Massive White Dwarf or Low-mass Neutron Star Discovered by LAMOST
Liu, Jifeng; Wang, Song; Zhao, Xinlin +3 more
We report the discovery of a close binary J0606+2132 (Gaia DR3 3423365496448406272) with P obs = 2.77 days containing a possible massive white dwarf (WD) or a neutron star (NS) using LAMOST spectroscopic data. By a joint fitting of the radial velocity from LAMOST and the light curve from TESS, we derived a circular Keplerian orbit with …
A Search for Collisions and Planet–Disk Interactions in the Beta Pictoris Disk with 26 Years of High-precision HST/STIS Imaging
Stark, Christopher C.; Wagner, Kevin; Apai, Dániel +2 more
β Pictoris's well-studied debris disk and two known giant planets, in combination with the stability of the Hubble Space Telescope's Space Telescope Imaging Spectrograph (HST/STIS) (and now also JWST), offers a unique opportunity to test planet–disk interaction models and to observe recent planetesimal collisions. We present HST/STIS coronagraphic…
Finite Element Analysis of Electrostatic Coupling in LISA Pathfinder Inertial Sensors
Zhang, Wenyan; Lei, Jungang; Wang, Zuolei +4 more
In the LISA Pathfinder (LPF) mission, electrostatic noise can reach the femto-Newtonian level despite the fact that the LPF's sensors are equipped with potential shielding. Most of the existing simulation studies focus on the electrostatic edge effect and related fields, while the simulation study of the patch effect is neglected. For that reason,…