Search Publications
Tracing the Giant Outer Halo of the Mysterious Massive Disk Galaxy M104. I. Photometry of the Extended Globular Cluster Systems
Park, Byeong-Gon; Hwang, Narae; Lee, Myung Gyoon +4 more
M104 (NGC 4594, the Sombrero galaxy) is a mysterious massive early-type galaxy that shows a dominant bulge and a prominent disk. However, the presence of a halo in M104 has been elusive, and it is not yet known how M104 has acquired such a peculiar structure. Using wide (~2 deg2) and deep ugi images of M104 obtained with the CFHT/MegaCa…
An Imaging Search for Post-main-sequence Planets of Sirius B
Lucas, Miles; Ruane, Garreth; Bottom, Michael +1 more
We present deep imaging of Sirius B, the closest and brightest white dwarf, to constrain post-main-sequence planetary evolution in the Sirius system. We use Keck/NIRC2 in L' band (3.776 µm) across three epochs in 2020 using the technique of angular differential imaging. Our observations are speckle-limited out to 1 au and background-limited …
A Volumetric Study of Flux Transfer Events at the Dayside Magnetopause
Strugarek, Antoine; Vaidya, Bhargav; Paul, Arghyadeep
Localized magnetic reconnection at the dayside magnetopause leads to the production of Flux Transfer Events (FTEs). The magnetic fields within the FTEs exhibit complex helical flux-rope topologies. Leveraging the adaptive mesh refinement strategy, we perform a three-dimensional magnetohydrodynamic simulation of the magnetosphere of an Earth-like p…
Photometric and Spectroscopic Studies of the Long-Period Low-Mass-Ratio Deep-Contact Binary KN Per
Wang, Xi; Guo, Ya-Ni; Li, Kai +6 more
Photometric analysis and spectroscopic study of the long-period low-mass-ratio deep-contact binary KN Per were performed. The light curves of the BV(RI) c band were from the Ningbo Bureau of Education and Xinjiang Observatory Telescope at the Xingming Observatory. Through the analysis of the Wilson-Devinney program, KN Per was found as…
Astrometric Precision Tests on TESS Data
Lattanzi, M.; Busonero, D.; Bucciarelli, B. +5 more
Astrometry at or below the microarcsec level with an imaging telescope assumes that the uncertainty on the location of an unresolved source can be an arbitrarily small fraction of the detector pixel, given a sufficient photon budget. This paper investigates the geometric limiting precision, in terms of CCD pixel fraction, achieved by a large set o…
The Mysterious Radcliffe Wave
Bobylev, V. V.; Bajkova, A. T.; Mishurov, Yu. N.
This survey is devoted to the Radcliffe Wave discovered recently by Alves et al., from an analysis of the position of molecular clouds. These authors identified a narrow chain of molecular clouds, extended essentially in one line at an angle of about 30° to the galactic axis y. Essentially, the Radcliffe Wave outlines the damped oscillations in th…
Parameterization of long-period eclipsing binaries
Malkov, Oleg; Kniazev, Alexei; Berdnikov, Leonid +2 more
One of the important sources for independent determination of stellar masses is eclipsing binaries with components on the main sequence, and with observable spectral lines of both components. The parameters of such stars are used to construct the mass-luminosity relation for stars of high and intermediate masses. Among them, the type of long-perio…
Investigating variations in the dust emissivity index in the Andromeda Galaxy
Smith, M. W. L.; Eales, S. A.; Marsh, K. A. +3 more
Over the past decade, studies of dust in the Andromeda Galaxy (M31) have shown radial variations in the dust emissivity index (β). Understanding the astrophysical reasons behind these radial variations may give clues about the chemical composition of dust grains, their physical structure, and the evolution of dust. We use 12CO(J = 1$\lo…
Substructure at High Speed. I. Inferring the Escape Velocity in the Presence of Kinematic Substructure
Necib, Lina; Lin, Tongyan
The local escape velocity provides valuable inputs to the mass profile of the galaxy, and requires understanding the tail of the stellar speed distribution. Following Leonard & Tremaine, various works have since modeled the tail of the stellar speed distribution as $\propto {({v}_{\mathrm{esc}}-v)}^{k}$ , where v esc is the escape v…
Double peak quasi-periodic pulsations in a circular-ribbon flare
Altyntsev, A. T.; Meshalkina, N. S.; Sych, R. A. +1 more
We study quasi-periodic pulsations (QPPs) during the impulsive phase of the C8.3 flare SOL2002-08-06T01:43. The shape of an extended 5.7 GHz source is similar to a tadpole with the head located above the region of a negative magnetic polarity, surrounded by positive polarity patches and with a remote tail source. The flare configuration includes b…