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Zonal and Regional Jupiter Brightness Trends from the Hubble Outer Planet Atmospheres Legacy Program
Wong, Michael H.; Simon, Amy A.
The Hubble Outer Planet Atmospheres Legacy program began in 2014 and has observed Jupiter yearly from 2015 to 2024. Using high spatial resolution imaging from the Hubble Wide Field Camera 3, brightness trends were investigated focusing on the unique UV capability and absolute calibration consistency of the Hubble Space Telescope. From these data, …
Modeling the Wavelength Dependence of Pixel Response Nonuniformity of a CCD Sensor
Meng, Xianmin; Du, Wei; Zhan, Hu +2 more
Precision measurements in astronomy require stringent control of systematics such as those arising from imperfect correction of sensor effects. In this work, we develop a parametric method to model the wavelength dependence of pixel response nonuniformity (PRNU) for a laser-annealed backside-illuminated charge-coupled device. The model accurately …
Meridional Circulations of the Solar Magnetic Fields of Different Strength
Bilenko, Irina A.
The meridional circulation of the solar magnetic fields in Solar Cycles 21 – 24 was considered. Data from both ground-based and space observatories were used. Three types of time–latitude distributions of photospheric magnetic fields and their meridional circulations were identified depending on the magnetic-field intensity. (i) Low-strength magne…
The Role of Ice and Latitude-Dependent Mantling on Boulder Distributions Across the Martian Northern Lowlands
Ewing, R. C.; Karunatillake, S.; Cohen-Zada, A. L. +1 more
Boulders are ubiquitous on rocky planets and provide valuable information about planetary processes. The abundance, size, and distribution of boulders offer insights into the primary processes that form them and the secondary processes that modify their position and size. However, the roles of varying environmental processes, including cryospheric…
Caught in flagrante delicto: Evidence for past mass transfer in massive binaries?
Rauw, G.
Many massive binary systems undergo mass and angular momentum transfer over the course of their evolution. This kind of interaction is expected to deeply affect the properties of the mass donor and mass gainer and to leave various observational signatures. The most common smoking guns of a past mass transfer episode are notably rapid rotation of t…
Exploring the nature of an ultraluminous X-ray source in NGC 628
Avdan, S.; Avdan, H.
Aims. In this work, we study the X-ray spectral and temporal properties of an ultraluminous X-ray source (ULX) in NGC 628 by using multi-epoch archival X-ray data. The physical parameters were estimated in each epoch in order to constrain the nature of the compact object in the system. Also, the optical counterpart candidates of the ULX were exami…
Orbital architectures of planet-hosting binaries - III. Testing mutual inclinations of stellar and planetary orbits in triple-star systems
Huber, Daniel; Dupuy, Trent J.; Ireland, Michael J. +7 more
Transiting planets in multiple-star systems, especially high-order multiples, make up a small fraction of the known planet population but provide unique opportunities to study the environments in which planets would have formed. Planet-hosting binaries have been shown to have an abundance of systems in which the stellar orbit aligns with the orbit…
Steps toward Unraveling the Structure and Formation of Five Polar Ring Galaxies
Kulkarni, Varsha P.; Aller, Monique C.; Lackey, Kyle E.
Polar ring galaxies (PRGs) are unusual relative to common galaxies in that they consist of a central host galaxy—usually a gas-poor, early-type S0 or elliptical galaxy—surrounded by a ring of gas, dust and stars that orbit perpendicular to the major axis of the host. Despite the general quiescence of early-type galaxies (ETGs) and the rings' lack …
An Investigation of six contact binary systems and a semi-detached one
Popov, Velimir; Acerbi, Francesco; Barani, Carlo +1 more
We present a photometric analysis of six W Ursae Majoris contact binaries and one semi-detached system using multifilter CCD observations. The data were obtained with the 0.25 m Schmidt Cassegrain telescope at the observatory Stazione Astronomica Betelgeuse (SAB) in Magnago, Italy, and the 30-cm Ritchey Chretien Astrograph at the IRIDA observatory…
LEAVES: An Expandable Light-curve Data Set for Automatic Classification of Variable Stars
Chen, Xiaodian; Fei, Ya; Yu, Ce +6 more
With the increasing amount of astronomical observation data, it is an inevitable trend to use artificial intelligence methods for automatic analysis and identification of light curves for full samples. However, data sets covering all known classes of variable stars that meet all research needs are not yet available. There is still a lack of standa…