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Photometric Distance of the RR Lyrae Star SU Draconis using Period-Luminosity-Metallicity Relationships
Davis, J.; Baltich, B.; Siaw, K. +2 more
The distance to the RR Lyrae Star SU Draconis was estimated via photometric analysis using period-luminosity-metallicity equations from Cáceres and Catelan, as well as Garofalo's luminosity-metallicity equation. Exposures were taken in the B, V, i, and z bands over a two-week period (65 exposures per band). Photometry files from the cadence were a…
ZTF J185259.31+124955.2: A new evolved disc-eclipsing binary system
Bernhard, Klaus; Lloyd, Christopher
Discs in long-period eclipsing binary systems are rare and can lead to extraordinary eclipsing events. ZTF J185259.31+124955.2 was identified as a candidate disc-eclipsing system through a continuing search programme of ZTF variables with a near-IR excess in the WISE data. Examination of the combined ZTF and ATLAS photometry shows seven eclipses s…
An Outflow-driven Water Maser Associated with Positive Black Hole Feedback in the Dwarf Galaxy Henize 2–10
Darling, Jeremy; Reines, Amy E.; Momjian, Emmanuel +1 more
Henize 2–10 is a dwarf galaxy experiencing positive black hole (BH) feedback from a radio-detected low-luminosity active galactic nucleus. Previous Green Bank Telescope (GBT) observations detected a H2O "kilomaser" in Henize 2–10, but the low angular resolution (33″) left the location and origin of the maser ambiguous. We present new Ka…
Evidence of Kelvin-Helmholtz and tearing mode instabilities at the magnetopause during space weather events
Jerse, Giovanna; Marcucci, Maria Federica; Laurenza, Monica +9 more
Introduction: Kelvin-Helmholtz (KH) and tearing mode (TM) instabilities are one of the most important mechanisms of solar wind energy, momentum and plasma transport within the magnetosphere.Methods: To investigate the conditions under which KHTM instabilities occur in the Earth environment it is fundamental to combine simultaneous multipoint in si…
A Possible X-ray Quasi-periodic Oscillation in the Narrow-line Seyfert 1 Galaxy Mrk 142
Zhong, Xiao-Gu; Wang, Jian-Cheng; Chen, Yong-Yun +1 more
A possible quasi-periodic oscillation (QPO) at frequency 7.045 × 10‑5 Hz is found in the narrow-line Seyfert 1 galaxy Mrk 142 in the data of XMM-Newton collected on 2020 April 11. We find that the QPO signal is statistically significantly larger than the 5σ level and highly coherent with quality factor Q > 5 at the 0.3–10 keV band by…
New Results of Radiation Study on Board TGO ExoMars in 2018–2023
Mitrofanov, I.; Golovin, D.; Kozyrev, A. +13 more
The article provides a brief description of the Liulin-MO dosimeter, which is part of the FREND (Fine Resolution Epithermal Neutron Detector) device installed on the TGO (Trace Gas Orbiter) spacecraft of the ExoMars-2016 mission. Since April 2018, TGO has been operating in orbit around Mars. Data are presented on the radiation environment in the o…
X-Ray, UV, and Optical Observations of Proxima Centauri's Stellar Cycle
Slavin, Jonathan D.; do Nascimento, José-Dias; Saar, Steven H. +3 more
Proxima Cen (GJ 551; dM5.5e) is one of only about a dozen fully convective stars known to have a stellar cycle, and the only one to have long-term X-ray monitoring. A previous analysis found that X-ray and mid-UV observations, particularly two epochs of data from Swift, were consistent with a well-sampled ∼7 yr optical cycle seen in All Sky Automa…
A survey for variable young stars with small telescopes - IX. Evolution of spot properties on YSOs in IC 5070
Scholz, Aleks; Eislöffel, Jochen; Dvorak, Shawn +45 more
We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, ~5 yr, light curves in the V, R, and I-bands are obtained through the HOYS (Hunting Outbursting Young Stars) citizen science project. These are dissected into 6 months long slices, with 3 months oversampling, to measure 234 sets of amplitudes in all filters. We …
The first low-mass eclipsing binary within the fully convective zone from TMTS
Kovalev, Mikhail; Zhu, Liying; Wang, Xiaofeng +17 more
We present a comprehensive photometric and spectroscopic analysis of the short-period (~5.32 h) and low-mass eclipsing binary TMTSJ0803 discovered by Tsinghua-Ma Huateng Telescope for Survey (TMTS). By fitting the light curves and radial velocity data with the Wilson-Devinney code, we find that the binary is composed of two late spotted active M d…
A Very-High-Energy Gamma-Ray View of the Transient Sky
Carosi, Alessandro; López-Oramas, Alicia
The development of the latest generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) over recent decades has led to the discovery of new extreme astrophysical phenomena in the very-high-energy (VHE, E > 100 GeV) gamma-ray regime. Time-domain and multi-messenger astronomy are inevitably connected to the physics of transient VHE emitters,…