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Evidence for Parametric Decay Instability in the Lower Solar Atmosphere
Hahn, Michael; Fu, Xiangrong; Savin, Daniel Wolf
We find evidence for the first observation of the parametric decay instability (PDI) in the lower solar atmosphere. In particular, we find that the power spectrum of density fluctuations near the solar transition region resembles the power spectrum of the velocity fluctuations but with the frequency axis scaled up by about a factor of 2. These res…
Analysis of multiscale structures at the quasi-perpendicular Venus bow shock. Results from Solar Orbiter's first Venus flyby
Maksimovic, M.; Bale, S. D.; Chust, T. +23 more
Context. Solar Orbiter is a European Space Agency mission with a suite of in situ and remote sensing instruments to investigate the physical processes across the inner heliosphere. During the mission, the spacecraft is expected to perform multiple Venus gravity assist maneuvers while providing measurements of the Venusian plasma environment. The f…
Seimei KOOLS-IFU mapping of the gas and dust distributions in Galactic planetary nebulae: the case of IC 2165
Otsuka, Masaaki
We investigated the physical and chemical properties of the gas and dust components in a carbon-rich planetary nebula (PN) IC 2165 using two-dimensional emission-line maps with superior resolution. The extinction map is generated in a self-consistent and assumption-free manner. The circumstellar gas-to-dust mass ratio (GDR) map ranges radially fro…
Around the Spindle Galaxy: The Dark Halo Mass of NGC 3115
Karachentsev, I. D.; Anand, G. S.; Makarova, L. N. +1 more
We report observations of five dwarf galaxies in the vicinity of the luminous S0 galaxy NGC 3115 performed with the Advanced Camera for Surveys on the Hubble Space Telescope. Their distances determined via the Tip of the Red Giant Branch are: 10.05 Mpc (UGCA 193), 9.95 Mpc (KKSG 17), 10.13 Mpc (2MASX-J0957-0915), 10.42 Mpc (2dFGRS-TGN218Z179), and…
Searching for the next Galactic Luminous red nova
Jones, David; Blagorodnova, Nadejda; Erasmus, Nicolas +3 more
Luminous red novae (LRNe) are astrophysical transients believed to be caused by the partial ejection of a binary star's common envelope (CE) and the merger of its components. The formation of the CE is likely to occur during unstable mass transfer, initiated by a primary star which is evolving off the main sequence (a Hertzsprung gap star) and a l…
Recurrent X-ray flares of the black hole candidate in the globular cluster RZ 2109 in NGC 4472
Lodato, G.; Salvaterra, R.; Tiengo, A. +7 more
We report the systematic analysis of the X-ray observations of the ultraluminous X-ray source
Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
Kovács, J.; Claret, A.; Kundra, E. +4 more
Rapidly rotating early-type main-sequence stars with transiting planets are interesting in many aspects. Unfortunately, several astrophysical effects in such systems are not well understood yet. Therefore, we performed a photometric mini-survey of three rapidly rotating stars with transiting planets, namely KELT-17b, KELT-19Ab, and KELT-21b, using…
Stars in the local galactic thick disc and halo in Gaia EDR3: a catalogue of half a million local main-sequence stars with photometric metallicities
Kim, Bokyoung; Lépine, Sebastien
We present a catalogue of 551 214 main-sequence stars in the local (d < 2 kpc) Galactic thick disc and halo, based on a search of stars with large proper motions ($\mu _{\rm tot} \gt 40.0~\rm mas\, yr^{-1}$) in the Gaia Early Data Release 3. We derive photometric metallicity calibrated from the colour-luminosity-metallicity distribution of 20 0…
FSR 1776: A new globular cluster in the Galactic bulge?
Minniti, D.; Saito, R. K.; Fernández-Trincado, J. G. +6 more
Context. Recent near-IR surveys have uncovered a plethora of new globular cluster (GC) candidates towards the Milky Way bulge. These new candidates need to be confirmed as real GCs and properly characterised.
Aims: We investigate the physical nature of FSR 1776, a very interesting star cluster projected towards the Galactic bulge. This object…
Interstellar objects
Moro-Martín, Amaya; Seligman, Darryl Z.
Since 2017, two macroscopic interstellar objects have been discovered in the inner Solar System, both of which are distinct in nature. The first interstellar object, 1I/`Oumuamua, passed within $\sim63$ lunar distances of the Earth, appeared asteroidal lacking detectable levels of gas or dust loss, yet exhibited a nongravitational acceleration. 1I…