Search Publications
Progenitor Constraint-incorporating Shell Merger: The Case of Supernova Remnant G359.0–0.9
Sato, Toshiki; Uchida, Hiroyuki; Tsuru, Takeshi Go +5 more
It is generally hard to put robust constraints on progenitor masses of supernovae and supernova remnants (SNRs) observationally, while they offer tantalizing clues to understanding explosion mechanisms and mass distribution. Our recent study suggests that "shell merger," which is theoretically expected for stellar evolution, can appreciably affect…
Origin of extended main-sequence turn-off in open cluster NGC 2355
Zhang, Yu; Samal, M. R.; Amard, Louis +5 more
The presence of extended Main-Sequence Turn-Off (eMSTO) in the open clusters has been attributed to various factors, such as spread in rotation rates, binary stars, and dust-like extinction from stellar excretion discs. We present a comprehensive analysis of the eMSTO in the open cluster NGC 2355. Using spectra from the Gaia-European Southern Obse…
Kink-and-Disconnection Failed Eruption in 3D
Chen, Wei; Gan, Weiqun; Mrozek, Tomasz +4 more
We present a case study of a failed eruption that accompanied an M1.5 GOES class solar flare. It was observed by STIX onboard Solar Orbiter, HXI onboard the Advanced Space-based Solar Observatory, AIA onboard Solar Dynamics Observatory, and WAVES onboard the STEREO-A. The important input is from stereoscopic hard X-ray (HXR) observations obtained …
Source of the Fe Kα emission in T Tauri stars. Radiation induced by relativistic electrons during flares. An application to RY Tau
Gómez de Castro, Ana I.; Carlos Vallejo, Juan; Antonicci, Anna
Context. T Tauri stars (TTSs) are magnetically active stars that accrete matter from the inner border of the surrounding accretion disk; plasma becomes trapped into the large-scale magnetic structures and falls onto the star, heating the surface through the so-called accretion shocks. The X-ray spectra of the TTSs show prominent Fe Kα fluorescence…
Star Formation, Nebulae, and Active Galactic Nuclei in CLASH Brightest Cluster Galaxies. I. Dependence on Core Entropy of Intracluster Medium
Donahue, Megan; Ohyama, Youichi; Lim, Jeremy +2 more
We set the stage for reassessing how star formation, emission-line nebulae, and active galactic nuclei (AGNs) in brightest cluster galaxies (BCGs) depend on the thermodynamics of the intracluster medium (ICM). Our work is based on the 25 clusters observed in the CLASH program for which the aforementioned attributes in their BCGs can be well scruti…
Detection of the Long Period Variable Stars of And II Dwarf Satellite galaxy
van Loon, J. Th.; McDonald, I.; Javadi, A. +5 more
We conducted an extensive study of the spheroidal dwarf satellite galaxies around the Andromeda galaxy to produce an extensive catalog of LPV stars. The optical monitoring project consists of 55 dwarf galaxies and four globular clusters that are members of the Local Group. We have made observations of these galaxies using the WFC mounted on the 2.…
An Eddington-limited Accretion Disk Wind in the Narrow-line Seyfert 1 PG 1448+273
Porquet, D.; Reeves, J. N.; Braito, V. +5 more
PG 1448+273 is a luminous, nearby (z = 0.0645), narrow-line Seyfert 1 galaxy, which likely accretes close to the Eddington limit. Previous X-ray observations of PG 1448+273 with XMM-Newton in 2017 and NuSTAR in 2022 revealed the presence of an ultrafast outflow, as seen through its blueshifted iron (Fe) K absorption profile, where the outflow velo…
The CHEOPS view of the climate of WASP-3 b
Alonso, R.; Deleuil, M.; Erikson, A. +83 more
Context. Hot Jupiters are giant planets subject to intense stellar radiation. The physical and chemical properties of their atmosphere make them the most amenable targets for atmospheric characterization. Aims. In this paper we analyze the photometry collected during the secondary eclipses of the hot Jupiter WASP-3 b by CHEOPS, TESS, and Spitzer. …
Internal Structure of the Magnetic Funnel in the Polar Heliosphere
Kislov, R. A.
According to data obtained by the Ulysses spacecraft in 2017, high-latitude current sheets have been discovered in the polar heliosphere. They have been observed during solar activity minima in 1994 and 2007 at a distance of 2–3 AU above the south pole of the Sun. The discovered current sheets formed a conical surface rotating as a whole around th…
Interaction between a Coronal Mass Ejection and Comet 67P/Churyumov–Gerasimenko
Gombosi, Tamas I.; Combi, Michael R.; Altwegg, Kathrin +6 more
The interaction between a coronal mass ejection (CME) and a comet has been observed several times by in situ observations from the Rosetta Plasma Consortium, which is designed to investigate the cometary magnetosphere of comet 67P/Churyumov–Gerasimenko (CG). Goetz et al. reported a magnetic field of up to 300 nT measured in the inner coma, which i…