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Two successive EUV waves and a transverse oscillation of a quiescent prominence
Li, Y.; Yan, X. L.; Zhang, Q. M. +4 more
In this paper, we carry out multiwavelength observations of two successive extreme-ultraviolet (EUV) waves originating from active region (AR) NOAA 13575 and a transverse oscillation of a columnar quiescent prominence on 2024 February 9. A hot channel eruption generates an X3.4 class flare and the associated full-halo coronal mass ejection (CME), …
Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
Rice, Malena; Wang, Songhu; Wang, Xian-Yu +5 more
Despite decades of effort, the mechanisms by which the spin axis of a star and the orbital axes of its planets become misaligned remain elusive. In particular, it is of great interest whether the large spin–orbit misalignments observed are driven primarily by high-eccentricity migration—expected to have occurred for short-period, isolated planets—…
Structure formation with primordial black holes to alleviate early star formation tension revealed by JWST
Padilla, N.; Colazo, P. E.; Stasyszyn, F.
Context. This Letter explores the potential role of primordial black holes (PBHs) to address cosmological tensions as the presence of more massive than expected galaxies at high redshifts, as indicated by recent James Webb Space Telescope observations.
Aims: Motivated by inflation models that enhance the power at scales beyond the observable …
The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
Kilpatrick, Charles D.; Simha, Sunil; Prochaska, J. Xavier +10 more
We present observations from the Gemini Multi-Conjugate Adaptive Optics System/Gemini South Adaptive Optics Imager at Gemini South of five fast radio burst (FRB) host galaxies of FRBs with subarcsecond localizations. We examine and quantify the spatial distributions and locations of the FRBs with respect to their host galaxy light distributions, f…
Modeling JWST MIRI-MRS Observations of T Cha: Mid-IR Noble Gas Emission Tracing a Dense Disk Wind
Pascucci, Ilaria; Gorti, Uma; Clarke, Cathie J. +8 more
[Ne II] 12.81 µm emission is a well-used tracer of protoplanetary disk winds due to its blueshifted line profile. Mid-Infrared Instrument (MIRI)-Medium Resolution Spectrometer (MRS) recently observed T Cha, detecting this line along with lines of [Ne III], [Ar II], and [Ar III], with the [Ne II] and [Ne III] lines found to be extended while …
Ultra-low-frequency LOFAR spectral indices of cluster radio halos
Di Gennaro, G.; Brunetti, G.; Tasse, C. +12 more
Context. A fraction of galaxy clusters harbor diffuse radio sources known as radio halos. The prevailing theory regarding their formation is based on second-order Fermi reacceleration of seed electrons caused by merger-driven turbulence in the intra-cluster medium. This mechanism is expected to be inefficient, which implies that a significant frac…
Star-formation activity of low-mass galaxies at the peak epoch of galaxy formation probed by deep narrow-band imaging
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +5 more
Low-mass galaxies at high redshifts are the building blocks of more massive galaxies at later times and are thus key populations for understanding galaxy formation and evolution. We have made deep narrow-band observations for two protoclusters and the general field in COSMOS at z ~ 2. In a clumpy young protocluster, USS1558-003, at z = 2.53, we fi…
Flares confirmed for the first time to be from the primary component of an eclipsing binary
Li, Kai; Gao, Xing; Sun, Guo-You +3 more
Only a handful of precise observations of flare detected from a contact binary so far. This paper presents the photometric and spectroscopic analysis of a contact binary (ASAS J082243+1927.0). Two flare events detected from this object were observed in the data of TESS. The two flare events both occurred at the secondary minimum. Considering the t…
A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS
Trifonov, Trifon; Henning, Thomas; Triaud, Amaury H. M. J. +48 more
We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Ground-based photometric and spectroscopic follow-up from different facilities, confirmed the substellar nature of…
How Gaia sheds light on the Milky Way star cluster population
Casamiquela, L.; Cantat-Gaudin, T.
Star clusters are among the first celestial objects catalogued by early astronomers. As simple and coeval populations, their study has been instrumental in charting the properties of the Milky Way and providing insight into stellar evolution through the 20th century. Clusters were traditionally spotted as local stellar overdensities in the plane o…