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Transition region response to quiet-Sun Ellerman bombs
Joshi, Jayant; Rouppe van der Voort, Luc; Bhatnagar, Aditi
Context. Quiet-Sun Ellerman bombs (QSEBs) are key indicators of small-scale photospheric magnetic reconnection events. Recent high-resolution observations have shown that they are ubiquitous and that large numbers of QSEBs can be found in the quiet Sun. Aims. We aim to understand the impact of QSEBs on the upper solar atmosphere by analyzing their…
The BANANA Project. VII. High Eccentricity Predicts Spin–Orbit Misalignment in Binaries
Winn, Joshua N.; Albrecht, Simon H.; Lundkvist, Mia S. +3 more
The degree of spin–orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin–or…
Inferring the distribution of the ionising photon escape fraction
Mason, Charlotte A.; Cullen, Fergus; McLure, Ross J. +2 more
Context. The escape fraction of ionising photons from galaxies (fesc) is a key parameter for understanding how intergalactic hydrogen became reionised, but it remains mostly unconstrained. Measurements have been limited to the average value in galaxy ensembles and to handfuls of individual detections. Aims. To help understand which mech…
Oxygen abundance of γ Vel from [O III] 88 µm Herschel/PACS spectroscopy
Hillier, D. J.; Morris, P. W.; Barlow, M. J. +4 more
We present Herschel PACS spectroscopy of the [O III] 88.4 µm fine-structure line in the nearby WC8+O binary system γ Vel to determine its oxygen abundance. The critical density of this line corresponds to several 105R* such that it is spatially extended in PACS observations at the 336 pc distance to γ Vel. Two approache…
Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation
Huber, Daniel; Berger, Travis A.; Gaidos, Eric +10 more
Small planets (R p ≤ 4 R ⊕) are divided into rocky super-Earths and gaseous sub-Neptunes separated by a radius gap, but the mechanisms that produce these distinct planet populations remain unclear. Binary stars are the only main-sequence systems with an observable record of the protoplanetary disk lifetime and mass reservoi…
Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST
Murray, Claire E.; Gordon, Karl D.; Peek, J. E. G. +2 more
Resolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or migrated there after forming in denser environments. To address this question, we use multiresol…
Gamma-Ray Burst Observations by the High-Energy Particle Detector on board the China Seismo-Electromagnetic Satellite between 2019 and 2021
Vitale, V.; Ubertini, P.; Bazzano, A. +68 more
In this paper we report the detection of five strong gamma-ray bursts (GRBs) by the High-Energy Particle Detector (HEPD-01) mounted on board the China Seismo-Electromagnetic Satellite, operational since 2018 on a Sun-synchronous polar orbit at a ~507 km altitude and 97° inclination. HEPD-01 was designed to detect high-energy electrons in the energ…
JWST imaging of the closest globular clusters: IV. Chemistry, luminosity, and mass functions of the lowest-mass members in the NIRISS parallel fields
Salaris, M.; Apai, D.; Anderson, J. +9 more
We present observations of the two closest globular clusters, NGC 6121 and NGC 6397, taken with the NIRISS detector of JWST. The combination of our new JWST data with archival Hubble Space Telescope (HST) images allows us to compute proper motions, disentangle cluster members from field objects, and probe the main sequence (MS) of the clusters dow…
ICECUBE AGN neutrino candidate PKS 1717+177: dark deflector bends nuclear jet
Popović, L. Č.; Britzen, S.; Zajaček, M. +8 more
The BL Lac object PKS 1717+177 has been identified as potential neutrino-emitting active galactic nuclei in the point source stacking analysis of ICECUBE data. We explore peculiarities in the morphology and kinematics of the jet and examine multiwavelength light curves for distinctive effects which might allow to pinpoint a likely neutrino generat…
oMEGACat. IV. Constraining the Ages of Omega Centauri Subgiant Branch Stars with HST and MUSE
Wang, Z.; Latour, M.; Kacharov, N. +13 more
We present age estimates for over 8100 subgiant branch (SGB) stars in Omega Centauri (ω Cen) to study its star formation history. Our large data set, which combines multi-wavelength Hubble Space Telescope photometry with MUSE metallicities, provides an unprecedented opportunity to measure individual stellar ages. We do this by fitting each star's …