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Detailed cool star flare morphology with CHEOPS and TESS***
Alonso, R.; Deleuil, M.; Erikson, A. +79 more
Context. White-light stellar flares are proxies for some of the most energetic types of flares, but their triggering mechanism is still poorly understood. As they are associated with strong X and ultraviolet emission, their study is particularly relevant to estimate the amount of high-energy irradiation onto the atmospheres of exoplanets, especial…
Revisit of 77 Clusters Candidates with Multiple Main Sequences using Gaia DR3
Li, Zhongmu; Chen, Jing; Zhang, Su +2 more
Gaia DR3 data provide the latest and full astrometric data for more than 1.5 billion sources, and these allow us to revisit the 77 special open cluster candidates collected from LISC star cluster catalog. According to their unclear color-magnitude-diagram (CMD) morphology, they are difficult to be ensured as real open clusters (OCs), and their clu…
JWST observations of the Horsehead photon-dominated region. I. First results from multi-band near- and mid-infrared imaging
Abergel, A.; Bouchet, P.; Brandl, B. R. +14 more
Context. The James Webb Space Telescope (JWST) has captured the sharpest infrared images ever taken of the Horsehead nebula, a prototypical moderately irradiated photon-dominated region (PDR) that is fully representative of most of the UV-illuminated molecular gas in the Milky Way and star-forming galaxies.
Aims: We investigate the impact of …
The structural properties of nearby dwarf galaxies in low-density environments - size, surface brightness, and colour gradients
Kaviraj, S.; Watkins, A. E.; Lazar, I. +3 more
We use a complete sample of 211 nearby (
Chemical abundances and ionizing mechanisms in the star-forming double-ring of AM 0644-741 using MUSE data
Oskinova, L. M.; Sander, A. A. C.; Charlot, S. +6 more
We present the analysis of archival Very Large Telescope Multi-Unit Spectroscopic Explorer observations of 179 H II regions in the star-forming double-ring collisional galaxy AM 0644-741 at 98.6 Mpc. We determined ionic abundances of He, N, O, and Fe using the direct method for the brightest H II region (ID 39); we report $\log \rm {(\frac{N}{O})}…
Long-term evolution of cyclotron line energy in an eclipsing pulsar 4U 1538-522
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We present the timing and spectral analysis of the high-mass X-ray binary source 4U 1538-522 using Nuclear Spectroscopic Telescope Array (NuSTAR) observations. One of the observations partially covers the X-ray eclipse of the source along with eclipse ingress. The source is found to spin down at the rate of 0.163 ± 0.002 s yr-1 between …
A Markedly Expanded Sample of Candidate X-Ray-emitting Isolated Neutron Stars
Anderson, Scott F.; Agüeros, Marcel A.; Demasi, Sebastian
The current sample of 12 radio-quiet isolated neutron stars that emit strongly in X-rays (XINSs) is both small and heterogeneous, limiting its usefulness for understanding the physics of neutron star atmospheres and cooling rates and for constraining the equation of state of neutron degenerate matter. Utilizing the ROSAT 1RXS and 2RXS data sets, i…
First holistic modelling of meteoroid ablation and fragmentation: A case study of the Orionids recorded by the Canadian Automated Meteor Observatory
Vida, Denis; Brown, Peter G.; Campbell-Brown, Margaret +1 more
18 mm-sized Orionid meteoroids were captured in 2019 and 2020 by the Canadian Automated Observatory's mirror tracking system. Meteor position measurements were made to an accuracy of ∼1m and the meteors were tracked to a limiting magnitude of about + 7 . 5 at the faintest point. The trajectory estimation shows the intrinsic physical dispersion of …
TIARA TESS 1: estimating exoplanet yields from Years 1 and 3 SPOC light curves
Bayliss, Daniel; Gill, Samuel; Hawthorn, Faith +1 more
We present a study of the detection efficiency for the TESS mission, focusing on the yield of longer period transiting exoplanets (P > 25 d). We created the Transit Investigation and Recoverability Application (TIARA) pipeline to use real TESS data with injected transits to create sensitivity maps which we combine with occurrence rates derived …
The Infrared Auroral Footprint Tracks of Io, Europa and Ganymede at Jupiter Observed by Juno-JIRAM
Altieri, F.; Sindoni, G.; Piccioni, G. +20 more
The electromagnetic coupling between the Galilean satellites at Jupiter and the planetary ionosphere generates an auroral footprint, which is detected with high spatial resolution in the infrared L band by the Jovian InfraRed Auroral Mapper (JIRAM) onboard the Juno spacecraft. We report the JIRAM data acquired since 27 August 2016 until 23 May 202…