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Third Epoch HST Imaging of a Nonradiative Shock in the Cygnus Loop Supernova Remnant
Blair, William P.; Raymond, John C.; Sankrit, Ravi
We present new HST/WFC3 optical images of a region in the northeastern part of the Cygnus Loop supernova remnant, which includes a well-studied Balmer-line filament. These data represent the third epoch of HST Hα imaging and a second epoch of [O III] λ5007 imaging of that particular filament. The Hα images were used to measure the proper motions a…
TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +89 more
Context. TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have provided measurements of planetary masses that differ by ∼2σ.
Aims: Our aim in this work is to solve the inco…
The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Pothuneni, Ravi Raja
The first photometric, spectroscopic and period variation studies of neglected short-period eclipsing binary V2840 Cygni are presented. High mass ratio contact binaries (HMRCBs), especially those in the weak-contact configuration, are vital when probing the evolutionary models of contact binaries (CBs) using stellar parameters. The photometric sol…
Low NH3/H2O ratio in comet C/2020 F3 (NEOWISE) at 0.7 au from the Sun
McGuire, Brett A.; Drozdovskaya, Maria N.; Opitom, Cyrielle +7 more
Context. A lower-than-solar elemental nitrogen content has been demonstrated for several comets, including 1P/Halley and 67P/Churyumov-Gerasimenko (67P/C-G) with independent in situ measurements of volatile and refractory budgets. The recently discovered semi-refractory ammonium salts in 67P/C-G are thought to be the missing nitrogen reservoir in …
TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
Bouchy, F.; Stassun, K.; Winn, J. N. +31 more
We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M⊙ G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and CHIRON on the 1.5 m telescope at the Cerro Tololo Inter-American Observatory (CTIO), we…
A deep dive into the Type II globular cluster NGC 1851
Milone, A. P.; Cordoni, G.; Marino, A. F. +13 more
About one-fifth of the Galactic globular clusters (GCs), dubbed Type II GCs, host distinct stellar populations with different heavy elements abundances. NGC 1851 is one of the most studied Type II GCs, surrounded by several controversies regarding the spatial distribution of its populations and the presence of star-to-star [Fe/H], C+N+O, and age d…
The Second International Asteroid Warning Network Timing Campaign: 2005 LW3
Licandro, Javier; Granvik, Mikael; Thuillot, William +90 more
The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for a second observing campaign to test the timing accuracy of astrometric observation. With 82 participating stations, the International Asteroid Warning Network collected 1046 observations of 2005 LW3 around the time of the close approach.…
NuSTAR and XMM-Newton observations of the binary 4FGL J1405.1-6119. A γ-ray-emitting microquasar?
Fogantini, Federico A.; Combi, Jorge A.; Romero, Gustavo E. +3 more
Context. 4FGL J1405.1−6119 is a high-mass γ-ray-emitting binary that has been studied at several wavelengths. The nature of this type of binary is still under debate, with three possible scenarios usually invoked to explain the origin of the γ-ray emission: collisions between the winds of a rapidly rotating neutron star and its companion, collisio…
Solar Wind Protons Forming Partial Ring Distributions at Comet 67P
Gunell, H.; Nilsson, H.; Richter, I. +5 more
We present partial ring distributions of solar wind protons observed by the Rosetta spacecraft at comet 67P/Churyumov-Gerasimenko. The formation of ring distributions is usually associated with high activity comets, where the spatial scales are larger than multiple ion gyroradii. Our observations are made at a low-activity comet at a heliocentric …
Interpretation of Flat Energy Spectra Upstream of Fast Interplanetary Shocks
Zimbardo, Gaetano; Servidio, Sergio; Wilson, Lynn B., III +6 more
Interplanetary shocks are large-scale heliospheric structures often caused by eruptive phenomena at the Sun, and represent one of the main sources of energetic particles. Several interplanetary (IP) shock crossings by spacecraft at 1 au have revealed enhanced energetic-ion fluxes that extend far upstream of the shock. Surprisingly, in some shock e…