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New gravity field of comet 67P/C-G based on Rosetta's Doppler and optical data
Marty, Jean-Charles; Jorda, Laurent; Le Maistre, Sebastien +3 more
The gravity field of a celestial body gives valuable insights into its fundamental properties such as its density and internal structure. The Doppler data collected by the Radio-Science Investigation (RSI) experiment of the Rosetta mission were previously used to determine the gravity field of comet 67P/Churyumov–Gerasimenko up to degree 2 (Pätzol…
H2 molecular gas in the old planetary nebula NGC 3587
Guerrero, M. A.; Toalá, J. A.; Ramos-Larios, G. +2 more
The acquisition of high-quality deep images of planetary nebulae (PNe) has allowed the detection of a wealth of small-scale features, which highlight the complexity of the formation history and physical processes shaping PNe. Here we present the discovery of three groups of clumps embedded within the nebular shell of the evolved PN NGC 3587, the O…
Triple trouble with PSR J1618‑3921: Mass measurements and orbital dynamics of an eccentric millisecond pulsar
Guillemot, L.; Possenti, A.; Kramer, M. +11 more
Context. PSR J1618‑3921 is one of five known millisecond pulsars (MSPs) in eccentric orbits (eMPSs) located in the Galactic plane, whose formation is poorly understood. Earlier studies of these objects revealed significant discrepancies between observations and predictions from standard binary evolution scenarios of pulsar-helium white dwarf (HeWD…
A Dust-Scattering Model for M1-92: A Revised Estimate of the Mass Distribution and Inclination
Morris, Mark R.; Sahai, Raghvendra; Li, Yun Qi
Preplanetary nebulae (PPNe) are formed from mass-ejecting late-stage AGB stars. Much of the light from the star gets scattered or absorbed by dust particles, giving rise to the observed reflection nebula seen at visible and near-IR wavelengths. Precursors to planetary nebulae (PNe), PPNe generally have not yet undergone any ionization by UV radiat…
Molecular Bubble and Outflow in S Mon Revealed by Multiband Data Sets
Xu, Ye; Liu, Dejian; Hao, Chaojie +8 more
We identify a molecular bubble, and study the star formation and its feedback in the S Mon region, using multiple molecular lines, young stellar objects (YSOs), and infrared data. We revisit the distance to S Mon, ∼722 ± 9 pc, using Gaia Data Release 3 parallaxes of the associated Class II YSOs. The bubble may be mainly driven by a massive binary …
Two methods for separating the magnetospheric solar wind charge exchange soft X-ray emission from the diffuse X-ray background
Ji, Li; Wang, Chi; Carter, Jennifer A. +5 more
Solar flares in the Solar Orbiter era: Short-exposure EUI/FSI observations of STIX flares
Krucker, Säm; Veronig, Astrid M.; Polito, Vanessa +10 more
Aims. This paper aims to demonstrate the importance of short-exposure extreme ultraviolet (EUV) observations of solar flares in the study of particle acceleration, heating, and energy partition in flares. This work highlights the observations now available from the Extreme Ultraviolet Imager (EUI) instrument suite on board Solar Orbiter while oper…
Orbits of Binary Stars: from Visual Measures to Speckle Interferometry
Tokovinin, Andrei
Knowledge of the orbits of visual binary stars has always been one of the fundamentals of astronomy. Based historically on the visual measures, nowadays the orbits rely more (or exclusively) on the accurate speckle data. This prompts reconsideration of the methods of orbit calculation, undertaken here and illustrated by 20 examples, from accurate …
Q-band line survey observations toward a carbon-chain-rich clump in the Serpens South region
Lai, Shih-Ping; Liu, Sheng-Yuan; Nakamura, Fumitaka +17 more
We have conducted Q-band (30-50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with the extended Q-band (eQ) receiver installed on the Nobeyama 45 m radio telescope. Approximately 180 lines have been detected, including tentative detection, and these lines are attributed to 52 molecule…
A review of 70 years with astrometry: From meridian circles to Gaia and beyond
Høg, Erik
In 1953 I heard of an experiment in 1925 by Bengt Strömgren where he observed transit times with the meridian circle at the Copenhagen University Observatory measuring the current in a photocell behind slits when a star was crossing. In 1954 just 22 years old I was given the task as a student to make first test observations with a new meridian cir…