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Near-infrared Studies of Nova V1674 Herculis: A Shocking Record Breaker
Banerjee, D. P. K.; Starrfield, S.; Page, K. L. +3 more
We present near-infrared spectroscopy of Nova Herculis 2021 (V1674 Her), obtained over the first 70 days of its evolution. This fastest nova on record displays a rich emission line spectrum, including strong coronal line emission with complex structures. The hydrogen line fluxes, combined with a distance of ${4.7}_{-1.0}^{+1.3}$ kpc, give an upper…
Inhomogeneity in the early Galactic chemical enrichment exposed by beryllium abundances in extremely metal-poor stars
Pasquini, L.; Smiljanic, R.; Zych, M. G.
Context. Abundances of beryllium in metal-poor stars scale linearly with metallicity down to [Fe/H] ∼ -3.0. In the stars where Be has been detected at this extremely metal-poor regime, an increased abundance scatter has been previously reported in the literature. This scatter could indicate a flattening of the relation between Be abundances and me…
Searching for gravitational waves via Doppler tracking by future missions to Uranus and Neptune
Saha, Prasenjit; D'Orazio, Daniel J.; Soyuer, Deniz +1 more
The past year has seen numerous publications underlining the importance of a space mission to the ice giants in the upcoming decade. Proposed mission plans involve a ∼10 yr cruise time to the ice giants. This cruise time can be utilized to search for low-frequency gravitational waves (GWs) by observing the Doppler shift caused by them in the Earth…
Evolution of the truncated disc and inner hot-flow of GX 339-4
Chainakun, P.; Young, A. J.; Luangtip, W. +2 more
Aims: We study the changes in geometry of the truncated disc and the inner hot-flow of GX 339-4 by analysing the power spectral density (PSD) extracted from six XMM-Newton observations taken at the very end of an outburst.
Methods: We developed a theoretical model of the PSD of GX 339-4 in the 0.3-0.7 keV (thermal-reverberation-dominated…
Protocluster detection in simulations of HSC-SSP and the 10-yr LSST forecast, using PCcones
Overzier, Roderik A.; Sodré, Laerte, Jr.; Araya-Araya, Pablo +2 more
The progenitors of present-day galaxy clusters give important clues about the evolution of the large-scale structure, cosmic mass assembly, and galaxy evolution. Simulations are a major tool for these studies since they are used to interpret observations. In this work, we introduce a set of 'protocluster-light-cones', dubbed PCcones. They are mock…
New Results on the Direct Observations of Thermal Radio Emission from a Solar Coronal Mass Ejection
Ramesh, R.; Kumari, A.; Kathiravan, C. +2 more
We report observations of thermal emission from the frontal structure of a coronal mass ejection (CME) using data obtained with the Gauribidanur RAdioheliograPH simultaneously at 80 and 53 MHz on May 1, 2016. The CME was due to activity on the far side of the Sun, but near its limb. No nonthermal radio burst activity was noticed. This provided an …
Local topography effects on the surface temperatures on Mars - Application to the case of Recurring Slope Lineae (RSL)
Quantin-Nataf, Cathy; Leyrat, Cédric; Millot, Cédric +1 more
Recurring Slope Lineae (RSL) are dark linear recurrent features which incrementally lengthen and fade each year on Martian slopes. Their activity during warmest seasons rises the question of modern martian water related process. To investigate this question, this study focuses on the thermal context of slopes hosting RSL. The paper presents a nume…
Superresolution Reconstruction of Severely Undersampled Point-spread Functions Using Point-source Stacking and Deconvolution
Zemcov, Michael; Symons, Teresa; Bock, James +4 more
Point-spread function (PSF) estimation in spatially undersampled images is challenging because large pixels average fine-scale spatial information. This is problematic when fine-resolution details are necessary, as in optimal photometry where knowledge of the illumination pattern beyond the native spatial resolution of the image may be required. H…
Implications of triangular features in the Gaia skymap for the Caustic Ring Model of the Milky Way halo
Gonzalez, Anthony H.; Chakrabarty, Sankha S.; Sikivie, Pierre +1 more
The Gaia map of the Milky Way reveals a pair of triangular features at nearly symmetric locations on opposite sides of the Galactic Center. In this paper we explore the implications of these features assuming they are manifestations of a caustic ring in the dark matter distribution of the Milky Way halo. The existence of a series of such rings is …
HST PanCET program: non-detection of atmospheric escape in the warm Saturn-sized planet WASP-29 b
Sanz-Forcada, J.; Ehrenreich, D.; Lecavelier des Etangs, A. +10 more
Short-period gas giant exoplanets are susceptible to intense atmospheric escape due to their large scale heights and strong high-energy irradiation. This process is thought to occur ubiquitously, but to date we have only detected direct evidence of atmospheric escape in hot Jupiters and warm Neptunes. The latter planets are particularly more sensi…