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Formation of Phosphorus Monoxide (PO) in the Interstellar Medium: Insights from Quantum-chemical and Kinetic Calculations
Jiménez-Serra, Izaskun; Roncero, Octavio; García de la Concepción, Juan +2 more
In recent years, phosphorus monoxide (PO), an important molecule for prebiotic chemistry, has been detected in star-forming regions and in the comet 67P/Churyumov-Gerasimenko. These studies have revealed that, in the interstellar medium (ISM), PO is systematically the most abundant P-bearing species, with abundances that are about one to three tim…
A Search for Technosignatures around 31 Sun-like Stars with the Green Bank Telescope at 1.15-1.73 GHz
Margot, Jean-Luc; Lynch, Ryan S.; MacDougall, Mason +37 more
We conducted a search for technosignatures in 2018 and 2019 April with the L-band receiver (1.15-1.73 GHz) of the 100 m diameter Green Bank Telescope. These observations focused on regions surrounding 31 Sun-like stars near the plane of the Galaxy. We present the results of our search for narrowband signals in this data set, as well as improvement…
A bright inner disk and structures in the transition disk around the very low-mass star CIDA 1
Testi, L.; Tazzari, M.; Natta, A. +7 more
The frequency of Earth-sized planets in habitable zones appears to be higher around M-dwarfs, making these systems exciting laboratories to investigate planet formation. Observations of protoplanetary disks around very low-mass stars and brown dwarfs remain challenging and little is known about their properties. The disk around CIDA 1 (~0.1-0.2 M<…
Do the observational data favor a local void?
Cai, Rong-Gen; Guo, Zong-Kuan; Ding, Jia-Feng +2 more
The increasing tension between the different local direct measurements of the Hubble expansion rate and that inferred from the cosmic microwave background observation by the Λ -cold-dark-matter model could be a smoking gun of new physics, if not caused by either observational systematics or local bias. We generalize previous investigation on the l…
Current Sheets, Plasmoids and Flux Ropes in the Heliosphere. Part II: Theoretical Aspects
Malova, H. V.; Zelenyi, L. M.; Bruno, R. +13 more
Our understanding of processes occurring in the heliosphere historically began with reduced dimensionality - one-dimensional (1D) and two-dimensional (2D) sketches and models, which aimed to illustrate views on large-scale structures in the solar wind. However, any reduced dimensionality vision of the heliosphere limits the possible interpretation…
Comprehensive investigation of Mars methane and organics with ExoMars/NOMAD
Vandaele, Ann Carine; Aoki, Shohei; Liuzzi, Giuliano +17 more
Methane (CH4) on Mars has attracted a great deal of attention since it was first detected in January 2003. As methane is considered a potential marker for past/present biological or geological activity, any possible detection would require evidence with strong statistical significance. Ethane (C2H6) and ethylene (C…
TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA
Bouchy, F.; de Medeiros, J. R.; Helled, R. +59 more
We present the confirmation of a new sub-Neptune close to the transition between super-Earths and sub-Neptunes transiting the M2 dwarf TOI-269 (TIC 220 479 565, V = 14.4 mag, J = 10.9 mag, R⋆ = 0.40 R⊙, M⋆ = 0.39 M⊙, d = 57 pc). The exoplanet candidate has been identified in multiple TESS sectors, and va…
Kinematic constraints on spatial curvature from supernovae Ia and cosmic chronometers
Malheiro, M.; Jesus, J. F.; Valentim, R. +1 more
An approach to estimate the spatial curvature Ωk from data independently of dynamical models is suggested, through kinematic parametrizations of the comoving distance [DC(z)] with third-degree polynomial, of the Hubble parameter [H(z)] with a second-degree polynomial and of the deceleration parameter [q(z)] with first-order p…
Classical Novae at Radio Wavelengths
Ryder, Stuart D.; Bannister, Keith W.; Strader, Jay +20 more
We present radio observations (1-40 GHz) for 36 classical novae, representing data from over five decades compiled from the literature, telescope archives, and our own programs. Our targets display a striking diversity in their optical parameters (e.g., spanning optical fading timescales, t 2 = 1-263 days), and we find a similar diversi…
The Sloan Digital Sky Survey Reverberation Mapping Project: The MBH-Host Relations at 0.2 ≲ z ≲ 0.6 from Reverberation Mapping and Hubble Space Telescope Imaging
Trump, Jonathan R.; Brandt, W. N.; Shen, Yue +10 more
We present the results of a pilot Hubble Space Telescope (HST) imaging study of the host galaxies of ten quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Probing more than an order of magnitude in black hole (BH) and stellar masses, our sample is the first statistical sample to study the BH-host correlations beyon…