Search Publications
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…
Forbidden hugs in pandemic times. I. Luminous red nova AT 2019zhd, a new merger in M 31
Lundqvist, P.; Rest, A.; Munari, U. +20 more
We present the follow-up campaign of the luminous red nova (LRN)
Water Group Exospheres and Surface Interactions on the Moon, Mercury, and Ceres
Li, Shuai; Wöhler, Christian; Berezhnoy, Alexey A. +7 more
Water ice, abundant in the outer solar system, is volatile in the inner solar system. On the largest airless bodies of the inner solar system (Mercury, the Moon, Ceres), water can be an exospheric species but also occurs in its condensed form. Mercury hosts water ice deposits in permanently shadowed regions near its poles that act as cold traps. W…
ALMA survey of Lupus class III stars: Early planetesimal belt formation and rapid disc dispersal
Testi, L.; Tazzari, M.; Williams, J. P. +9 more
Class III stars are those in star forming regions without large non-photospheric infrared emission, suggesting recent dispersal of their protoplanetary discs. We observed 30 class III stars in the 1-3 Myr Lupus region with ALMA at ∼856µm, resulting in four detections that we attribute to circumstellar dust. Inferred dust masses are 0.036-0.0…
Cloud-by-cloud, multiphase, Bayesian modelling: application to four weak, low-ionization absorbers
Richter, Philipp; Charlton, Jane C.; Kacprzak, Glenn G. +8 more
We present a new method aimed at improving the efficiency of component by component ionization modelling of intervening quasar absorption-line systems. We carry out cloud-by-cloud, multiphase modelling making use of CLOUDY and Bayesian methods to extract physical properties from an ensemble of absorption profiles. Here, as a demonstration of metho…