Search Publications
The Ultraviolet Martian Dayglow Observed With NOMAD/UVIS on ExoMars Trace Gas Orbiter
Vandaele, A. C.; Thomas, I. R.; Ristic, B. +9 more
The Trace Gas Orbiter has been orbiting Mars since 2016 with the Nadir and Occultation for MArs Discovery (NOMAD) UltraViolet and Visible Spectrometer (UVIS) instrument on board. Focusing on limb observations recorded in the ultraviolet (UV) part of the NOMAD/UVIS spectra, we describe here the CO Cameron bands, CO2+ UV double…
Simulation of the Solar Energetic Particle Event on 2020 May 29 Observed by Parker Solar Probe
Balmaceda, Laura A.; Zhang, Ming; Lario, David +3 more
This paper presents a stochastic three-dimensional focused transport simulation of solar energetic particles (SEPs) produced by a data-driven coronal mass ejection (CME) shock propagating through a data-driven model of coronal and heliospheric magnetic fields. The injection of SEPs at the CME shock is treated using diffusive shock acceleration of …
The Equilibrium of Coronal Loops Near Separatrices
Antiochos, Spiro K.; Bradshaw, Stephen; Mason, Emily I.
We present numerical models from the field-aligned HYDrodynamics and RADiation code (HYDRAD) of a highly asymmetric closed coronal loop with near-singular expansion factor. This loop was chosen to simulate a coronal magnetic flux tube that passes close to a null point, as in the last set of closed loops under the fan surface of a coronal jet or a …
The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib
Amado, P. J.; Caballero, J. A.; Pallé, E. +29 more
We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (d ≈ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey. We determined a planetary minimum mass of Mb sin i = 5.46 ± 0.75 M⊕ and an orbital period of Pb = 36.116 ± 0.029 d, using ~5 yr of CARMENES da…
CS-ROMER: a novel compressed sensing framework for Faraday depth reconstruction
Scaife, Anna M. M.; Leahy, J. Patrick; Cárcamo, Miguel +1 more
The reconstruction of Faraday depth structure from incomplete spectral polarization radio measurements using the RM synthesis technique is an underconstrained problem requiring additional regularization. In this paper, we present cs-romer: a novel object-oriented compressed sensing framework to reconstruct Faraday depth signals from spectropolariz…
Raman Scattering by Atomic Hydrogen in Photodissociation Regions: An Alternative to the Polycyclic Aromatic Hydrocarbons Hypothesis
Zagury, Frédéric
Photodissociation regions (PDRs) illuminated by high temperature (T > 104 K) radiation fields display characteristic optical to midinfrared spectral features: emission bands that cluster around the blue limits of hydrogen series, an extended red emission (ERE) in the vicinity of Hα, and a continuum in the infrared part of the spectru…
The First Photometric Study of the Binary System CSS J003106.8+313347
Poro, A.; Paki, E.; Baudart, S.
We performed the first photometric study of the CSS J003106.8+313347 W Ursae Majoris (WUMa)-type system based on ground-based observations. We extracted times of minima from our observations and proposed a linear ephemeris based on the increasing incline of the orbital period using a Markov chain Monte Carlo (MCMC) approach. The PHOEBE Python code…
Complex Organics in Space: A Changing View of the Cosmos
Kwok, Sun
Planetary explorations have revealed that complex organics are widely present in the solar system. Astronomical infrared spectroscopic observations have discovered that complex organics are synthesized in large quantities in planetary nebulae and distributed throughout the galaxy. Signatures of organics have been found in distant galaxies, as earl…
Reconciling results of 2019 and 2020 stellar occultations on Pluto's atmosphere. New constraints from both the 5 September 2019 event and consistency analysis
Fu, Yanning; Yuan, Ye; Chen, Jian +14 more
A stellar occultation by Pluto on 5 September 2019 yielded positive detections at two separate stations. Using an approach consistent with comparable studies, we derived a surface pressure of 11.478 ± 0.55 µbar for Pluto's atmosphere from the observations of this event. In addition, to avoid potential method inconsistencies when comparing with his…
The basic solar wind speed distribution and its sunspot cycle variations
Akasofu, Syun-Ichi; Lee, Lou-Chuang
In this paper, it is suggested that the latitudinal solar wind speed observed by the Ulysses spacecraft during the lowest solar activity (when both the ecliptic and magnetic equators coincide) may be identified as the basic speed distribution throughout the solar cycle. We demonstrate this suggestion by rotating this particular Ulysses distributio…