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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…
Survey for Distant Solar Twins (SDST) - III. Identification of new solar twin and solar analogue stars
Murphy, Michael T.; Liu, Fan; Flynn, Chris +3 more
The Survey for Distant Solar Twins aims to find stars very similar to the Sun at distances of 1-$4\, {\rm kpc}$, several times more distant than any currently known solar twins and analogues. The goal is to identify the best stars with which to test whether the fine-structure constant, α, varies with dark matter density in our Galaxy. Here, we use…
Multifrequency Microwave Imaging of Weak Transients from the Quiet Solar Corona
Chen, Bin; Yu, Sijie; Mondal, Surajit
Understanding the dynamics of the quiet solar corona is important for answering key questions including the coronal heating problem. Multiple studies have suggested small-scale magnetic-reconnection events may play a crucial role. These reconnection events are expected to involve acceleration of electrons to suprathermal energies, which can then p…
Spectrum of the secondary component and new orbital elements of the massive triple star δ Ori A
Wade, G. A.; Lovekin, C. C.; Harmanec, P. +13 more
δ Orionis is the closest massive multiple stellar system and one of the brightest members of the Orion OB association. The primary (Aa1) is a unique evolved O star. In this work, we applied a two-step disentangling method to a series of spectra in the blue region (430-450 nm), and we detected spectral lines of the secondary (Aa2). For the first ti…