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The Magellan/PFS Exoplanet Search: a 55-d period dense Neptune transiting the bright (V = 8.6) star HD 95338
Butler, R. Paul; Kane, Stephen R.; Crane, Jeffrey D. +14 more
We report the detection of a transiting, dense Neptune planet candidate orbiting the bright (V = 8.6) K0.5V star HD 95338. Detection of the 55-d periodic signal comes from the analysis of precision radial velocities from the Planet Finder Spectrograph on the Magellan II Telescope. Follow-up observations with HARPS also confirm the presence of the …
The Population of Galactic Planetary Nebulae: a Study of Distance Scales and Central Stars Based on the Second Gaia Release
Stanghellini, Letizia; Bucciarelli, Beatrice; Lattanzi, Mario G. +1 more
We matched the astrometry of central stars (CSs) of spectroscopically confirmed Galactic planetary nebulae (PNe) with DR2 Gaia parallaxes (p), finding 430 targets in common with p > 0 and $| {\sigma }_{{\rm{p}}}/p| \lt 1$ ∣ σ p / p ∣ < 1 . A catalog of PNe whose CSs have DR2 Gaia parallaxes is presented in Table 1. We compared DR2 parallaxes…
Experimental Phase Function and Degree of Linear Polarization Curves of Millimeter-sized Cosmic Dust Analogs
Sierks, H.; Blum, J.; Fulle, M. +22 more
We present laboratory measurements of the phase functions and degree of linear polarization (DLP) curves of a selection of millimeter-sized cosmic dust analog particles. The set includes particles with similar sizes but diverse internal structure (compact and porous) and absorbing properties. The measured phase functions are found to be in all cas…
TESS observations of southern ultrafast rotating low-mass stars
Ramsay, Gavin; Doyle, Lauren; Doyle, J. Gerry
In our previous study of low-mass stars using TESS, we found a handful that show a periodic modulation on a period <1 d but also displayed no flaring activity. Here we present the results of a systematic search for ultrafast rotators (UFRs) in the Southern ecliptic hemisphere, which were observed in 2-min cadence with TESS. Using data from Gaia…
Stellar occultations enable milliarcsecond astrometry for Trans-Neptunian objects and Centaurs
Naletto, G.; Pál, A.; Snodgrass, C. +66 more
Context. Trans-Neptunian objects (TNOs) and Centaurs are remnants of our planetary system formation, and their physical properties have invaluable information for evolutionary theories. Stellar occultation is a ground-based method for studying these distant small bodies and has presented exciting results. These observations can provide precise pro…
A statistical study of plasmoids associated with a post-CME current sheet
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Context. Coronal mass ejections (CMEs) are often observed to be accompanied by flare, current sheets, and plasmoids/plasma blobs. 2D and 3D numerical simulations and observations reported plasmoids moving upward as well as downward along the current sheet.
Aims: We aim to investigate the properties of plasmoids observed in the current sheet f…
Most EL CVn systems are inner binaries of hierarchical triples
Gänsicke, B. T.; Parsons, S. G.; Schreiber, M. R. +2 more
In spite of their importance for modern astronomy, we do not fully understand how close binary stars containing at least one white dwarf form from main-sequence binary stars. The discovery of EL CVn binaries, close pre-white dwarfs with A/F main-sequence star companions, offers now the unique possibility to test models of close compact binary star…
Distribution of methanol and cyclopropenylidene around starless cores★
Nagy, Z.; Caselli, P.; Spezzano, S. +3 more
Context. The spatial distribution of molecules around starless cores is a powerful tool for studying the physics and chemistry governing the earliest stages of star formation.
Aims: Our aim is to study the chemical differentiation in starless cores to determine the influence of large-scale effects on the spatial distribution of molecules with…
K2 Ultracool Dwarfs Survey - VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
Mullan, D. J.; Burgasser, A. J.; Gizis, J. E. +3 more
Kepler K2 long cadence data are used to study white light flares in a sample of 45 L dwarfs. We identified 11 flares on 9 L dwarfs with equivalent durations of (1.3-198) h and total (UV/optical/IR) energies of ≥0.9 × 1032 erg. Two superflares with energies of >1033 erg were detected on an L5 dwarf (VVV BD001): this is the …
The 2019 eruption of recurrent nova V3890 Sgr: observations by Swift, NICER, and SMARTS
Ness, J. -U.; Orio, M.; Osborne, J. P. +6 more
V3890 Sgr is a recurrent nova that has been seen in outburst three times so far, with the most recent eruption occurring on 2019 August 27 UT. This latest outburst was followed in detail by the Neil Gehrels Swift Observatory, from less than a day after the eruption until the nova entered the Sun observing constraint, with a small number of additio…