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The Mass-loss History of the Red Hypergiant VY CMa
Humphreys, Roberta M.; Davidson, Kris; Jones, Terry J. +3 more
Imaging and spectroscopy of the knots, clumps, and extended arcs in the complex ejecta of VY CMa confirm a record of high mass-loss events over the past few hundred years. Hubble Space Telescope/Space Telescope Imaging Spectrograph spectroscopy of numerous small knots close to the star allow us to measure their radial velocities from the strong K …
Blue straggler stars in open clusters using Gaia: dependence on cluster parameters and possible formation pathways
Jadhav, Vikrant V.; Subramaniam, Annapurni
Blue straggler stars (BSSs) are the most massive stars in a cluster formed via binary or higher order stellar interactions. Though the exact nature of such formation scenarios is difficult to pin down, we provide observational constraints on the different possible mechanism. In this quest, we first produce a catalogue of BSSs using Gaia DR2 data. …
HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b
Nikolov, Nikolay; Sing, David K.; MacDonald, Ryan J. +12 more
We present a new optical transmission spectrum of the hot Jupiter WASP-79b. We observed three transits with the STIS instrument mounted on the Hubble Space Telescope (HST), spanning 0.3-1.0 µm. Combining these transits with previous observations, we construct a complete 0.3-5.0 µm transmission spectrum of WASP-79b. Both HST and ground-…
Temperature and Distance Dependence of Tidal Circularization in Close Binaries: A Catalog of Eclipsing Binaries in the Southern Hemisphere Observed by the TESS Satellite
Albrecht, Simon; Justesen, Anders B.
Tidal forces are important for understanding how close binary stars and compact exoplanetary systems form and evolve. However, tides are difficult to model, and significant uncertainties exist about the strength of tides. Here, we investigate tidal circularization in close binaries using a large sample of well-characterized eclipsing systems. We s…
A dusty filament and turbulent CO spirals in HD 135344B - SAO 206462
Dong, Ruobing; Baruteau, Clément; Pinte, Christophe +16 more
Planet-disc interactions build up local pressure maxima that may halt the radial drift of protoplanetary dust, and pile it up in rings and crescents. ALMA observations of the HD 135344B disc revealed two rings in the thermal continuum stemming from ~mm-sized dust. At higher frequencies the inner ring is brighter relative to the outer ring, which i…
Extragalactic Magnetism with SOFIA (Legacy Program). I. The Magnetic Field in the Multiphase Interstellar Medium of M51
Beckman, John E.; Tram, Le Ngoc; Hughes, Annie +18 more
The recent availability of high-resolution far-infrared (FIR) polarization observations of galaxies using HAWC+/SOFIA has facilitated studies of extragalactic magnetic fields in the cold and dense molecular disks. We investigate whether any significant structural differences are detectable in the kiloparsec-scale magnetic field of the grand design…
Magnetic Flux and Magnetic Nonpotentiality of Active Regions in Eruptive and Confined Solar Flares
Veronig, Astrid M.; Hou, Yijun; Li, Ting +3 more
With the aim of understanding how the magnetic properties of active regions (ARs) control the eruptive character of solar flares, we analyze 719 flares of Geostationary Operational Environmental Satellite (GOES) class ≥C5.0 during 2010-2019. We carry out the first statistical study that investigates the flare-coronal mass ejection (CME) associatio…
Double- and Triple-line Spectroscopic Candidates in the LAMOST Medium-Resolution Spectroscopic Survey
Fu, Jian-Ning; Hou, Yong-Hui; Li, Chun-qian +3 more
The LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS) provides an unprecedented opportunity for detecting multiline spectroscopic systems. Based on the cross correlation function and successive derivatives, we search for spectroscopic binaries and triples and derive their radial velocities (RVs) from the LAMOST-MRS spectra. A Monte Carlo …
The stellar distribution function and local vertical potential from Gaia DR2
Widrow, Lawrence M.; Li, Haochuan
We develop a novel method to simultaneously determine the vertical potential, force, and stellar z-vz phase space distribution function (DF) in our local patch of the Galaxy. We assume that the Solar Neighbourhood can be treated as a one-dimensional (1D) system in dynamical equilibrium and directly fit the number density in the z-v…
An ALMA Survey of Protoplanetary Disks in Lynds 1641
Fischer, William J.; Calvet, Nuria; Megeath, S. Thomas +8 more
We present ALMA observations of 101 protoplanetary disks within the star-forming region Lynds 1641 in the Orion Molecular Cloud A. Our observations include 1.33 mm continuum emission and spectral windows covering the J = 2-1 transition of 12CO, 13CO, and C18O. We detect 89 protoplanetary disks in the dust continuum…