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India's First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope
Angchuk, Dorje; De, Kishalay; Fremling, Christoffer +35 more
We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0.°82 field of view and a sensitivity of m g' ~ 20.5 in 5 minute exposures. Custom software handles observatory operations: attaining …
RR Lyrae and Type II Cepheid Variables in Globular Clusters: Optical and Infrared Properties
Bhardwaj, Anupam
Globular clusters are both primary fossils of galactic evolution and formation and are ideal laboratories for constraining the evolution of low-mass and metal-poor stars. RR Lyrae and type II Cepheid variables are low-mass, radially pulsating stars that trace old-age stellar populations. These stellar standard candles in globular clusters are cruc…
Five young δ Scuti stars in the Pleiades seen with Kepler/K2
Li, Yaguang; Bedding, Timothy R.; White, Timothy R. +4 more
We perform mode identification for five δ Scuti stars in the Pleiades star cluster, using custom light curves from K2 photometry. By creating échelle diagrams, we identify radial and dipole mode ridges, comprising a total of 28 radial and 16 dipole modes across the five stars. We also suggest possible identities for those modes that lie offset fro…
Stellar and black hole assembly in z < 0.3 infrared-luminous mergers: intermittent starbursts versus super-Eddington accretion
Lebouteiller, Vianney; Pearson, Chris; Clements, David L. +20 more
We study stellar and black hole mass assembly in a sample of 42 infrared-luminous galaxy mergers at z < 0.3 by combining results from radiative transfer modelling with archival measures of molecular gas and black hole mass. The ratios of stellar mass, molecular gas mass, and black hole mass to each other are consistent with those of massive gas…
Transverse Coronal-Loop Oscillations Induced by the Non-radial Eruption of a Magnetic Flux Rope
Li, D.; Zhang, Q. M.; Lu, L. +2 more
We investigate the transverse coronal-loop oscillations induced by the eruption of a prominence-carrying flux rope on 7 December 2012. The flux rope, originating from NOAA Active Region (AR) 11621, was observed in extreme-ultraviolet (EUV) wavelengths by the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) spacecraft…
A proper motion catalogue for the Milky Way's nuclear stellar disc
Nogueras-Lara, F.; Gallego-Calvente, A. T.; Gallego-Cano, E. +5 more
We present the results of a large-scale proper motion study of the central ∼36′ × 16′ of the Milky Way, based on our high angular resolution GALACTICNUCLEUS survey (epoch 2015) combined with the HST Paschen-α survey (epoch 2008). Our catalogue contains roughly 80 000 stars, an unprecedented kinematic dataset for this region. We describe the data a…
Propagation characteristics of coronal mass ejections (CMEs) in the corona and interplanetary space
Wang, Yuming; Shen, Fang; Shen, Chenglong +3 more
Coronal mass ejections (CMEs) play an important role in space weather. The propagation characteristics of CMEs in the Corona and interplanetary space determine whether, when and how the CME will hit the Earth. To this end, a lot of progress has been made both on observational and numerical studies of CMEs. With the development of the advanced obse…
MHD Turbulent Power Anisotropy in the Inner Heliosphere
Zank, G. P.; Zhao, L. -L.; Telloni, D. +1 more
We study anisotropic magnetohydrodynamic (MHD) turbulence in the slow solar wind measured by Parker Solar Probe (PSP) and Solar Orbiter (SolO) during its first orbit from the perspective of variance anisotropy and correlation anisotropy. We use the Belcher & Davis approach (M1) and a new method (M2) that decomposes a fluctuating vector into pa…
Precise Dynamical Masses of ɛ Indi Ba and Bb: Evidence of Slowed Cooling at the L/T Transition
Dupuy, Trent J.; Brandt, Timothy D.; Li, Yiting +3 more
We report individual dynamical masses of 66.92 ± 0.36 M Jup and 53.25 ± 0.29 M Jup for the binary brown dwarfs ɛ Indi Ba and Bb, measured from long-term (≈10 yr) relative orbit monitoring and absolute astrometry monitoring data on the Very Large Telescope (VLT). Relative astrometry with NACO fully constrains the Keplerian orb…
Improving blazar redshift constraints with the edge of the Ly α forest: 1ES 1553+113 and implications for observations of the WHIM
Narayanan, A.; Sameer; Charlton, J. +6 more
Blazars are some of the brightest ultraviolet (UV) and X-ray sources in the sky and are valuable probes of the elusive warm-hot intergalactic medium (WHIM; T ≃ 105-107 K). However, many of the brightest blazars - called BL Lac objects such as 1ES 1553+113 - have quasi-featureless spectra and poorly constrained redshifts. Here…