Search Publications
Monitoring Hα Emission from the Wide-orbit Brown-dwarf Companion FU Tau B
Bowler, Brendan P.; Close, Laird M.; Wu, Ya-Lin +5 more
Monitoring mass accretion onto substellar objects provides insights into the geometry of the accretion flows. We use the Lulin One-meter Telescope to monitor Hα emission from FU Tau B, a ~19 M Jup brown-dwarf companion at 5.″7 (719 au) from the host star, for six consecutive nights. This is the longest continuous Hα monitoring for a sub…
Non-universality of the Turbulent Spectra at Sub-ion Scales in the Solar Wind: Dispersive Effects versus the Doppler Shift
Sahraoui, Fouad; Huang, Shiyong
Large surveys of the power spectral density of the magnetic fluctuations in the solar wind have reported different slope distributions at MHD, sub-ion and sub-electron scales: the smaller the scale, the broader the distribution. Here, we review briefly some of the most relevant explanations of the broadening of the slopes at sub-ion scales. Then, …
M dwarf stars in the b294 field from the VISTA Variables in the Vía Láctea (VVV)
Minniti, Dante; Alonso-García, Javier; Saito, Roberto K. +4 more
M dwarf stars are the dominant stellar population in the Milky Way, and they are important for a wide variety of astrophysical topics. The Gaia mission has delivered a superb collection of data, nevertheless, ground-based photometric surveys are still needed to study faint objects. Therefore, the present work aims to identify and characterize M dw…
The magnetic, spectroscopic, and photometric variability of the Wolf-Rayet star WR 55
Hubrig, S.; Cikota, A.; Schöller, M. +2 more
Studies of magnetic fields in the most evolved massive stars, the Wolf-Rayet stars, are of special importance because they are progenitors of certain types of supernovae. The first detection of a magnetic field of the order of a few hundred gauss in the WN7 star WR 55, based on a few FORS2 low-resolution spectropolarimetric observations, was repor…
A Surprising Periodicity Detected during a Super-outburst of V844 Herculis by TESS
Thorstensen, John R.; Garnavich, Peter; Littlefield, Colin +6 more
We identify a previously undetected periodicity at a frequency of 49.08 ± 0.01 days-1 (period of 29.34 ± 0.01 minutes) during a super-outburst of V844 Her observed by TESS. V844 Her is an SU UMa type cataclysmic variable with an orbital period of 78.69 minutes, near the period minimum. The frequency of this new signal is constant in con…
An Introduction of the 3rd Realization of the International Celestial Reference Frame (ICRF3)
Zhu, Zi; Liu, Jia-cheng; Liu, Niu +1 more
The 3rd realization of the International Celestial Reference Frame, ICRF3, has been the latest ICRF (the International Celestial Reference Frame) as the replacement of its previous realization, ICRF2, since January 1, 2019. The ICRF3 is aligned to the ICRS (the International Celestial Reference System) to within the accuracy of the ICRF2. After it…
Into the Mystic: ALMA ACA observations of the Mystic Mountains in Carina
Reiter, Megan; Klaassen, P. D.; McLeod, A. F. +2 more
We present new observations of the Mystic Mountains cloud complex in the Carina Nebula using the ALMA Atacama Compact Array (ACA) to quantify the impact of strong UV radiation on the structure and kinematics of the gas. Our Band 6 observations target CO, 13CO, and C18O; we also detect DCN J=3-2 and 13CS J=5-4. A de…
Exploring the impact of imaging cadence on inferring CME kinematics
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +2 more
The kinematics of coronal mass ejections (CMEs) are crucial for understanding their initiation mechanism and predicting their impact on Earth and other planets. With most of the acceleration and deceleration occurring below 4 R⊙, capturing this phase is vital to better understand their initiation mechanism. Furthermore, the kinematics of CMEs in t…
Far-infrared line emission from the outer Galaxy cluster Gy 3-7 with SOFIA/FIFI-LS: Physical conditions and UV fields
König, C.; Menten, K. M.; Karska, A. +13 more
Context. Far-infrared (FIR) line emission provides key information about the gas cooling and heating due to shocks and UV radiation associated with the early stages of star formation. Gas cooling via FIR lines might, however, depend on metallicity.
Aims: We aim to quantify the FIR line emission and determine the spatial distribution of the CO…
The first photometric and spectroscopic analysis of the neglected totally eclipsing contact binary NSVS 2536063
Wang, Xi; Li, Kai; Xia, Qi-Qi +4 more
We firstly studied the neglected totally eclipsing contact binary NSVS 2536063 using the newly observed g'r'i' light curves of 60 cm Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) and some public data, which come from the Transiting Exoplanet Survey Satellite (TESS), the All-Sky Automated Surv…