Search Publications
The puzzling north polar region of Uranus: Continued zero-shear winds and increasing brightness from 2015 through 2022 according to 7 years of Keck AO imaging
de Pater, Imke; Sromovsky, Lawrence A.; Fry, Patrick M. +1 more
There may be a permanent north–south asymmetry in the zonal wind profile of Uranus. According to high signal-to-noise near-IR observations with the Keck telescope NIRC2 camera, through 2014 the winds north of 60∘N had a constant (zero shear) longitudinal drift rate of 4.1∘/h westward (Sromovsky et al., 2015). Yet the south polar winds in 1986 had …
Near-ultraviolet radiation toward molecular cloud N4 in W 50/SS 433: Evidence for direct interaction of the jet with molecular cloud
Takeuchi, Tsutomu T.; Yamamoto, Hiroaki; Ishikawa, Tatsumi
We compared the molecular clouds in the western part of SS 433 with near-ultraviolet radiation data obtained from GALEX. Near-ultraviolet radiation is prominently confirmed toward only N4, while no near-ultraviolet radiation is detected toward N1, N2, or N3. The radiative region of near-ultraviolet radiation is nearly the same as the CO-emitting r…
Short-period post-common envelope binaries with Balmer emission from SDSS and LAMOST based on ZTF photometric data
Li, Lifang; Zhang, Fenghui
We present here 55 short-period post-common envelope binaries (PCEBs) containing a hot white dwarf (WD) and a low-mass main sequence (MS). Based on the photometric data from Zwicky Transient Facility survey data Release 19 (ZTF DR19), the light curves are analysed for about 200 WDMS binaries with emission line(s) identified from the Sloan Digital …
Instabilities of the Kinematic State of the Atmospheres of Single C-Rich Post-AGB Stars
Klochkova, V. G.; Panchuk, V. E.; Yushkin, M. V. +1 more
To search for and study the instabilities in the atmospheres of selected post-AGB stars, we have performed a long-term high-resolution spectroscopy (
Observation of the Southern Polar cap during MY34-36 with ExoMars-TGO NOMAD LNO
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +12 more
Mainly designed to study minor atmospheric species in the Martian atmosphere, the Nadir and Occultation for MArs Discovery (NOMAD) instrument suite onboard the 2016 ExoMars Trace Gas Orbiter (TGO) can also be exploited for surface ice detection. In this work, we investigate the nadir observations of the NOMAD infrared channel from the Martian Year…
Parkes Radio and NuSTAR X-Ray Observations of the Composite Supernova Remnant B0453–685 in the Large Magellanic Cloud
Acero, Fabio; Ballet, Jean; Kerr, Matthew +9 more
Gamma-ray emission is observed coincident in position to the evolved, composite supernova remnant (SNR) B0453–685. Prior multiwavelength investigations of the region indicate that the pulsar wind nebula (PWN) within the SNR is the most likely origin for the observed gamma rays, with a possible pulsar contribution that becomes significant at energi…
Kinematic Insights into Luminous Blue Variables and B[e] Supergiants
Oey, M. S.; Deman, Julian A.
Recent work suggests that many luminous blue variables (LBVs) and B[e] supergiants (sgB[e]) are isolated, implying that they may be products of massive binaries, kicked by partner supernovae. However, the evidence is somewhat complex and controversial. To test this scenario, we measure the proper-motion velocities for these objects in the LMC and …
Abnormal Stokes V profiles observed by Hinode in a sunspot: Detection of hidden photospheric fine-structures
Rezaei, R.; Hamedivafa, H.
Context. Hidden magnetic components in a sunspot are present as small-scale structures that are absent in low-resolution observations. Aims. We search for traces of the hidden magnetic components in spectro-polarimetric observations of a mature sunspot close to the disk center recorded by Hinode. Methods. To find extra humps in the far blue and re…
Low-resolution transit spectroscopy of three hot Jupiters using the 2 m Himalayan Chandra Telescope
Sivarani, Thirupathi; Oza, Apurva V.; Goyal, Jayesh +3 more
Here, we present the low-resolution transmission spectroscopy of three giant planets using the Himalayan Faint Object Spectrograph Camera (HFOSC) on the 2 m Himalayan Chandra Telescope (HCT) in Hanle, India. It is the first application of transmission spectroscopy with HCT. This study presents results from a single transit, each for three planets:…
The return of FarNet-II: Generation of solar far-side magnetograms from helioseismic data
Asensio Ramos, A.; Felipe, T.; Broock, E. G.
Context. The far-side activity of the Sun can be inferred by interpreting the near-side wave field using local helioseismic techniques. However, detections are limited to strongly active regions because signal-to-noise ratio of the data is low. Recently, we developed the FarNet and FarNet-II neural networks to improve the identification of active …