Search Publications
A survey of deuterated ammonia in the Cepheus star-forming region L1251
Di Francesco, James; Keown, Jared; Shirley, Yancy L. +4 more
Understanding the chemical processes during starless core and prestellar core evolution is an important step in understanding the initial stages of star and disc formation. This project is a study of deuterated ammonia, o-NH2D, in the L1251 star-forming region towards Cepheus. Twenty-two dense cores (20 of which are starless or prestell…
Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6
Gustafsson, Annika; Christensen, Eric; Micheli, Marco +13 more
Asteroid pairs are genetically related asteroids that recently separated (<few million years), but still reside on similar heliocentric orbits. A few hundred of these systems have been identified, primarily in the asteroid main belt. Here, we studied a newly discovered pair of near-Earth objects (NEOs): 2019 PR2 and 2019 QR6. Based on broad-ban…
Multiresolution angular momentum measurements of z 1.5-2 star-forming galaxies
Glazebrook, Karl; Fisher, Deanne B.; Obreschkow, Danail +5 more
We present detailed stellar specific angular momentum (j*) measurements of 10 star-forming galaxies at z ~ 1.5-2, using both high and low spatial resolution integral field spectroscopic data. We developed a code that simultaneously models the adaptive optics (AO) assisted observations from OSIRIS/SINFONI along with their natural seeing …
GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline
Kumar, Brajesh; De, Kishalay; Sharma, Yashvi +17 more
S190426c/GW190426_152155 was the first probable neutron star-black hole merger candidate detected by the LIGO-Virgo Collaboration. We undertook a tiled search for optical counterparts of this event using the 0.7-m GROWTH-India Telescope. Over a period of two weeks, we obtained multiple observations over a 22.1 deg2 area, with a 17.5 per…
Discovery of quasi-periodic oscillations in the persistent X-ray emission of accreting binary X-ray pulsar LMC X-4
Paul, Biswajit; Paul, K. T.; Rikame, Ketan +1 more
We report the discovery of quasi-periodic oscillations (QPOs) in the high-mass X-ray binary (HMXB) pulsar LMC X-4 in its non-flaring (persistent) state using observations with XMM-Newton. In addition to the 74 mHz coherent pulsations, the persistent emission light curve shows a QPO feature in the frequency range of 20-30 mHz. Quasi-periodic flares…
Combining Rosetta's GIADA and MIDAS data: morphological versus dynamical properties of dust at 67P/Churyumov-Gerasimenko
Lasue, J.; Fulle, M.; Della Corte, V. +10 more
We related morphological (size/shape) and dynamical properties of the dust ejected from the 67P/Churyumov-Gerasimenko comet by combining data from two instruments onboard the ESA's Rosetta mission, i.e. the MIDAS atomic force microscope and the GIADA dust detector. The two instruments detected dust of different size (10-6-10-5
A survey for variable young stars with small telescopes - V. Analysis of TX Ori, V505 Ori, and V510 Ori, the HST ULLYSES targets in the σ Ori cluster
Eislöffel, Jochen; Hambsch, Franz-Josef; Froebrich, Dirk +2 more
Investigations of the formation of young stellar objects (YSOs) and planets require the detailed analysis of individual sources as well as statistical analysis of a larger number of objects. The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) project provides such a unique opportunity by establishing a UV spectroscopic lib…
A chemical analysis of seven red giants of the Galactic cluster NGC 4349
Pereira, C. B.; Holanda, N.; Ramos, André A. +2 more
In this study, we undertake a comprehensive investigation of seven red giant stars of NGC 4349 (#005, #009, #079, #127, #168, #174, and #203) and one non-member star (#053). Accurate abundances of 19 chemical species and 12C/13C isotopic ratio are determined using high-signal-to-noise FEROS spectra and standard spectroscopic …
Revealing the dust grain polarization properties as a function of extinction and distance towards NGC 1893
Jose, Jessy; Wang, Jia-Wei; Lai, Shih-Ping +5 more
Dust polarization observations at optical wavelengths help us to understand the dust grain properties and trace the plane-of-the-sky component of the magnetic field. In this study, we make use of the I-band polarization data acquired from AIMPOL along with the distances (d) and extinction (AV) data to study the variation of polarization…
The pre-He white dwarfs in eclipsing binaries - III. WASP 1625-04
Hong, Kyeongsoo; Lee, Jae Woo; Park, Jang-Ho
1SWASP J162545.15-043027.9 (WASP 1625-04) has been announced as one of EL CVn candidates showing total primary eclipses and ellipsoidal variations. This paper presents the absolute properties of the binary star, based on our high-resolution spectroscopy conducted from 2015 through 2020. From the spectral analysis, the radial velocities (RVs) for b…