Search Publications
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 …
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:…
CHIMPS2: 13CO J = 3→2 emission in the central molecular zone
Moore, T. J. T.; Rigby, A. J.; Longmore, S. N. +12 more
We present the initial data for the $(J = 3 \rightarrow 2)$ transition of $^{13}\text{CO}$ obtained from the central molecular zone (CMZ) of the Milky Way as part of the CO Heterodyne Inner Milky Way Plane Survey 2 (CHIMPS2). Covering $359^{\circ } \le l \le 1^{\circ }$ and $|b| \le 0.5^{\circ }$ with an angular resolution of 19 arcsec, velocity r…
Spectroscopic observations of selected planetary nebulae from the HASH data base
Temiz, Utkan; Aksaker, Nazım; Akyuz, Aysun
We conducted research on the classification and physical properties of 10 objects from the HASH [Hong Kong/Australian Astronomical Observatory/Strasbourg Observatory H-alpha Planetary Nebula (PN)] data base with small angular sizes (<8 arcsec) in the Northern hemisphere. The sample consisted of six Likely PNe, two new candidates, one emission-l…
Long-term monitoring of the Oe star VES 735: Ope! not so quiet after all
Kerton, C. R.; Marshall, Brandon
Only 3-4 per cent of Galactic O stars are observed to display the emission features representative of the OBe phenomenon, compared to Galactic B stars, which display these characteristics in 25-35 per cent of B0 and B1 stars. We present new observations of the high-mass O star, VES 735, which confirms its classification as one of these rare emissi…
Wide-binary eccentricity distribution in young star clusters: dependence on the binary separation and mass
Federrath, Christoph; Hu, Yue; Xu, Siyao +2 more
We study the wide-binary eccentricity (e) distribution in young star clusters and the role of turbulence in setting the form of the e distribution using magnetohydrodynamical simulations of star cluster formation. The simulations incorporate gravity, turbulence, magnetic fields, protostellar heating, and jets/outflows. We find that (1) simulations…
MUSE-ALMA Haloes X: the stellar masses of gas-rich absorbing galaxies
Hayes, M.; Kacprzak, G. G.; Kuntschner, H. +13 more
The physical processes by which gas is accreted onto galaxies, transformed into stars, and then expelled from galaxies are of paramount importance to galaxy evolution studies. Observationally constraining each of these baryonic components in the same system, however, is challenging. Furthermore, simulations indicate that the stellar mass of galaxi…
Dust-dust collisions in cometary comas: applications to comet 67P/Churyumov-Gerasimenko
Planes, María Belén; Parisi, M. Gabriela; Millán, Emmanuel N. +2 more
Silica has emerged as a crucial component within inner comet comas. This work investigates silica dust aggregates and their interactions within cometary comas. We study the probability that aggregates in the size range 1-100 µm collide with each other in the coma and analyse the outcomes of such collisions by using the 'Collision of Porous Aggrega…
Comparing dark matter and MOND hyphotheses from the distribution function of A, F, early-G stars in the solar neighbourhood
Arifyanto, M. I.; Syaifudin, M. A.; Wulandari, H. R. T. +1 more
Dark matter is hypothetical matter assumed to address the historically known as missing mass problem in galaxies. However, alternative theories, such as Modified Newtonian Dynamics (MOND), have been notably successful in explaining the missing mass problem in various astrophysical systems. The vertical distribution function of stars in the solar n…
Searching for planet-driven dust spirals in ALMA visibilities
Clarke, Cathie J.; Booth, Richard A.; Ribas, Álvaro +2 more
Atacama Large Millimetre/submillimetre Array (ALMA) observations of the thermal emission from protoplanetary disc dust have revealed a wealth of substructures that could evidence embedded planets, but planet-driven spirals, one of the more compelling lines of evidence, remain relatively rare. Existing works have focused on detecting these spirals …