Search Publications
Ultraviolet Spectroscopy of Lucy Mission Targets with the Hubble Space Telescope
Emery, Joshua P.; Grundy, Will M.; Humes, Oriel A. +1 more
The recently launched Lucy mission aims to understand the dynamical history of the solar system by examining the Jupiter Trojans, a population of primitive asteroids co-orbital with Jupiter. Using the G280 grism on the Hubble Space Telescope's Wide Field Camera 3, we obtained near-ultraviolet spectra of four of the five Lucy mission targets-(617) …
Young Exoplanet Transit Initiative follow-up observations of the T Tauri star CVSO 30 with transit-like dips
Neuhäuser, R.; Chen, W. P.; Mugrauer, M. +13 more
The T Tauri star CVSO 30, also known as PTFO 8-8695, was studied intensively with ground-based telescopes as well as with satellites over the last decade. It showed a variable light curve with additional repeating planetary transit-like dips every ~10.8 h. However, these dimming events changed in depth and duration since their discovery and from a…
The symbiotic binary St 2-22: Orbital and stellar parameters and jet evolution following its 2019 outburst
Mikołajewska, J.; Iłkiewicz, K.; Monard, B. +3 more
Context. St 2-22 is a relatively poorly studied S-type symbiotic system that belongs to a small group of jet-producing systems as a result of disc accretion onto a white dwarf fed by its red giant companion.
Aims: The goal of this paper is to analyse the nature and derive the basic parameters of St 2-22, and to follow the jet evolution.
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Volcanic craters and cones in central Kachchh mainland, western India: Potential analogue for the Martian studies?
Chavan, Anil; Bhandari, Subhash
Role of Oxygen Ions in the Structure of the Current Sheet of the Near-Earth Magnetotail
Zelenyi, L. M.; Malova, Kh. V.; Mingalev, I. V. +5 more
A numerical model is used to study the possibility of a thin current sheet formation in the near-Earth magnetotail in the growth phase of a substorm for a wide range of parameters of longitudinal countermoving ion flows that create current sheet. The simulation results make it possible to conclude that the current sheet can be formed by oxygen ion…
K2 discovery of a circumsecondary disk transiting EPIC 220208795
Mamajek, E. E.; Kenworthy, M. A.; Pojmański, G. +2 more
Context. Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesise is due to an eclipsing companion surrounded by a tilted and inclined opaque disk, similar to those seen around V928 Tau and EPIC 204376071.
Aims: We aim to derive physical parameters of the disk and orb…
Astrometric and Photometric Standard Candidates for the Upcoming 4-m International Liquid Mirror Telescope Survey
Kumar, Brajesh; Surdej, Jean; Negi, Vibhore +5 more
The International Liquid Mirror Telescope (ILMT) is a 4-m class survey telescope that has recently achieved first light and is expected to swing into full operations by January 1, 2023. It scans the sky in a fixed 22′ wide strip centered at the declination of 29∘21′41′′ and works in Time Delay Integration (TDI) mode. We present a full catalog of s…
Quantifying Chemical and Kinematical Properties of Galactic Disks
Hu, Guozhen; Shao, Zhengyi
We aim to quantify the chemical and kinematical properties of Galactic disks with a sample of 119,558 giant stars having abundances and 3D velocities taken or derived from the APOGEE DR17 and Gaia EDR3 catalogs. A Gaussian mixture model is employed to distinguish the high-α and low-α sequences along the metallicity by simultaneously using chemical…
Extended population associated with W40
Comerón, F.; Schneider, N.; Djupvik, A. A.
Context. W40 is a heavily obscured bipolar HII region projected in the direction of the Aquila Rift and ionized by hot stars in a central, partly embedded cluster. The study of the cluster and its surroundings has been greatly hampered thus far by the strong extinction in the region.
Aims: Our aim is to improve the characterization of the W40…
Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1
Pál, András; Rieke, George H.; Moór, Attila +24 more
Extreme debris discs are characterized by unusually strong mid-infrared excess emission, which often proves to be variable. The warm dust in these discs is of transient nature and is likely related to a recent giant collision occurring close to the star in the terrestrial region. Here we present the results of a 877 d long, gap-free photometric mo…