Search Publications
The Accreting White Dwarfs in Cataclysmic Variables
Sion, Edward M.; Godon, Patrick
Accreting white dwarfs (WDs) in cataclysmic variables (CVs) provide crucial insights about the accretion of mass and angular momentum in all types of binaries, including accreting NSs and BHs. Accreting WDs are the critical component in the single degenerate pathway to SNe Ia, along with the double degenerate merger pathway, they are the standard …
Fragment Dynamics in Active Asteroid 331P/Gibbs
Jewitt, David; Hui, Man-To
We present a dynamical analysis of the fragmented active asteroid 331P/Gibbs. Using archival images taken by the Hubble Space Telescope from 2015 to 2018, we measured the astrometry of the primary and the three brightest (presumably the largest) components. Conventional orbit determination revealed a high degree of orbital similarity between the c…
Thermophysical and Compositional Properties of Paleobedforms on Mars
Chojnacki, Matthew; Fenton, Lori K.; Piqueux, Sylvain +4 more
Bedforms on Earth and Mars are often preserved in the rock record in the form of sedimentary rock with distinct cross-bedding. On rare occasions, the full-surface geometry of a bedform can be preserved through burial and lithification. These features, known as paleobedforms, are found in a variety of geographic locations on Mars. Evidence in the m…
The local universe in the era of large surveys - II. multi-wavelength characterization of activity in nearby S0 galaxies
del Olmo, A.; Jiménez-Palau, C.; Solanes, J. M. +2 more
This is the second paper in a series using data from tens of thousands S0 galaxies of the local Universe (z ≲ 0.1) retrieved from the NASA-Sloan Atlas. It builds on the outcomes of the previous work, which introduced a new classification scheme for these objects based on the principal component analysis (PCA) of their optical spectrum and its proj…
Faint Stars in a Faint Galaxy. II. The Low-mass Stellar Initial Mass Function of the Boötes I Ultrafaint Dwarf Spheroidal Galaxy
Wyse, Rosemary F. G.; Kozhurina-Platais, Vera; Platais, Imants +1 more
This paper presents improved constraints on the low-mass stellar initial mass function (IMF) of the Boötes I (Boo I) ultrafaint dwarf galaxy, based on our analysis of recent deep imaging from the Hubble Space Telescope. The identification of candidate stellar members of Boo I in the photometric catalog produced from these data was achieved using a…
The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age
Klement, Robert; Monnier, John D.; Schaefer, Gail H. +16 more
We observe the brightest member of the Praesepe cluster, ϵ Cnc, to precisely measure the characteristics of the stars in this binary system, en route to a new measurement of the cluster's age. We present spectroscopic radial velocity measurements and interferometric observations of the sky-projected orbit to derive the masses, which we find to be …
Theoretical mass-luminosity relations in Gaia G-band
Malkov, Oleg; Kovaleva, Dana; Zhukov, Aleksandr +1 more
We have analyzed the retrieval of the relation between mass and absolute Gaia G magnitude as obtained from theoretical models by Bressan et al. (Mon. Not. R. Astron. Soc. 427:127, 2012) for the stars of different luminosity classes. For subgiant and main-sequence stars, we provide approximate analytical direct and inverse relations based on the mo…
Globular Cluster UVIT Legacy Survey (GlobULeS). III. Omega Centauri in Far-ultraviolet
Dalessandro, Emanuele; Rao, N. Kameswara; Hutchings, John +21 more
We present the first comprehensive study of the most massive globular cluster, Omega Centauri, in the far-ultraviolet (FUV), extending from the center to ~28% of the tidal radius using the Ultraviolet Imaging Telescope on board AstroSat. A comparison of the FUV-optical color-magnitude diagrams with available canonical models reveals that horizonta…
Consolidation of the Gaia catalogue with Chinese Space Station Telescope astrometry
Lattanzi, M.; Busonero, D.; Cancelliere, R. +4 more
The issue of preservation and improvement of the Gaia catalogue throughout the next few decades is addressed. The goal of this paper is to evaluate the feasibility of astrometric parameter update, for objects already in the catalogue, by inclusion of new observations from other space missions, in particular CSST. The proposed approach consists in …
Magnetohydrodynamic Simulation of Multiple Coronal Mass Ejections: An Effect of "Pre-events"
Wood, Brian E.; Wu, Chin-Chun; Liou, Kan +1 more
Coronal mass ejections (CMEs) are a major source of solar wind disturbances that affect the space plasma and magnetic field environment along their propagation path. Accurate prediction of the arrival of a CME at Earth or any point in the heliosphere is still a daunting task. In this study we explore an often overlooked factor-the effects of "pre-…