Search Publications
Non-local thermodynamic equilibrium spectral analysis of five hot, hydrogen-deficient pre-white dwarfs
Raddi, Roberto; Munari, Ulisse; Werner, Klaus +3 more
Hot, compact, hydrogen-deficient pre-white dwarfs (pre-WDs) with effective temperatures of Teff > 70 000 K and a surface gravity of 5.0 < logg < 7.0 are rather rare objects despite recent and ongoing surveys. It is believed that they are the outcome of either single star evolution (late helium-shell flash or late helium-core fl…
Mapping out the Stellar Populations of IC 2602 and IC 2391
Henry, Todd J.; James, Hodari-Sadiki; Jao, Wei-Chun +4 more
IC 2391 and IC 2602 are important benchmarks for testing early star and planet evolution theories, both structural and dynamical, because they are the nearest open clusters with ages of ~50 Myr. We refine membership lists for these clusters by identifying candidate members using Gaia DR2 kinematic and distance information. We identify 451 candidat…
The high-velocity clouds above the disc of the outer Milky Way: misty precipitating gas in a region roiled by stellar streams
Tripp, Todd M.
The high-velocity clouds (HVCs) in the outer Milky Way at 20° < l < 190° have similar spatial locations, metallicities, and kinematics. Moreover, their locations and kinematics are coincident with several extraplanar stellar streams. The HVC origins may be connected to the stellar streams, either stripped directly from them or precipitated b…
XMM-Newton and Swift observations of supergiant high mass X-ray binaries
Romano, P.; Ferrigno, C.; Bozzo, E.
Wind-fed supergiant X-ray binaries are precious laboratories not only to study accretion under extreme gravity and magnetic field conditions, but also to probe the still highly debated properties of massive star winds. These include clumps, originating from the inherent instability of line driven winds, and larger structures. In this paper we repo…
Study of X-Ray Intraday Variability of HBL Blazars Based on Observations Obtained with XMM-Newton
Gupta, Alok C.; Wiita, Paul J.; Jithesh, V. +1 more
We present an extensive study on the X-ray intraday variability of 10 teraelectronvolt-emitting high synchrotron peaked blazars (HBLs): 1ES 0229+200, 1ES 0414+009, PKS 0548-322, 1ES 1101-232, 1H 1219+301, H 1426+428, Mrk 501, 1ES 1959+650, PKS 2005-489, and 1ES 2344+514 made with 25 XMM-Newton pointed observations during its operational period. In…
Thermal Phase Curves of XO-3b: An Eccentric Hot Jupiter at the Deuterium Burning Limit
Deming, Drake; Burrows, Adam; Fortney, Jonathan J. +15 more
We report Spitzer full-orbit phase observations of the eccentric hot Jupiter XO-3b at 3.6 and 4.5 µm. Our new eclipse depth measurements of 1770 ± 180 ppm at 3.6 µm and 1610 ± 70 ppm at 4.5 µm show no evidence of the previously reported dayside temperature inversion. We also empirically derive the mass and radius of XO-3b and its…
Ca II triplet spectroscopy of Small Magellanic Cloud red giants. VI. Analysis of chemical properties of the main body
Geisler, D.; Mauro, F.; Angelo, M. S. +5 more
Aims: In this paper we analyze the chemical evolution of the main body of the SMC, adding six additional clusters to previously published samples, based on homogeneously determined and accurate metallicities.
Methods: We derived radial velocities and Ca II Triplet (CaT) metallicity of more than 150 red giants stars in six SMC star cluste…
The Transformative Journey of HD 93521
Gies, Douglas R.; Shepard, Katherine; Klement, Robert +1 more
HD 93521 is a massive, rapidly rotating star that is located about 1 kpc above the Galactic disk, and the evolutionary age for its estimated mass is much less than the time of flight if it was ejected from the disk. Here we present a reassessment of both the evolutionary and kinematical timescales for HD 93521. We calculate a time of flight of 39 …
Late Amazonian dike-fed distributed volcanism in the Tharsis volcanic province on Mars
Pieterek, Bartosz; Lagain, Anthony; Ciazela, Marta +1 more
Tharsis is the largest volcanic province on Mars and in the solar system. This region includes major volcanoes (Olympus Mons, Alba Mons, Arsia Mons, Pavonis Mons, and Ascraeus Montes) and hundreds of small volcanic cones and vents, whose origin is not yet fully understood. Although the main Tharsis' edifices plumbing system has been extensively st…
An Early Catalog of Planet-hosting Multiple-star Systems of Order Three and Higher
Cuntz, M.; Millard, M. J.; Luke, G. E. +2 more
We present a catalog (status 2022 July 1) of triple and higher-order systems identified containing exoplanets based on data from the literature, including various analyses. We explore statistical properties of the systems with a focus on both the stars and the planets. So far, about 30 triple systems and one to three quadruple systems, including (…