Search Publications
The enigmatic binary system HD 5980
Hillier, D. John; Morrell, Nidia; Nazé, Yaël +3 more
The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014…
The Atacama Cosmology Telescope: CO(J = 3 - 2) Mapping and Lens Modeling of an ACT-selected Dusty Star-forming Galaxy
Gallardo, Patricio A.; Huffenberger, Kevin M.; Hughes, John P. +13 more
We report Northern Extended Millimeter Array CO(J = 3 - 2) observations of the dusty star-forming galaxy ACT-S J020941+001557 at z = 2.5528, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial survey. Our spatially resolved spectral line data support the derivation of a gravitational lens model from 37 in…
Benchmarking Substellar Evolutionary Models Using New Age Estimates for HD 4747 B and HD 19467 B
Crepp, Justin R.; White, Timothy R.; Brewer, John M. +5 more
Constraining substellar evolutionary models (SSEMs) is particularly difficult due to a degeneracy between the mass, age, and luminosity of a brown dwarf. In cases where a brown dwarf is found as a directly imaged companion to a star, as in HD 4747 and HD 19467, the mass, age, and luminosity of the brown dwarf are determined independently, making t…
A Wide-field Photometric Survey of Globular Clusters in the Peculiar Early-type Galaxy M85
Park, Byeong-Gon; Hwang, Narae; Lee, Myung Gyoon +4 more
We survey globular clusters (GCs) in M85 using ugi-band images of a 1° × 1° field obtained with the MegaCam at the 3.6 m Canada-France-Hawaii Telescope. We identify 1318 GC candidates with 20.0 mag < g 0 < 23.5 mag in the entire survey region. Their radial number density profile is well fit by a Sérsic profile with n = {2.58}…
Multifractal Analysis of Heliospheric Magnetic Field Fluctuations Observed by Ulysses
Bruno, Roberto; Wawrzaszek, Anna; Echim, Marius
We present the multifractal study of the intermittency of the magnetic field turbulence in the fast and slow solar wind beyond the ecliptic plane during two solar minima (1997-1998, 2007-2008) and solar maximum (1999-2001). More precisely, we consider 126 time intervals of Ulysses magnetic field measurements, obtain the multifractal spectra, and e…
On the triple-star origin of the planetary nebula Sh 2-71
Corradi, Romano L. M.; Jones, David; Pejcha, Ondřej
Recent studies have indicated that triple-star systems may play a role in the formation of an appreciable number of planetary nebulae, however, only one triple central star is known to date (and that system is likely too wide to have had much influence on the evolution of its component stars). Here, we consider the possibility that Sh 2-71 was for…
Late-time Observations of the Type Ia Supernova SN 2014J with the Hubble Space Telescope Wide Field Camera 3
Graur, Or
Recent works have studied the late-time light curves of Type Ia supernovae (SNe Ia) when these were older than 500 days past B-band maximum light. Of these, SN 2014J, which exploded in the nearby galaxy M82, was studied with the Advanced Camera for Surveys onboard the Hubble Space Telescope (HST) by Yang et al. Here, I report complementary photome…
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell
Olofsson, H.; Mecina, M.; Kerschbaum, F. +4 more
Aims: The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like structure in thermal dust emission. We investigate the molecular counterpart in high resolution, aiming t…
First detection of oscillations in the Halo giant HD 122563: Validation of seismic scaling relations and new parameters
Andersen, M. F.; Grundahl, F.; Pallé, P. L. +8 more
Aims: The nearby metal-poor giant HD 122563 is an important astrophysical laboratory in which to test stellar atmospheric and interior physics. It is also a benchmark star for which to calibrate methods to apply to large scale surveys. Recently it has been remeasured using various methodologies given the new high precision instruments at our …
The Close AGN Reference Survey (CARS). Discovery of a global [C II] 158 µm line excess in AGN HE 1353-1917
Gaspari, M.; Groves, B.; Combes, F. +15 more
The [C II]λ158 µm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [C II] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [C II] excess with respect…