Search Publications
COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf
Magnier, Eugene A.; Shappee, Benjamin J.; Morley, Caroline V. +5 more
We present the third discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) program, the COCONUTS-3 system, composed of the young M5 primary star UCAC4 374-046899 and the very red L6 dwarf WISEA J081322.19-152203.2. These two objects have a projected separation of $61^{\prime\prime} $ (1891 au) and are physically associated given their …
Impact ionization dust detection with compact, hollow and fluffy dust analogs
Srama, R.; Pommerol, A.; Hornung, K. +14 more
Impact ionization of high-velocity cosmic dust particles has been used as a basic principle for dust detectors in space for many decades. It has provided optimum means to gain insight into the dust environment in the solar system. The Ulysses Dust Detector System provided for the first time impact ionization-based detection of interstellar dust (I…
XMM-Newton discovery of very high obscuration in the candidate supergiant fast X-ray transient AX J1714.1-3912
Sidoli, L.; Esposito, P.; Polletta, M. +2 more
We have analysed an archival XMM-Newton EPIC observation that serendipitously covered the sky position of a variable X-ray source AX J1714.1-3912, previously suggested to be a supergiant fast X-ray transient (SFXT). During the XMM-Newton observation the source is variable on a time-scale of hundred seconds and shows two luminosity states, with a f…
Timing and spectral studies of the X-ray pulsar 2S 1417–624 during the outburst in 2021
Mandal, Manoj; Pal, Sabyasachi
We study the timing and spectral properties of the X-ray pulsar 2S 1417–624 during the recent outburst in January 2021 based on the Neutron Star Interior Composition Explorer (NICER) observation. We also used some early data from the 2018 outburst to compare different temporal and spectral properties. The evolution of the spin period and pulsed fl…
The Star Formation-Gas Density Relation in Four Galactic GMCs: Effects of Stellar Feedback
Bieging, John H.; Kong, Shuo
We present maps of four Galactic giant molecular clouds (GMCs) in the J = 2-1 emission of both CO and 13CO. We use an LTE analysis to derive maps of the CO excitation temperature and column density and the distribution of total molecular gas column density, Σgas. The depletion of CO by freeze-out onto cold dust grains is acco…
A probabilistic method for detecting solar-like oscillations using meaningful prior information. Application to TESS 2-minute photometry
Chaplin, W. J.; Davies, G. R.; Nielsen, M. B. +2 more
Context. Current and future space-based observatories such as the Transiting Exoplanet Survey Satellite (TESS) and PLATO are set to provide an enormous amount of new data on oscillating stars, and in particular stars that oscillate similar to the Sun. Solar-like oscillators constitute the majority of known oscillating stars and so automated analys…
Constraining Global Solar Models through Helioseismic Analysis
Kosovichev, Alexander G.; Stejko, Andrey M.; Guerrero, Gustavo +4 more
Global hydrodynamic simulations of internal solar dynamics have focused on replicating the conditions for solar-like (equator rotating faster than the poles) differential rotation and meridional circulation using the results of helioseismic inversions as a constraint. Inferences of meridional circulation, however, have provided controversial resul…
The mid-infrared aliphatic bands associated with complex hydrocarbons
Peeters, E.; Sloan, G. C.; Stock, D. J. +2 more
Context. The mid-infrared emission features commonly attributed to polycyclic aromatic hydrocarbons (PAHs) vary in profile and peak position. These profile variations form the basis of their classification: Classes A, B, C reflect profiles with increasing central wavelength while Class D has similar central wavelength as Class B but a similar broa…
The Mysterious Affair of the H2 in AU Mic
France, Kevin; Youngblood, Allison; Johns-Krull, Christopher M. +8 more
Molecular hydrogen is the most abundant molecule in the galaxy and plays important roles in planets, their circumstellar environments, and many of their host stars. We have confirmed the presence of molecular hydrogen in the AU Mic system using high-resolution FUV spectra from HST-STIS during both quiescence and a flare. AU Mic is a ~23 Myr M dwar…
Chemical composition of the young massive cluster NGC 1569-B
Larsen, S. S.; Beasley, M. A.; Brodie, J. +1 more
Context. The chemical composition of young massive clusters (YMCs) provides stellar population information on their host galaxy. As potential precursors of globular clusters (GCs), their properties can help us understand the origins of GCs and their evolution.
Aims: We present a detailed chemical abundance analysis of the YMC NGC 1569-B. The …