Search Publications
CAPOS: The bulge Cluster APOgee Survey. II. The intriguing "Sequoia" globular cluster FSR 1758
Cohen, Roger E.; Beers, Timothy C.; Minniti, Dante +16 more
We present results from a study of 15 red giant members of the intermediate-metallicity globular cluster (GC) FSR 1758 using high-resolution, near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2) that were obtained as part of CAPOS (the bulge Cluster APOgee Survey). Since its very rece…
Long-term stellar activity variations and their effect on radial-velocity measurements
Günther, Maximilian N.; Jenkins, James S.; Watson, Christopher A. +8 more
Long-term stellar activity variations can affect the detectability of long-period and Earth-analogue extrasolar planets. We have, for 54 stars, analysed the long-term trend of five activity indicators: log $R^{\prime }_\mathrm{{HK}}$, the cross-correlation function (CCF) bisector span, CCF full-width-at-half-maximum, CCF contrast, and the area of …
Long-term Coherent Timing of the Accreting Millisecond Pulsar IGR J17062-6143
Bult, Peter; Malacaria, Christian; Ng, Mason +2 more
We report on a coherent timing analysis of the 163 Hz accreting millisecond X-ray pulsar IGR J17062-6143. Using data collected with the Neutron Star Interior Composition Explorer and XMM-Newton, we investigated the pulsar evolution over a time span of four years. We obtained a unique phase-coherent timing solution for the stellar spin, finding the…
Reproducing the UVJ Color Distribution of Star-forming Galaxies at 0.5 < z < 2.5 with a Geometric Model of Dust Attenuation
Belli, Sirio; Tacchella, Sandro; Leja, Joel +1 more
We analyze the distribution of rest-frame U - V and V - J colors for star-forming galaxies at 0.5 < z < 2.5. Using stellar population synthesis, stochastic star formation histories, and a simple prescription for the dust attenuation that accounts for the shape and inclination of galaxies, we construct a model for the distribution of galaxy c…
Estimates of the change rate of solar mass and gravitational constant based on the dynamics of the Solar System
Pitjeva, E. V.; Pitjev, N. P.; Pavlov, D. A. +1 more
The estimate of the change rate of the solar gravitational parameter d(GM⊙)∕dt is obtained from processing modern positional observations of planets and spacecraft. Observations were processed and parameters were determined basing on the numerical planetary ephemeris EPM2019. The obtained annual decrease in solar mass M⊙ acco…
The Composition of the South Polar Cap of Mars Derived From Orbital Data
Wieczorek, M. A.; Broquet, A.; Fa, W.
The flexure of the lithosphere under stresses imposed by the geologically young south polar cap is one of the few clues we have regarding the south polar cap composition and the present-day thermal state of Mars. Here, we combine radar, gravity, and topography data with a flexural loading model to estimate the bulk density (ρ) and average real die…
Evolution of anisotropic turbulence in the fast and slow solar wind: Theory and Solar Orbiter measurements
Fedorov, A.; Horbury, T. S.; Louarn, P. +8 more
Aims: Solar Orbiter (SolO) was launched on February 9, 2020, allowing us to study the nature of turbulence in the inner heliopshere. We investigate the evolution of anisotropic turbulence in the fast and slow solar wind in the inner heliosphere using the nearly incompressible magnetohydrodynamic (NI MHD) turbulence model and SolO measurements…
Parker Solar Probe observations of He/H abundance variations in SEP events inside 0.5 au
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +24 more
Aims: The Parker Solar Probe (PSP) orbit provides an opportunity to study the inner heliosphere at distances closer to the Sun than previously possible. Due to the solar minimum conditions, the initial orbits of PSP yielded only a few solar energetic particle (SEP) events for study. Recently during the fifth orbit, at distances from 0.45 to 0…
The distribution of open clusters in the Galaxy
Monteiro, Hektor; Barros, Douglas A.; Lépine, Jacques R. D. +1 more
In this work we explore the new catalog of galactic open clusters that became available recently, containing 1750 clusters that have been re-analysed using the Gaia DR2 catalog to determine the stellar memberships. We used the young open clusters as tracers of spiral arms and determined the spiral pattern rotation speed of the Galaxy and the corot…
Characteristics of the Basal Interface of the Martian South Polar Layered Deposits
Plaut, Jeffrey J.; Khuller, Aditya R.
We expand on previous studies of the South Polar Layered Deposits' (SPLD) basal interface using data acquired by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) to obtain detailed maps of elevation, topography, and reflected radar power. Using these maps, we derive the thickness (ranging from 0 to 3.7 km) and volume of the…