Search Publications
The Multiplicity of M Dwarfs in Young Moving Groups
Yee, Jennifer C.; Montet, Benjamin T.; Bowler, Brendan P. +12 more
We image 104 newly identified low-mass (mostly M-dwarf) pre-main sequence (PMS) members of nearby young moving groups (YMGs) with Magellan Adaptive Optics (MagAO) and identify 27 stellar binaries with instantaneous projected separation as small as 40 mas. Fifteen were previously unknown. The total number of multiple systems in this sample includin…
The AB Doradus system revisited: The dynamical mass of AB Dor A/C
Ros, E.; Lestrade, J. -F.; Tognelli, E. +6 more
Context. The study of pre-main-sequence (PMS) stars with model-independent measurements of their masses is essential to check the validity of theoretical models of stellar evolution. The well-known PMS binary AB Dor A/C is an important benchmark for this task, since it displays intense and compact radio emission, which makes possible the applicati…
Bidirectional reflectance and VIS-NIR spectroscopy of cometary analogues under simulated space conditions
Thomas, Nicolas; Fornasier, Sonia; Pommerol, Antoine +7 more
This work is intended to be the second publication in a series of papers reporting on the spectro-photometric properties of cometary analogues measured in the laboratory. Herein, we provide in-situ hyperspectral imaging data in the 0.40-2.35 µm range from three sublimation experiments under simulated space conditions in thermal vacuum from s…
Meet the family - the catalog of known hot subdwarf stars
Gänsicke, Boris T.; Telting, John H.; Østensen, Roy H. +6 more
In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, class…
Discovery of a soft X-ray 8 mHz QPO from the accreting millisecond pulsar IGR J00291+5934
Sanna, A.; Ferrigno, C.; Papitto, A. +7 more
We report on the analysis of the peculiar X-ray variability displayed by the accreting millisecond X-ray pulsar IGR J00291+5934 in a 80 ks-long joint NuSTAR and XMM-Newton observation performed during the source outburst in 2015. The light curve of the source is characterized by a flaring-like behaviour, with typical rise and decay time-scales of …
Data processing pipeline for Herschel HIFI
Shipman, R. F.; Sanchez, E.; Braine, J. +26 more
Context. The HIFI instrument on the Herschel Space Observatory performed over 9100 astronomical observations, almost 900 of which were calibration observations in the course of the nearly four-year Herschel mission. The data from each observation had to be converted from raw telemetry into calibrated products and were included in the Herschel Scie…
Intrinsic scatter of caustic masses and hydrostatic bias: An observational study
Andreon, S.; Moretti, A.; Wang, J. +1 more
All estimates of cluster mass have some intrinsic scatter and perhaps some bias with true mass even in the absence of measurement errors for example caused by cluster triaxiality and large scale structure. Knowledge of the bias and scatter values is fundamental for both cluster cosmology and astrophysics. In this paper we show that the intrinsic s…
Study of the accretion torque during the 2014 outburst of the X-ray pulsar GRO J1744-28
Sanna, A.; Esposito, P.; Segreto, A. +9 more
We present the spectral and timing analysis of the X-ray pulsar GRO J1744-28 during its 2014 outburst using data collected with the X-ray satellites Swift, INTEGRAL, Chandra, and XMM-Newton. We derived, by phase-connected timing analysis of the observed pulses, an updated set of the source ephemeris. We were also able to investigate the spin-up of…
A Redshift Survey of the Nearby Galaxy Cluster Abell 2199: Comparison of the Spatial and Kinematic Distributions of Galaxies with the Intracluster Medium
Hwang, Ho Seong; Park, Changbom; Song, Hyunmi +1 more
We present the results from an extensive spectroscopic survey of the central region of the nearby galaxy cluster Abell 2199 (A2199) at z = 0.03. By combining 775 new redshifts from the MMT/Hectospec observations with the data in the literature, we construct a large sample of 1624 galaxies with measured redshifts at R< 30\prime , whic…
Stellar dynamics in the strong-lensing central galaxy of Abell 1201: a low stellar mass-to-light ratio, a large central compact mass and a standard dark matter halo
Edge, Alastair C.; Lucey, John R.; Smith, Russell J.
We analyse the stellar kinematics of the z = 0.169 brightest cluster galaxy in Abell 1201, using integral field observations acquired with the Multi-Unit Spectroscopic Explorer on the Very Large Telescope. This galaxy has a gravitationally lensed arc located at unusually small radius (∼5 kpc), allowing us to constrain the mass distribution using l…