Search Publications
Missions
Journals
Publication Years
Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection
Sunyaev, R.; Churazov, E.; Bykov, A. M. +2 more
This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in the course of the calibration and performance verification observations. The data cover a ~3° × 3° area around the cluster with a typical exposure time of more than 20 ks. The stability of the instrumental background and operation of the…
Two Contact Binaries with Mass Ratios Close to the Minimum Mass Ratio
Li, Kai; Xia, Qi-Qi; Chen, Xu +5 more
The cutoff mass ratio is under debate for contact binaries. In this paper, we present the investigation of two contact binaries with mass ratios close to the low mass ratio limit. It is found that the mass ratios of VSX J082700.8+462850 (hereafter J082700) and 1SWASP J132829.37+555246.1 (hereafter J132829) are both less than 0.1 (q ~ 0.055 for J08…
Constraints on the presence of platinum and gold in the spectra of the kilonova AT2017gfo
Smartt, S. J.; Sim, S. A.; Gillanders, J. H. +2 more
Binary neutron star mergers are thought to be one of the dominant sites of production for rapid neutron capture elements, including platinum and gold. Since the discovery of the binary neutron star merger GW170817, and its associated kilonova AT2017gfo, numerous works have attempted to determine the composition of its outflowing material, but they…
Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Recalibration of SMSS DR2
Huang, Yang; Ting, Yuan-Sen; Beers, Timothy C. +13 more
We apply the spectroscopy-based stellar-color regression (SCR) method to perform an accurate photometric recalibration of the second data release from the SkyMapper Southern Survey (SMSS DR2). From comparison with a sample of over 200,000 dwarf stars with stellar atmospheric parameters taken from GALAH+ DR3 and with accurate, homogeneous photometr…
Mass, Spin, and Ultralight Boson Constraints from the Intermediate-mass Black Hole in the Tidal Disruption Event 3XMM J215022.4-055108
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +1 more
We simultaneously and successfully fit the multiepoch X-ray spectra of the tidal disruption event (TDE) 3XMM J215022.4-055108 using a modified version of our relativistic slim disk model that now accounts for angular momentum losses from radiation. We explore the effects of different disk properties and of uncertainties in the spectral hardening f…
How robustly can we constrain the low-mass end of the z ∼ 6-7 stellar mass function? The limits of lensing models and stellar population assumptions in the Hubble Frontier Fields
Charlot, Stéphane; Chevallard, Jacopo; Lehnert, Matthew D. +2 more
We present new measurements of the very low mass end of the galaxy stellar mass function (GSMF) at z ~ 6-7 computed from a rest-frame ultraviolet selected sample of dropout galaxies. These galaxies lie behind the six Hubble Frontier Field clusters and are all gravitationally magnified. Using deep Spitzer/IRAC and Hubble Space Telescope imaging, we…
The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-resolution Spectroscopy
Gelino, Christopher R.; Burgasser, Adam J.; Faherty, Jacqueline K. +7 more
We report multiepoch radial velocities, rotational velocities, and atmospheric parameters for 37 T-type brown dwarfs observed with Keck/NIRSPEC. Using a Markov Chain Monte Carlo forward-modeling method, we achieve median precisions of 0.5 and 0.9 km s-1 for radial and rotational velocities, respectively. All of the T dwarfs in our sampl…
A Catalog of Potential Post-Common Envelope Binaries
Kobayashi, Chiaki; Di Stefano, Rosanne; Gao, Yan +2 more
We present a catalog containing 839 candidate post-common envelope systems. Common envelope evolution is very important in stellar astrophysics, particularly in the context of very compact and short-period binaries, including cataclysmic variables, as progenitors of, e.g., supernovae Type Ia or mergers of black holes and/or neutron stars. At the s…
Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328-1219
Vanderburg, Andrew; Hermes, J. J.; Weinberger, Alycia J. +14 more
We present follow-up photometry and spectroscopy of ZTF J0328-1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transient Facility photometry, along with follow-up high-speed photometry from various observatories, we find evidence for two significant periods of variability at 9.937 and 11…
A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B
Ménard, F.; Schmidt, T. O. B.; Ginski, C. +22 more
Context. Young giant planets and brown dwarf companions emit near-infrared radiation that can be linearly polarized up to several percent. This polarization can reveal the presence of an (unresolved) circumsubstellar accretion disk, rotation-induced oblateness of the atmosphere, or an inhomogeneous distribution of atmospheric dust clouds.
Aim…