Martin Kabatnik
A5020621846- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- High-pressure geophysics and materials
- Isotope Analysis in Ecology
- SAS software applications and methods
- Geological and Geochemical Analysis
- Astrophysical Phenomena and Observations
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
Abstract A complete accounting of nearby objects—from the highest-mass white dwarf progenitors down to low-mass brown dwarfs—is now possible, thanks an almost set trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census objects within Sun-centered sphere 20 pc radius check published literature decompose each binary or higher-order system into its separate components. The result is volume-limited ∼3600 individual star formation products...
Abstract We report the results of a spectroscopic survey candidate T subdwarfs identified by Backyard Worlds: Planet 9 program. Near-infrared spectra 31 sources with red J − W2 colors and large -band reduced proper motions show varying signatures subsolar metallicity, including strong collision-induced H 2 absorption, obscured methane water features, weak K i absorption. These metallicity are supported spectral model fits 3D velocities, indicating thick disk halo population membership for...
We present the discovery of CWISE J050626.96$+$073842.4 (CWISE J0506$+$0738), an L/T transition dwarf with extremely red near-infrared colors discovered through Backyard Worlds: Planet 9 citizen science project. Photometry from UKIRT and CatWISE give a $(J-K)_{\rm MKO}$ color 2.97$\pm$0.03 mag $J_{\rm MKO}-$W2 4.93$\pm$0.02 mag, making J0506$+$0738 reddest known free-floating in both colors. confirm nature using Keck/NIRES spectroscopy establish that it is low-gravity late-type dwarf. The...
Abstract We report the identification of 89 new systems containing ultracool dwarf companions to main-sequence stars and white dwarfs, using citizen science project Backyard Worlds: Planet 9 cross-reference between Gaia CatWISE2020. 32 these 33 host were followed up with spectroscopic observations, companion spectral types ranging from M7–T9 G2–M9. These exhibit diverse characteristics, young old ages, blue very red morphologies, potential membership known moving groups, evidence binarity in...
Abstract We present the discovery of 13 new widely separated T dwarf companions to M primaries, identified using Wide-field Infrared Survey Explorer/NEOWISE data by CatWISE and Backyard Worlds: Planet 9 projects (hereafter BYW). This sample represents an ∼60% increase in number known + systems, allows us probe most extreme products binary/planetary system formation, a space made available CatWISE2020 catalog BYW effort. Highlights among are WISEP J075108.79-763449.6, previously T9 thought be...
Abstract We report the discovery of a high-velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to Milky Way. CWISE J124909.08+362116.0 was identified by citizen scientists in Backyard Worlds: Planet 9 program as high-proper-motion ( μ = 0.″9 yr −1 ) faint red source. Moderate-resolution spectroscopy with Keck/NIRES reveals be metal-poor early L subdwarf large radial velocity (−103 ± 10 km s ), and its estimated distance 125 8 pc yields speed 456 27 Galactic...
Abstract We have used data from the UKIRT Hemisphere Survey to search for substellar members of Hyades cluster. Our recovered several known members, and two brown dwarfs that we suggest may be based on a new kinematic analysis. uncovered thirteen candidates, obtained near-infrared follow-up spectroscopy each with IRTF/SpeX. Six candidates spectral types between M7 L0 are ruled out as potential their photometric distances (≳100 pc). The remaining seven L5 T4, all five showing strong...
Abstract We describe 238 mid-infrared detections of supernovae and 195 possible in co-added images the NEOWISE mission. find one type Ia supernova (SN 2015cp), which has a evolution that is similar to known with long-lived detections. also Ic 2017dio) Ib 2016ajo). Additionally we provide measured magnitudes for most our two transients, suspect be TDEs: ASASSN-18ap ATLAS17jrp.
A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs is now possible, thanks an almost set trigonometric parallax determinations Gaia, ground-based surveys, and Spitzer follow-up. We create a census within Sun-centered sphere 20-pc radius check published literature decompose each binary or higher-order system into its separate components. The result volume-limited $\sim$3,600 individual star formation products useful in...
We present the discovery of 13 new widely separated T dwarf companions to M primaries, identified using WISE/NEOWISE data by CatWISE and Backyard Worlds: Planet 9 projects. This sample represents a $\sim$60% increase in number known M+T systems, allows us probe most extreme products binary/planetary system formation, space made available CatWISE2020 catalog effort. Highlights among are WISEP J075108.79-763449.6, previously T9 thought be old due its SED, which we now find is part...
We have used the UKIRT Hemisphere Survey (UHS) combined with UKIDSS Galactic Cluster (GCS), Plane (GPS), and CatWISE2020 catalog to search for new substellar members of nearest open cluster Sun, Hyades. Eight Hyades candidate were identified observed Gemini/GNIRS near-infrared spectrograph. All eight objects are confirmed as brown dwarfs spectral types ranging from L6 T5, two showing signs binarity and/or variability. A kinematic analysis demonstrates that all discoveries likely belong...
Abstract We have used the UKIRT Hemisphere Survey combined with UKIDSS Galactic Cluster Survey, Plane and CatWISE2020 catalog to search for new substellar members of nearest open cluster Sun, Hyades. Eight Hyades candidate were identified observed Gemini/GNIRS near-infrared spectrograph. All eight objects are confirmed as brown dwarfs spectral types ranging from L6 T5, two showing signs binarity and/or variability. A kinematic analysis demonstrates that all discoveries likely belong cluster,...
Abstract We present the discovery of 118 new ultracool dwarf candidates, discovered using a machine-learning tool, named SMDET , applied to time-series images from Wide-field Infrared Survey Explorer. gathered photometric and astrometric data estimate each candidate’s spectral type, distance, tangential velocity. This sample has photometrically estimated class distribution 28 M dwarfs, 64 L 18 T dwarfs. also identify T-subdwarf candidate, two extreme candidate young Five objects did not have...