Search Publications
Selection of Massive Evolved Galaxies at 3 ≤ z ≤ 4.5 in the CANDELS Fields
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +14 more
Using the CANDELS photometric catalogs for the Hubble Space Telescope/ACS and WFC3, we identified massive evolved galaxies at 3 < z < 4.5 employing three different selection methods. We find the comoving number density of these objects to be ∼2 × 10-5 and 8 × 10-6 Mpc-3 after correction for completeness for t…
The TESS-Keck Survey. III. A Stellar Obliquity Measurement of TOI-1726 c
Kristiansen, Martti H.; Batalha, Natalie M.; Latham, David W. +43 more
We report the measurement of a spectroscopic transit of TOI-1726c, one of two planets transiting a G-type star with V = 6.9 in the Ursa Major Moving Group (∼400 Myr). With a precise age constraint from cluster membership, TOI-1726 provides a great opportunity to test various obliquity excitation scenarios that operate on different timescales. By m…
Hard X-Ray Excess from the Magnificent Seven Neutron Stars
Safdi, Benjamin R.; Foster, Joshua W.; Dessert, Christopher
We report significant hard X-ray excesses in the energy range 2-8 keV for two nearby isolated neutron stars: RX J1856.6-3754 and RX J0420.0-5022. These neutron stars have previously been observed in soft X-rays to have nearly thermal spectra at temperatures ∼100 eV, which are thought to arise from the warm neutron star surfaces. We find nontrivial…
X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields
Brandt, William N.; Tzanavaris, Panayiotis; Basu-Zych, Antara +10 more
We investigate X-ray binary (XRB) luminosity function (XLF) scaling relations for Chandra-detected populations of low-mass XRBs (LMXBs) within the footprints of 24 early-type galaxies. Our sample includes Chandra and Hubble Space Telescope observed galaxies at $D\lesssim 25$ Mpc that have estimates of the globular cluster (GC) specific frequency (…
Whistler Waves and Electron Properties in the Inner Heliosphere: Helios Observations
Alexandrova, Olga; de Wit, Thierry Dudok; Maksimovic, Milan +4 more
We present the analysis of narrowband whistler wave signatures observed in the inner heliosphere (0.3-1 au). These signatures are bumps in the spectral density in the 10-200 Hz frequency range of the AC magnetic field as measured by the search coil magnetometer on board the Helios 1 spacecraft. We show that the majority of whistler signatures are …
Phase reddening on asteroid Bennu from visible and near-infrared spectroscopy
Barucci, M. A.; Fornasier, S.; Li, J. -Y. +10 more
Context. The NASA mission OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) has been observing near-Earth asteroid (101955) Bennu in close proximity since December 2018. In October 2020, the spacecraft collected a sample of surface material from Bennu to return to Earth.
Aims: In this work,…
High-resolution, 3D radiative transfer modelling. III. The DustPedia barred galaxies
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +17 more
Context. Dust in late-type galaxies in the local Universe is responsible for absorbing approximately one third of the energy emitted by stars. It is often assumed that dust heating is mainly attributable to the absorption of ultraviolet and optical photons emitted by the youngest (≤100 Myr) stars. Consequently, thermal re-emission by dust at far-i…
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra
Zhao, Gang; Németh, Péter; Zhao, Jingkun +1 more
182 single-lined hot subdwarf stars are identified by using spectra from the sixth and seventh data releases (DR6 and DR7) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope survey. We classified all the hot subdwarf stars using a canonical classification scheme, and got 89 sdB, 37 sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO, and 3 He-sdB sta…
A multiplicity study of transiting exoplanet host stars. II. Revised properties of transiting planetary systems with companions
Ginski, C.; Southworth, J.; Mancini, L. +2 more
Context. Binarity is a widespread phenomenon around solar-type stars, including the host stars of transiting extrasolar planets.
Aims: We performed a detailed study of six transiting planetary systems with relatively bright stars close enough to affect observations of these systems. These contaminants were characterised in a companion work. <…
First detection of ozone in the mid-infrared at Mars: implications for methane detection
Montmessin, F.; Fedorova, A.; Korablev, O. +9 more
Aims: The ExoMars Trace Gas Orbiter was sent to Mars in March 2016 to search for trace gases diagnostic of active geological or biogenic processes.
Methods: We report the first observation of the spectral features of Martian ozone (O3) in the mid-infrared range using the Atmospheric Chemistry Suite Mid-InfaRed (MIR) channel, a…