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Cataclysmic Variables in the First Year of the Zwicky Transient Facility
Riddle, Reed; Szkody, Paula; Bellm, Eric C. +25 more
Using selection criteria based on amplitude, time, and color, we have identified 329 objects as known or candidate cataclysmic variables (CVs) during the first year of testing and operation of the Zwicky Transient Facility. Of these, 90 are previously confirmed CVs, 218 are strong candidates based on the shape and color of their light curves obtai…
The MASSIVE Survey. XV. A Stellar Dynamical Mass Measurement of the Supermassive Black Hole in Massive Elliptical Galaxy NGC 1453
Ma, Chung-Pei; Greene, Jenny E.; Blakeslee, John P. +4 more
We present a new stellar dynamical mass measurement (M_{BH}) of the supermassive black hole (SMBH) in NGC 1453, a fast-rotating massive elliptical galaxy in the MASSIVE survey. We measure stellar kinematics in 135 spatial bins in the central 1.5 kpc × 2 kpc region of the galaxy using high signal-to-noise ratio (S/N ∼ 130) spectra from the Gemini-N…
Returning Samples from Enceladus for Life Detection
MacKenzie, Shannon M.; Davila, Alfonso F.; Neveu, Marc +7 more
Evidence suggests that Saturn's icy moon Enceladus has a subsurface ocean that sources plumes of water vapor and ice vented to space from its south pole. In situ analyses of this material by the Cassini spacecraft have shown that the ocean contains key ingredients for life (elements H, C, N, O and possibly S; simple and complex organic compounds; …
Transmission Spectroscopy of WASP-79b from 0.6 to 5.0 µm
Jayaraman, Rahul; Nikolov, Nikolay; Sing, David K. +18 more
As part of the Panchromatic Exoplanet Treasury program, we have conducted a spectroscopic study of WASP-79b, an inflated hot Jupiter orbiting an F-type star in Eridanus with a period of 3.66 days. Building on the original WASP and TRAPPIST photometry of Smalley et al., we examine Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3) (1.125-1.650…
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,…