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Around Which Stars Can TESS Detect Earth-like Planets? The Revised TESS Habitable Zone Catalog
Stassun, K.; Kaltenegger, L.; Pepper, J. +3 more
In the search for life in the cosmos, NASA's Transiting Exoplanet Survey Satellite (TESS) mission has already monitored about 74% of the sky for transiting extrasolar planets, including potentially habitable worlds. However, TESS only observed a fraction of the stars long enough to be able to find planets like Earth. We use the primary mission dat…
Nonthermal element abundances at astrophysical shocks
Eichmann, Björn; Rachen, Jörg P.
The nonthermal source abundances of elements play a crucial role in the understanding of cosmic ray phenomena from a few GeV up to several tens of EeV . We present a first systematic approach to describe the change of the abundances from the thermal to the nonthermal state via diffusive shock acceleration by a temporally evolving shock. We conside…
Fresh Insights on the Kinematics of M49's Globular Cluster System with MMT/Hectospec Spectroscopy
Zhang, Hongxin; Liu, Chengze; Zabludoff, Ann +10 more
We present the first results of an MMT/Hectospec campaign to measure the kinematics of globular clusters (GCs) around M49-the brightest galaxy in the Virgo galaxy cluster, which dominates the Virgo B subcluster. The data include kinematic tracers beyond 95 kpc (~5.2 effective radii) for M49 for the first time, enabling us to achieve three key insi…
Disappearance of the Fe K α emission line in ultracompact X-ray binaries 4U 1543-624 and Swift J1756.9-2508
Guillot, Sebastien; Vasilopoulos, Georgios; Webb, Natalie +1 more
We investigate the long-term variability of the iron K α line in the spectra of two ultracompact X-ray sources (UCXBs) with C/O-rich donors. We revisit archival observations from five different X-ray telescopes, over an ∼20-yr period. Adopting physically motivated models for the spectral continuum, we probe the long-term evolution of the source em…
Electron Heat Flux in the Solar Wind: Generalized Approaches to Fluid Transport With a Variety of Skewed Velocity Distributions
Cranmer, Steven R.; Schiff, Avery J.
In the solar corona and solar wind, electron heat conduction is an important process that transports energy over large distances and helps determine the spatial variation of temperature. High-density regions undergoing rapid particle-particle collisions exhibit a heat flux described well by classical Spitzer-Härm theory. However, much of the helio…
Non-synchronous rotations in massive binary systems. II. The case of HD 96264A
Gamen, R.; Barbá, R. H.; Morrell, N. I. +3 more
Context. The OWN Survey has detected several O-type stars with composite spectra whose individual components show very different line broadening. Some of these stars have been revealed as binary systems whose components are asynchronous. This fact may be related to the processes acting in these systems (e.g., angular-momentum transfer, tidal force…
IGRINS RV: A Precision Radial Velocity Pipeline for IGRINS Using Modified Forward Modeling in the Near-infrared
Tang, Shih-Yun; Johns-Krull, Christopher M.; Prato, L. +7 more
Application of the radial velocity (RV) technique in the near-infrared is valuable because of the diminished impact of stellar activity at longer wavelengths, making it particularly advantageous for the study of late-type stars but also for solar-type objects. In this paper, we present the IGRINS RV open-source python pipeline for computing infrar…
The C18O core mass function toward Orion A: Single-dish observations
Sanhueza, Patricio; Kataoka, Akimasa; Nakamura, Fumitaka +6 more
We have performed an unbiased dense core survey toward the Orion A Giant Molecular Cloud in the C18O (J = 1-0) emission line taken with the Nobeyama Radio Observatory (NRO) 45 m telescope. The effective angular resolution of the map is 26″, which corresponds to ~0.05 pc at a distance of 414 pc. By using the Herschel-Planck H2…
Constraints on Emission Source Locations of Methane Detected by Mars Science Laboratory
Newman, C. E.; Richardson, M. I.; Viúdez-Moreiras, D.
The Sample Analysis at Mars (SAM) instrument on the Mars Science Laboratory (MSL) Curiosity rover has detected both methane spikes and variable background methane abundance in recent years in Gale Crater, Mars. While methane spikes have been attributed to a hypothetical local or regional source emission, the background measurements acquired during…
Chemically Fresh Gas Inflows Detected in a Nearby High-mass Star-forming Region
Kim, Kee-Tae; Liu, Tie; Mei, Ying +9 more
We report the detection of a chemically fresh inflow that is feeding high-mass young-stellar-object (HMYSO) growth in the nearby high-mass star-forming region G352.63 made with both the Atacama Large Millimeter/submillimeter Array (ALMA) and the Submillimeter Array (SMA). High-quality images of the dust and molecular lines from both ALMA and SMA h…