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The First Habitable-zone Earth-sized Planet from TESS. I. Validation of the TOI-700 System
Kostov, Veselin B.; Barclay, Thomas; Vanderburg, Andrew +92 more
We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zone in the Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R⊕ to 2.6 R⊕ and orbital pe…
Coherent radio emission from a quiescent red dwarf indicative of star-planet interaction
White, G. J.; Callingham, J. R.; Shimwell, T. W. +11 more
Low-frequency (ν ≲ 150 MHz) stellar radio emission is expected to originate in the outer corona at heights comparable to and larger than the stellar radius. Such emission from the Sun has been used to study coronal structure, mass ejections and space-weather conditions around the planets1. Searches for low-frequency emission from other …
Close Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color-Magnitude Diagram
Green, Paul J.; Hogg, David W.; Majewski, Steven R. +21 more
Many problems in contemporary astrophysics—from understanding the formation of black holes to untangling the chemical evolution of galaxies—rely on knowledge about binary stars. This, in turn, depends on the discovery and characterization of binary companions for large numbers of different kinds of stars in different chemical and dynamical environ…
Magnetotail dipolarization fronts and particle acceleration: A review
Liu, Chengming; Grigorenko, Elena E.; Fu, Huishan +6 more
The Sloan Digital Sky Survey Reverberation Mapping Project: Estimating Masses of Black Holes in Quasars with Single-epoch Spectroscopy
Brandt, W. N.; Shen, Yue; Peterson, Bradley M. +19 more
It is well known that reverberation mapping of active galactic nuclei (AGNs) reveals a relationship between AGN luminosity and the size of the broad-line region, and that use of this relationship, combined with the Doppler width of the broad emission line, enables an estimate of the mass of the black hole at the center of the active nucleus based …
An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz
Campana, S.; Berger, E.; Gromadzki, M. +42 more
At 66 Mpc, AT2019qiz is the closest optical tidal disruption event (TDE) to date, with a luminosity intermediate between the bulk of the population and the faint-and-fast event iPTF16fnl. Its proximity allowed a very early detection and triggering of multiwavelength and spectroscopic follow-up well before maximum light. The velocity dispersion of …
Observing the tail of reionization: neutral islands in the z = 5.5 Lyman-α forest
Nasir, Fahad; D'Aloisio, Anson
Previous studies have noted difficulties in modelling the highest opacities of the z > 5.5 Ly α forest, epitomized by the extreme Lyα trough observed towards quasar ULAS J0148 + 0600. One possibility is that the most opaque regions at these redshifts contain significant amounts of neutral hydrogen. This explanation, which abandons the common as…
The CatWISE Preliminary Catalog: Motions from WISE and NEOWISE Data
Teplitz, Harry I.; Schlegel, David J.; Mobasher, Bahram +19 more
CatWISE is a program to catalog sources selected from combined WISE and NEOWISE all-sky survey data at 3.4 and 4.6 &mgrm (W1 and W2). The CatWISE Preliminary Catalog consists of 900,849,014 sources measured in data collected from 2010 to 2016. This data set represents four times as many exposures and spans over 10 times as large a time baselin…
The MOSDEF Survey: The Variation of the Dust Attenuation Curve with Metallicity
Siana, Brian; Azadi, Mojegan; Shivaei, Irene +14 more
We derive a UV-optical stellar dust attenuation curve of galaxies at z = 1.4-2.6 as a function of gas-phase metallicity. We use a sample of 218 star-forming galaxies, excluding those with very young or heavily obscured star formation, from the MOSFIRE Deep Evolution Field survey with Hα, Hβ, and [N II]λ 6585 spectroscopic measurements. We constrai…
Limit on the LMC mass from a census of its satellites
Belokurov, Vasily A.; Erkal, Denis
We study the orbits of dwarf galaxies in the combined presence of the Milky Way and Large Magellanic Cloud (LMC) and find six dwarfs that were likely accreted with the LMC (Car 2, Car 3, Hor 1, Hyi 1, Phe 2, and Ret 2), in addition to the Small Magellanic Cloud (SMC), representing strong evidence of dwarf galaxy group infall. This procedure depend…