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ESPRESSO mass determination of TOI-263b: an extreme inhabitant of the brown dwarf desert
Mustill, A. J.; Zapatero Osorio, M. R.; Zechmeister, M. +8 more
The TESS mission has reported a wealth of new planetary systems around bright and nearby stars amenable for detailed characterizations of planet properties and atmospheres. However, not all interesting TESS planets orbit around bright host stars. TOI-263 b is a validated ultra-short-period substellar object in a 0.56-day orbit around a faint (V = …
Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Troja, E.; Caraveo, P. A.; Mirabal, N. +114 more
We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ-ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly timescale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT cata…
Supernovae producing unbound binaries and triples
Kochanek, C. S.
The fraction of stars that are in binaries or triples at the time of stellar death and the fraction of these systems that survive the supernova explosion are crucial constraints for evolution models and predictions for gravitational wave source populations. These fractions are also subject to direct observational determination. Here, we search 10 …
Characterizing the Protolunar Disk of the Accreting Companion GQ Lupi B
Kesseli, Aurora Y.; Brinchmann, Jarle; Milli, Julien +11 more
GQ Lup B is a young and accreting, substellar companion that appears to drive a spiral arm in the circumstellar disk of its host star. We report high-contrast imaging observations of GQ Lup B with VLT/NACO at 4-5 µm and medium-resolution integral field spectroscopy with VLT/MUSE. The optical spectrum is consistent with an M9 spectral type, s…
Direct Observation of a Large-scale CME Flux Rope Event Arising from an Unwinding Coronal Jet
Yang, Jiayan; Hong, Junchao; Duan, Yadan +2 more
Coronal mass ejections (CMEs) and coronal jets are two types of common solar eruptive phenomena, which often independently happen at different spatial scales. In this work, we present a stereoscopic observation of a large-scale CME flux rope arising from an unwinding blowout jet in a multipolar complex magnetic system. Based on a multiband observa…
Transition from coherent cores to surrounding cloud in L1688
Caselli, Paola; Rosolowsky, Erik; Kirk, Helen +8 more
Context. Stars form in cold dense cores showing subsonic velocity dispersions. The parental molecular clouds display higher temperatures and supersonic velocity dispersions. The transition from core to cloud has been observed in velocity dispersion, but temperature and abundance variations are unknown.
Aims: We aim to measure the temperature …
Radio Spectral Imaging of an M8.4 Eruptive Solar Flare: Possible Evidence of a Termination Shock
Krucker, Säm; Chen, Bin; Yu, Sijie +2 more
Solar flare termination shocks have been suggested as one of the viable mechanisms for accelerating electrons and ions to high energies. Observational evidence of such shocks, however, remains rare. Using radio dynamic spectroscopic imaging of a long-duration C1.9 flare obtained by the Karl G. Jansky Very Large Array (VLA), Chen et al. suggested t…
Blue supergiants as tests for stellar physics
Meynet, Georges; Saio, Hideyuki; Georgy, Cyril
Context. Massive star evolution is still poorly understood, and observational tests are required to discriminate between different implementations of physical phenomena in stellar evolution codes.
Aims: By confronting stellar evolution models with observed properties of blue supergiants, such as pulsations, the chemical composition, and posit…
The GADOT Galaxy Survey: Dense Gas and Feedback in Herschel-selected Starburst Galaxies at Redshifts 2 to 6
Neri, Roberto; Cooray, Asantha; Riechers, Dominik A. +1 more
We report the detection of 23 OH+ 1 → 0 absorption, emission, or P-Cygni-shaped lines and CO(J = 9→8) emission lines in 18 Herschel-selected z = 2-6 starburst galaxies with the Atacama Large Millimeter/submillimeter Array and the NOrthern Extended Millimeter Array, taken as part of the Gas And Dust Over cosmic Time Galaxy Survey. We fin…
Evolutionary view through the starless cores in Taurus. Deuteration in TMC 1-C and TMC 1-CP
Ward-Thompson, D.; Kramer, C.; Fuente, A. +11 more
Context. The chemical and physical evolution of starless and pre-stellar cores are of paramount importance to understanding the process of star formation. The Taurus Molecular Cloud cores TMC 1-C and TMC 1-CP share similar initial conditions and provide an excellent opportunity to understand the evolution of the pre-stellar core phase.
Aims: …