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Extragalactic fast X-ray transient candidates discovered by Chandra (2014-2022)
Bauer, F. E.; Brandt, W. N.; Xue, Y. Q. +9 more
Context. Extragalactic fast X-ray transients (FXTs) are short flashes of X-ray photons of unknown origin that last a few minutes to hours.
Aims: We extend the previous search for extragalactic FXTs (based on sources in the Chandra Source Catalog 2.0, CSC2) to further Chandra archival data between 2014 and 2022.
Methods: We extracted X-ra…
Direct Observational Evidence of the Multi-scale, Dynamical Mass Accretion Toward a High-mass Star-forming Hub-filament System
Zhang, Yong; Sanhueza, Patricio; Tej, Anandmayee +28 more
There is growing evidence that high-mass star formation and hub-filament systems (HFS) are intricately linked. The gas kinematics along the filaments and the forming high-mass star(s) in the central hub are in excellent agreement with the new generation of global hierarchical high-mass star formation models. In this paper, we present an observatio…
Speckle Interferometry with CMOS Detector
Strakhov, I. A.; Safonov, B. S.; Cheryasov, D. V.
In 2022 we carried out an upgrade of the speckle polarimeter (SPP)—the facility instrument of the 2.5-m telescope of the Caucasian Observatory of the SAI MSU. During the overhaul, CMOS Hamamatsu ORCA-Quest qCMOS C15550-20UP was installed as the main detector, some drawbacks of the previous version of the instrument were eliminated. In this paper, …
The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets
Butler, R. Paul; Hellier, Coel; Bieryla, Allyson +84 more
NASA's Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample of transiting hot Jupiters suitable for population studies. Assembling such a sample requires confirming hundreds of planet candidates with additional follow-up observations. Here we pr…
Mid-to-late M Dwarfs Lack Jupiter Analogs
Latham, David W.; Berlind, Perry; Calkins, Michael L. +6 more
Cold Jovian planets play an important role in sculpting the dynamical environment in which inner terrestrial planets form. The core accretion model predicts that giant planets cannot form around low-mass M dwarfs, although this idea has been challenged by recent planet discoveries. Here, we investigate the occurrence rate of giant planets around l…
The multiplicity fraction in 202 open clusters from Gaia
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +7 more
In this study, we estimate the fraction of binaries with high mass ratios for 202 open clusters in the extended solar neighbourhood (closer than 1.5 kpc from the Sun). This is one of the largest homogeneous catalogues of multiplicity fractions in open clusters to date, including the unresolved and total (close-binary) multiplicity fractions of mai…
Herbig Stars
Waters, L. B. F. M.; Brittain, Sean D.; Kamp, Inga +2 more
Herbig Ae/Be stars are young contracting stars on the radiative track in the HR diagram on their way to the main sequence. These stars provide a valuable link between high and low mass stars. Here we review the progress that has been made in our understanding of these fascinating objects and their disks since the last major review on this topic pu…
Reverberation Mapping of IC 4329A
Onken, Christopher A.; Bentz, Misty C.; Valluri, Monica +1 more
We present the results of a new reverberation mapping campaign for the broad-line active galactic nucleus (AGN) in the edge-on spiral IC 4329A. Monitoring of the optical continuum with V-band photometry and broad emission-line flux variability with moderate-resolution spectroscopy allowed emission-line light curves to be measured for Hβ, Hγ, and H…
The nearest neutron star candidate in a binary revealed by optical time-domain surveys
Liu, Jifeng; Weng, Shan-Shan; Bai, Yu +19 more
The near-Earth (within ∼100 pc) supernova explosions in the past several million years can cause the global deposition of radioactive elements (e.g., 60Fe) on Earth. The remnants of such supernovae are too old to be easily identified. It is therefore of great interest to search for million-year-old near-Earth neutron stars or black hole…
Comparative Analysis of TRGBs (CATs) from Unsupervised, Multi-halo-field Measurements: Contrast is Key
Li, S.; Wu, J.; Scolnic, D. +5 more
The tip of the red giant branch (TRGB) is an apparent discontinuity of the luminosity function (LF) due to the end of the red giant evolutionary phase and is used to measure distances in the local universe. In practice, tip localization via edge detection response (EDR) relies on several methods applied on a case-by-case basis. It is hard to evalu…