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Lens Mass Estimate in the Galactic Disk Extreme Parallax Microlensing Event Gaia19dke
Reichart, D. E.; Poleski, R.; Gromadzki, M. +78 more
We present the results of our analysis of Gaia19dke, an extraordinary microlensing event in the Cygnus constellation that the Gaia satellite discovered. This event featured a strong microlensing parallax effect, resulting in multiple light curve peaks. We conducted extensive photometric, spectroscopic, and high-resolution imaging follow-up observa…
Ejecta–Circumstellar Medium Interaction in High-density Environment Contribution to Kilonova Emission: Application to GRB 191019A
Liang, En-Wei; Lü, Hou-Jun; Wang, Suo-Ning +4 more
The nearby long-duration GRB 191019A recently detected by Swift lacks an associated supernova and belongs to a host galaxy with little star formation activity, suggesting that the origin of this burst is the result of a merger of two compact objects with dynamical interactions in a high-density medium of an active galactic nucleus. Given the poten…
Database Design for SpExoDisks: A Database and Web Portal for Spectra of Exoplanet-forming Disks
Banzatti, Andrea; Hinkel, Natalie R.; Wheeler, Caleb H.
Data access—or the availability of new and archival data for use by the larger community—is key for scientific advancement. How data is presented, searched, and formatted determines accessibility and it can be difficult to find a solution that fits the needs of a given subdiscipline. We present a generalized roadmap for developing a specialty astr…
ICM-SHOX. I. Methodology Overview and Discovery of a Gas–Dark Matter Velocity Decoupling in the MACS J0018.5+1626 Merger
Mroczkowski, Tony; Zitrin, Adi; Stanford, S. A. +12 more
Galaxy cluster mergers are rich sources of information to test cluster astrophysics and cosmology. However, cluster mergers produce complex projected signals that are difficult to interpret physically from individual observational probes. Multi-probe constraints on the gas and dark matter (DM) cluster components are necessary to infer merger param…
Unraveling the Tectonic History of the Tharsis Rise on Mars: Plume Migration and Critical Taper Dome
Karagoz, Oguzcan; Kenkmann, Thomas; Hergarten, Stefan
Wrinkle ridges are widespread tectonic landforms that serve as paleo-strain and paleo-stress indicators of the compressional history and thermal evolution of Mars. To reconstruct the center of the Tharsis rise and its migration with time, we mapped wrinkle ridges in the periphery of the dome and analyzed 34,741 wrinkle ridge segments with a total …
First resolved stellar halo kinematics of a Milky Way-mass galaxy outside the Local Group: The flat counter-rotating halo in NGC 4945
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +6 more
The stellar halos of galaxies, primarily formed through the accretion and merger of smaller objects, are an important tool for understanding the hierarchical mass assembly of galaxies. However, the inner regions of stellar halos in disk galaxies are predicted to have an in situ component that is expected to be prominent along the major axis. Kinem…
Magnetic activity of radio stars based on TESS and LAMOST surveys
Zhang, Liyun; Han, Xianming L.; Misra, Prabhakar +2 more
Aims: Stellar flares serve as crucial indicators stellar magnetic activity. Radio emissions were detectable across all stages of stellar evolution. We define radio stars in our paper as stars with radio continuum emission in the frequency region of about 1.4-375 GHz from the catalog published by Wendker (1995, A&AS, 109, 177; 2015, VizieR…
Discovered a new open cluster near the poorly studied Majaess 190
Tadross, A. L.
We present the results of a comprehensive astrophysical study of a newly discovered open cluster, dubbed Ash-1. Using the third data release of the Gaia space mission, Gaia DR3, Ash-1 was accidentally discovered within the constellation Sagittarius in the field of the poorly studied cluster Majaess 190. Here we present the first estimates of these…
Mass-loss Rate of Highly Evolved Stars in the Magellanic Clouds
Yang, Ming; Gao, Jian; Ren, Yi +3 more
Asymptotic giant branch stars (AGBs) and red supergiant stars (RSGs) exhibit significant mass-loss phenomena and are considered important sources of interstellar dust. In this work, we employed a uniform method of spectral energy distribution fitting to analyze a large, and hence statistically significant, sample of approximately 40,000 RSGs and A…
RedDots: Limits on habitable and undetected planets orbiting nearby stars GJ 832, GJ 674, and Ross 128
Amado, P. J.; Caballero, J. A.; Reiners, A. +16 more
Context. The nearby (d < 5 pc) M dwarfs GJ 832, GJ 674, and Ross 128 each host a single exoplanet, with Ross 128 b located within the optimistic habitable zone. Due to their low mass and close proximity, these three systems are prime candidates for further characterization studies. Aims. Using HARPS spectroscopic data obtained by the RedDots ca…