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Resolving the FU Orionis System with ALMA: Interacting Twin Disks?
Liu, Hauyu Baobab; Williams, Jonathan; Zhu, Zhaohuan +7 more
FU Orionis objects are low-mass pre-main sequence stars characterized by dramatic outbursts several magnitudes in brightness. These outbursts are linked to episodic accretion events in which stars gain a significant portion of their mass. The physical processes behind these accretion events are not yet well understood. The archetypal FU Ori system…
Multiwavelength Follow-up of the Hyperluminous Intermediate-mass Black Hole Candidate 3XMM J215022.4-055108
Romanowsky, Aaron J.; Remillard, Ronald A.; Strader, Jay +6 more
We recently discovered the X-ray/optical outbursting source 3XMM J215022.4-055108. It was best explained as the tidal disruption of a star by an intermediate-mass black hole of mass of a few tens of thousand solar masses in a massive star cluster at the outskirts of a large barred lenticular galaxy at DL = 247 Mpc. However, we could not…
Lupus DANCe. Census of stars and 6D structure with Gaia-DR2 data
Bertin, E.; Miret-Roig, N.; Bouy, H. +8 more
Context. Lupus is recognised as one of the closest star-forming regions, but the lack of trigonometric parallaxes in the pre-Gaia era hampered many studies on the kinematic properties of this region and led to incomplete censuses of its stellar population.
Aims: We use the second data release of the Gaia space mission combined with published …
Exploring the Stellar Age Distribution of the Milky Way Bulge Using APOGEE
Cohen, Roger E.; Cunha, Katia; Smith, Verne V. +20 more
We present stellar age distributions of the Milky Way bulge region using ages for ∼6000 high-luminosity ( $\mathrm{log}(g)\lt 2.0$ ), metal-rich ([Fe/H] ≥ -0.5) bulge stars observed by the Apache Point Observatory Galactic Evolution Experiment. Ages are derived using The Cannon label-transfer method, trained on a sample of nearby luminous giants w…
Expanding the Y Dwarf Census with Spitzer Follow-up of the Coldest CatWISE Solar Neighborhood Discoveries
Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy +11 more
We present Spitzer 3.6 and 4.5 µm follow-up of 170 candidate extremely cool brown dwarfs newly discovered via the combination of Wide-field Infrared Survey Explorer (WISE) and NEOWISE imaging at 3-5 µm. CatWISE, a joint analysis of archival WISE and NEOWISE data, has improved upon the motion measurements of AllWISE by leveraging a >…
JINGLE - IV. Dust, H I gas, and metal scaling laws in the local Universe
Clements, D. L.; Lin, L.; Saintonge, A. +29 more
Scaling laws of dust, H I gas, and metal mass with stellar mass, specific star formation rate, and metallicity are crucial to our understanding of the build-up of galaxies through their enrichment with metals and dust. In this work, we analyse how the dust and metal content varies with specific gas mass (MH I/M⋆) across a div…
Magnetic Flux of Active Regions Determining the Eruptive Character of Large Solar Flares
Veronig, Astrid M.; Hou, Yijun; Li, Ting +3 more
We establish the largest eruptive/confined flare database to date and analyze 322 flares of Geostationary Operational Environmental Satellite class M1.0 and larger that occurred during 2010-2019, i.e., almost spanning all of solar cycle 24. We find that the total unsigned magnetic flux ( ${{\rm{\Phi }}}_{\mathrm{AR}}$ ) of active regions (ARs) is …
A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
High-cadence observations of the Galactic bulge by the microlensing surveys led to the discovery of a handful of extremely short-timescale microlensing events that can be attributed to free-floating or wide-orbit planets. Here, we report the discovery of another strong free-floating planet candidate, which was found from the analysis of the gravit…
A Helium-flash-induced Mixing Event Can Explain the Lithium Abundances of Red Clump Stars
Schwab, Josiah
Observations demonstrate that the surface abundance of ${}^{7}\mathrm{Li}$ in low-mass stars changes dramatically between the tip of the red giant branch and the red clump. This naturally suggests an association with the helium core flash, which occurs between these two stages. Using stellar evolution models and a simple, ad hoc mixing prescriptio…
Stellar 3D kinematics in the Draco dwarf spheroidal galaxy
Massari, D.; Helmi, A.; Spina, L. +3 more
Aims: We present the first three-dimensional internal motions for individual stars in the Draco dwarf spheroidal galaxy.
Methods: By combining first-epoch Hubble Space Telescope observations and second-epoch Gaia Data Release 2 positions, we measured the proper motions of 149 sources in the direction of Draco. We determined the line-of-s…