Search Publications
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…
Testing the cosmic curvature at high redshifts: the combination of LSST strong lensing systems and quasars as new standard candles
Zhang, Jia; Liu, Yuting; Cao, Shuo +3 more
The cosmic curvature, a fundamental parameter for cosmology could hold deep clues to inflation and cosmic origins. We propose an improved model-independent method to constrain the cosmic curvature by combining the constructed Hubble diagram of high-redshift quasars with galactic-scale strong lensing systems expected to be seen by the forthcoming L…
Studying the Composition and Mineralogy of the Hermean Surface with the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) for the BepiColombo Mission: An Update
Hiesinger, H.; Maturilli, A.; Helbert, J. +10 more
Launched onboard the BepiColombo Mercury Planetary Orbiter (MPO) in October 2018, the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) is on its way to planet Mercury. MERTIS consists of a push-broom IR-spectrometer (TIS) and a radiometer (TIR), which operate in the wavelength regions of 7-14 µm and 7-40 µm, respectively. …
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array. I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates
Lindqvist, M.; Olofsson, H.; Sahai, R. +16 more
Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic Giant Branch (AGB). Aim. The aim in this first publication is to constrain the sizes of the 12CO emitting region from the…
Ongoing flyby in the young multiple system UX Tauri
Pinte, C.; Ménard, F.; van der Plas, G. +28 more
We present observations of the young multiple system UX Tauri to look for circumstellar disks and for signs of dynamical interactions. We obtained SPHERE/IRDIS deep differential polarization images in the J and H bands. We also used ALMA archival CO data. Large extended spirals are well detected in scattered light coming out of the disk of UX Tau …