Science Archives Publication System

Robo-AO M-dwarf Multiplicity Survey: Catalog

DOI: 10.3847/1538-3881/ab6ef1 Bibcode: 2020AJ....159..139L

Baranec, Christoph; Duev, Dmitry A.; Jensen-Clem, Rebecca +10 more

We analyze observations from Robo-AO's field M dwarf survey taken on the 2.1 m Kitt Peak telescope and perform a multiplicity comparison with Gaia DR2. Through its laser-guided, automated system, the Robo-AO instrument has yielded the largest adaptive optics M dwarf multiplicity survey to date. After developing an interface to visually identify an…

2020 • The Astronomical Journal

Gaia 29

Characterization of Temporarily Captured Minimoon 2020 CD₃ by Keck Time-resolved Spectrophotometry

DOI: 10.3847/2041-8213/abae69 Bibcode: 2020ApJ...900L..45B

Duev, Dmitry A.; Riddle, Reed; Ip, Wing-Huen +42 more

We present time-resolved visible spectrophotometry of 2020 CD₃, the second known minimoon. The spectrophotometry was taken with the Keck I/Low Resolution Imaging Spectrometer between wavelengths 434 and 912 nm in the B, g, V, R, I, and RG850 filters as it was leaving the Earth-Moon system on 2020 March 23 UTC. The spectrum of 2020 CD

2020 • The Astrophysical Journal

Gaia 29

Atmospheric compositions and observability of nitrogen-dominated ultra-short-period super-Earths

DOI: 10.1093/mnras/staa724 Bibcode: 2020MNRAS.494.1490Z

Mollière, Paul; Tsai, Shang-Min; Miguel, Yamila +1 more

We explore the chemistry and observability of nitrogen-dominated atmospheres for ultra-short-period super-Earths. We base the assumption that super-Earths could have nitrogen-filled atmospheres on observations of 55 Cancri e that favour a scenario with a high-mean-molecular-weight atmosphere. We take Titan's elemental budget as our starting point …

2020 • Monthly Notices of the Royal Astronomical Society

IUE 28

The Hidden Past of M92: Detection and Characterization of a Newly Formed 17° Long Stellar Stream Using the Canada-France Imaging Survey

DOI: 10.3847/1538-4357/abb6f7 Bibcode: 2020ApJ...902...89T

Jensen, Jaclyn; Navarro, Julio F.; Cuillandre, Jean-Charles +17 more

We present an analysis of the structure, kinematics, and orbit of a newly found stellar stream emanating from the globular cluster M92 (NGC 6341). This stream was discovered in an improved matched-filter map of the outer Galaxy, based on a "color-color-magnitude" diagram, created using photometry from the Canada-France Imaging Survey and the Pan-S…

2020 • The Astrophysical Journal

Gaia 28

X-rays observations of a super-Chandrasekhar object reveal an ONe and a CO white dwarf merger product embedded in a putative SN Iax remnant

DOI: 10.1051/0004-6361/202039232 Bibcode: 2020A&A...644L...8O

Todt, Helge; Langer, Norbert; Oskinova, Lidia M. +2 more

The merger of two white dwarfs (WDs) is a natural outcome of the evolution of many binary stars. Recently, a WD merger product, IRAS 00500+6713, was identified. IRAS 00500+6713 consists of a central star embedded in a circular nebula. The analysis of the optical spectrum of the central star revealed that it is hot, hydrogen, and helium free, and i…

2020 • Astronomy and Astrophysics

XMM-Newton 28

Purveyors of fine halos. II. Chemodynamical association of halo stars with Milky Way globular clusters

DOI: 10.1051/0004-6361/202037853 Bibcode: 2020A&A...637A..98H

Grebel, Eva K.; Hanke, Michael; Bastian, Ulrich +2 more

A long-lasting open question in the field of Galactic archeology refers to the size of the contribution from former globular cluster (GC) stars to the formation of the stellar halo of the Milky Way. We contribute to answering this important question by establishing observational links between the present-day halo field star population and GCs. To …

2020 • Astronomy and Astrophysics

Gaia 28

Lithium and beryllium in the Gaia-Enceladus galaxy

DOI: 10.1093/mnras/staa1653 Bibcode: 2020MNRAS.496.2902M

Molaro, P.; Cescutti, G.; Fu, X.

Data from Gaia DR2 and The Apache Point Observatory Galactic Evolution Experiment surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a disrupted dwarf galaxy named Gaia-Enceladus that collided with the Milky Way about 10 Gyr ago. This merging event offers an extraordinary opportunity to…

2020 • Monthly Notices of the Royal Astronomical Society

Gaia 28

Irregular Dust Features around Intermediate-mass Young Stars with GPI: Signs of Youth or Misaligned Disks?

DOI: 10.3847/1538-4357/ab59e2 Bibcode: 2020ApJ...888....7L

Monnier, John D.; Kraus, Stefan; Hinkley, Sasha +14 more

We are undertaking a large survey of over 30 disks using the Gemini Planet Imager (GPI) to see whether the observed dust structures match spectral energy distribution predictions and have any correlation with stellar properties. GPI can observe near-infrared light scattered from dust in circumstellar environments using high-resolution Polarimetric…

2020 • The Astrophysical Journal

Gaia 28

Physical Processes of Meso-Scale, Dynamic Auroral Forms

DOI: 10.1007/s11214-020-00665-y Bibcode: 2020SSRv..216...46F

Sergeev, V. A.; Nishimura, Y.; Forsyth, C. +2 more

Meso-scale auroral forms, such as poleward boundary intensifications, streamers, omega bands, beads and giant undulations, are manifestations of dynamic processes in the magnetosphere driven, to a large part, by plasma instabilities in the magnetotail. New observations from ground- and space-based instrumentation and theoretical treatments are giv…

2020 • Space Science Reviews

Cluster 28

The gravity field and interior structure of Dione

DOI: 10.1016/j.icarus.2020.113713 Bibcode: 2020Icar..34513713Z

Tortora, Paolo; Zannoni, Marco; Hemingway, Douglas +1 more

During its mission in the Saturn system, Cassini performed five close flybys of Dione. During three of them, radio tracking data were collected during the closest approach, allowing estimation of the full degree-2 gravity field by precise spacecraft orbit determination.

The gravity field of Dione is dominated by J₂ and C₂₂

2020 • Icarus

Cassini 28