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Stellar Abundance Maps of the Milky Way Disk
Anna-Christina Eilers, David W. Hogg, Hans-Walter Rix +4
To understand the formation of the Milky Way's prominent bar it is important to know whether stars in the bar differ in the chemical element composition of their birth material as…
TOI-2076 and TOI-1807: Two young, comoving planetary systems within 50 pc identified by TESS that are ideal candidates for further follow-up
Christina Hedges, Alex Hughes, Steven Giacalone +42
We report the discovery of two planetary systems around comoving stars; TOI-2076 (TIC 27491137) and TOI-1807 (TIC 180695581). TOI-2076 is a nearby (41.9 pc) multi-planetary system…
APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
Sten Hasselquist, Christian R. Hayes, Jianhui Lian +42
The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey has obtained high-resolution spectra for thousands of red giant stars distributed among the massi…
The homogeneity of the star forming environment of the Milky Way disk over time
Melissa K. Ness, Adam J. Wheeler, Kevin McKinnon +4
Stellar abundances and ages afford the means to link chemical enrichment to galactic formation. In the Milky Way, individual element abundances show tight correlations with age, wh…
Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
Felipe A. Santana, Rachael L. Beaton, Kevin R. Covey +43
APOGEE is a high-resolution (R sim 22,000), near-infrared, multi-epoch, spectroscopic survey of the Milky Way. The second generation of the APOGEE project, APOGEE-2, includes an ex…
Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
Rachael L. Beaton, Ryan J. Oelkers, Christian R. Hayes +57
APOGEE-2 is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemo-dynamical mapping of the Milky Way Galaxy. The targeting for APOGEE-2 is…
The Clustering of Orbital Poles Induced by the LMC: Hints for the Origin of Planes of Satellites
Nicolas Garavito-Camargo, Ekta Patel, Gurtina Besla +4
A significant fraction of Milky Way (MW) satellites exhibit phase-space properties consistent with a coherent orbital plane. Using tailored N--body simulations of a spherical MW ha…
Double-lined spectroscopic binaries in the APOGEE DR16 and DR17 data
Marina Kounkel, Kevin R. Covey, Keivan G. Stassun +25
APOGEE spectra offer 1 km s precision in the measurement of stellar radial velocities (RVs). This holds even when multiple stars are captured in the same spectrum,…
Snails Across Scales: Local and Global Phase-Mixing Structures as Probes of the Past and Future Milky Way
Suroor S. Gandhi, Kathryn V. Johnston, Jason A. S. Hunt +3
Signatures of vertical disequilibrium have been observed across the Milky Way's disk. These signatures manifest locally as unmixed phase-spirals in -- space ("snails-in-pha…
exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series
Daniel Foreman-Mackey, Rodrigo Luger, Eric Agol +13
"exoplanet" is a toolkit for probabilistic modeling of astronomical time series data, with a focus on observations of exoplanets, using PyMC3 (Salvatier et al., 2016). PyMC3 is a f…
Selection Functions in Astronomical Data Modeling, with the Space Density of White Dwarfs as Worked Example
Hans-Walter Rix, David W. Hogg, Douglas Boubert +6
Statistical studies of astronomical data sets, in particular of cataloged properties for discrete objects, are central to astrophysics. One cannot model those objects' population p…
Age-Dating Red Giant Stars Associated with Galactic Disk and Halo Substructures
Samuel K. Grunblatt, Joel C. Zinn, Adrian M. Price-Whelan +12
The vast majority of Milky Way stellar halo stars were likely accreted from a small number (3) of relatively large dwarf galaxy accretion events. However, the timing of t…
Orbital and stellar parameters for 2M06464003+0109157: a double-lined eclipsing binary of spotted, sub-solar twins
Annaliese Miller, Marina Kounkel, Chase Boggio +2
We calculated physical and orbital properties for 2M06464003+0109157, a 1.06 day eclipsing double lined spectroscopic binary. We modelled the system's ASAS-SN and TESS light curves…
Chemodynamically Characterizing the Jhelum Stellar Stream with APOGEE-2
Allyson A. Sheffield, Aidan Z. Subrahimovic, Mohammad Refat +15
We present the kinematic and chemical profiles of red giant stars observed by the APOGEE-2 survey in the direction of the Jhelum stellar stream, a Milky Way substructure located in…
The Gas Content and Stripping of Local Group Dwarf Galaxies
Mary E. Putman, Yong Zheng, Adrian M. Price-Whelan +4
The gas content of the complete compilation of Local Group dwarf galaxies (119 within 2 Mpc) is presented using HI survey data. Within the virial radius of the Milky Way (224 kpc h…