30 citations · 174 across the 22 of their papers we have counts for
22 papers
An Open Cluster Origin for Most Solar-Type Binaries in the Solar Neighborhood and Implications for Primordial Planet Stability
Anna C. Childs, Aaron M. Geller
We present the first Gaia-calibrated estimate of the contribution of dynamically processed open clusters (OCs) to the nearby solar-type field binary population and investigate the…
Precise Stellar Age Constraints and Habitable Zone Evolution in Exoplanet Systems
Grace Henry, Ted von Hippel, Anna Childs
Accurate stellar ages are fundamental to interpreting the evolutionary histories of habitable zone (HZ) planets. Because stellar luminosity evolves over time, HZ boundaries migrate…
Origins of Mercury's Big Heart of Iron: Exploring Pathways to Form High Core Mass Fraction (CMF) Planets via N-body Simulations
Haniyeh Tajer, Ji Wang, Anna C. Childs +3
Mercury's core mass fraction (CMF) is ~0.7, more than double that of the other rocky planets in the solar system, which have CMFs of ~0.3. The origin of Mercury's large, iron-rich…
Observational Signatures of a Previous Dynamical Instability in Multi-planet M-Dwarf Systems
Anna C. Childs, Alexa P. S. Hua, Rebecca G. Martin +2
We identify observational signatures suggesting a history of dynamical instability in 26 out of 34 M-dwarf multi-planet systems containing no large planets. These systems may have…
Composition Tracking for Collisions Between Differentiated Bodies in REBOUND
Noah Ferich, Anna C. Childs, Jason H. Steffen
Previous research suggests that impacts between planetary embryos and planetesimals during the late stages of planet formation can often determine the percentages of core and mantl…
Inclination instability of circumbinary planets
Stephen H. Lubow, Anna C. Childs, Rebecca G. Martin
We analyze a tilt instability of the orbit of an outer planet in a two planet circumbinary system that we recently reported. The binary is on an eccentric orbit and the inner circu…
Relativistic Effects on Circumbinary Disk Evolution: Breaking the Polar Alignment around Eccentric Black Hole Binary Systems
Anna C. Childs, Rebecca G. Martin, C. J. Nixon +4
We study the effects of general relativity (GR) on the evolution and alignment of circumbinary disks around binaries on all scales. We implement relativistic apsidal precession of…
Mergers of black hole binaries driven by misaligned circumbinary discs
Rebecca G. Martin, Stephen Lepp, Bing Zhang +2
With hydrodynamical simulations we examine the evolution of a highly misaligned circumbinary disc around a black hole binary including the effects of general relativity. We show th…
Goodbye to Chi-by-Eye: A Bayesian Analysis of Photometric Binaries in Six Open Clusters
Anna C. Childs, Aaron M. Geller, Ted von Hippel +2
We present a robust methodology for identifying photometric binaries in star clusters. Using Gaia DR3, Pan-STARRS and 2MASS data, we self-consistently define the cluster parameters…
Investigating Mass Segregation of the Binary Stars in the Open Cluster NGC 6819
Claire Zwicker, Aaron M. Geller, Anna C. Childs +2
We search for mass segregation in the intermediate-aged open cluster NGC 6819 within a carefully identified sample of probable cluster members. Using photometry from the Gaia, 2MAS…
Tracing the Origins of Mass Segregation in M35: Evidence for Primordially Segregated Binaries
Erin Motherway, Aaron M. Geller, Anna C. Childs +2
M35 is a young open cluster and home to an extensive binary population. Using Gaia DR3, Pan-STARRS, and 2MASS photometry with the Bayesian statistical software, BASE-9, we derive p…
Composition constraints of the TRAPPIST-1 planets from their formation
Anna C. Childs, Cody Shakespeare, David R. Rice +2
We study the formation of the TRAPPIST-1 (T1) planets starting shortly after Moon-sized bodies form just exterior to the ice line. Our model includes mass growth from pebble accret…
Coplanar circumbinary planets can be unstable to large tilt oscillations in the presence of an inner polar planet
Anna C. Childs, Rebecca G. Martin, Stephen Lepp +2
Mutually misaligned circumbinary planets may form in a warped or broken gas disc or from later planet-planet interactions. With numerical simulations and analytic estimates we expl…
Formation of super-Earths in icy dead zones around low-mass stars
David Vallet, Anna C. Childs, Rebecca G. Martin +2
While giant planet occurrence rates increase with stellar mass, occurrence rates of close-in super-Earths decrease. This is in contradiction to the expectation that the total mass…
Life on Exoplanets In the Habitable Zone of M-Dwarfs?
Anna C. Childs, Rebecca G. Martin, Mario Livio
Exoplanets orbiting in the habitable zone around M-dwarf stars have been prime targets in the search for life due to the long lifetimes of the host star, the prominence of such sta…
Misaligned circumbinary disks as efficient progenitors of interstellar asteroids
Anna C. Childs, Rebecca G. Martin
Gaseous circumbinary disks (CBDs) that are highly inclined to the binary orbit are commonly observed in nature. These disks harbor particles that can reach large mutual inclination…
A radial limit on polar circumbinary orbits from general relativity
Stephen Lepp, Rebecca G. Martin, Anna C. Childs
A particle orbiting a misaligned eccentric orbit binary undergoes nodal precession either around the binary angular momentum vector (a circulating orbit) or around a stationary inc…
Misalignment of terrestrial circumbinary planets as an indicator of their formation mechanism
Anna C. Childs, Rebecca G. Martin
Circumbinary gas disks are often observed to be misaligned to the binary orbit suggesting that planet formation may proceed in a misaligned disk. With N-body simulations we conside…
Collisional fragmentation and bulk composition tracking in REBOUND
Anna C. Childs, Jason H. Steffen
We present a fragmentation module and a composition tracking code for the -body code REBOUND. Our fragmentation code utilises previous semi-analytic models and follows an implem…
Formation of polar terrestrial circumbinary planets
Anna Childs, Rebecca Martin
All circumbinary planets currently detected are in orbits that are almost coplanar to the binary orbit. While misaligned circumbinary planets are more difficult to detect, observat…
Terrestrial planet formation in a circumbinary disc around a coplanar binary
Anna C. Childs, Rebecca G. Martin
With n-body simulations, we model terrestrial circumbinary planet (CBP) formation with an initial surface density profile motivated by hydrodynamic circumbinary gas disc simulation…
Giant planet effects on terrestrial planet formation and system architecture
Anna C. Childs, Elisa Quintana, Thomas Barclay +1
The giant planets of the solar system likely played a large role in shaping the architecture of the terrestrial planets. Using an updated collision model, we conduct a suite of hig…