Cheyanne Shariat
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View article: Wide Binaries in an Ultra-faint Dwarf Galaxy: Discovery, Population Modeling, and A Nail in the Coffin of Primordial black hole Dark Matter
Wide Binaries in an Ultra-faint Dwarf Galaxy: Discovery, Population Modeling, and A Nail in the Coffin of Primordial black hole Dark Matter Open
We report the discovery and characterization of a wide binary population in the ultrafaint dwarf galaxy Boötes I using deep JWST/NIRCam imaging. Our sample consists of 52 candidate binaries with projected separations of 7000–16,000 au and …
View article: 10,000 Resolved Triples from Gaia: Empirical Constraints on Triple Star Populations
10,000 Resolved Triples from Gaia: Empirical Constraints on Triple Star Populations Open
We present a catalog of ∼10,000 resolved triple star systems within 500 pc of the Sun, constructed using Gaia data. The triples include main-sequence, red giant, and white dwarf components spanning separations of 10–50,000 au. A well-chara…
View article: From Wide Triples to UCXBs: Multimessenger Detection of Dynamically-formed Black Hole-White Dwarf Systems with LISA
From Wide Triples to UCXBs: Multimessenger Detection of Dynamically-formed Black Hole-White Dwarf Systems with LISA Open
Ultracompact X-ray binaries (UCXBs) are a subclass of low-mass X-ray binaries characterized by tight orbits and degenerate donors, which pose significant challenges to our understanding of their formation. Recent discoveries of black hole …
View article: Unevolved Li-rich stars at low metallicity: A possible formation pathway through novae
Unevolved Li-rich stars at low metallicity: A possible formation pathway through novae Open
A small fraction of low-mass stars have been found to have anomalously high Li abundances. Although it has been suggested that mixing during the red giant branch phase can lead to Li production, this method of intrinsic Li production canno…
View article: Triple Evolution Pathways to Black Hole Low-mass X-Ray Binaries: Insights from V404 Cygni
Triple Evolution Pathways to Black Hole Low-mass X-Ray Binaries: Insights from V404 Cygni Open
A recent discovery shows that V404 Cygni, a prototypical black hole low-mass X-ray binary (BH-LMXB) is a hierarchical triple: the BH and donor star are orbited by a 1.2 M ⊙ tertiary at a distance of at least 3500 au. Motivated by this syst…
View article: Cataclysmic Variables in Triples: Formation Models and New Discoveries
Cataclysmic Variables in Triples: Formation Models and New Discoveries Open
The formation of cataclysmic variables (CVs) has long been modeled as a product of common envelope evolution (CEE) in isolated binaries. However, a significant fraction of intermediate-mass stars -- the progenitors of the white dwarfs (WDs…
View article: Once a Triple, Not Always a Triple: The Evolution of Hierarchical Triples That Yield Merged Inner Binaries
Once a Triple, Not Always a Triple: The Evolution of Hierarchical Triples That Yield Merged Inner Binaries Open
More than half of all main-sequence (MS) stars have one or more companions, and many of those with initial masses 10 yr) companions. Furthermore, both BSS binaries and DWDs exhibit signatures of WD birth kicks.
View article: Two Novel Hot Jupiter Formation Pathways: How White Dwarf Kicks Shape the Hot Jupiter Population
Two Novel Hot Jupiter Formation Pathways: How White Dwarf Kicks Shape the Hot Jupiter Population Open
The origin of Hot Jupiters (HJs) is disputed between a variety of in situ and ex situ formation scenarios. One of the early proposed ex situ scenarios was the Eccentric Kozai–Lidov (EKL) mechanism combined with tidal circularization, which…
View article: Triple Evolution Pathways to Black Hole Low-Mass X-ray Binaries: Insights from V404 Cygni
Triple Evolution Pathways to Black Hole Low-Mass X-ray Binaries: Insights from V404 Cygni Open
A recent discovery shows that V404 Cygni, a prototypical black hole low-mass X-ray binary (BH-LMXB) is a hierarchical triple: the BH and donor star are orbited by a $1.2$ M$_{\odot}$ tertiary at a distance of at least $3500$ au. Motivated …
View article: Two Novel Hot Jupiter Formation Pathways: How White Dwarf Kicks Shape the Hot Jupiter Population
Two Novel Hot Jupiter Formation Pathways: How White Dwarf Kicks Shape the Hot Jupiter Population Open
The origin of Hot Jupiters (HJs) is disputed between a variety of in situ and ex situ formation scenarios. One of the early proposed ex situ scenarios was the Eccentric Kozai-Lidov (EKL) mechanism combined with tidal circularization, which…
View article: Once a Triple, Not Always a Triple: The Evolution of Hierarchical Triples that Yield Merged Inner Binaries
Once a Triple, Not Always a Triple: The Evolution of Hierarchical Triples that Yield Merged Inner Binaries Open
More than half of all main-sequence (MS) stars have one or more companions, and many of those with initial masses 100 au), the more massive white dwarf (WD) is a merger product, implying that these DWD binaries were previously triples. Ove…
View article: Predicting the Dominant Formation Mechanism of Multiplanetary Systems
Predicting the Dominant Formation Mechanism of Multiplanetary Systems Open
Most, if not all, Sun-like stars host one or more planets, making multiplanetary systems commonplace in our Galaxy. We utilize hundreds of multiplanet simulations to explore the origin of such systems, focusing on their orbital architectur…
View article: Dynamical Evolution of White Dwarfs in Triples in the Era of Gaia
Dynamical Evolution of White Dwarfs in Triples in the Era of Gaia Open
The Gaia mission has detected many white dwarfs (WDs) in binary and triple configurations, and while observations suggest that triple-stellar systems are common in our Galaxy, not much attention was devoted to WDs in triples. For stability…
View article: Multiwavelength Characterization of the High-mass X-Ray Binary Population of M33
Multiwavelength Characterization of the High-mass X-Ray Binary Population of M33 Open
We present multiwavelength characterization of 65 high-mass X-ray binary (HMXB) candidates in M33. We use the Chandra ACIS survey of M33 (ChASeM33) catalog to select hard X-ray point sources that are spatially coincident with UV-bright poi…
View article: Dynamical Evolution of White Dwarfs in Triples in the Era of Gaia
Dynamical Evolution of White Dwarfs in Triples in the Era of Gaia Open
The $Gaia$ mission has detected many white dwarfs (WDs) in binary and triple configurations, and while observations suggest that triple stellar systems are common in our Galaxy, not much attention was devoted to WDs in triples. For stabili…
View article: Multiwavelength Characterization of the High Mass X-ray Binary Population of M33
Multiwavelength Characterization of the High Mass X-ray Binary Population of M33 Open
We present multi-wavelength characterization of 65 high mass X-ray binary (HMXB) candidates in M33. We use the Chandra ACIS survey of M33 (ChASeM33) catalog to select hard X-ray point sources that are spatially coincident with UV-bright po…