Search Publications
Von Zeipel - Lidov - Kozai cycles in action: Kepler triples with eclipse depth variations: KICs 6964043, 5653126, 5731312, and 8023317
Mitnyan, T.; Moe, M.; Toonen, S. +3 more
We report the results of the photodynamical analyses of four compact, tight triple stellar systems, KICs 6964043, 5653126, 5731312, and 8023317, based largely on Kepler and TESS data. All systems display remarkable eclipse timing and eclipse depth variations, the latter implying a non-aligned outer orbit. Moreover, KIC 6964043 is also a triply ecl…
The post-common-envelope binary central star of the planetary nebula Ou 5: a doubly eclipsing post-red-giant-branch system
Corradi, Romano L. M.; Parsons, Steven G.; Munday, James +10 more
We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou 5. Low-resolution spectra obtained during the primary eclipse - to our knowledge the first isolated spectra of the companion to a post-common-envelope planetary nebula central star - were compared to catalogu…
The VMC survey - XLVI. Stellar proper motions in the centre of the Large Magellanic Cloud
de Grijs, Richard; Ripepi, Vincenzo; Cioni, Maria-Rosa L. +7 more
We present proper motion (PM) measurements within the central region of the Large Magellanic Cloud (LMC), using near-infrared data from the VISTA survey of the Magellanic Cloud system (VMC). This work encompasses 18 VMC tiles covering a total sky area of ~28 deg2. We computed absolute stellar PMs from multiepoch observations in the K
Deep diving off the 'Cosmic Cliffs': previously hidden outflows in NGC 3324 revealed by JWST
Smith, Nathan; Reiter, Megan; Morse, Jon A. +3 more
We present a detailed analysis of the protostellar outflow activity in the massive star-forming region NGC 3324, as revealed by new Early Release Observations (EROs) from the James Webb Space Telescope (JWST). Emission from numerous outflows is revealed in narrow-band images of hydrogen Paschen α (Paα) and molecular hydrogen. In particular, we rep…
Discovery of a coherent, wave-like velocity pattern for the Radcliffe wave
Li, Guang-Xing; Chen, Bing-Qiu
Recent studies discovered that part of the Gould Belt belongs to a 2.7 kpc-long coherent, thin wave consisting of a chain of clouds, where a damped undulation pattern has been identified from the spatial arrangement of the clouds. We use the proper motions of young stellar objects anchored inside the clouds to study the kinematic structure of the …
Inferring the rotation period distribution of stars from their projected rotation velocities and radii: Application to late-F/early-G Kepler stars
Petigura, Erik A.; Hall, Oliver J.; Masuda, Kento
While stellar rotation periods Prot may be measured from broad-band photometry, the photometric modulation becomes harder to detect for slower rotators, which could bias measurements of the long-period tail of the Prot distribution. Alternatively, the Prot distribution of stars can be inferred from their projected …
Local Group timing argument and virial theorem mass estimators from cosmological simulations
Strigari, Louis E.; Hartl, Odelia V.
We identify Local Group (LG) analogues in the IllustrisTNG cosmological simulation, and use these to study two-mass estimators for the LG: One based on the timing argument (TA) and one based on the virial theorem (VT). Including updated measurements of the Milky Way-M31 tangential velocity and the cosmological constant, we show that the TA mass es…
Dark lenses through the dust: parallax microlensing events in the VVV
McGill, Peter; Smith, Leigh C.; Wyrzykowski, Łukasz +4 more
We use near-infrared photometry and astrometry from the VISTA Variables in the Via Lactea (VVV) survey to analyse microlensing events containing annual microlensing parallax information. These events are located in highly extincted and low-latitude regions of the Galactic bulge typically off-limits to optical microlensing surveys. We fit a catalog…
HD 28109 hosts a trio of transiting Neptunian planets including a near-resonant pair, confirmed by ASTEP from Antarctica
Triaud, Amaury H. M. J.; Quinn, Samuel N.; Stassun, Keivan G. +28 more
We report on the discovery and characterization of three planets orbiting the F8 star HD 28109, which sits comfortably in ${TESS}$'s continuous viewing zone. The two outer planets have periods of $\rm 56.0067 \pm 0.0003~d$ and $\rm 84.2597_{-0.0008}^{+0.0010}~d$, which implies a period ratio very close to that of the first-order 3:2 mean motion re…
WIYN open cluster study: The old open cluster, NGC 188, and a re-evaluation of Lithium-richness among red giants
Cummings, Jeffrey D.; Twarog, Bruce A.; Anthony-Twarog, Barbara J. +3 more
We present WIYN1/Hydra spectra of 34 red giant candidate members of NGC 188, which, together with WOCS2 and Gaia data yield 23 single members, 6 binary members, 4 single non-members, and 1 binary non-member. We report [Fe/H] for 29 members and derive [Fe/H]NGC188 = +0.064 ± 0.018 dex (σµ) (sky spec…