Search Publications
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…
Neutron-capture elements record the ordered chemical evolution of the disc over time
Buder, Sven; Ness, Melissa K.; Horta, Danny +2 more
An ensemble of chemical abundances probing different nucleosynthetic channels can be leveraged to build a comprehensive understanding of the chemical and structural evolution of the Galaxy. Using GALAH DR3 data, we seek to trace the enrichment by the supernovae Ia, supernovae II, asymptotic giant branch stars, and neutron-star mergers and/or colla…
Serendipitous discovery of radio flaring behaviour from a nearby M dwarf with MeerKAT
Buckley, David A. H.; Osten, Rachel A.; Lintott, Chris J. +12 more
We report on the detection of MKT J174641.0-321404, a new radio transient found in untargeted searches of wide-field MeerKAT radio images centred on the black hole X-ray binary H1743-322. MKT J174641.0-321404 is highly variable at 1.3 GHz and was detected three times during 11 observations of the field in late 2018, reaching a maximum flux density…
Thermal and non-thermal X-ray emission from the rotation-powered radio/γ-ray pulsar PSR J1740+1000
Mereghetti, Sandro; Turolla, Roberto; Zane, Silvia +4 more
We report the results of new XMM-Newton observations of the middle-aged (τc = 1.1 × 105 yr) radio pulsar PSR J1740+1000 carried out in 2017-2018. These long pointings (~530 ks) show that the non-thermal emission, well described by a power-law spectrum with photon index Γ = 1.80 ± 0.17, is pulsed with a ~30 per cent pulsed fra…