Search Publications
Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk
Dong, Ruobing; Wilner, David J.; Andrews, Sean M. +3 more
We analyze the highest-resolution millimeter continuum and near-infrared (NIR) scattered-light images presented to date of the circumbinary disk orbiting V4046 Sgr, a ∼20-Myr-old actively accreting, close binary T Tauri star system located a mere 72.4 pc from Earth. We observed the disk with the Atacama Large Millimeter/submillimeter Array (ALMA) …
Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations
Koutchmy, S.; Tavabi, E.
To study motions and oscillations in the solar chromosphere and at the transition region level we analyze some extreme Doppler shifts observed off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans and slit-jaw imaging observations performed in the near-ultraviolet channels were used. Large transverse oscillations are reveale…
Limits on the Electromagnetic Counterpart of Binary Black Hole Coalescence at Visible Wavelengths
Turpin, Damien; Laugier, Romain; Noysena, Kanthanakorn +4 more
We used the Télescope à Action Rapide pour les Objets Transitoires network of telescopes to search for the electromagnetic counterparts of GW150914, GW170104, and GW170814, which were reported to originate from binary black hole merger events by the Laser Interferometer Gravitational-wave Observatory and Virgo collaborations. Our goal is to constr…
The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star population
Hatzidimitriou, D.; Bonanos, A. Z.; Yang, M. +2 more
Studies of the massive star population in galaxies beyond the Local Group are the key to understanding the link between their numbers and modes of star formation in different environments. We present the analysis of the massive star population of the galaxies NGC 1326A, NGC 1425, and NGC 4548 using archival images obtained with the Hubble Space Te…
Spectral imaging of the thermal Sunyaev-Zel'dovich effect in X-COP galaxy clusters: method and validation
Baldi, A. S.; Bourdin, H.; Mazzotta, P. +4 more
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe the thermal pressure of the intra-cluster gas, especially in the outermost regions where X-ray observations suffer from photon statistics. For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm fo…
Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +37 more
Aims: We provide a detailed quantitative analysis of isolated boulder fields situated in three different regions of comet 67P/Churyumov-Gerasimenko: Imhotep, Hapi, and Hatmehit. This is done to supply a useful method for analyzing the morphology of the boulders and to characterize the regions themselves.
Methods: We used OSIRIS Narrow An…
Chemical evolution of HC3N in dense molecular clouds
Wang, Jun-Jie; Xu, Jin-Long; Yu, Naiping
We investigated the chemical evolution of HC3N in six dense molecular clouds, using archival available data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). Radio sky surveys of the Multi-Array Galactic Plane Imaging Survey (MAGPIS) and the Sydney University Mo…
CCD Photometry, Light Curve Deconvolution, Period Analysis, Kinematics, and Evolutionary Status of the HADS Variable V460 Andromedae
Alton, K. B.; Stepien, K.
Multi-color (BVIc) CCD-derived photometric data were acquired from V460 And, an intrinsic variable classically defined as a High Amplitude delta Scuti (HADS) type system. Deconvolution of precise time-series light curve data was accomplished using discrete Fourier transformation and revealed a fundamental mode (f0) of oscillation at 13.336 d-1 alo…
Multispacecraft Study of the Interaction Between an Interplanetary Shock and a Solar Wind Flux Rope
Burgess, D.; Blanco-Cano, X.; Kajdič, P. +1 more
Interplanetary (IP) shocks are driven in the heliosphere by fast coronal ejecta, they can accelerate particles and are associated with solar energetic particle and energetic storm particle events. IP shocks can interact with structures in the solar wind and with magnetospheres. We show how the properties of an IP shock change when it interacts wit…
New variable stars towards the Galactic Bulge - I. The bright regime
Rejkuba, M.; Anderson, J.; Zoccali, M. +8 more
We report the detection of 3714 variable stars towards the Galactic bulge, including 2521 previously uncatalogued variables, using time-series photometry extracted from data obtained with the VIMOS imager at the Very Large Telescope. Observations of the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) field in the Galactic Bulge were…