Search Publications
A high-resolution view of the filament of gas between Abell 399 and Abell 401 from the Atacama Cosmology Telescope and MUSTANG-2
Sarazin, Craig L.; Hilton, Matt; Sifón, Cristóbal +43 more
We report a significant detection of the hot intergalactic medium in the filamentary bridge connecting the galaxy clusters Abell 399 and Abell 401. This result is enabled by a low-noise, high-resolution map of the thermal Sunyaev-Zeldovich signal from the Atacama Cosmology Telescope (ACT) and Planck satellite. The ACT data provide the 1.65 arcmin …
Orbital architectures of planet-hosting binaries - II. Low mutual inclinations between planetary and stellar orbits
Huber, Daniel; Kratter, Kaitlin M.; Rizzuto, Aaron C. +4 more
Planet formation is often considered in the context of one circumstellar disc around one star. Yet, stellar binary systems are ubiquitous, and thus a substantial fraction of all potential planets must form and evolve in more complex, dynamical environments. We present the results of a 5 yr astrometric monitoring campaign studying 45 binary star sy…
Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
Sollerman, J.; Reichart, D. E.; Harrison, D. L. +68 more
We present the results from a high-cadence, multiwavelength observation campaign of AT 2016jbu (aka Gaia16cfr), an interacting transient. This data set complements the current literature by adding higher cadence as well as extended coverage of the light-curve evolution and late-time spectroscopic evolution. Photometric coverage reveals that AT 201…
The globular clusters and star formation history of the isolated, quiescent ultra-diffuse galaxy DGSAT I
van Dokkum, Pieter G.; Forbes, Duncan A.; Romanowsky, Aaron J. +6 more
We investigate the isolated, quiescent ultra-diffuse galaxy (UDG) DGSAT I and its globular cluster (GC) system using two orbits of Hubble Space Telescope Advanced Camera for Surveys imaging in the F606W and F814W filters. This is the first study of GCs around a UDG in a low-density environment. DGSAT I was previously found to host an irregular blu…
Dynamical state of galaxy clusters evaluated from X-ray images
Yuan, Z. S.; Han, J. L.; Wen, Z. L.
X-ray images of galaxy clusters often show disturbed structures that are indications of cluster mergers. To complement our previous work on the dynamical state of 964 clusters observed by Chandra, we process the X-ray images for 1308 clusters from XMM-Newton archival data, together with the images of 22 clusters newly released by Chandra, and we e…
The detailed chemical abundance patterns of accreted halo stars from the optical to infrared
Hawkins, Keith; Lucey, Madeline; Jofré, Paula +3 more
Understanding the assembly of our Galaxy requires us to also characterize the systems that helped build it. In this work, we accomplish this by exploring the chemistry of accreted halo stars from Gaia-Enceladus/Gaia-Sausage (GES) selected in the infrared from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) Data Release 16. We u…
Modelling the water and carbon dioxide production rates of Comet 67P/Churyumov-Gerasimenko
Samarasinha, Nalin H.; Farnocchia, Davide; Gutiérrez, Pedro J. +1 more
The European Space Agency Rosetta/Philae mission to Comet 67P/Churyumov-Gerasimenko in 2014-2016 is the most complete and diverse investigation of a comet carried out thus far. Yet, many physical and chemical properties of the comet remain uncertain or unknown, and cometary activity is still not a well-understood phenomenon. We here attempt to pla…
New LZ and PW(Z) relations of RR Lyrae stars calibrated with Gaia EDR3 parallaxes
Sarro, L. M.; Clementini, G.; Ripepi, V. +4 more
We present new luminosity-metallicity (LZ; $M_{V}\!-\!\rm [Fe/H]$ and $M_{G}\!-\!\rm [Fe/H]$) relations and, for the first time, empirical, Gaia three-band (G, GBP, GRP) period-Wesenheit-metallicity (PWZ) relations of RR Lyrae stars (RRLs) derived using a hierarchical Bayesian approach and new accurate parallaxes published fo…
Birth of a Be star: an APOGEE search for Be stars forming through binary mass transfer
Conroy, Charlie; Stassun, Keivan G.; Cargile, Phillip +7 more
Motivated by recent suggestions that many Be stars form through binary mass transfer, we searched the APOGEE survey for Be stars with bloated, stripped companions. From a well-defined parent sample of 297 Be stars, we identified one mass-transfer binary, HD 15124. The object consists of a main-sequence Be star ($M_{\rm Be}=5.3\pm 0.6\, {\rm M}_{\o…
Study of changes in the pulsation period of 148 Galactic Cepheid variables
Szabados, L.; Cseh, B.; Molnár, L. +7 more
Investigating period changes of classical Cepheids through the framework of O - C diagrams provides a unique insight to the evolution and nature of these variable stars. In this work, the new or extended O - C diagrams for 148 Galactic classical Cepheids are presented. By correlating the calculated period change rates with the Gaia EDR3 colours, w…