Search Publications
Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55
Castro, N.; Negueruela, I.; Tabernero, H. M. +2 more
Classical Cepheids in open clusters play an important role in benchmarking stellar evolution models, in addition to anchoring the cosmic distance scale and invariably securing the Hubble constant. Three pertinent clusters hosting classical Cepheids and red (super)giants are: NGC 6649, NGC 6664, and Berkeley 55. These clusters form the basis of ana…
Color and aerosol changes in Jupiter after a North Temperate Belt disturbance
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Irwin, P. G. J. +5 more
The banded appearance of Jupiter's atmosphere shows significant changes over time, sometimes even transforming the reflectivity of a whole latitudinal band in a few weeks, and staying for years with an aspect different from the usual one. The origin of some of these disturbances may be associated with the creation and destruction of the chromophor…
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. IV. The Largest Broad Absorption Line Acceleration
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
We present an analysis of the broad absorption line (BAL) velocity shift that appeared in one of the outflow systems in quasar SDSS J1042+1646. Observations were taken by the Hubble Space Telescope/Cosmic Origins Spectrograph in 2011 and 2017 in the 500-1050 Å rest frame. The outflow's velocity centroid shifted by ∼-1550 km s-1 from -19…
Thermal and non-thermal X-ray emission from stellar clusters and superbubbles
Kavanagh, Patrick J.
Massive stellar clusters inject significant mass and energy into their surroundings driving superbubbles, 100–1000 pc diameter shells of swept-up interstellar material that contain a hot (
Distribution of physical parameters for 380 contact binaries in the Kepler field
Zhu, Li-Ying; Liu, Liang; Li, Xu-Zhi
We present the physical parameters (p, T, q, i, f) of 380 Kepler contact binary systems (hereafter called CBs). A statistical study on the CBs is carried out based on a Kepler photometric database. Our samples were selected from the Kepler Eclipsing Binary Catalogue of EW-type eclipsing binaries with periods around 0.2-1 d and amplitudes greater t…
Quiet-Sun hydrogen Lyman-α line profile derived from SOHO/SUMER solar-disk observations
Heinzel, P.; Gunár, S.; Schwartz, P. +1 more
Context. The solar radiation in the Lyman-α spectral line of hydrogen plays a significant role in the illumination of chromospheric and coronal structures, such as prominences, spicules, chromospheric fibrils, cores of coronal mass ejections, and solar wind. Moreover, it is important for the investigation of the heliosphere, Earth's ionosphere, an…
Optical follow-up of gravitational wave triggers with DECam during the first two LIGO/VIRGO observing runs
Berger, E.; Bechtol, K.; Smith, M. +82 more
Gravitational wave (GW) events detectable by LIGO and Virgo have several possible progenitors, including black hole mergers, neutron star mergers, black hole-neutron star mergers, supernovae, and cosmic string cusps. A subset of GW events is expected to produce electromagnetic (EM) emission that, once detected, will provide complementary informati…
The Bathymetry of Moray Sinus at Titan's Kraken Mare
Lunine, J. I.; Hayes, A. G.; Le Gall, A. +4 more
Moray Sinus is an estuary located at the northern end of Titan's Kraken Mare. The Cassini RADAR altimeter acquired three segments over this mare during the T104 flyby of Titan, on August 21, 2014. Herein, we present a detailed analysis of the received echoes. Some of these waveforms exhibit a reflection from the seafloor, from up to 85-18+28 m of …
Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
Schlieder, Joshua E.; Petigura, Erik A.; Crossfield, Ian J. M. +5 more
Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Implementing a broken power law for both the period and radius distributions, we find an overall planet occurrence of…
Resolving Decades of Periodic Spirals from the Wolf-Rayet Dust Factory WR 112
Moffat, Anthony F. J.; Stevens, Ian R.; Sakon, Itsuki +9 more
WR 112 is a dust-forming carbon-rich Wolf-Rayet (WC) binary with a dusty circumstellar nebula that exhibits a complex asymmetric morphology, which traces the orbital motion and dust formation in the colliding winds of the central binary. Unraveling the complicated circumstellar dust emission around WR 112 therefore provides an opportunity to under…