Search Publications
The XMM Cluster Survey analysis of the SDSS DR8 redMaPPer catalogue: implications for scatter, selection bias, and isotropy in cluster scaling relations
Nichol, R. C.; Miller, C. J.; Romer, A. K. +21 more
In this paper, we present the X-ray analysis of Sloan Digital Sky Survey DR8 redMaPPer (SDSSRM) clusters using data products from the XMM Cluster Survey (XCS). In total, 1189 SDSSRM clusters fall within the XMM-Newton footprint. This has yielded 456 confirmed detections accompanied by X-ray luminosity (LX) measurements. Of these cluster…
New binaries from the SHINE survey
Moutou, C.; Rouan, D.; Avenhaus, H. +68 more
We present the multiple stellar systems observed within the SpHere INfrared survey for Exoplanet (SHINE). SHINE searched for sub-stellar companions to young stars using high contrast imaging. Although stars with known stellar companions within the SPHERE field of view (< 5.5 arcsec) were removed from the original target list, we detected additi…
Deep images of the Galactic center with GRAVITY
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +65 more
Stellar orbits at the Galactic Center provide a very clean probe of the gravitational potential of the supermassive black hole. They can be studied with unique precision, beyond the confusion limit of a single telescope, with the near-infrared interferometer GRAVITY. Imaging is essential to search the field for faint, unknown stars on short orbits…
Dissecting the Different Components of the Modest Accretion Bursts of the Very Young Protostar HOPS 373
Herczeg, Gregory J.; Manoj, P.; Johnstone, Doug +11 more
Observed changes in protostellar brightness can be complicated to interpret. In our James Clerk Maxwell Telescope (JCMT) Transient Monitoring Survey, we discovered that a young binary protostar, HOPS 373, is undergoing a modest 30% brightness increase at 850 µm, caused by a factor of 1.8-3.3 enhancement in the accretion rate. The initial bur…
A 38 Million Year Old Neptune-sized Planet in the Kepler Field
Tamura, M.; Narita, N.; Bouma, L. G. +12 more
Kepler 1627A is a G8V star previously known to host a 3.8 R ⊕ planet on a 7.2 day orbit. The star was observed by the Kepler space telescope because it is nearby (d = 329 pc) and it resembles the Sun. Here, we show using Gaia kinematics, TESS stellar rotation periods, and spectroscopic lithium abundances that Kepler 1627 is a member of …
Searching Far and Long. I. Pilot ALMA 2 mm Follow-up of Bright Dusty Galaxies as a Redshift Filter
Casey, Caitlin M.; Long, Arianna S.; Zavala, Jorge A. +5 more
A complete census of dusty star-forming galaxies (DSFGs) at early epochs is necessary to constrain the obscured contribution to the cosmic star formation rate density (CSFRD); however, DSFGs beyond z ~ 4 are both rare and hard to identify from photometric data alone due to degeneracies in submillimeter photometry with redshift. Here, we present a …
On the Stability of Tidal Streams in Action Space
Wetzel, Andrew; Cunningham, Emily C.; Sanderson, Robyn E. +3 more
In the Gaia era it is increasingly apparent that traditional static, parameterized models are insufficient to describe the mass distribution of our complex, dynamically evolving Milky Way (MW). In this work, we compare different time-evolving and time-independent representations of the gravitational potentials of simulated MW-mass galaxies from th…
India's First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope
Angchuk, Dorje; De, Kishalay; Fremling, Christoffer +35 more
We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0.°82 field of view and a sensitivity of m g' ~ 20.5 in 5 minute exposures. Custom software handles observatory operations: attaining …
RR Lyrae and Type II Cepheid Variables in Globular Clusters: Optical and Infrared Properties
Bhardwaj, Anupam
Globular clusters are both primary fossils of galactic evolution and formation and are ideal laboratories for constraining the evolution of low-mass and metal-poor stars. RR Lyrae and type II Cepheid variables are low-mass, radially pulsating stars that trace old-age stellar populations. These stellar standard candles in globular clusters are cruc…
Five young δ Scuti stars in the Pleiades seen with Kepler/K2
Li, Yaguang; Bedding, Timothy R.; White, Timothy R. +4 more
We perform mode identification for five δ Scuti stars in the Pleiades star cluster, using custom light curves from K2 photometry. By creating échelle diagrams, we identify radial and dipole mode ridges, comprising a total of 28 radial and 16 dipole modes across the five stars. We also suggest possible identities for those modes that lie offset fro…