Search Publications
Blanco DECam Bulge Survey (BDBS) II: project performance, data analysis, and early science results
Clarkson, William I.; Kunder, Andrea; Johnson, Christian I. +7 more
The Blanco DECam Bulge Survey (BDBS) imaged more than 200 sq deg of the Southern Galactic bulge using the ugrizY filters of the Dark Energy Camera, and produced point spread function photometry of approximately 250 million unique sources. In this paper, we present details regarding the construction and collation of survey catalogues, and also disc…
NGTS-10b: the shortest period hot Jupiter yet discovered
Smalley, Barry; Jackman, James A. G.; Wheatley, Peter J. +44 more
We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of 2.162 ^{+0.092}_{-0.107} MJ and 1.205 ^{+0.117}_{-0.083} RJ and orbits its host star with a period of 0.7668944 ± 0.0000003 d, making it the shortest period hot Jupi…
Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations
Bauer, F. E.; Brandt, W. N.; Bianchi, S. +9 more
We present the results of the latest NuSTAR monitoring campaign of the Compton-thick Seyfert 2 galaxy NGC 1068, composed of four ∼50 ks observations performed between 2017 July and 2018 February to search for flux and spectral variability on time-scales from 1 to 6 months. We detect one unveiling and one eclipsing event with time-scales less than …
The distribution of relative proper motions of wide binaries in Gaia DR2: MOND or multiplicity?
Clarke, C. J.
We examine the distribution of on-sky relative velocities for wide binaries previously assembled from theGaia DR2 data and focus on the origin of the high-velocity tail of apparently unbound systems, which may be interpreted as evidence for non-Newtonian gravity in the weak field limit. We argue that this tail is instead explicable in terms of a p…
Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C
Bell, Eric F.; D'Eugenio, Francesco; Franx, Marijn +13 more
We use deep, spatially resolved spectroscopy from the Large Early Galaxy Astrophysics Census Survey to study radial variations in the stellar population of 17 spectroscopically selected post-starburst (PSB) galaxies. We use spectral fitting to measure two Lick indices, H δA and Fe 4383 , and find that, on average, PSB galaxies have radi…
Unsupervised machine learning for transient discovery in deeper, wider, faster light curves
Andreoni, Igor; Mahabal, Ashish; Cooke, Jeff +7 more
Identification of anomalous light curves within time-domain surveys is often challenging. In addition, with the growing number of wide-field surveys and the volume of data produced exceeding astronomers' ability for manual evaluation, outlier and anomaly detection is becoming vital for transient science. We present an unsupervised method for trans…
Atmospheric compositions and observability of nitrogen-dominated ultra-short-period super-Earths
Mollière, Paul; Tsai, Shang-Min; Miguel, Yamila +1 more
We explore the chemistry and observability of nitrogen-dominated atmospheres for ultra-short-period super-Earths. We base the assumption that super-Earths could have nitrogen-filled atmospheres on observations of 55 Cancri e that favour a scenario with a high-mean-molecular-weight atmosphere. We take Titan's elemental budget as our starting point …
Lithium and beryllium in the Gaia-Enceladus galaxy
Molaro, P.; Cescutti, G.; Fu, X.
Data from Gaia DR2 and The Apache Point Observatory Galactic Evolution Experiment surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a disrupted dwarf galaxy named Gaia-Enceladus that collided with the Milky Way about 10 Gyr ago. This merging event offers an extraordinary opportunity to…
SMASHing the low surface brightness SMC
Bell, Eric F.; Monachesi, Antonela; Choi, Yumi +22 more
The periphery of the Small Magellanic Cloud (SMC) can unlock important information regarding galaxy formation and evolution in interacting systems. Here, we present a detailed study of the extended stellar structure of the SMC using deep colour-magnitude diagrams, obtained as part of the Survey of the MAgellanic Stellar History (SMASH). Special ca…
Crystalline silicate absorption at 11.1 µm: ubiquitous and abundant in embedded YSOs and the interstellar medium
Wright, Christopher M.; Fujiyoshi, Takuya; Siebenmorgen, Ralf +5 more
Utilizing several instruments on 4-8 m telescopes, we have observed a large sample of objects in the mid-infrared (8-13 µm). These comprise a few evolved stars, multiple envelopes of embedded young stellar objects (YSOs) or compact H-II regions, and several sightlines through the interstellar medium (ISM). The latter is where dust resides - …