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The β Pictoris b Hill sphere transit campaign. I. Photometric limits to dust and rings
Wang, L.; Lecavelier des Etangs, A.; Stee, P. +33 more
Aims: Photometric monitoring of β Pic in 1981 showed anomalous fluctuations of up to 4% over several days, consistent with foreground material transiting the stellar disk. The subsequent discovery of the gas giant planet β Pic b and the predicted transit of its Hill sphere to within a 0.1 au projected separation of the planet provided an oppo…
Stellar loci IV. red giant stars
Yuan, Hai-Bo; Huang, Yang; Chen, Bing-Qiu +3 more
In the fourth paper of this series, we present the metallicity-dependent Sloan Digital Sky Survey (SDSS) stellar color loci of red giant stars, using a spectroscopic sample of red giants in the SDSS Stripe 82 region. The stars span a range of 0.55 - 1.2 mag in color g - i, -0.3 - -2.5 in metallicity [Fe/H], and have values of surface gravity log g…
Discovery of a Protocluster Core Associated with an Enormous Lya Nebula at z = 2.3
Fan, Xiaohui; Cai, Zheng; Li, Qiong +10 more
The MAMMOTH-1 nebula at z = 2.317 is an enormous Lyα nebula (ELAN) extending to a ~440 kpc scale at the center of the extreme galaxy overdensity BOSS 1441. In this paper, we present observations of the CO(3 - 2) and 250 GHz dust-continuum emission from MAMMOTH-1 using the IRAM NOrthern Extended Millimeter Array. Our observations show that CO(3 - 2…
Radio evidence for a shock wave reflected by a coronal hole
Bemporad, A.; Frassati, F.; Giordano, S. +4 more
We report the first unambiguous observational evidence in the radio range of the reflection of a coronal shock wave at the boundary of a coronal hole. The event occurred above an active region located at the northwest limb of the Sun and was characterized by an eruptive prominence and an extreme-ultraviolet wave steepening into a shock. The EUV ob…
A Spatially Resolved Survey of Distant Quasar Host Galaxies. II. Photoionization and Kinematics of the ISM
Armus, Lee; Larkin, James E.; Wright, Shelley A. +6 more
We present detailed observations of photoionization conditions and galaxy kinematics in 11 z = 1.39-2.59 radio-loud quasar host galaxies. Data were taken with the OSIRIS integral field spectrograph and the adaptive optics system at the W. M. Keck Observatory that targeted nebular emission lines (Hβ, [O III], Hα, [N II]) redshifted into the near-in…
The ultraviolet luminosity function of star-forming galaxies between redshifts of 0.6 and 1.2
McHardy, I.; Page, M. J.; Symeonidis, M. +11 more
We use ultraviolet (UV) imaging taken with the XMM-Newton Optical Monitor telescope (XMM-OM), covering 280 arcmin2 in the UVW1 band (λeff = 2910 Å) to measure rest-frame UV 1500-Å luminosity functions of galaxies with redshifts z between 0.6 and 1.2. The XMM-OM data are supplemented by a large body of optical and infrared ima…
A stellar census in globular clusters with MUSE. A new perspective on the multiple main sequences of ω Centauri
Dreizler, S.; Latour, M.; Brinchmann, J. +3 more
Context. ω Cen is a rare example of a globular cluster where the iron abundance of the stars spans more than one order of magnitude. Many spectroscopic investigations of its red-giant and sub-giant branches have revealed multiple peaks in the iron abundance distribution. The metallicity distribution of main sequence (MS) stars is not well characte…
Years-delayed X-Ray Afterglows of TDEs Originated from Wind-Torus Interactions
Wang, Wei; Shu, Xinwen; Jiang, Ning +8 more
Tidal disruption events (TDEs) occurring in active galactic nuclei (AGNs) are a special class of sources with outstanding scientific significance. TDEs can generate ultrafast winds, which should almost inevitably collide with the preexisting AGN dusty tori. We perform analytical calculations and simulations on the wind-torus interactions and find …
Mid-infrared reflectance spectroscopy of synthetic glass analogs for Mercury surface studies
Helbert, Joern; Hiesinger, Harald; Weber, Iris +14 more
We have synthesized and analyzed by mid-infrared reflectance spectroscopy silicate glasses that are representative for the glasses on the surface of Mercury. The glass compositions are based on high-pressure laboratory experiments and the resulting compositions of the glass phase. The spectra are of interest for investigating the surface of Mercur…
NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey
Wheatley, Peter J.; Bayliss, Daniel; Worters, Hannah L. +36 more
We report the discovery of four new hot Jupiters with the Next-Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period (P < 5 d) planets orbiting G-type main-sequence stars, with radii and masses between 1.10 and 1.30RJ and 0.41 and 0.76MJ, respectively. By considering the host star lu…