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WASP-147b, 160Bb, 164b, and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts
Bouchy, F.; Queloz, D.; Ségransan, D. +20 more
We report the discovery of four transiting hot Jupiters, WASP-147, WASP-160B, WASP-164, and WASP-165 from the WASP survey. WASP-147b is a near Saturn-mass (MP = 0.28MJ) object with a radius of 1.11 {{R}J} orbiting a G4 star with a period of 4.6 d. WASP-160Bb has a mass and radius (M_p = 0.28 {{M}J}, R_p …
On the existence of bright IR galaxies at z > 2: tension between Herschel and SCUBA-2 results?
Pozzi, Francesca; Gruppioni, Carlotta
Recent derivations of the galaxy star formation rate density (SFRD) obtained from sub-millimetre (sub-mm) surveys (e.g. SCUBA-2) show a tension with previous works based on Herschel and multi-wavelength data. Some of these works claim that the SFRD derived by pushing the Herschel surveys beyond z ≃ 2 are incorrect. However, the current sub-mm surv…
Building a cluster: shocks, cavities, and cooling filaments in the group-group merger NGC 6338
Vrtilek, Jan M.; David, Laurence P.; Sun, Ming +4 more
We present deep Chandra, XMM-Newton, Giant Metrewave Radio Telescope, and Hα observations of the group-group merger NGC 6338. X-ray imaging and spectral mapping show that as well as trailing tails of cool, enriched gas, the two cool cores are embedded in an extensive region of shock-heated gas with temperatures rising to ∼5 keV. The velocity distr…
Study of the long-term evolution of the accretion dynamics of GX 339-4
Mandal, S.; Aneesha, U.; Sreehari, H.
We study the dynamical behaviour of the galactic black hole source GX 339-4 during 2002-2011 outbursts using RXTE, Swift-XRT, XMM-Newton (PN) archival data. We present the spectral evolution of the source using four outburst data and discuss their similarities and differences between outbursts. We infer that the second peak in the 2002/03 and 2004…
Dynamics of wind and the dusty environments in the accreting T Tauri stars RY Tauri and SU Aurigae
Grankin, K. N.; Irsmambetova, T. R.; Gahm, G. F. +10 more
Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of simultaneous spectroscopic and photometric observations of the classical T Tauri stars, RY Tauri a…
Probability of magnification in the HubbleFrontier Fields clusters
Diego, J. M.; Bernstein, G. M.; Vega-Ferrero, J.
We present free-form gravitational lensing models derived with the WSLAP+ code for the six HubbleFrontier Fields clusters using the latest data available from the Frontier Fields Lensing Models v.4 collaboration. We present magnification maps in the lens plane and caustic maps in the source plane. From these maps, we derive the probability of magn…
Suppressed CO emission and high G/D ratios in z = 2 galaxies with sub-solar gas-phase metallicity
Daddi, E.; Béthermin, M.; Sargent, M. T. +6 more
We study a population of significantly sub-solar enrichment galaxies at z = 1.99, to investigate how molecular gas, dust, and star formation relate in low-metallicity galaxies at the peak epoch of star formation. We target our sample with several deep Atacama Large Millimeter/submillimeter Array and Very Large Array datasets, and find no individua…
ALMA reveals a pseudo-disc in a proto-brown dwarf
Riaz, B.; Stamatellos, D.; Machida, M. N.
We present the observational evidence of a pseudo-disc around the proto-brown dwarf Mayrit 1701117, the driving source of the large-scale HH 1165 jet. Our analysis is based on Atacama Large Millimeter/submillimeter Array 12CO (2-1) line and 1.37 mm continuum observations at an angular resolution of ∼0.4 arcsec. The pseudo-disc is a brig…
Imprints of the first billion years: Lyman limit systems at z ∼ 5
Worseck, Gábor; Prochaska, J. Xavier; Murphy, Michael T. +3 more
Lyman limit systems (LLSs) trace the low-density circumgalactic medium and the most dense regions of the intergalactic medium, so their number density and evolution at high-redshift, just after reionization, are important to constrain. We present a survey for LLSs at high redshifts, zLLS = 3.5-5.4, in the homogeneous data set of 153 opt…
The GALAH survey: co-orbiting stars and chemical tagging
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +24 more
We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Ga…