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The X-shooter Spectral Library (XSL): Data Release 3
Peletier, R. F.; Arentsen, A.; Coelho, P. R. T. +12 more
We present the third data release (DR3) of the X-shooter Spectral Library (XSL). This moderate-to-high resolution, near-ultraviolet-to-near-infrared (350-2480 nm, R ∼ 10 000) spectral library is composed of 830 stellar spectra of 683 stars. DR3 improves upon the previous data release by providing the combined de-reddened spectra of the three X-sho…
High Equivalent Width of Hα+[N II] Emission in z 8 Lyman-break Galaxies from IRAC 5.8 µm Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +3 more
We measure, for the first time, the median equivalent width (EW) of Hα+[N II] in star-forming galaxies at z ~ 8. Our estimate leverages the unique photometric depth of the Spitzer/IRAC 5.8 µm band mosaics (probing ≈5500-7100 Å at z ~ 8) of the GOODS Reionization Era Wide Area Treasury from Spitzer (GREATS) program. We median-stacked the stam…
MHD disc winds can reproduce fast disc dispersal and the correlation between accretion rate and disc mass in Lupus
Lodato, G.; van Dishoeck, E. F.; Tabone, B. +3 more
The final architecture of planetary systems depends on the extraction of angular momentum and mass-loss processes of the discs in which they form. Theoretical studies proposed that magnetohydrodynamic winds launched from the discs (MHD disc winds) could govern accretion and disc dispersal. In this work, we revisit the observed disc demographics in…
Chemical Cartography with APOGEE: Mapping Disk Populations with a 2-process Model and Residual Abundances
Bizyaev, Dmitry; Pan, Kaike; Schneider, Donald P. +33 more
We apply a novel statistical analysis to measurements of 16 elemental abundances in 34,410 Milky Way disk stars from the final data release (DR17) of APOGEE-2. Building on recent work, we fit median abundance ratio trends [X/Mg] versus [Mg/H] with a 2-process model, which decomposes abundance patterns into a "prompt" component tracing core-collaps…
Gas Disk Sizes from CO Line Observations: A Test of Angular Momentum Evolution
Wilner, David J.; Tabone, Benoît; Andrews, Sean M. +7 more
The size of a disk encodes important information about its evolution. Combining new Submillimeter Array observations with archival Atacama Large Millimeter/submillimeter Array data, we analyze millimeter continuum and CO emission line sizes for a sample of 44 protoplanetary disks around stars with masses of 0.15-2 M ⊙ in several nearby …
Cosmological Results from the RAISIN Survey: Using Type Ia Supernovae in the Near Infrared as a Novel Path to Measure the Dark Energy Equation of State
Kirshner, R. P.; Smith, M.; Nichol, R. C. +26 more
Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than in the optical. With this motivation, from 2012 to 2017 we embarked on the RAISIN program with the Hubble Space Telescope (HST) to obtain rest-frame NIR light curves for a cosmologically distant sample of 37 SNe Ia (0.2 ≲ z ≲ 0.6) disc…
Inference of the cosmic rest-frame from supernovae Ia
Horstmann, Nick; Pietschke, Yannic; Schwarz, Dominik J.
We determine the proper motion of the Solar System from the Pantheon sample of type Ia supernovae (SNe). The posterior distribution of the Solar System proper velocity, its direction, and relevant cosmological parameters were obtained based on the observed distance moduli, heliocentric redshifts, and positions of SNe by means of a Markov chain Mon…
A deep survey of short GRB host galaxies over z 0-2: implications for offsets, redshifts, and environments
Troja, E.; Cenko, S. B.; Sakamoto, T. +10 more
A significant fraction (30 per cent) of well-localized short gamma-ray bursts (sGRBs) lack a coincident host galaxy. This leads to two main scenarios: (i) that the progenitor system merged outside of the visible light of its host, or (ii) that the sGRB resided within a faint and distant galaxy that was not detected by follow-up observations. Discr…
ALMA 200 pc Imaging of a z 7 Quasar Reveals a Compact, Disk-like Host Galaxy
Carilli, Chris; Fan, Xiaohui; Neeleman, Marcel +10 more
We present 0.″035 resolution (~200 pc) imaging of the 158 µm [C II] line and the underlying dust continuum of the z = 6.9 quasar J234833.34-305410.0. The 18 hour Atacama Large Millimeter/submillimeter Array observations reveal extremely compact emission (diameter ~1 kpc) that is consistent with a simple, almost face-on, rotation-supported di…
A 5 per cent measurement of the Hubble-Lemaître constant from Type II supernovae
Zheng, W.; Galbany, L.; Filippenko, A. V. +4 more
The most stringent local measurement of the Hubble-Lemaître constant from Cepheid-calibrated Type Ia supernovae (SNe Ia) differs from the value inferred via the cosmic microwave background radiation (Planck+ΛCDM) by ~5σ. This so-called Hubble tension has been confirmed by other independent methods, and thus does not appear to be a possible consequ…