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Supernova SN 2011fe from an exploding carbon–oxygen white dwarf star

Early observations of type Ia supernova SN 2011fe in the galaxy M101 at a distance from Earth of 6.4 megaparsecs find that the exploding star was probably a carbon–oxygen white dwarf, and from the lack of an early shock it is concluded that the companion was likely a main-sequence star.
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A kilonova as the electromagnetic counterpart to a gravitational-wave source

Observations and physical modelling of a rapidly fading electromagnetic transient in the galaxy NGC 4993, which is spatially coincident with GW170817, indicate that neutron-star mergers produce gravitational waves and radioactively powered kilonovae, and are a nucleosynthetic source of the r-process elements.
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Bolometric light curves and explosion parameters of 38 stripped-envelope core-collapse supernovae

Literature data are collated for 38 stripped-envelope core-collapse supernovae (SE SNe; i.e. SNe IIb, Ib, Ic and Ic-BL) that have good light curve coverage in more than one optical band. Using…
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Multi-messenger Observations of a Binary Neutron Star Merger

On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced…
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The Hα Galaxy Survey ⋆ I. The galaxy sample, Hα narrow-band observations and star formation parameters for 334 galaxies

We discuss the selection and observations of a large sample of nearby galaxies, which we are using to quantify the star formation activity in the local Universe. The sample consists of 334 galaxies…
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A faint type of supernova from a white dwarf with a helium-rich companion

A faint type Ib supernova is reported in the halo of the nearby isolated galaxy, NGC 1032, and it is concluded that it arises from a low-mass, old progenitor, likely to have been a helium-accreting white dwarf in a binary.
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Progenitor mass constraints for core-collapse supernovae from correlations with host galaxy star formation⋆

Using Hemission as a tracer of on-going (<16 Myr old) and near-UV emission as a tracer of recent (16-100 Myr old) star formation, we present constraints on the properties of core- collapse supernova…
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Observational constraints on the progenitor metallicities of core-collapse supernovae★

We present constraints on the progenitor metallicities of core-collapse supernovae. To date, nearly all metallicity constraints have been inferred from indirect methods such as metallicity gradients…
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Ultraviolet tails and trails in cluster galaxies: a sample of candidate gaseous stripping events in Coma

We have used new deep observations of the Coma cluster from GALEX to identify 13 star-forming galaxies with asymmetric morphologies in the ultraviolet. Aided by optical broad-band and H-alpha…
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Hubble Space Telescope studies of low‐redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends

We present an analysis of the maximum light, near-ultraviolet (NUV; 2900 < λ < 5500 A) spectra of 32 low-redshift (0.001 < z < 0.08) Type Ia supernovae (SNe Ia), obtained with the Hubble Space…
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