Author correction: outflows from the youngest stars are mostly molecular

Correction to: Nature https://doi.org/10.1038/s41586-023-06551-1 Published online 24 August 2023Interstellar matter and star formatio

JOYS: Disentangling the warm and cold material in the high-mass IRAS 23385+6053 cluster

Interstellar matter and star formatio

The mid-infrared instrument for the James Webb space telescope, II: design and build

Instrumentatio

Laboratory astrophysics of cosmic dust analogues

In this chapter, the main techniques for producing and characterizing cosmic dust analogues in the laboratory will be discussed. It will be shown how optical data of astronomically relevant materials can be measured and how such data can be applied to interpret astronomical spectra. The identification of minerals in space from infrared spectroscopy will be summarized

Antioxidant, tyrosinase inhibitory, and acetylcholinesterase inhibitory activities of green tea (Camellia sinensis L.) seed and its pericarp

10.1007/s10068-012-0099-9Food Science and Biotechnology213761-76

JWST MIRI Imager Observations of Supernova SN 1987A

International audienceThere exist very few mid-infrared (IR) observations of supernovae (SNe) in general. Therefore, SN 1987A, the closest visible SN in 400 years, gives us the opportunity to explore the mid-IR properties of SNe, the dust in their ejecta and surrounding medium, and to witness the birth of a SN remnant (SNR). The James Webb Space Telescope (JWST), with its high spatial resolution and extreme sensitivity, gives a new view on these issues. We report on the first imaging observations obtained with the Mid-InfraRed Instrument (MIRI). We build temperature maps and discuss the morphology of the nascent SNR. Our results show that the temperatures in the equatorial ring (ER) are quite non-uniform. This could be due to dust destruction in some parts of the ring, as had been assumed in some previous works. We show that the IR emission extends beyond the ER, illustrating the fact that the shock wave has now passed through this ring to affect the circumstellar medium on a larger scale. Finally, while sub-mm Atacama Large Millimeter Array (ALMA) observations have hinted at the location of the compact remnant of SN 1987A, we note that our MIRI data have found no such evidence

Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS

International audienceSupernova (SN) 1987A is the nearest supernova in ∼400 yr. Using the JWST MIRI Medium Resolution Spectrograph, we spatially resolved the ejecta, equatorial ring (ER), and outer rings in the mid-infrared 12,927 days (35.4 yr) after the explosion. The spectra are rich in line and dust continuum emission, both in the ejecta and the ring. The broad emission lines (280–380 km s$^{−1}$ FWHM) that are seen from all singly-ionized species originate from the expanding ER, with properties consistent with dense post-shock cooling gas. Narrower emission lines (100–170 km s$^{−1}$ FWHM) are seen from species originating from a more extended lower-density component whose high ionization may have been produced by shocks progressing through the ER or by the UV radiation pulse associated with the original supernova event. The asymmetric east–west dust emission in the ER has continued to fade, with constant temperature, signifying a reduction in dust mass. Small grains in the ER are preferentially destroyed, with larger grains from the progenitor surviving the transition from SN into SNR. The ER dust is fit with a single set of optical constants, eliminating the need for a secondary featureless hot dust component. We find several broad ejecta emission lines from [Ne ii], [Ar ii], [Fe ii], and [Ni ii]. With the exception of [Fe ii] 25.99 μm, these all originate from the ejecta close to the ring and are likely to be excited by X-rays from the interaction. The [Fe ii] 5.34 to 25.99 μm line ratio indicates a temperature of only a few hundred K in the inner core, which is consistent with being powered by $^{44}$ Ti decay