Hubble: First Multiple Images of Explosive Distance Indicator

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Hubble: First Multiple Images of Explosive Distance Indicator

Post by bystander » Thu Apr 20, 2017 8:21 pm

Hubble Observes First Multiple Images of Explosive Distance Indicator
ESA Hubble Science Release | 2017 Apr 20

Lensed supernova will give insight into the expansion of the Universe
[img3="Credit: ESA/Hubble, NASA, Sloan Digital Sky Survey, Palomar Observatory/California Institute of Technology"] ... c1710a.jpg[/img3][hr][/hr]
A Swedish-led team of astronomers used the NASA/ESA Hubble Space Telescope to analyse the multiple images of a gravitationally lensed type Ia supernova for the first time. The four images of the exploding star will be used to measure the expansion of the Universe. This can be done without any theoretical assumptions about the cosmological model, giving further clues about how fast the Universe is really expanding. The results are published in the journal Science.

An international team, led by astronomers from the Stockholm University, Sweden, has discovered a distant type Ia supernova, called iPTF16geu [1] — it took the light 4.3 billion years to travel to Earth [2]. The light from this particular supernova was bent and magnified by the effect of gravitational lensing so that it was split into four separate images on the sky [3]. The four images lie on a circle with a radius of only about 3000 light-years around the lensing foreground galaxy, making it one of the smallest extragalactic gravitational lenses discovered so far. Its appearance resembles the famous Refsdal supernova, which astronomers detected in 2015 (heic1525). Refsdal, however, was a core-collapse supernova.

Type Ia supernovae always have the same intrinsic brightness, so by measuring how bright they appear astronomers can determine how far away they are. They are therefore known as standard candles. These supernovae have been used for decades to measure distances across the Universe, and were also used to discover its accelerated expansion and infer the existence of dark energy. Now the supernova iPTF16geu allows scientists to explore new territory, testing the theories of the warping of spacetime on smaller extragalactic scales than ever before. ...

Rare Brightening of a Supernova's Light found by Palomar Observatory
California Institute of Technology | 2017 Apr 20

Rare Supernova Discovery Ushers in New Era for Cosmology
Lawrence Berkeley National Laboratory | 2017 Apr 20

Rare High-Resolution Images of Exploded Star
W.M. Keck Observatory | 2017 Apr 21

iPTF16geu: A Multiply Imaged, Gravitationally Lensed Type Ia Supernova - A. Goobar et al
Last edited by bystander on Fri Apr 21, 2017 7:56 pm, edited 1 time in total.
Reason: Add WM Keck article
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Re: Hubble: First Multiple Images of Explosive Distance Indicator

Post by Ann » Thu Apr 20, 2017 9:52 pm

ESA/HEIC wrote:
Currently the team is in the process of accurately measuring how long it took for the light to reach us from each of the four images of the supernova. The differences in the times of arrival can then be used to calculate the Hubble constant — the expansion rate of the Universe — with high precision [4]. This is particularly crucial in light of the recent discrepancy between the measurements of its value in the local and the early Universe (heic1702).
I'm eagerly awaiting the result!

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