The homepage of Giorgos Leloudas

Welcome

 

I am an astronomer studying mainly phenomena of transient nature such as supernovae, tidal disruption events, gamma-ray bursts and gravitational waves. I obtained my PhD at the Dark Cosmology Centre in Copenhagen, under the supervision of Jesper Sollerman. I am originally from Athens, Greece.

 

 

I am now back at DARK, where I work as an assistant professor. Until recently, I was a postdoc at the Experimental Astrophysics group at the Weizmann Institute of Science. In the past, I have also worked at the Oskar Klein Centre, where I was supported by a grant from the Swedish Research Council, and I have also been a Carlsberg fellowl!

 

 

 

News

 

1) Our paper on the extremely peculiar supernova iPTF14hls was just published in Nature! This is a Type II supernova with the exception that it has been going on for more than 600 days having multiple peaks in its light curve! You can check out our press release from the Niels Bohr Institute and an article at Videnskab.dk featuring an interview with Yours Truly! Here is a color image of this supernova that we obtained with the Nordic Optical Telescope. You can also read this nice article in the Quanta Magazine.

 

2) It is official! We have now seen light originating from a gravitational wave source! This amazing discovery truly opens a new era in astrophysics and I am very lucky and privileged to have participated in this! Our paper studying the properties of the kilonova following the merger of two neutron stars was published in Nature. Clearly, this is a unique event and it does not resemble any other previously known transient, such as a supernova.

 

This remarkable discovery was announced just a couple of weeks after the Nobel prize award for the discovery of gravitational waves two years earlier and it surely made a big splash! Here are links with more information from LIGO, ESO, and our own Niels Bohr Institute! The image to the left was produced by ESO and shows the inspiral and merging of two neutron stars, producing gravitational waves.

 

 

Older news

 

1) Our paper on the polarimetry of the superluminous SN 2015bn has been accepted by ApJ Letters. Check it out! Here, we demonstrate that the fraction of polarised light from the supernova increased with time and that this was simultaneous with changes that were observed in its optical spectrum. We further suggest that SN 2015bn, and possibly more (or even all) superluminous supernovae, consist of two layers with different geometry and chemical composition.

 

2) Our paper on the extremely luminous transient ASASSN-15lh was published by Nature Astronomy! In this work, we propose that, instead of a superluminous supernova, ASASSN-15lh was the result of a tidal disruption event by a rapidly spinning supermassive black hole.

 

To the right, you can see an artist's impression of this phenomenon: a low-mass star is approaching a supermassive black hole, with a mass greater than 100 million times the mass of the Sun, and it is being disrupted by its gravitational field. The gravity from the black hole bends the light from the stars and gas behind it. The black hole appears oblate due to its fast rotation.

(Credit: ESO, ESA/Hubble, M. Kornmesser)

 

You can find the relevant press releases here:

ESO, ESA/Hubble

 

More press releases from participating institutions:

DARK, QUB, LCOGT, ICRAR, SRON, Stockholm, Turku, INAF

 

And some press coverage:

Science, The Guardian, BBC, The Sydney Morning Herald, El Pais, Die Welt, To Vima,

Videnskab.dk, Space.com, Astronomy magazine, Scientific American

 

 

 

 

 

 

 

 

 

 

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