Dr. Becky | Why is this KILONOVA SPHERICAL (and not donut shaped)?! @DrBecky | Uploaded 1 year ago | Updated 2 days ago
Go to brilliant.org/drbecky to get a 30-day free trial and the first 200 people will get 20% off their annual subscription.
Today we’re chatting about a kilonova (aka a neutron star merger), that’s SPHERICAL. Our simulations & models show us that kilonovae should throw out material in a donut/disk shape. So this doesn’t make any sense to us. Let’s chat about how we know this and what could explain it…
Sneppen et al. (2023; a round kilonova remnant) - arxiv.org/pdf/2302.06621.pdf
Tanvir et al. (2013; suspected kilonova with GRB) - arxiv.org/pdf/1306.4971.pdf
LIGO collaboration (2017; expansion rate measurement with GW170817) - arxiv.org/pdf/1710.05835.pdf
JWST proposal 1936 - https://www.stsci.edu/jwst/phase2-public/1936.pdf
JWST proposal 1984 - https://www.stsci.edu/jwst/phase2-public/1984.pdf
JWST proposal 2091 - https://www.stsci.edu/jwst/phase2-public/2091.pdf
Troja et al. (2022; the last kilonova detected) - arxiv.org/pdf/2209.03363.pdf
My previous videos on the “Crisis in Cosmology”
youtube.com/watch?v=cnn_5YMpo3Q
youtube.com/watch?v=OLL_8ArJIis
youtube.com/watch?v=EqKEev6FD9U
youtube.com/watch?v=Ygq-DK1p17E
JWST has made the crisis in cosmology worse? - youtube.com/watch?v=hps-HfpL1vc
00:00 - Introduction
00:25 - Neutron Stars 101
01:06 - What is a kilonova?
02:08 - The first kilonova: GW170817/AT2017gfo
04:01 - Our models predict kilonova are donut shaped - why?
05:49 - The spectrum published this month - what’s a spectrum?
07:18 - Fitting models of the kilonova shape - it’s SPHERICAL?
09:48 - Ideas for why it’s spherical and not donut shaped
11:19 - What’s next?
11:53 - AD: Brilliant
12:59 - Bloopers
Video filmed on a Sony ⍺7 IV
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📚 My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): http://hyperurl.co/DrBecky
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📚 "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: geni.us/jNcrw
---
👕 My new merch, including JWST designs, are available here (with worldwide shipping!): dr-becky.teemill.com
---
🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive
---
🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
---
👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.
http://drbecky.uk.com
rebeccasmethurst.co.uk
Go to brilliant.org/drbecky to get a 30-day free trial and the first 200 people will get 20% off their annual subscription.
Today we’re chatting about a kilonova (aka a neutron star merger), that’s SPHERICAL. Our simulations & models show us that kilonovae should throw out material in a donut/disk shape. So this doesn’t make any sense to us. Let’s chat about how we know this and what could explain it…
Sneppen et al. (2023; a round kilonova remnant) - arxiv.org/pdf/2302.06621.pdf
Tanvir et al. (2013; suspected kilonova with GRB) - arxiv.org/pdf/1306.4971.pdf
LIGO collaboration (2017; expansion rate measurement with GW170817) - arxiv.org/pdf/1710.05835.pdf
JWST proposal 1936 - https://www.stsci.edu/jwst/phase2-public/1936.pdf
JWST proposal 1984 - https://www.stsci.edu/jwst/phase2-public/1984.pdf
JWST proposal 2091 - https://www.stsci.edu/jwst/phase2-public/2091.pdf
Troja et al. (2022; the last kilonova detected) - arxiv.org/pdf/2209.03363.pdf
My previous videos on the “Crisis in Cosmology”
youtube.com/watch?v=cnn_5YMpo3Q
youtube.com/watch?v=OLL_8ArJIis
youtube.com/watch?v=EqKEev6FD9U
youtube.com/watch?v=Ygq-DK1p17E
JWST has made the crisis in cosmology worse? - youtube.com/watch?v=hps-HfpL1vc
00:00 - Introduction
00:25 - Neutron Stars 101
01:06 - What is a kilonova?
02:08 - The first kilonova: GW170817/AT2017gfo
04:01 - Our models predict kilonova are donut shaped - why?
05:49 - The spectrum published this month - what’s a spectrum?
07:18 - Fitting models of the kilonova shape - it’s SPHERICAL?
09:48 - Ideas for why it’s spherical and not donut shaped
11:19 - What’s next?
11:53 - AD: Brilliant
12:59 - Bloopers
Video filmed on a Sony ⍺7 IV
---
📚 My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): http://hyperurl.co/DrBecky
---
📚 "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: geni.us/jNcrw
---
👕 My new merch, including JWST designs, are available here (with worldwide shipping!): dr-becky.teemill.com
---
🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive
---
🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
---
👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.
http://drbecky.uk.com
rebeccasmethurst.co.uk
