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ASAS-SN request AT2018oh

Posted: Sun Feb 04, 2018 8:11 pm
by Robin Leadbeater
I have had a request for a spectrum of possible supernova AT2018oh/ASAS-SN18bt discovered today (mag 15)
https://wis-tns.weizmann.ac.il/object/2018oh
I am clouded out again tonight but perhaps someone else might like to try.
Below is the email request

Cheers
Robin

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
From: Subo Dong
Sent: Sunday, February 04, 2018 4:32 PM
To: Robin Leadbeater
Cc: Jose Prieto ; Krzysztof (Kris) Stanek
Subject: ASASSN-18bt

Dear Robin,

ASAS-SN has just discovered ASASSN-18bt (2018oh on TNS). It is in the Kepler's K2 field so could be of great interest with high-cadence Kepler observations. Could you please take a spectrum if possible?

https://wis-tns.weizmann.ac.il/object/2018oh


Best,
Subo

Re: ASAS-SN request AT2018oh

Posted: Mon Feb 05, 2018 1:04 am
by Robin Leadbeater
I managed to get 10 mins on it in a break in the clouds. It is a type Ia.
https://wis-tns.weizmann.ac.il/object/2018oh
(spectrum and typical SNID fit below)
It could reach ~mag 14 in the next few days.

Cheers
Robin

Re: ASAS-SN request AT2018oh

Posted: Sat Dec 15, 2018 2:59 pm
by Robin Leadbeater
This supernova which I officially classified spectroscopically on TNS as a type Ia is the subject of a feature on the Sky and Telescope website this week
https://www.skyandtelescope.com/astrono ... -surprise/
(The paper mentioned there cites my classification)
There are other papers comming to press on this SN which add to the debate on what the progenitor systems of type Ia SNe look like ( eg the traditional model of accretion onto a white dwarf from a companion star or a merger of two white dwarfs, an alternative which has been gaining support in recent years)

Robin

Re: ASAS-SN request AT2018oh

Posted: Thu Dec 27, 2018 11:05 pm
by James Foster
On page 19 of https://arxiv.org/pdf/1811.10061.pdf :
"Leadbeater, R. 2018, Transient Name Server Classification Report, 159"

James

Re: ASAS-SN request AT2018oh

Posted: Mon Jul 01, 2019 10:41 pm
by Hamish Barker
Belated congrats robin. Must be quite satisfying!

Re: ASAS-SN request AT2018oh

Posted: Tue Jul 02, 2019 11:29 am
by Robin Leadbeater
Thanks Hamish,

I was invited to give a short talk in the Pro-Am session of the UK National Astronomy Meeting in a couple of days and SN2018oh will get a mention.
https://nam2019.org/thursday/details/23/325
The debate about whether type Ia are caused by accretion or white dwarf mergers is still far from settled though.

Cheers
Robin

Re: ASAS-SN request AT2018oh

Posted: Tue Jul 02, 2019 9:15 pm
by Hamish Barker
I guess ligo isn't sensitive enough to detect white dwarf mergers. ( or would it if inside the milky way?) Otherwise might be a way to settle it.)